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copied!<p>there are 2 things you have to handle:</p> <ol> <li><p>showing a view on top. for this, you need to use a special permission <a href="http://developer.android.com/reference/android/view/WindowManager.LayoutParams.html#TYPE_SYSTEM_ALERT" rel="nofollow">TYPE_SYSTEM_ALERT</a> . here's a code for showing a view on top:</p> <blockquote> <pre><code>final WindowManager.LayoutParams param=new WindowManager.LayoutParams(); param.flags=WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE; final View view=findViewById(R.id.view1); final ViewGroup parent=(ViewGroup)view.getParent(); if(parent!=null) parent.removeView(view); param.format=PixelFormat.RGBA_8888; param.type=WindowManager.LayoutParams.TYPE_SYSTEM_ALERT; param.gravity=Gravity.TOP|Gravity.LEFT; param.width=view.getLayoutParams().width; param.height=view.getLayoutParams().height; final WindowManager wmgr=(WindowManager)getApplicationContext().getSystemService(Context.WINDOW_SERVICE); wmgr.addView(view,param); // TODO handle overlapping title bar and/or action bar // TODO you must add logic to remove the view // TODO you must use a special permission to use this method :android.permission.SYSTEM_ALERT_WINDOW </code></pre> </blockquote></li> <li><p>keeping the app alive. for this, you need to create a service that runs in the foreground, which means it uses a notification. <a href="http://developer.android.com/guide/components/services.html#Foreground" rel="nofollow">here's a link</a>.</p></li> </ol> <p>there are plenty of apps that have this ability. the first one i've seen was <a href="https://play.google.com/store/apps/details?id=com.myboyfriendisageek.aircalc&hl=en" rel="nofollow">AirCalc</a>.</p>

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