InputMethodService
public
class
InputMethodService
extends AbstractInputMethodService
java.lang.Object | |||||
↳ | android.content.Context | ||||
↳ | android.content.ContextWrapper | ||||
↳ | android.app.Service | ||||
↳ | android.inputmethodservice.AbstractInputMethodService | ||||
↳ | android.inputmethodservice.InputMethodService |
InputMethodService provides a standard implementation of an InputMethod,
which final implementations can derive from and customize. See the
base class AbstractInputMethodService
and the InputMethod
interface for more information on the basics of writing input methods.
In addition to the normal Service lifecycle methods, this class introduces some new specific callbacks that most subclasses will want to make use of:
-
onInitializeInterface()
for user-interface initialization, in particular to deal with configuration changes while the service is running. -
onBindInput()
to find out about switching to a new client. -
onStartInput(EditorInfo, boolean)
to deal with an input session starting with the client. -
onCreateInputView()
,onCreateCandidatesView()
, andonCreateExtractTextView()
for non-demand generation of the UI. -
onStartInputView(android.view.inputmethod.EditorInfo, boolean)
to deal with input starting within the input area of the IME.
An input method has significant discretion in how it goes about its
work: the InputMethodService
provides
a basic framework for standard UI elements (input view, candidates view,
and running in fullscreen mode), but it is up to a particular implementor
to decide how to use them. For example, one input method could implement
an input area with a keyboard, another could allow the user to draw text,
while a third could have no input area (and thus not be visible to the
user) but instead listen to audio and perform text to speech conversion.
In the implementation provided here, all of these elements are placed together in a single window managed by the InputMethodService. It will execute callbacks as it needs information about them, and provides APIs for programmatic control over them. They layout of these elements is explicitly defined:
- The soft input view, if available, is placed at the bottom of the screen.
- The candidates view, if currently shown, is placed above the soft input view.
- If not running fullscreen, the application is moved or resized to be above these views; if running fullscreen, the window will completely cover the application and its top part will contain the extract text of what is currently being edited by the application.
Soft Input View
Central to most input methods is the soft input view. This is where most
user interaction occurs: pressing on soft keys, drawing characters, or
however else your input method wants to generate text. Most implementations
will simply have their own view doing all of this work, and return a new
instance of it when onCreateInputView()
is called. At that point,
as long as the input view is visible, you will see user interaction in
that view and can call back on the InputMethodService to interact with the
application as appropriate.
There are some situations where you want to decide whether or not your
soft input view should be shown to the user. This is done by implementing
the onEvaluateInputViewShown()
to return true or false based on
whether it should be shown in the current environment. If any of your
state has changed that may impact this, call
updateInputViewShown()
to have it re-evaluated. The default
implementation always shows the input view unless there is a hard
keyboard available, which is the appropriate behavior for most input
methods.
Candidates View
Often while the user is generating raw text, an input method wants to
provide them with a list of possible interpretations of that text that can
be selected for use. This is accomplished with the candidates view, and
like the soft input view you implement onCreateCandidatesView()
to instantiate your own view implementing your candidates UI.
Management of the candidates view is a little different than the input
view, because the candidates view tends to be more transient, being shown
only when there are possible candidates for the current text being entered
by the user. To control whether the candidates view is shown, you use
setCandidatesViewShown(boolean)
. Note that because the candidate
view tends to be shown and hidden a lot, it does not impact the application
UI in the same way as the soft input view: it will never cause application
windows to resize, only cause them to be panned if needed for the user to
see the current focus.
Fullscreen Mode
Sometimes your input method UI is too large to integrate with the application UI, so you just want to take over the screen. This is accomplished by switching to full-screen mode, causing the input method window to fill the entire screen and add its own "extracted text" editor showing the user the text that is being typed. Unlike the other UI elements, there is a standard implementation for the extract editor that you should not need to change. The editor is placed at the top of the IME, above the input and candidates views.
Similar to the input view, you control whether the IME is running in
fullscreen mode by implementing onEvaluateFullscreenMode()
to return true or false based on
whether it should be fullscreen in the current environment. If any of your
state has changed that may impact this, call
updateFullscreenMode()
to have it re-evaluated. The default
implementation selects fullscreen mode when the screen is in a landscape
orientation, which is appropriate behavior for most input methods that have
a significant input area.
When in fullscreen mode, you have some special requirements because the
user can not see the application UI. In particular, you should implement
onDisplayCompletions(android.view.inputmethod.CompletionInfo[])
to show completions
generated by your application, typically in your candidates view like you
would normally show candidates.
Generating Text
The key part of an IME is of course generating text for the application.
This is done through calls to the
InputConnection
interface to the
application, which can be retrieved from getCurrentInputConnection()
.
This interface allows you to generate raw key events or, if the target
supports it, directly edit in strings of candidates and committed text.
Information about what the target is expected and supports can be found
through the EditorInfo
class, which is
retrieved with getCurrentInputEditorInfo()
method. The most
important part of this is EditorInfo.inputType
; in particular, if this is
EditorInfo.TYPE_NULL
,
then the target does not support complex edits and you need to only deliver
raw key events to it. An input method will also want to look at other
values here, to for example detect password mode, auto complete text views,
phone number entry, etc.
When the user switches between input targets, you will receive calls to
onFinishInput()
and onStartInput(android.view.inputmethod.EditorInfo, boolean)
.
You can use these to reset and initialize your input state for the current
target. For example, you will often want to clear any input state, and
update a soft keyboard to be appropriate for the new inputType.
Summary
Nested classes | |
---|---|
class |
InputMethodService.InputMethodImpl
Concrete implementation of
|
class |
InputMethodService.InputMethodSessionImpl
Concrete implementation of
|
class |
InputMethodService.Insets
Information about where interesting parts of the input method UI appear. |
XML attributes | |
---|---|
android:imeExtractEnterAnimation |
Animation to use when showing the fullscreen extract UI after it had previously been hidden. |
android:imeExtractExitAnimation |
Animation to use when hiding the fullscreen extract UI after it had previously been shown. |
android:imeFullscreenBackground |
Background to use for entire input method when it is being shown in fullscreen mode with the extract view, to ensure that it completely covers the application. |
Constants | |
---|---|
int |
BACK_DISPOSITION_ADJUST_NOTHING
Asks the system to not adjust the back button affordance even when the software keyboard is shown. |
int |
BACK_DISPOSITION_DEFAULT
Allows the system to optimize the back button affordance based on the presence of software keyboard. |
int |
BACK_DISPOSITION_WILL_DISMISS
This constant was deprecated
in API level 28.
on |
int |
BACK_DISPOSITION_WILL_NOT_DISMISS
This constant was deprecated
in API level 28.
on |
Inherited constants |
---|
Public constructors | |
---|---|
InputMethodService()
|
Public methods | |
---|---|
boolean
|
enableHardwareAcceleration()
This method was deprecated in API level 21. Starting in API 21, hardware acceleration is always enabled on capable devices |
final
void
|
finishConnectionlessStylusHandwriting(CharSequence text)
Finishes the current connectionless stylus handwriting session and delivers the result. |
final
void
|
finishStylusHandwriting()
Finish the current stylus handwriting session. |
int
|
getBackDisposition()
Retrieves the current disposition mode that indicates the expected back button affordance. |
int
|
getCandidatesHiddenVisibility()
Returns the visibility mode (either |
InputBinding
|
getCurrentInputBinding()
Return the currently active InputBinding for the input method, or null if there is none. |
InputConnection
|
getCurrentInputConnection()
Retrieve the currently active InputConnection that is bound to the input method, or null if there is none. |
EditorInfo
|
getCurrentInputEditorInfo()
|
boolean
|
getCurrentInputStarted()
|
int
|
getInputMethodWindowRecommendedHeight()
This method was deprecated in API level 29. the actual behavior of this method has never been well defined. You cannot use this method in a reliable and predictable way |
LayoutInflater
|
getLayoutInflater()
|
int
|
getMaxWidth()
Return the maximum width, in pixels, available the input method. |
static
final
Duration
|
getStylusHandwritingIdleTimeoutMax()
Returns the maximum stylus handwriting session idle-timeout for use with
|
final
Duration
|
getStylusHandwritingSessionTimeout()
Returns the duration after which an ongoing stylus handwriting session that hasn't received
new |
final
Window
|
getStylusHandwritingWindow()
Returns the stylus handwriting inking window. |
Object
|
getSystemService(String name)
Return the handle to a system-level service by name. |
CharSequence
|
getTextForImeAction(int imeOptions)
Return text that can be used as a button label for the given
|
Dialog
|
getWindow()
|
void
|
hideStatusIcon()
|
void
|
hideWindow()
|
boolean
|
isExtractViewShown()
Return whether the fullscreen extract view is shown. |
boolean
|
isFullscreenMode()
Return whether the input method is currently running in fullscreen mode. |
boolean
|
isInputViewShown()
Return whether the soft input view is currently shown to the user. |
boolean
|
isShowInputRequested()
Returns true if we have been asked to show our input view. |
void
|
onAppPrivateCommand(String action, Bundle data)
Not implemented in this class. |
void
|
onBindInput()
Called when a new client has bound to the input method. |
void
|
onComputeInsets(InputMethodService.Insets outInsets)
Compute the interesting insets into your UI. |
void
|
onConfigurationChanged(Configuration newConfig)
Take care of handling configuration changes. |
void
|
onConfigureWindow(Window win, boolean isFullscreen, boolean isCandidatesOnly)
Update the given window's parameters for the given mode. |
void
|
onCreate()
Called by the system when the service is first created. |
View
|
onCreateCandidatesView()
Create and return the view hierarchy used to show candidates. |
View
|
onCreateExtractTextView()
Called by the framework to create the layout for showing extracted text. |
InlineSuggestionsRequest
|
onCreateInlineSuggestionsRequest(Bundle uiExtras)
Called when Autofill is requesting an |
AbstractInputMethodService.AbstractInputMethodImpl
|
onCreateInputMethodInterface()
This method is deprecated.
Overriding or calling this method is strongly discouraged. A future version of
Android will remove the ability to use this method. Use the callbacks on
|
AbstractInputMethodService.AbstractInputMethodSessionImpl
|
onCreateInputMethodSessionInterface()
This method is deprecated.
Overriding or calling this method is strongly discouraged.
Most methods in |
View
|
onCreateInputView()
Create and return the view hierarchy used for the input area (such as a soft keyboard). |
void
|
onCustomImeSwitcherButtonRequestedVisible(boolean visible)
Called when the requested visibility of a custom IME Switcher button changes. |
void
|
onDestroy()
Called by the system to notify a Service that it is no longer used and is being removed. If you override this method you must call through to the superclass implementation. |
void
|
onDisplayCompletions(CompletionInfo[] completions)
Called when the application has reported auto-completion candidates that it would like to have the input method displayed. |
boolean
|
onEvaluateFullscreenMode()
Override this to control when the input method should run in fullscreen mode. |
boolean
|
onEvaluateInputViewShown()
Override this to control when the soft input area should be shown to the user. |
boolean
|
onExtractTextContextMenuItem(int id)
This is called when the user has selected a context menu item from the extracted text view, when running in fullscreen mode. |
void
|
onExtractedCursorMovement(int dx, int dy)
This is called when the user has performed a cursor movement in the extracted text view, when it is running in fullscreen mode. |
void
|
onExtractedSelectionChanged(int start, int end)
This is called when the user has moved the cursor in the extracted text view, when running in fullsreen mode. |
void
|
onExtractedTextClicked()
This is called when the user has clicked on the extracted text view, when running in fullscreen mode. |
void
|
onExtractingInputChanged(EditorInfo ei)
This is called when, while currently displayed in extract mode, the current input target changes. |
void
|
onFinishCandidatesView(boolean finishingInput)
Called when the candidates view is being hidden from the user. |
void
|
onFinishInput()
Called to inform the input method that text input has finished in the last editor. |
void
|
onFinishInputView(boolean finishingInput)
Called when the input view is being hidden from the user. |
void
|
onFinishStylusHandwriting()
Called when the current stylus handwriting session was finished (either by the system or
via |
boolean
|
onGenericMotionEvent(MotionEvent event)
Override this to intercept generic motion events before they are processed by the application. |
void
|
onInitializeInterface()
This is a hook that subclasses can use to perform initialization of their interface. |
boolean
|
onInlineSuggestionsResponse(InlineSuggestionsResponse response)
Called when Autofill responds back with |
boolean
|
onKeyDown(int keyCode, KeyEvent event)
Called back when a |
boolean
|
onKeyLongPress(int keyCode, KeyEvent event)
Default implementation of |
boolean
|
onKeyMultiple(int keyCode, int count, KeyEvent event)
Override this to intercept special key multiple events before they are processed by the application. |
boolean
|
onKeyUp(int keyCode, KeyEvent event)
Override this to intercept key up events before they are processed by the application. |
void
|
onPrepareStylusHandwriting()
Called to prepare stylus handwriting. |
boolean
|
onShowInputRequested(int flags, boolean configChange)
The system has decided that it may be time to show your input method. |
void
|
onStartCandidatesView(EditorInfo editorInfo, boolean restarting)
Called when only the candidates view has been shown for showing processing as the user enters text through a hard keyboard. |
boolean
|
onStartConnectionlessStylusHandwriting(int inputType, CursorAnchorInfo cursorAnchorInfo)
Called when an app requests to start a connectionless stylus handwriting session using one of
|
void
|
onStartInput(EditorInfo attribute, boolean restarting)
Called to inform the input method that text input has started in an editor. |
void
|
onStartInputView(EditorInfo editorInfo, boolean restarting)
Called when the input view is being shown and input has started on a new editor. |
boolean
|
onStartStylusHandwriting()
Called when an app requests stylus handwriting
|
void
|
onStylusHandwritingMotionEvent(MotionEvent motionEvent)
Called after |
boolean
|
onTrackballEvent(MotionEvent event)
Override this to intercept trackball motion events before they are processed by the application. |
void
|
onUnbindInput()
Called when the previous bound client is no longer associated with the input method. |
void
|
onUpdateCursor(Rect newCursor)
This method was deprecated
in API level 21.
Use |
void
|
onUpdateCursorAnchorInfo(CursorAnchorInfo cursorAnchorInfo)
Called when the application has reported a new location of its text insertion point and characters in the composition string. |
void
|
onUpdateEditorToolType(int toolType)
Called when the user tapped or clicked an editor. |
void
|
onUpdateExtractedText(int token, ExtractedText text)
Called when the application has reported new extracted text to be shown due to changes in its current text state. |
void
|
onUpdateExtractingViews(EditorInfo ei)
Called when the fullscreen-mode extracting editor info has changed, to update the state of its UI such as the action buttons shown. |
void
|
onUpdateExtractingVisibility(EditorInfo ei)
Called when the fullscreen-mode extracting editor info has changed, to determine whether the extracting (extract text and candidates) portion of the UI should be shown. |
void
|
onUpdateSelection(int oldSelStart, int oldSelEnd, int newSelStart, int newSelEnd, int candidatesStart, int candidatesEnd)
Called when the application has reported a new selection region of the text. |
void
|
onViewClicked(boolean focusChanged)
This method was deprecated
in API level 29.
The method may not be called for composite |
void
|
onWindowHidden()
Called when the input method window has been hidden from the user, after previously being visible. |
void
|
onWindowShown()
Called immediately before the input method window is shown to the user. |
void
|
requestHideSelf(int flags)
Close this input method's soft input area, removing it from the display. |
final
void
|
requestShowSelf(int flags)
Show the input method's soft input area, so the user sees the input method window and can interact with it. |
boolean
|
sendDefaultEditorAction(boolean fromEnterKey)
Ask the input target to execute its default action via
|
void
|
sendDownUpKeyEvents(int keyEventCode)
Send the given key event code (as defined by |
void
|
sendKeyChar(char charCode)
Send the given UTF-16 character to the current input connection. |
void
|
setBackDisposition(int disposition)
Sets the disposition mode that indicates the expected affordance for the back button. |
void
|
setCandidatesView(View view)
Replaces the current candidates view with a new one. |
void
|
setCandidatesViewShown(boolean shown)
Controls the visibility of the candidates display area. |
void
|
setExtractView(View view)
|
void
|
setExtractViewShown(boolean shown)
Controls the visibility of the extracted text area. |
void
|
setInputView(View view)
Replaces the current input view with a new one. |
final
void
|
setStylusHandwritingSessionTimeout(Duration duration)
Sets the duration after which an ongoing stylus handwriting session that hasn't received new
|
void
|
setTheme(int theme)
You can call this to customize the theme used by your IME's window. |
final
boolean
|
shouldOfferSwitchingToNextInputMethod()
Returns true if the current IME needs to offer the users ways to switch to a next input method (e.g. a globe key.). |
void
|
showStatusIcon(int iconResId)
|
void
|
showWindow(boolean showInput)
|
void
|
switchInputMethod(String id)
Force switch to a new input method, as identified by id. |
final
void
|
switchInputMethod(String id, InputMethodSubtype subtype)
Force switch to a new input method, as identified by |
final
boolean
|
switchToNextInputMethod(boolean onlyCurrentIme)
Force switch to the next input method and subtype. |
final
boolean
|
switchToPreviousInputMethod()
Force switch to the last used input method and subtype. |
void
|
updateFullscreenMode()
Re-evaluate whether the input method should be running in fullscreen mode, and update its UI if this has changed since the last time it was evaluated. |
void
|
updateInputViewShown()
Re-evaluate whether the soft input area should currently be shown, and update its UI if this has changed since the last time it was evaluated. |
Protected methods | |
---|---|
void
|
dump(FileDescriptor fd, PrintWriter fout, String[] args)
Performs a dump of the InputMethodService's internal state. |
void
|
onCurrentInputMethodSubtypeChanged(InputMethodSubtype newSubtype)
Called when the subtype was changed. |
Inherited methods | |
---|---|
XML attributes
android:imeExtractEnterAnimation
Animation to use when showing the fullscreen extract UI after it had previously been hidden.
May be a reference to another resource, in the form
"@[+][package:]type/name
" or a theme
attribute in the form
"?[package:]type/name
".
android:imeExtractExitAnimation
Animation to use when hiding the fullscreen extract UI after it had previously been shown.
May be a reference to another resource, in the form
"@[+][package:]type/name
" or a theme
attribute in the form
"?[package:]type/name
".
android:imeFullscreenBackground
Background to use for entire input method when it is being shown in fullscreen mode with the extract view, to ensure that it completely covers the application. This allows, for example, the candidate view to be hidden while in fullscreen mode without having the application show through behind it.
May be a reference to another resource, in the form
"@[+][package:]type/name
" or a theme
attribute in the form
"?[package:]type/name
".
May be a color value, in the form of "#rgb
",
"#argb
", "#rrggbb
", or
"#aarrggbb
".
Constants
BACK_DISPOSITION_ADJUST_NOTHING
public static final int BACK_DISPOSITION_ADJUST_NOTHING
Asks the system to not adjust the back button affordance even when the software keyboard is shown.
This mode is useful for UI modes where IME's main soft input window is used for some
supplemental UI, such as floating candidate window for languages such as Chinese and
Japanese, where users expect the back button is, or at least looks to be, handled by the
target application rather than the UI shown by the IME even while isInputViewShown()
returns true
.
Note that KeyEvent.KEYCODE_BACK
events continue to be sent to
onKeyDown(int, android.view.KeyEvent)
even when this mode is specified. The default
implementation of onKeyDown(int, android.view.KeyEvent)
for KeyEvent.KEYCODE_BACK
does
not take this mode into account.
See also:
Constant Value: 3 (0x00000003)
BACK_DISPOSITION_DEFAULT
public static final int BACK_DISPOSITION_DEFAULT
Allows the system to optimize the back button affordance based on the presence of software keyboard.
For instance, on devices that have navigation bar and software-rendered back button, the
system may use a different icon while isInputViewShown()
returns true
, to
indicate that the back button has "dismiss" affordance.
Note that KeyEvent.KEYCODE_BACK
events continue to be sent to
onKeyDown(int, android.view.KeyEvent)
even when this mode is specified. The default
implementation of onKeyDown(int, android.view.KeyEvent)
for KeyEvent.KEYCODE_BACK
does
not take this mode into account.
For API level Build.VERSION_CODES.O_MR1
and lower devices, this is the
only mode you can safely specify without worrying about the compatibility.
See also:
Constant Value: 0 (0x00000000)
BACK_DISPOSITION_WILL_DISMISS
public static final int BACK_DISPOSITION_WILL_DISMISS
This constant was deprecated
in API level 28.
on Build.VERSION_CODES.P
and later devices, this flag is
handled as a synonym of BACK_DISPOSITION_DEFAULT
. On
Build.VERSION_CODES.O_MR1
and prior devices, expected behavior
of this mode had not been well defined. In AOSP implementation running on devices
that have navigation bar, specifying this flag could change the software back
button to "Dismiss" icon no matter whether the software keyboard is shown or not,
but there would be no easy way to restore the icon state even after IME lost the
connection to the application. To avoid user confusions, do not specify this mode
anyway
Deprecated flag.
To avoid compatibility issues, IME developers should not use this flag.
See also:
Constant Value: 2 (0x00000002)
BACK_DISPOSITION_WILL_NOT_DISMISS
public static final int BACK_DISPOSITION_WILL_NOT_DISMISS
This constant was deprecated
in API level 28.
on Build.VERSION_CODES.P
and later devices, this flag is
handled as a synonym of BACK_DISPOSITION_DEFAULT
. On
Build.VERSION_CODES.O_MR1
and prior devices, expected behavior
of this mode had not been well defined. Most likely the end result would be the
same as BACK_DISPOSITION_DEFAULT
. Either way it is not recommended to
use this mode
Deprecated flag.
To avoid compatibility issues, IME developers should not use this flag.
See also:
Constant Value: 1 (0x00000001)
Public constructors
InputMethodService
public InputMethodService ()
Public methods
enableHardwareAcceleration
public boolean enableHardwareAcceleration ()
This method was deprecated
in API level 21.
Starting in API 21, hardware acceleration is always enabled on capable devices
You can call this to try to enable accelerated drawing for your IME. This must be set before
onCreate()
, so you will typically call it in your constructor. It is not always
possible to use hardware accelerated drawing in an IME (for example on low-end devices that
do not have the resources to support this), so the call true
if it succeeds otherwise
false
if you will need to draw in software. You must be able to handle either case.
In API 21 and later, system may automatically enable hardware accelerated drawing for your IME on capable devices even if this method is not explicitly called. Make sure that your IME is able to handle either case.
Returns | |
---|---|
boolean |
true if accelerated drawing is successfully enabled otherwise false .
On API 21 and later devices the return value is basically just a hint and your IME
does not need to change the behavior based on the it |
finishConnectionlessStylusHandwriting
public final void finishConnectionlessStylusHandwriting (CharSequence text)
Finishes the current connectionless stylus handwriting session and delivers the result.
This dismisses the ink window
and stops intercepting
stylus MotionEvent
s.
Note for IME developers: Call this method at any time to finish the current handwriting
session. Generally, this should be invoked after a short timeout, giving the user enough time
to start the next stylus stroke, if any. By default, system will time-out after few seconds.
To override default timeout, use setStylusHandwritingSessionTimeout(java.time.Duration)
.
Parameters | |
---|---|
text |
CharSequence : This value may be null . |
finishStylusHandwriting
public final void finishStylusHandwriting ()
Finish the current stylus handwriting session.
This dismisses the ink window
and stops intercepting
stylus MotionEvent
s.
Connectionless handwriting sessions should be finished using finishConnectionlessStylusHandwriting(java.lang.CharSequence)
.
Note for IME developers: Call this method at any time to finish the current handwriting
session. Generally, this should be invoked after a short timeout, giving the user enough time
to start the next stylus stroke, if any. By default, system will time-out after few seconds.
To override default timeout, use setStylusHandwritingSessionTimeout(java.time.Duration)
.
Handwriting session will be finished by framework on next onFinishInput()
.
getBackDisposition
public int getBackDisposition ()
Retrieves the current disposition mode that indicates the expected back button affordance.
Returns | |
---|---|
int |
currently selected disposition mode
Value is BACK_DISPOSITION_DEFAULT , BACK_DISPOSITION_WILL_NOT_DISMISS , BACK_DISPOSITION_WILL_DISMISS , or BACK_DISPOSITION_ADJUST_NOTHING |
See also:
getCandidatesHiddenVisibility
public int getCandidatesHiddenVisibility ()
Returns the visibility mode (either View.INVISIBLE
or View.GONE
) of the candidates view when it is not
shown. The default implementation returns GONE when
isExtractViewShown()
returns true,
otherwise INVISIBLE. Be careful if you change this to return GONE in
other situations -- if showing or hiding the candidates view causes
your window to resize, this can cause temporary drawing artifacts as
the resize takes place.
Returns | |
---|---|
int |
getCurrentInputBinding
public InputBinding getCurrentInputBinding ()
Return the currently active InputBinding for the input method, or null if there is none.
Returns | |
---|---|
InputBinding |
getCurrentInputConnection
public InputConnection getCurrentInputConnection ()
Retrieve the currently active InputConnection that is bound to the input method, or null if there is none.
Returns | |
---|---|
InputConnection |
getCurrentInputEditorInfo
public EditorInfo getCurrentInputEditorInfo ()
Returns | |
---|---|
EditorInfo |
getCurrentInputStarted
public boolean getCurrentInputStarted ()
Returns | |
---|---|
boolean |
getInputMethodWindowRecommendedHeight
public int getInputMethodWindowRecommendedHeight ()
This method was deprecated
in API level 29.
the actual behavior of this method has never been well defined. You cannot use
this method in a reliable and predictable way
Aimed to return the previous input method's Insets.contentTopInsets
, but its actual
semantics has never been well defined.
Note that the previous document clearly mentioned that this method could return 0
at any time for whatever reason. Now this method is just always returning 0
.
Returns | |
---|---|
int |
on Android Build.VERSION_CODES.Q and later devices this method
always returns 0 |
getLayoutInflater
public LayoutInflater getLayoutInflater ()
Returns | |
---|---|
LayoutInflater |
getMaxWidth
public int getMaxWidth ()
Return the maximum width, in pixels, available the input method. Input methods are positioned at the bottom of the screen and, unless running in fullscreen, will generally want to be as short as possible so should compute their height based on their contents. However, they can stretch as much as needed horizontally. The function returns to you the maximum amount of space available horizontally, which you can use if needed for UI placement.
In many cases this is not needed, you can just rely on the normal view layout mechanisms to position your views within the full horizontal space given to the input method.
Note that this value can change dynamically, in particular when the screen orientation changes.
Returns | |
---|---|
int |
getStylusHandwritingIdleTimeoutMax
public static final Duration getStylusHandwritingIdleTimeoutMax ()
Returns the maximum stylus handwriting session idle-timeout for use with
setStylusHandwritingSessionTimeout(java.time.Duration)
.
Returns | |
---|---|
Duration |
This value cannot be null . |
getStylusHandwritingSessionTimeout
public final Duration getStylusHandwritingSessionTimeout ()
Returns the duration after which an ongoing stylus handwriting session that hasn't received
new MotionEvent
s will time out and finishStylusHandwriting()
will be called.
The current timeout can be changed using
setStylusHandwritingSessionTimeout(java.time.Duration)
.
Returns | |
---|---|
Duration |
This value cannot be null . |
getStylusHandwritingWindow
public final Window getStylusHandwritingWindow ()
Returns the stylus handwriting inking window.
IMEs supporting stylus input are expected to attach their inking views to this
window (e.g. with Window.setContentView(View)
)). Handwriting-related
MotionEvent
s are dispatched to the attached view hierarchy.
Note: This returns null
if IME doesn't support stylus handwriting
i.e. if InputMethodInfo.supportsStylusHandwriting()
is false.
This method should be called after onStartStylusHandwriting()
.
Returns | |
---|---|
Window |
See also:
getSystemService
public Object getSystemService (String name)
Return the handle to a system-level service by name. The class of the returned object varies by the requested name. Currently available names are:
-
WINDOW_SERVICE
("window") - The top-level window manager in which you can place custom
windows. The returned object is a
WindowManager
. Must only be obtained from a visual context such as Activity or a Context created withcreateWindowContext(int, android.os.Bundle)
, which are adjusted to the configuration and visual bounds of an area on screen. -
LAYOUT_INFLATER_SERVICE
("layout_inflater") - A
LayoutInflater
for inflating layout resources in this context. Must only be obtained from a visual context such as Activity or a Context created withcreateWindowContext(int, android.os.Bundle)
, which are adjusted to the configuration and visual bounds of an area on screen. -
ACTIVITY_SERVICE
("activity") - A
ActivityManager
for interacting with the global activity state of the system. -
WALLPAPER_SERVICE
("wallpaper") - A
WallpaperService
for accessing wallpapers in this context. Must only be obtained from a visual context such as Activity or a Context created withcreateWindowContext(int, android.os.Bundle)
, which are adjusted to the configuration and visual bounds of an area on screen. -
POWER_SERVICE
("power") - A
PowerManager
for controlling power management. -
ALARM_SERVICE
("alarm") - A
AlarmManager
for receiving intents at the time of your choosing. -
NOTIFICATION_SERVICE
("notification") - A
NotificationManager
for informing the user of background events. -
KEYGUARD_SERVICE
("keyguard") - A
KeyguardManager
for controlling keyguard. -
LOCATION_SERVICE
("location") - A
LocationManager
for controlling location (e.g., GPS) updates. -
SEARCH_SERVICE
("search") - A
SearchManager
for handling search. -
VIBRATOR_MANAGER_SERVICE
("vibrator_manager") - A
VibratorManager
for accessing the device vibrators, interacting with individual ones and playing synchronized effects on multiple vibrators. -
VIBRATOR_SERVICE
("vibrator") - A
Vibrator
for interacting with the vibrator hardware. -
CONNECTIVITY_SERVICE
("connectivity") - A
ConnectivityManager
for handling management of network connections. -
IPSEC_SERVICE
("ipsec") - A
IpSecManager
for managing IPSec on sockets and networks. -
WIFI_SERVICE
("wifi") - A
WifiManager
for management of Wi-Fi connectivity. On releases before Android 7, it should only be obtained from an application context, and not from any other derived context to avoid memory leaks within the calling process. -
WIFI_AWARE_SERVICE
("wifiaware") - A
WifiAwareManager
for management of Wi-Fi Aware discovery and connectivity. -
WIFI_P2P_SERVICE
("wifip2p") - A
WifiP2pManager
for management of Wi-Fi Direct connectivity. -
INPUT_METHOD_SERVICE
("input_method") - An
InputMethodManager
for management of input methods. -
UI_MODE_SERVICE
("uimode") - An
UiModeManager
for controlling UI modes. -
DOWNLOAD_SERVICE
("download") - A
DownloadManager
for requesting HTTP downloads -
BATTERY_SERVICE
("batterymanager") - A
BatteryManager
for managing battery state -
JOB_SCHEDULER_SERVICE
("taskmanager") - A
JobScheduler
for managing scheduled tasks -
NETWORK_STATS_SERVICE
("netstats") - A
NetworkStatsManager
for querying network usage statistics. -
HARDWARE_PROPERTIES_SERVICE
("hardware_properties") - A
HardwarePropertiesManager
for accessing hardware properties. -
DOMAIN_VERIFICATION_SERVICE
("domain_verification") - A
DomainVerificationManager
for accessing web domain approval state. -
DISPLAY_HASH_SERVICE
("display_hash") - A
DisplayHashManager
for management of display hashes. -
ERROR(/#AUTHENTICATION_POLICY_SERVICE)
("authentication_policy") - A
ERROR(/android.security.authenticationpolicy.AuthenticationPolicyManager)
for managing authentication related policies on the device.
Note: System services obtained via this API may be closely associated with the Context in which they are obtained from. In general, do not share the service objects between various different contexts (Activities, Applications, Services, Providers, etc.)
Note: Instant apps, for which PackageManager.isInstantApp()
returns true,
don't have access to the following system services: DEVICE_POLICY_SERVICE
,
FINGERPRINT_SERVICE
, KEYGUARD_SERVICE
, SHORTCUT_SERVICE
,
USB_SERVICE
, WALLPAPER_SERVICE
, WIFI_P2P_SERVICE
,
WIFI_SERVICE
, WIFI_AWARE_SERVICE
. For these services this method will
return null
. Generally, if you are running as an instant app you should always
check whether the result of this method is null
.
Note: When implementing this method, keep in mind that new services can be added on newer
Android releases, so if you're looking for just the explicit names mentioned above, make sure
to return null
when you don't recognize the name — if you throw a
RuntimeException
exception instead, your app might break on new Android releases.
Parameters | |
---|---|
name |
String : This value cannot be null . |
Returns | |
---|---|
Object |
This value may be null . |
getTextForImeAction
public CharSequence getTextForImeAction (int imeOptions)
Return text that can be used as a button label for the given
EditorInfo.imeOptions
. Returns null
if there is no action requested. Note that there is no guarantee that
the returned text will be relatively short, so you probably do not
want to use it as text on a soft keyboard key label.
Parameters | |
---|---|
imeOptions |
int : The value from EditorInfo.imeOptions . |
Returns | |
---|---|
CharSequence |
Returns a label to use, or null if there is no action. |
isExtractViewShown
public boolean isExtractViewShown ()
Return whether the fullscreen extract view is shown. This will only
return true if isFullscreenMode()
returns true, and in that
case its value depends on the last call to
setExtractViewShown(boolean)
. This effectively lets you
determine if the application window is entirely covered (when this
returns true) or if some part of it may be shown (if this returns
false, though if isFullscreenMode()
returns true in that case
then it is probably only a sliver of the application).
Returns | |
---|---|
boolean |
isFullscreenMode
public boolean isFullscreenMode ()
Return whether the input method is currently running in
fullscreen mode. This is the mode that was last determined and
applied by updateFullscreenMode()
.
Returns | |
---|---|
boolean |
isInputViewShown
public boolean isInputViewShown ()
Return whether the soft input view is currently shown to the
user. This is the state that was last determined and
applied by updateInputViewShown()
.
Returns | |
---|---|
boolean |
isShowInputRequested
public boolean isShowInputRequested ()
Returns true if we have been asked to show our input view.
Returns | |
---|---|
boolean |
onAppPrivateCommand
public void onAppPrivateCommand (String action, Bundle data)
Not implemented in this class.
Parameters | |
---|---|
action |
String |
data |
Bundle |
onBindInput
public void onBindInput ()
Called when a new client has bound to the input method. This
may be followed by a series of onStartInput(android.view.inputmethod.EditorInfo, boolean)
and onFinishInput()
calls as the user navigates through its
UI. Upon this call you know that getCurrentInputBinding()
and getCurrentInputConnection()
return valid objects.
onComputeInsets
public void onComputeInsets (InputMethodService.Insets outInsets)
Compute the interesting insets into your UI. The default implementation
uses the top of the candidates frame for the visible insets, and the
top of the input frame for the content insets. The default touchable
insets are Insets.TOUCHABLE_INSETS_VISIBLE
.
Note that this method is not called when
isExtractViewShown()
returns true, since
in that case the application is left as-is behind the input method and
not impacted by anything in its UI.
Parameters | |
---|---|
outInsets |
InputMethodService.Insets : Fill in with the current UI insets. |
onConfigurationChanged
public void onConfigurationChanged (Configuration newConfig)
Take care of handling configuration changes. Subclasses of
InputMethodService generally don't need to deal directly with
this on their own; the standard implementation here takes care of
regenerating the input method UI as a result of the configuration
change, so you can rely on your onCreateInputView()
and
other methods being called as appropriate due to a configuration change.
When a configuration change does happen,
onInitializeInterface()
is guaranteed to be called the next
time prior to any of the other input or UI creation callbacks. The
following will be called immediately depending if appropriate for current
state: onStartInput(EditorInfo, boolean)
if input is active, and
onCreateInputView()
and onStartInputView(EditorInfo, boolean)
and related
appropriate functions if the UI is displayed.
Starting with Build.VERSION_CODES.S
, IMEs can opt into handling configuration
changes themselves instead of being restarted with
R.styleable.InputMethod_configChanges
.
Parameters | |
---|---|
newConfig |
Configuration : This value cannot be null . |
onConfigureWindow
public void onConfigureWindow (Window win, boolean isFullscreen, boolean isCandidatesOnly)
Update the given window's parameters for the given mode. This is called when the window is first displayed and each time the fullscreen or candidates only mode changes.
The default implementation makes the layout for the window MATCH_PARENT x MATCH_PARENT when in fullscreen mode, and MATCH_PARENT x WRAP_CONTENT when in non-fullscreen mode.
Parameters | |
---|---|
win |
Window : The input method's window. |
isFullscreen |
boolean : If true, the window is running in fullscreen mode
and intended to cover the entire application display. |
isCandidatesOnly |
boolean : If true, the window is only showing the
candidates view and none of the rest of its UI. This is mutually
exclusive with fullscreen mode. |
onCreate
public void onCreate ()
Called by the system when the service is first created. Do not call this method directly.
onCreateCandidatesView
public View onCreateCandidatesView ()
Create and return the view hierarchy used to show candidates. This will be called once, when the candidates are first displayed. You can return null to have no candidates view; the default implementation returns null.
To control when the candidates view is displayed, use
setCandidatesViewShown(boolean)
.
To change the candidates view after the first one is created by this
function, use setCandidatesView(android.view.View)
.
Returns | |
---|---|
View |
onCreateExtractTextView
public View onCreateExtractTextView ()
Called by the framework to create the layout for showing extracted text.
Only called when in fullscreen mode. The returned view hierarchy must
have an ExtractEditText
whose ID is
R.id.inputExtractEditText
, with action ID
R.id.inputExtractAction
and accessories ID
R.id.inputExtractAccessories
.
Returns | |
---|---|
View |
onCreateInlineSuggestionsRequest
public InlineSuggestionsRequest onCreateInlineSuggestionsRequest (Bundle uiExtras)
Called when Autofill is requesting an InlineSuggestionsRequest
from the IME.
The Autofill Framework will first request the IME to create and send an
InlineSuggestionsRequest
back. Once Autofill Framework receives a valid request and
also receives valid inline suggestions, they will be returned via
onInlineSuggestionsResponse(android.view.inputmethod.InlineSuggestionsResponse)
.
IME Lifecycle - The request will wait to be created after inputStarted
If the IME wants to support displaying inline suggestions, they must set
supportsInlineSuggestions in its XML and implement this method to return a valid
InlineSuggestionsRequest
.
Parameters | |
---|---|
uiExtras |
Bundle : the extras that contain the UI renderer related information
This value cannot be null . |
Returns | |
---|---|
InlineSuggestionsRequest |
an InlineSuggestionsRequest to be sent to Autofill.
This value may be null . |
onCreateInputMethodInterface
public AbstractInputMethodService.AbstractInputMethodImpl onCreateInputMethodInterface ()
This method is deprecated.
Overriding or calling this method is strongly discouraged. A future version of
Android will remove the ability to use this method. Use the callbacks on
InputMethodService
as InputMethodService.onBindInput()
,
InputMethodService.onUnbindInput()
, InputMethodService.onWindowShown()
,
InputMethodService.onWindowHidden()
, etc.
Implement to return our standard InputMethodImpl
.
Returns | |
---|---|
AbstractInputMethodService.AbstractInputMethodImpl |
onCreateInputMethodSessionInterface
public AbstractInputMethodService.AbstractInputMethodSessionImpl onCreateInputMethodSessionInterface ()
This method is deprecated.
Overriding or calling this method is strongly discouraged.
Most methods in InputMethodSessionImpl
have corresponding callbacks.
Use InputMethodService.onFinishInput()
,
InputMethodService.onDisplayCompletions(CompletionInfo[])
,
InputMethodService.onUpdateExtractedText(int, ExtractedText)
,
InputMethodService.onUpdateSelection(int, int, int, int, int, int)
instead.
Implement to return our standard InputMethodSessionImpl
.
IMEs targeting on Android U and above cannot override this method, or an
LinkageError
would be thrown.
Returns | |
---|---|
AbstractInputMethodService.AbstractInputMethodSessionImpl |
onCreateInputView
public View onCreateInputView ()
Create and return the view hierarchy used for the input area (such as a soft keyboard). This will be called once, when the input area is first displayed. You can return null to have no input area; the default implementation returns null.
To control when the input view is displayed, implement
onEvaluateInputViewShown()
.
To change the input view after the first one is created by this
function, use setInputView(android.view.View)
.
Returns | |
---|---|
View |
onCustomImeSwitcherButtonRequestedVisible
public void onCustomImeSwitcherButtonRequestedVisible (boolean visible)
Called when the requested visibility of a custom IME Switcher button changes.
When the system provides an IME navigation bar, it may decide to show an IME Switcher
button inside this bar. However, the IME can request hiding the bar provided by the system
with getWindowInsetsController().hide(captionBar())
(the IME navigation bar provides
captionBar
insets to the IME window). If the request is successful,
then it becomes the IME's responsibility to provide a custom IME Switcher button in its
input view, with equivalent functionality.
This custom button is only requested to be visible when the system provides the IME
navigation bar, both the bar and the IME Switcher button inside it should be visible,
but the IME successfully requested to hide the bar. This does not depend on the current
visibility of the IME. It could be called with true
while the IME is hidden, in
which case the IME should prepare to show the button as soon as the IME itself is shown.
This is only called when the requested visibility changes. The default value is
false
and as such, this will not be called initially if the resulting value is
false
.
This can be called at any time after onCreate()
, even if the IME is not currently
visible. However, this is not guaranteed to be called before the IME is shown, as it depends
on when the IME requested hiding the IME navigation bar. If the request is sent during
the showing flow (e.g. during onStartInputView(EditorInfo, boolean)
), this will be called shortly after
onWindowShown()
, but before the first IME frame is drawn.
Parameters | |
---|---|
visible |
boolean : whether the button is requested visible or not. |
onDestroy
public void onDestroy ()
Called by the system to notify a Service that it is no longer used and is being removed. The service should clean up any resources it holds (threads, registered receivers, etc) at this point. Upon return, there will be no more calls in to this Service object and it is effectively dead. Do not call this method directly. If you override this method you must call through to the superclass implementation.
onDisplayCompletions
public void onDisplayCompletions (CompletionInfo[] completions)
Called when the application has reported auto-completion candidates that it would like to have the input method displayed. Typically these are only used when an input method is running in full-screen mode, since otherwise the user can see and interact with the pop-up window of completions shown by the application.
The default implementation here does nothing.
Parameters | |
---|---|
completions |
CompletionInfo |
onEvaluateFullscreenMode
public boolean onEvaluateFullscreenMode ()
Override this to control when the input method should run in
fullscreen mode. The default implementation runs in fullsceen only
when the screen is in landscape mode. If you change what
this returns, you will need to call updateFullscreenMode()
yourself whenever the returned value may have changed to have it
re-evaluated and applied.
Returns | |
---|---|
boolean |
onEvaluateInputViewShown
public boolean onEvaluateInputViewShown ()
Override this to control when the soft input area should be shown to the user. The default
implementation returns false
when there is no hard keyboard or the keyboard is hidden
unless the user shows an intention to use software keyboard. If you change what this
returns, you will need to call updateInputViewShown()
yourself whenever the returned
value may have changed to have it re-evaluated and applied.
When you override this method, it is recommended to call
super.onEvaluateInputViewShown()
and return true
when true
is
returned.
If you override this method you must call through to the superclass implementation.
Returns | |
---|---|
boolean |
onExtractTextContextMenuItem
public boolean onExtractTextContextMenuItem (int id)
This is called when the user has selected a context menu item from the
extracted text view, when running in fullscreen mode. The default
implementation sends this action to the current InputConnection's
InputConnection.performContextMenuAction(int)
, for it
to be processed in underlying "real" editor. Re-implement this to
provide whatever behavior you want.
Parameters | |
---|---|
id |
int |
Returns | |
---|---|
boolean |
onExtractedCursorMovement
public void onExtractedCursorMovement (int dx, int dy)
This is called when the user has performed a cursor movement in the extracted text view, when it is running in fullscreen mode. The default implementation hides the candidates view when a vertical movement happens, but only if the extracted text editor has a vertical scroll bar because its text doesn't fit. Re-implement this to provide whatever behavior you want.
Parameters | |
---|---|
dx |
int : The amount of cursor movement in the x dimension. |
dy |
int : The amount of cursor movement in the y dimension. |
onExtractedSelectionChanged
public void onExtractedSelectionChanged (int start, int end)
This is called when the user has moved the cursor in the extracted text view, when running in fullsreen mode. The default implementation performs the corresponding selection change on the underlying text editor.
Parameters | |
---|---|
start |
int |
end |
int |
onExtractedTextClicked
public void onExtractedTextClicked ()
This is called when the user has clicked on the extracted text view, when running in fullscreen mode. The default implementation hides the candidates view when this happens, but only if the extracted text editor has a vertical scroll bar because its text doesn't fit. Re-implement this to provide whatever behavior you want.
onExtractingInputChanged
public void onExtractingInputChanged (EditorInfo ei)
This is called when, while currently displayed in extract mode, the current input target changes. The default implementation will auto-hide the IME if the new target is not a full editor, since this can be a confusing experience for the user.
Parameters | |
---|---|
ei |
EditorInfo |
onFinishCandidatesView
public void onFinishCandidatesView (boolean finishingInput)
Called when the candidates view is being hidden from the user. This will be called either prior to hiding the window, or prior to switching to another target for editing.
The default implementation uses the InputConnection to clear any active composing text; you can override this (not calling the base class implementation) to perform whatever behavior you would like.
Parameters | |
---|---|
finishingInput |
boolean : If true, onFinishInput() will be
called immediately after. |
onFinishInput
public void onFinishInput ()
Called to inform the input method that text input has finished in
the last editor. At this point there may be a call to
onStartInput(android.view.inputmethod.EditorInfo, boolean)
to perform input in a
new editor, or the input method may be left idle. This method is
not called when input restarts in the same editor.
The default implementation uses the InputConnection to clear any active composing text; you can override this (not calling the base class implementation) to perform whatever behavior you would like.
onFinishInputView
public void onFinishInputView (boolean finishingInput)
Called when the input view is being hidden from the user. This will be called either prior to hiding the window, or prior to switching to another target for editing.
The default implementation uses the InputConnection to clear any active composing text; you can override this (not calling the base class implementation) to perform whatever behavior you would like.
Parameters | |
---|---|
finishingInput |
boolean : If true, onFinishInput() will be
called immediately after. |
onFinishStylusHandwriting
public void onFinishStylusHandwriting ()
Called when the current stylus handwriting session was finished (either by the system or
via finishStylusHandwriting()
.
When this is called, the ink window has been made invisible, and the IME no longer
intercepts handwriting-related MotionEvent
s.
onGenericMotionEvent
public boolean onGenericMotionEvent (MotionEvent event)
Override this to intercept generic motion events before they are processed by the application. If you return true, the application will not itself process the event. If you return false, the normal application processing will occur as if the IME had not seen the event at all.
Parameters | |
---|---|
event |
MotionEvent : The motion event being received. |
Returns | |
---|---|
boolean |
True if the event was handled in this function, false otherwise. |
onInitializeInterface
public void onInitializeInterface ()
This is a hook that subclasses can use to perform initialization of their interface. It is called for you prior to any of your UI objects being created, both after the service is first created and after a configuration change happens.
onInlineSuggestionsResponse
public boolean onInlineSuggestionsResponse (InlineSuggestionsResponse response)
Called when Autofill responds back with InlineSuggestionsResponse
containing
inline suggestions.
Should be implemented by subclasses.
Parameters | |
---|---|
response |
InlineSuggestionsResponse : InlineSuggestionsResponse passed back by Autofill.
This value cannot be null . |
Returns | |
---|---|
boolean |
Whether the IME will use and render the inline suggestions. |
onKeyDown
public boolean onKeyDown (int keyCode, KeyEvent event)
Called back when a KeyEvent
is forwarded from the target application.
The default implementation intercepts KeyEvent.KEYCODE_BACK
if the IME is
currently shown , to possibly hide it when the key goes up (if not canceled or long pressed).
In addition, in fullscreen mode only, it will consume DPAD movement events to move the cursor
in the extracted text view, not allowing them to perform navigation in the underlying
application.
The default implementation does not take flags specified to
setBackDisposition(int)
into account, even on API version
Build.VERSION_CODES.P
and later devices. IME developers are responsible
for making sure that their special handling for KeyEvent.KEYCODE_BACK
are consistent
with the flag they specified to setBackDisposition(int)
.
Parameters | |
---|---|
keyCode |
int : The value in event.getKeyCode() |
event |
KeyEvent : Description of the key event |
Returns | |
---|---|
boolean |
true if the event is consumed by the IME and the application no longer needs
to consume it. Return false when the event should be handled as if the IME
had not seen the event at all. |
onKeyLongPress
public boolean onKeyLongPress (int keyCode, KeyEvent event)
Default implementation of KeyEvent.Callback.onKeyLongPress()
: always returns false (doesn't handle
the event).
Parameters | |
---|---|
keyCode |
int |
event |
KeyEvent |
Returns | |
---|---|
boolean |
onKeyMultiple
public boolean onKeyMultiple (int keyCode, int count, KeyEvent event)
Override this to intercept special key multiple events before they are processed by the application. If you return true, the application will not itself process the event. If you return false, the normal application processing will occur as if the IME had not seen the event at all.
The default implementation always returns false, except when in fullscreen mode, where it will consume DPAD movement events to move the cursor in the extracted text view, not allowing them to perform navigation in the underlying application.
Parameters | |
---|---|
keyCode |
int |
count |
int |
event |
KeyEvent |
Returns | |
---|---|
boolean |
onKeyUp
public boolean onKeyUp (int keyCode, KeyEvent event)
Override this to intercept key up events before they are processed by the application. If you return true, the application will not itself process the event. If you return false, the normal application processing will occur as if the IME had not seen the event at all.
The default implementation intercepts KeyEvent.KEYCODE_BACK
to hide the current IME UI if it is shown. In
addition, in fullscreen mode only, it will consume DPAD movement
events to move the cursor in the extracted text view, not allowing
them to perform navigation in the underlying application.
Parameters | |
---|---|
keyCode |
int |
event |
KeyEvent |
Returns | |
---|---|
boolean |
onPrepareStylusHandwriting
public void onPrepareStylusHandwriting ()
Called to prepare stylus handwriting.
The system calls this before the onStartStylusHandwriting()
request.
Note: The system tries to call this as early as possible, when it detects that
handwriting stylus input is imminent. However, that a subsequent call to
onStartStylusHandwriting()
actually happens is not guaranteed.
onShowInputRequested
public boolean onShowInputRequested (int flags, boolean configChange)
The system has decided that it may be time to show your input method.
This is called due to a corresponding call to your
InputMethod.showSoftInput()
method. The default implementation uses
onEvaluateInputViewShown()
, onEvaluateFullscreenMode()
,
and the current configuration to decide whether the input view should
be shown at this point.
Parameters | |
---|---|
flags |
int : Value is either 0 or a combination of InputMethod.SHOW_EXPLICIT , and InputMethod.SHOW_FORCED |
configChange |
boolean : This is true if we are re-showing due to a
configuration change. |
Returns | |
---|---|
boolean |
Returns true to indicate that the window should be shown. |
onStartCandidatesView
public void onStartCandidatesView (EditorInfo editorInfo, boolean restarting)
Called when only the candidates view has been shown for showing
processing as the user enters text through a hard keyboard.
This will always be called after onStartInput(EditorInfo, boolean)
,
allowing you to do your general setup there and just view-specific
setup here. You are guaranteed that onCreateCandidatesView()
will have been called some time before this function is called.
Note that this will not be called when the input method
is running in full editing mode, and thus receiving
onStartInputView(EditorInfo, boolean)
to initiate that operation. This is only
for the case when candidates are being shown while the input method
editor is hidden but wants to show its candidates UI as text is
entered through some other mechanism.
Parameters | |
---|---|
editorInfo |
EditorInfo : Description of the type of text being edited. |
restarting |
boolean : Set to true if we are restarting input on the
same text field as before. |
onStartConnectionlessStylusHandwriting
public boolean onStartConnectionlessStylusHandwriting (int inputType, CursorAnchorInfo cursorAnchorInfo)
Called when an app requests to start a connectionless stylus handwriting session using one of
InputMethodManager.startConnectionlessStylusHandwriting(View, CursorAnchorInfo,
Executor, ConnectionlessHandwritingCallback)
, InputMethodManager.startConnectionlessStylusHandwritingForDelegation(android.view.View, android.view.inputmethod.CursorAnchorInfo, java.util.concurrent.Executor, android.view.inputmethod.ConnectionlessHandwritingCallback)
, or InputMethodManager.startConnectionlessStylusHandwritingForDelegation(android.view.View, android.view.inputmethod.CursorAnchorInfo, java.lang.String, java.util.concurrent.Executor, android.view.inputmethod.ConnectionlessHandwritingCallback)
.
A connectionless stylus handwriting session differs from a regular session in that an
input connection is not used to communicate with a text editor. Instead, the recognised text
is delivered when the IME finishes the connectionless session using finishConnectionlessStylusHandwriting(java.lang.CharSequence)
.
If the IME can start the connectionless handwriting session, it should return true
, ensure its inking views are attached to the getStylusHandwritingWindow()
, and
handle stylus input received from onStylusHandwritingMotionEvent(android.view.MotionEvent)
on the
getStylusHandwritingWindow()
.
Parameters | |
---|---|
inputType |
int |
cursorAnchorInfo |
CursorAnchorInfo : This value may be null . |
Returns | |
---|---|
boolean |
onStartInput
public void onStartInput (EditorInfo attribute, boolean restarting)
Called to inform the input method that text input has started in an editor. You should use this callback to initialize the state of your input to match the state of the editor given to it.
Parameters | |
---|---|
attribute |
EditorInfo : The attributes of the editor that input is starting
in. |
restarting |
boolean : Set to true if input is restarting in the same
editor such as because the application has changed the text in
the editor. Otherwise will be false, indicating this is a new
session with the editor. |
onStartInputView
public void onStartInputView (EditorInfo editorInfo, boolean restarting)
Called when the input view is being shown and input has started on
a new editor. This will always be called after onStartInput(EditorInfo, boolean)
,
allowing you to do your general setup there and just view-specific
setup here. You are guaranteed that onCreateInputView()
will
have been called some time before this function is called.
Parameters | |
---|---|
editorInfo |
EditorInfo : Description of the type of text being edited. |
restarting |
boolean : Set to true if we are restarting input on the
same text field as before. |
onStartStylusHandwriting
public boolean onStartStylusHandwriting ()
Called when an app requests stylus handwriting
InputMethodManager.startStylusHandwriting(View)
.
This will always be preceded by onStartInput(android.view.inputmethod.EditorInfo, boolean)
for the
EditorInfo
and InputConnection
for which stylus handwriting is being
requested.
If the IME supports handwriting for the current input, it should return true
,
ensure its inking views are attached to the getStylusHandwritingWindow()
, and handle
stylus input received from onStylusHandwritingMotionEvent(android.view.MotionEvent)
on the
getStylusHandwritingWindow()
via getCurrentInputConnection()
.
Returns | |
---|---|
boolean |
true if IME can honor the request, false if IME cannot at this time. |
onStylusHandwritingMotionEvent
public void onStylusHandwritingMotionEvent (MotionEvent motionEvent)
Called after onStartStylusHandwriting()
returns true
for every Stylus
MotionEvent
.
By default, this method forwards all MotionEvent
s to the
getStylusHandwritingWindow()
once its visible, however IME can override it to
receive them sooner.
Parameters | |
---|---|
motionEvent |
MotionEvent : MotionEvent from stylus.
This value cannot be null . |
onTrackballEvent
public boolean onTrackballEvent (MotionEvent event)
Override this to intercept trackball motion events before they are processed by the application. If you return true, the application will not itself process the event. If you return false, the normal application processing will occur as if the IME had not seen the event at all.
Parameters | |
---|---|
event |
MotionEvent : The motion event being received. |
Returns | |
---|---|
boolean |
True if the event was handled in this function, false otherwise. |
onUnbindInput
public void onUnbindInput ()
Called when the previous bound client is no longer associated
with the input method. After returning getCurrentInputBinding()
and getCurrentInputConnection()
will no longer return
valid objects.
onUpdateCursor
public void onUpdateCursor (Rect newCursor)
This method was deprecated
in API level 21.
Use onUpdateCursorAnchorInfo(android.view.inputmethod.CursorAnchorInfo)
instead.
Called when the application has reported a new location of its text cursor. This is only called if explicitly requested by the input method. The default implementation does nothing.
Parameters | |
---|---|
newCursor |
Rect |
onUpdateCursorAnchorInfo
public void onUpdateCursorAnchorInfo (CursorAnchorInfo cursorAnchorInfo)
Called when the application has reported a new location of its text insertion point and characters in the composition string. This is only called if explicitly requested by the input method. The default implementation does nothing.
Parameters | |
---|---|
cursorAnchorInfo |
CursorAnchorInfo : The positional information of the text insertion point and the
composition string. |
onUpdateEditorToolType
public void onUpdateEditorToolType (int toolType)
Called when the user tapped or clicked an editor.
This can be useful when IME makes a decision of showing Virtual keyboard based on what
MotionEvent.getToolType(int)
was used to click the editor.
e.g. when toolType is MotionEvent.TOOL_TYPE_STYLUS
, IME may choose to show a
companion widget instead of normal virtual keyboard.
This method is called after onStartInput(android.view.inputmethod.EditorInfo, boolean)
and before
onStartInputView(android.view.inputmethod.EditorInfo, boolean)
when editor was clicked with a known tool
type.
Default implementation does nothing.
Parameters | |
---|---|
toolType |
int : what MotionEvent.getToolType(int) was used to click on editor.
Value is MotionEvent.TOOL_TYPE_UNKNOWN , MotionEvent.TOOL_TYPE_FINGER , MotionEvent.TOOL_TYPE_STYLUS , MotionEvent.TOOL_TYPE_MOUSE , MotionEvent.TOOL_TYPE_ERASER , or android.view.MotionEvent.TOOL_TYPE_PALM |
onUpdateExtractedText
public void onUpdateExtractedText (int token, ExtractedText text)
Called when the application has reported new extracted text to be shown due to changes in its current text state. The default implementation here places the new text in the extract edit text, when the input method is running in fullscreen mode.
Parameters | |
---|---|
token |
int |
text |
ExtractedText |
onUpdateExtractingViews
public void onUpdateExtractingViews (EditorInfo ei)
Called when the fullscreen-mode extracting editor info has changed, to update the state of its UI such as the action buttons shown. You do not need to deal with this if you are using the standard full screen extract UI. If replacing it, you will need to re-implement this to put the appropriate action button in your own UI and handle it, and perform any other changes.
The standard implementation turns on or off its accessory area
depending on whether there is an action button, and hides or shows
the entire extract area depending on whether it makes sense for the
current editor. In particular, a InputType.TYPE_NULL
or
InputType.TYPE_TEXT_VARIATION_FILTER
input type will turn off the
extract area since there is no text to be shown.
Parameters | |
---|---|
ei |
EditorInfo |
onUpdateExtractingVisibility
public void onUpdateExtractingVisibility (EditorInfo ei)
Called when the fullscreen-mode extracting editor info has changed,
to determine whether the extracting (extract text and candidates) portion
of the UI should be shown. The standard implementation hides or shows
the extract area depending on whether it makes sense for the
current editor. In particular, a InputType.TYPE_NULL
input type or EditorInfo.IME_FLAG_NO_EXTRACT_UI
flag will
turn off the extract area since there is no text to be shown.
Parameters | |
---|---|
ei |
EditorInfo |
onUpdateSelection
public void onUpdateSelection (int oldSelStart, int oldSelEnd, int newSelStart, int newSelEnd, int candidatesStart, int candidatesEnd)
Called when the application has reported a new selection region of the text. This is called whether or not the input method has requested extracted text updates, although if so it will not receive this call if the extracted text has changed as well.
The default implementation takes care of updating the cursor in the extract text, if it is being shown.
Parameters | |
---|---|
oldSelStart |
int |
oldSelEnd |
int |
newSelStart |
int |
newSelEnd |
int |
candidatesStart |
int |
candidatesEnd |
int |
onViewClicked
public void onViewClicked (boolean focusChanged)
This method was deprecated
in API level 29.
The method may not be called for composite View
that works as a giant
"Canvas", which can host its own UI hierarchy and sub focus state.
WebView
is a good example. Application / IME developers
should not rely on this method. If your goal is just being notified when an
on-going input is interrupted, simply monitor onFinishInput()
.
If your goal is to know what MotionEvent.getToolType(int)
clicked on
editor, use onUpdateEditorToolType(int)
instead.
Called when the user tapped or clicked a text view. IMEs can't rely on this method being called because this was not part of the original IME protocol, so applications with custom text editing written before this method appeared will not call to inform the IME of this interaction.
Parameters | |
---|---|
focusChanged |
boolean : true if the user changed the focused view by this click. |
onWindowHidden
public void onWindowHidden ()
Called when the input method window has been hidden from the user, after previously being visible.
onWindowShown
public void onWindowShown ()
Called immediately before the input method window is shown to the user. You could override this to prepare for the window to be shown (update view structure etc).
requestHideSelf
public void requestHideSelf (int flags)
Close this input method's soft input area, removing it from the display. The input method will continue running, but the user can no longer use it to generate input by touching the screen.
Parameters | |
---|---|
flags |
int : Value is either 0 or a combination of InputMethodManager.HIDE_IMPLICIT_ONLY , and InputMethodManager.HIDE_NOT_ALWAYS |
requestShowSelf
public final void requestShowSelf (int flags)
Show the input method's soft input area, so the user sees the input method window and can interact with it.
Parameters | |
---|---|
flags |
int : Value is either 0 or a combination of InputMethodManager.SHOW_IMPLICIT , and InputMethodManager.SHOW_FORCED |
sendDefaultEditorAction
public boolean sendDefaultEditorAction (boolean fromEnterKey)
Ask the input target to execute its default action via
InputConnection.performEditorAction()
.
For compatibility, this method does not execute a custom action even if EditorInfo.actionLabel
is set. The implementor should directly call
InputConnection.performEditorAction()
with
EditorInfo.actionId
if they want to execute a custom action.
Parameters | |
---|---|
fromEnterKey |
boolean : If true, this will be executed as if the user had
pressed an enter key on the keyboard, that is it will not
be done if the editor has set EditorInfo.IME_FLAG_NO_ENTER_ACTION . If false, the action will be
sent regardless of how the editor has set that flag. |
Returns | |
---|---|
boolean |
Returns a boolean indicating whether an action has been sent. If false, either the editor did not specify a default action or it does not want an action from the enter key. If true, the action was sent (or there was no input connection at all). |
sendDownUpKeyEvents
public void sendDownUpKeyEvents (int keyEventCode)
Send the given key event code (as defined by KeyEvent
) to the
current input connection is a key down + key up event pair. The sent
events have KeyEvent.FLAG_SOFT_KEYBOARD
set, so that the recipient can identify them as coming from a software
input method, and
KeyEvent.FLAG_KEEP_TOUCH_MODE
, so
that they don't impact the current touch mode of the UI.
Note that it's discouraged to send such key events in normal operation;
this is mainly for use with InputType.TYPE_NULL
type
text fields, or for non-rich input methods. A reasonably capable software
input method should use the
InputConnection.commitText(CharSequence, int)
family of methods
to send text to an application, rather than sending key events.
Parameters | |
---|---|
keyEventCode |
int : The raw key code to send, as defined by
KeyEvent . |
sendKeyChar
public void sendKeyChar (char charCode)
Send the given UTF-16 character to the current input connection. Most
characters will be delivered simply by calling
InputConnection.commitText()
with
the character; some, however, may be handled different. In particular,
the enter character ('\n') will either be delivered as an action code
or a raw key event, as appropriate. Consider this as a convenience
method for IMEs that do not have a full implementation of actions; a
fully complying IME will decide of the right action for each event and
will likely never call this method except maybe to handle events coming
from an actual hardware keyboard.
Parameters | |
---|---|
charCode |
char : The UTF-16 character code to send. |
setBackDisposition
public void setBackDisposition (int disposition)
Sets the disposition mode that indicates the expected affordance for the back button.
Keep in mind that specifying this flag does not change the the default behavior of
onKeyDown(int, android.view.KeyEvent)
. It is IME developers' responsibility for making sure that
their custom implementation of onKeyDown(int, android.view.KeyEvent)
is consistent with the mode
specified to this API.
Parameters | |
---|---|
disposition |
int : disposition mode to be set
Value is BACK_DISPOSITION_DEFAULT , BACK_DISPOSITION_WILL_NOT_DISMISS , BACK_DISPOSITION_WILL_DISMISS , or BACK_DISPOSITION_ADJUST_NOTHING |
See also:
setCandidatesView
public void setCandidatesView (View view)
Replaces the current candidates view with a new one. You only need to
call this when dynamically changing the view; normally, you should
implement onCreateCandidatesView()
and create your view when
first needed by the input method.
Parameters | |
---|---|
view |
View |
setCandidatesViewShown
public void setCandidatesViewShown (boolean shown)
Controls the visibility of the candidates display area. By default it is hidden.
Parameters | |
---|---|
shown |
boolean |
setExtractViewShown
public void setExtractViewShown (boolean shown)
Controls the visibility of the extracted text area. This only applies
when the input method is in fullscreen mode, and thus showing extracted
text. When false, the extracted text will not be shown, allowing some
of the application to be seen behind. This is normally set for you
by onUpdateExtractingVisibility(EditorInfo)
. This controls the visibility
of both the extracted text and candidate view; the latter since it is
not useful if there is no text to see.
Parameters | |
---|---|
shown |
boolean |
setInputView
public void setInputView (View view)
Replaces the current input view with a new one. You only need to
call this when dynamically changing the view; normally, you should
implement onCreateInputView()
and create your view when
first needed by the input method.
Parameters | |
---|---|
view |
View |
setStylusHandwritingSessionTimeout
public final void setStylusHandwritingSessionTimeout (Duration duration)
Sets the duration after which an ongoing stylus handwriting session that hasn't received new
MotionEvent
s will time out and finishStylusHandwriting()
will be called.
The maximum allowed duration is returned by
getStylusHandwritingIdleTimeoutMax()
, larger values will be clamped.
Note: this value is bound to the InputMethodService
instance and resets to the
default whenever a new instance is constructed.
Parameters | |
---|---|
duration |
Duration : timeout to set.
This value cannot be null . |
setTheme
public void setTheme (int theme)
You can call this to customize the theme used by your IME's window.
This theme should typically be one that derives from
R.style.Theme_InputMethod
, which is the default theme
you will get. This must be set before onCreate()
, so you
will typically call it in your constructor with the resource ID
of your custom theme.
Parameters | |
---|---|
theme |
int : The style resource describing the theme. |
shouldOfferSwitchingToNextInputMethod
public final boolean shouldOfferSwitchingToNextInputMethod ()
Returns true if the current IME needs to offer the users ways to switch to a next input
method (e.g. a globe key.).
When an IME sets supportsSwitchingToNextInputMethod and this method returns true,
the IME has to offer ways to to invoke switchToNextInputMethod(boolean)
accordingly.
Note that the system determines the most appropriate next input method and subtype in order to provide the consistent user experience in switching between IMEs and subtypes.
Returns | |
---|---|
boolean |
showStatusIcon
public void showStatusIcon (int iconResId)
Parameters | |
---|---|
iconResId |
int |
showWindow
public void showWindow (boolean showInput)
Parameters | |
---|---|
showInput |
boolean |
switchInputMethod
public void switchInputMethod (String id)
Force switch to a new input method, as identified by id. This input method will be destroyed, and the requested one started on the current input field.
Parameters | |
---|---|
id |
String : Unique identifier of the new input method to start. |
Throws | |
---|---|
IllegalArgumentException |
if the input method is unknown or filtered by the rules of package visibility. |
switchInputMethod
public final void switchInputMethod (String id, InputMethodSubtype subtype)
Force switch to a new input method, as identified by id
. This
input method will be destroyed, and the requested one started on the
current input field.
Parameters | |
---|---|
id |
String : Unique identifier of the new input method to start. |
subtype |
InputMethodSubtype : The new subtype of the new input method to be switched to. |
Throws | |
---|---|
IllegalArgumentException |
if the input method is unknown or filtered by the rules of package visibility. |
switchToNextInputMethod
public final boolean switchToNextInputMethod (boolean onlyCurrentIme)
Force switch to the next input method and subtype. If there is no IME enabled except current IME and subtype, do nothing.
Parameters | |
---|---|
onlyCurrentIme |
boolean : if true, the framework will find the next subtype which
belongs to the current IME |
Returns | |
---|---|
boolean |
true if the current input method and subtype was successfully switched to the next input method and subtype. |
switchToPreviousInputMethod
public final boolean switchToPreviousInputMethod ()
Force switch to the last used input method and subtype. If the last input method didn't have any subtypes, the framework will simply switch to the last input method with no subtype specified.
Returns | |
---|---|
boolean |
true if the current input method and subtype was successfully switched to the last used input method and subtype. |
updateFullscreenMode
public void updateFullscreenMode ()
Re-evaluate whether the input method should be running in fullscreen
mode, and update its UI if this has changed since the last time it
was evaluated. This will call onEvaluateFullscreenMode()
to
determine whether it should currently run in fullscreen mode. You
can use isFullscreenMode()
to determine if the input method
is currently running in fullscreen mode.
updateInputViewShown
public void updateInputViewShown ()
Re-evaluate whether the soft input area should currently be shown, and
update its UI if this has changed since the last time it
was evaluated. This will call onEvaluateInputViewShown()
to
determine whether the input view should currently be shown. You
can use isInputViewShown()
to determine if the input view
is currently shown.
Protected methods
dump
protected void dump (FileDescriptor fd, PrintWriter fout, String[] args)
Performs a dump of the InputMethodService's internal state. Override to add your own information to the dump.
Parameters | |
---|---|
fd |
FileDescriptor : The raw file descriptor that the dump is being sent to. |
fout |
PrintWriter : The PrintWriter to which you should dump your state. This will be
closed for you after you return. |
args |
String : additional arguments to the dump request. |
onCurrentInputMethodSubtypeChanged
protected void onCurrentInputMethodSubtypeChanged (InputMethodSubtype newSubtype)
Called when the subtype was changed.
Parameters | |
---|---|
newSubtype |
InputMethodSubtype : the subtype which is being changed to. |
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Last updated 2024-12-18 UTC.