Android Activity加入半透明蒙板,实现夜间模式

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public void night() {
       if (mNightView == null) {
           mNightView = new TextView(this);
           mNightView.setBackgroundColor(Color.BLACK);
           windowLayout.addView(mNightView);
       }
       try {
           Animation hyperspaceJumpAnimation = AnimationUtils.loadAnimation(
                   this, com.aurora.R.anim.aurora_menu_cover_enter);
           mNightView.startAnimation(hyperspaceJumpAnimation);
       } catch (Exception ex) {
           ex.printStackTrace();
       }
   }

   public void day() {
       try {
           Animation hyperspaceJumpAnimation = AnimationUtils.loadAnimation(
                   this, com.aurora.R.anim.aurora_menu_cover_exit);
           mNightView.startAnimation(hyperspaceJumpAnimation);
       } catch (Exception ex) {
           ex.printStackTrace();
       }

}

private View mNightView = null;

private WindowManager mWindowManager;

@Override

protected void onCreate(Bundle savedInstanceState) {

mWindowManager = (WindowManager)getSystemService(Context.WINDOW_SERVICE);

super.onCreate(savedInstanceState);

}

public void night() {

WindowManager.LayoutParams lp = new WindowManager.LayoutParams(

LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT,

WindowManager.LayoutParams.TYPE_APPLICATION,

WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE

| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,

PixelFormat.TRANSLUCENT);

lp.gravity = Gravity.BOTTOM;// 可以自定义显示的位置

lp.y = 10;

if (mNightView == null) {

mNightView = new TextView(this);

mNightView.setBackgroundColor(0x80000000);

}

try{

mWindowManager.addView(mNightView, lp);

}catch(Exception ex){}

}

public void day(){

try{

mWindowManager.removeView(mNightView);

}catch(Exception ex){}

}

@Override

protected void onResume() {

if(CommonClass.IsNight){

night();

}else{

day();

}

super.onResume();

}

@Override

protected void onDestroy() {

super.onDestroy();

day();

}

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
        android:fillAfter="true" >
    <alpha
        android:duration="300"
        android:fromAlpha="0.0"
        android:interpolator="@android:anim/accelerate_decelerate_interpolator"
        android:toAlpha="0.4" />
</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
        android:fillAfter="true" >
    <alpha
        android:duration="300"
        android:fromAlpha="0.4"
        android:interpolator="@android:anim/accelerate_decelerate_interpolator"
        android:toAlpha="0.0" />
</set>