在Android中绘制叠加(系统范围)

Question

有没有办法在任何Android应用程序之上绘制一个覆盖窗口？

我使用Android x86端口并拥有系统权限.

@Edit:叠加层下面的视图应该接收所有事件.

Answer 1

可以通过创建一个Service在当前添加视图的方式来实现WindowManager:

public class OverlayService extends Service {

    @Override
    public void onCreate() {
        super.onCreate();

        WindowManager windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);

        View overlay = /* create your overlay here */;

        WindowManager.LayoutParams params = new WindowManager.LayoutParams(
            WindowManager.LayoutParams.WRAP_CONTENT,
            WindowManager.LayoutParams.WRAP_CONTENT,
            WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
            WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
            PixelFormat.TRANSLUCENT);
        windowManager.addView(overlay , params);
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }   
}

但是你需要这个额外的许可:

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

然后只需在清单中注册服务:

<service android:name=".OverlayService" ></service>

然后开始吧:

startService(new Intent(this, OverlayService.class));