Android 切換到當前頁面時，屏幕變亮/變暗

原博客/出處 https://blog.csdn.net/cao185493676/article/details/50587265

import android.os.Bundle;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
 
 
public class MainActivity extends Activity {
 
 
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
 
 
public void click(View view){
switch (view.getId()) {
case R.id.button1:
dimBackground(1.0f,0.0f);
break;
case R.id.button2:
dimBackground(0.5f,1.0f);
break;
default:
break;
}
}
@SuppressLint("NewApi")
private void dimBackground(final float from, final float to) {
    final Window window = getWindow();
    ValueAnimator valueAnimator = ValueAnimator.ofFloat(from, to);
    valueAnimator.setDuration(500);
    valueAnimator.addUpdateListener(new AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
            WindowManager.LayoutParams params = window.getAttributes();
            params.alpha = (Float) animation.getAnimatedValue();
            window.setAttributes(params);
        }
    });
 
 
    valueAnimator.start();
}
}

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作者：Android你好安卓
來源：CSDN
原文：https://blog.csdn.net/cao185493676/article/details/50587265
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