使用自定义动画,这是非常容易的,你可以改变任何你在applytransformation想, interpolatedTime - 这就像%,从开始到结束动画当前位置(并具有浮动从0到值1,所以这里使用这个interpolatedTime你可以遍历任何你能想象);)
static class HeightAnimation extends Animation{
private View view;
private int mViewHeightFrom;
private int mViewHeightTo;
public HeightAnimation(View view, int heightFrom, int heightTo){
this.view = view;
this.mViewHeightFrom = heightFrom;
this.mViewHeightTo = heightTo;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, (int)((mViewHeightTo - mViewHeightFrom)*interpolatedTime+0.5));
view.setLayoutParams(params);
}
@Override
public boolean willChangeBounds() {
return true;
}
@Override
public boolean isFillEnabled() {
return true;
}
}
与用法:
public static void applyAnimationHeightTransformation(Context context, View view, int viewHeightFrom, int viewHeightTo, int duration, int animationOffsetMilisec){
HeightAnimation anim = new HeightAnimation(view, viewHeightFrom, viewHeightTo);
anim.setStartOffset(animationOffsetMilisec);
anim.setDuration(duration);
//anim.setInterpolator(new OvershootInterpolator()); // here interpolators can be used
if(view != null) {
view.setAnimation(anim);
view.startAnimation(anim);
}
}
用于使高度更容易使用 - 通过转换为像素在dp中使用值:
public static int dpToPx(int dp) {
return (int)(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, YourApplication.getMainContext().getResources().getDisplayMetrics()));
}