Type_System_Overlay in Ics

TYPE_SYSTEM_OVERLAY in ICS

Everything you describe is true. It is presumably to tighten up security, as the former behavior was the source of tapjacking attacks. I wrote a blog post recently about this change.

Any idea's?

Don't use either of them.

TYPE_SYSTEM_OVERLAY detect touches in ICS

It seems this is just the case, as this post highlights. This is generally a bad idea, see the documentation:

These windows must not take input focus, or they will interfere with the keyguard.

I haven't actually tested those overlays on Android 4.0 ICS but other apps like SwipePad seem to do this just fine. The only concern I am aware of is related to performance, such overlays often take a hefty toll on the device. If you want to accurately detect touch input and the overlay does not have to be above the lock screen, try TYPE_SYSTEM_ALERT. Another post on SO seems to have chosen that type as well.

TYPE_SYSTEM_OVERLAY in Android 4 ICS

I see that TYPE_SYSTEM_ALERT still works on ICS and I need to come up with a solution using this flag.

Full screen overlay in ICS

I know only solution with replacing TYPE_SYSTEM_ALERT to TYPE_SYSTEM_OVERLAY. But in this way your window will not receive touch events.

Could not get Touch event for TYPE_SYSTEM_OVERLAY

To hide the view you need to call mWindowManager.removeView(mOverlay);

private RelativeLayout mOverlay;
        private WindowManager mWindowManager;   
     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_TOUCH_MODAL,
                        PixelFormat.TRANSLUCENT);
                params.gravity = Gravity.TOP;
                LayoutInflater inflater = (LayoutInflater) context
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                mOverlay = (RelativeLayout) inflater
                        .inflate(R.layout.phasechange, null);

                mWindowManager = (WindowManager) context
                        .getSystemService(Context.WINDOW_SERVICE);
                mWindowManager.addView(mOverlay, params);
                Button b = (Button) mOverlay.findViewById(R.id.button1);
                b.setOnClickListener(new OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                        mWindowManager.removeView(mOverlay);
                    }
                });

            }

Creating a system overlay window (always on top)

This might be a stupid solution. But it works. If you can improve it, please let me know.

OnCreate of your Service: I have used WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH flag. This is the only change in service.

@Override
    public void onCreate() {
        super.onCreate();
        Toast.makeText(getBaseContext(),"onCreate", Toast.LENGTH_LONG).show();
        mView = new HUDView(this);
        WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
                WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
                PixelFormat.TRANSLUCENT);
        params.gravity = Gravity.RIGHT | Gravity.TOP;
        params.setTitle("Load Average");
        WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
        wm.addView(mView, params);
    }

Now, you will start getting each and every click event. So, you need to rectify in your event handler.

In your ViewGroup touch event

@Override
public boolean onTouchEvent(MotionEvent event) {

    // ATTENTION: GET THE X,Y OF EVENT FROM THE PARAMETER
    // THEN CHECK IF THAT IS INSIDE YOUR DESIRED AREA

    Toast.makeText(getContext(),"onTouchEvent", Toast.LENGTH_LONG).show();
    return true;
}

Also you may need to add this permission to your manifest:

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

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