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POCreating a system overlay window (always on top)
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copied!<p>I'm trying to create an always-op-top button/clickable-image which stays on top of all the windows all the time. </p> <p>The proof of concept is </p> <ul> <li>here - <a href="http://www.appbrain.com/app/smart-taskbar-%28sidebar%29/com.smart.taskbar" rel="noreferrer">Smart Taskbar (on AppBrain)</a></li> <li>and here <a href="http://forum.xda-developers.com/showthread.php?t=865525" rel="noreferrer">V1.4.0 Sidebar style SWKey - Button savior (on xda-developers)</a> </li> </ul> <p>I have been successful and have a running service now. The service displays some text on top left corner of screen all the time while user can freely interact with rest of apps in normal manner. </p> <p>What I'm doing is subclass <code>ViewGroup</code> and add it to root window manager with flag <code>TYPE_SYSTEM_OVERLAY</code>. Now I want to add a button/clickable-image in place of this text which can receive touch events on itself. I tried overriding "onTouchEvent" for the whole <code>ViewGroup</code> but it does not receive any event. </p> <p>How can I receive events only on certain parts of my always-on-top view group? Kindly suggest.</p> <pre><code>public class HUD extends Service { HUDView mView; @Override public IBinder onBind(Intent intent) { return null; } @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.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY, 0, // WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE // | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE, PixelFormat.TRANSLUCENT); params.gravity = Gravity.RIGHT | Gravity.TOP; params.setTitle("Load Average"); WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE); wm.addView(mView, params); } @Override public void onDestroy() { super.onDestroy(); Toast.makeText(getBaseContext(),"onDestroy", Toast.LENGTH_LONG).show(); if(mView != null) { ((WindowManager) getSystemService(WINDOW_SERVICE)).removeView(mView); mView = null; } } } class HUDView extends ViewGroup { private Paint mLoadPaint; public HUDView(Context context) { super(context); Toast.makeText(getContext(),"HUDView", Toast.LENGTH_LONG).show(); mLoadPaint = new Paint(); mLoadPaint.setAntiAlias(true); mLoadPaint.setTextSize(10); mLoadPaint.setARGB(255, 255, 0, 0); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawText("Hello World", 5, 15, mLoadPaint); } @Override protected void onLayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) { } @Override public boolean onTouchEvent(MotionEvent event) { //return super.onTouchEvent(event); Toast.makeText(getContext(),"onTouchEvent", Toast.LENGTH_LONG).show(); return true; } } </code></pre>

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