FontScaleConverter
public
interface
FontScaleConverter
| android.content.res.FontScaleConverter |
A converter for non-linear font scaling. Converts font sizes given in "sp" dimensions to a "dp" dimension according to a non-linear curve.
This is meant to improve readability at larger font scales: larger fonts will scale up more slowly than smaller fonts, so we don't get ridiculously huge fonts that don't fit on the screen.
The thinking here is that large fonts are already big enough to read, but we still want to scale them slightly to preserve the visual hierarchy when compared to smaller fonts.
Summary
Public methods | |
|---|---|
abstract
float
|
convertDpToSp(float dp)
Converts a dimension in "dp" back to "sp". |
abstract
float
|
convertSpToDp(float sp)
Converts a dimension in "sp" to "dp". |
static
FontScaleConverter
|
forScale(float fontScale)
Finds a matching FontScaleConverter for the given fontScale factor. |
static
boolean
|
isNonLinearFontScalingActive(float fontScale)
Returns true if non-linear font scaling curves would be in effect for the given scale, false if the scaling would follow a linear curve or for no scaling. |
Public methods
convertDpToSp
public abstract float convertDpToSp (float dp)
Converts a dimension in "dp" back to "sp".
| Parameters | |
|---|---|
dp |
float |
| Returns | |
|---|---|
float |
|
convertSpToDp
public abstract float convertSpToDp (float sp)
Converts a dimension in "sp" to "dp".
| Parameters | |
|---|---|
sp |
float |
| Returns | |
|---|---|
float |
|
forScale
public static FontScaleConverter forScale (float fontScale)
Finds a matching FontScaleConverter for the given fontScale factor.
Generally you shouldn't need this; you can use TypedValue.applyDimension(int, float, DisplayMetrics) directly and it will do
the scaling conversion for you. Dimens and resources loaded from XML will also be
automatically converted. But for UI frameworks or other situations where you need to do the
conversion without an Android Context, you can use this method.
This method is safe to call from any thread.
| Parameters | |
|---|---|
fontScale |
float: the scale factor, usually from Configuration#fontScale. |
| Returns | |
|---|---|
FontScaleConverter |
a converter for the given scale, or null if non-linear scaling should not be used. |
isNonLinearFontScalingActive
public static boolean isNonLinearFontScalingActive (float fontScale)
Returns true if non-linear font scaling curves would be in effect for the given scale, false if the scaling would follow a linear curve or for no scaling.
Example usage: isNonLinearFontScalingActive(getResources().getConfiguration().fontScale)
This method is safe to call from any thread.
| Parameters | |
|---|---|
fontScale |
float |
| Returns | |
|---|---|
boolean |
|