从@Zielony的回答中,我确切地说到了我想要的地方.
下面是正确应用效果的代码.
scale_fab_in.xml
android:duration="500"
android:fromXScale="0"
android:fromYScale="0"
android:pivotX="50%"
android:pivotY="50%"
android:toXScale="1"
android:toYScale="1"
android:interpolator="@android:interpolator/overshoot"/>
scale_fab_out.xml
android:duration="400"
android:fromXScale="1"
android:fromYScale="1"
android:pivotX="50%"
android:pivotY="50%"
android:toXScale="0"
android:toYScale="0"
android:interpolator="@android:interpolator/overshoot"/>
编辑2016年2月16日 – 另一种方式：
将下面的代码放在您的FAB代码或任何其他视图中.
//global
private static final int FAB_ANIM_DURATION = 200;
public void hide() {
// Only use scale animation if FAB is visible
if (getVisibility() == View.VISIBLE) {
// Pivots indicate where the animation begins from
float pivotX = getPivotX() + getTranslationX();
float pivotY = getPivotY() + getTranslationY();
// Animate FAB shrinking
ScaleAnimation anim = new ScaleAnimation(1, 0, 1, 0, pivotX, pivotY);
anim.setDuration(FAB_ANIM_DURATION);
anim.setInterpolator(getInterpolator());
startAnimation(anim);
}
setVisibility(View.INVISIBLE);
}
public void show() {
show(0, 0);
}
public void show(float translationX, float translationY) {
// Set FAB's translation
setTranslation(translationX, translationY);
// Only use scale animation if FAB is hidden
if (getVisibility() != View.VISIBLE) {
// Pivots indicate where the animation begins from
float pivotX = getPivotX() + translationX;
float pivotY = getPivotY() + translationY;
ScaleAnimation anim;
// If pivots are 0, that means the FAB hasn't been drawn yet so just use the
// center of the FAB
if (pivotX == 0 || pivotY == 0) {
anim = new ScaleAnimation(0, 1, 0, 1, Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f);
} else {
anim = new ScaleAnimation(0, 1, 0, 1, pivotX, pivotY);
}
// Animate FAB expanding
anim.setDuration(FAB_ANIM_DURATION);
anim.setInterpolator(getInterpolator());
startAnimation(anim);
}
setVisibility(View.VISIBLE);
}
private void setTranslation(float translationX, float translationY) {
if (Build.VERSION.SDK_INT >= VERSION_CODES.HONEYCOMB_MR1) {
animate().setInterpolator(getInterpolator()).setDuration(FAB_ANIM_DURATION)
.translationX(translationX).translationY(translationY);
}
}
private Interpolator getInterpolator() {
return AnimationUtils.loadInterpolator(getContext(), R.interpolator.fab_interpolator);
}
@android:interpolator/decelerate_cubic
