按钮点击效果，背景透明度变化。
继承Button，Button有点击效果。
继承LinearLayout，LinearLayout有点击效果。
```
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.annotation.SuppressLint;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import androidx.annotation.Nullable;
@SuppressLint("AppCompatCustomView")
public class AnimButton extends Button {
private static final float FROM_VALUE =1.0f;
private static final float TO_VALUE =0.94f;
private static final float ALPHA_VALUE =0.8f;
private AnimatorSetanimatorSet =new AnimatorSet();
public AnimButton(Context context) {
super(context);
init();
}
public AnimButton(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public AnimButton(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
public AnimButton(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init();
}
private void init() {
setClickable(true);
}
@Override
protected void onWindowVisibilityChanged(int visibility) {
super.onWindowVisibilityChanged(visibility);
if (visibility ==0) {
setAlpha(FROM_VALUE);
setScaleX(FROM_VALUE);
setScaleY(FROM_VALUE);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (isClickable() && isEnabled()) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
animOne(this);
}else if (event.getAction() == MotionEvent.ACTION_UP) {
animNormal(this);
}else if (event.getAction() == MotionEvent.ACTION_CANCEL) {
animNormal(this);
}
}
return super.onTouchEvent(event);
}
private void animNormal(View view) {
animatorSet.setDuration(250);
ObjectAnimator scaleX = ObjectAnimator.ofFloat(view, "scaleX", TO_VALUE, FROM_VALUE);
ObjectAnimator scaleY = ObjectAnimator.ofFloat(view, "scaleY", TO_VALUE, FROM_VALUE);
ObjectAnimator alpha = ObjectAnimator.ofFloat(view, "alpha", ALPHA_VALUE, FROM_VALUE);
animatorSet.play(scaleX).with(scaleY).with(alpha);
animatorSet.start();
}
private void animOne(View view) {
animatorSet.setDuration(200);
ObjectAnimator scaleX = ObjectAnimator.ofFloat(view, "scaleX", FROM_VALUE, TO_VALUE);
ObjectAnimator scaleY = ObjectAnimator.ofFloat(view, "scaleY", FROM_VALUE, TO_VALUE);
ObjectAnimator alpha = ObjectAnimator.ofFloat(view, "alpha", FROM_VALUE, ALPHA_VALUE);
animatorSet.play(scaleX).with(scaleY).with(alpha);
animatorSet.start();
}
}
```
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