[英]Add a dimmer and change screen brightness on android like twilight app
要獲得此結果,您需要使用TYPE_SYSTEM_ALERT
類型創建一個窗口,並將其顯示在所有其他應用程序的頂部。 為此,您需要權限SYSTEM_ALERT_WINDOW :
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
然后使用所需的背景色創建一個新的布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF4081"
android:orientation="vertical">
</LinearLayout>
和Service
:
public class DrawOverAppsService extends Service {
public static final String TAG = "DrawOverAppsService";
private View mOverlayView;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
Log.d(TAG, "onCreate");
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
WindowManager.LayoutParams.MATCH_PARENT,
WindowManager.LayoutParams.MATCH_PARENT,
WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN |
WindowManager.LayoutParams.FLAG_DIM_BEHIND,
PixelFormat.TRANSLUCENT);
// An alpha value to apply to this entire window.
// An alpha of 1.0 means fully opaque and 0.0 means fully transparent
params.alpha = 0.1F;
// When FLAG_DIM_BEHIND is set, this is the amount of dimming to apply.
// Range is from 1.0 for completely opaque to 0.0 for no dim.
params.dimAmount = 0.8F;
WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mOverlayView = inflater.inflate(R.layout.overlay_view, null);
wm.addView(mOverlayView, params);
}
@Override
public void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy");
WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
wm.removeView(mOverlayView);
}
}
要顯示覆蓋,請使用以下命令啟動服務:
Intent intent = new Intent(this, DrawOverAppsService.class);
startService(intent);
並停止覆蓋:
Intent intent = new Intent(this, DrawOverAppsService.class);
stopService(intent);
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.