Created
December 9, 2016 08:37
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public static void expand(final View v) { | |
v.measure(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); | |
final int targetHeight = v.getMeasuredHeight(); | |
// Older versions of android (pre API 21) cancel animations for views with a height of 0. | |
v.getLayoutParams().height = 1; | |
v.setVisibility(View.VISIBLE); | |
Animation a = new Animation() | |
{ | |
@Override | |
protected void applyTransformation(float interpolatedTime, Transformation t) { | |
v.getLayoutParams().height = interpolatedTime == 1 | |
? LayoutParams.WRAP_CONTENT | |
: (int)(targetHeight * interpolatedTime); | |
v.requestLayout(); | |
} | |
@Override | |
public boolean willChangeBounds() { | |
return true; | |
} | |
}; | |
// 1dp/ms | |
a.setDuration((int)(targetHeight / v.getContext().getResources().getDisplayMetrics().density)); | |
v.startAnimation(a); | |
} | |
public static void collapse(final View v) { | |
final int initialHeight = v.getMeasuredHeight(); | |
Animation a = new Animation() | |
{ | |
@Override | |
protected void applyTransformation(float interpolatedTime, Transformation t) { | |
if(interpolatedTime == 1){ | |
v.setVisibility(View.GONE); | |
}else{ | |
v.getLayoutParams().height = initialHeight - (int)(initialHeight * interpolatedTime); | |
v.requestLayout(); | |
} | |
} | |
@Override | |
public boolean willChangeBounds() { | |
return true; | |
} | |
}; | |
// 1dp/ms | |
a.setDuration((int)(initialHeight / v.getContext().getResources().getDisplayMetrics().density)); | |
v.startAnimation(a); | |
} |
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