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    <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&amp;hl=en" rel="nofollow">AirCalc</a>.</p>
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    1. POHow can one detect screen gestures outside ones own app?
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    1. POHow can one detect screen gestures outside ones own app?
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    1. COThe app I link to above doesn't have any persistent notification in the status bar (as per the description in the docs)... is it possible that they're doing it some other way? Or is having your foreground Service put an icon in the status bar a recommended option that you can skip?
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    2. COit doesn't? weird. i can clearly see in all of the screenshots that it has a notification (with 4 squares). are you sure about this?
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    3. COIf we're talking about https://play.google.com/store/apps/details?id=com.shere.easycontroller&hl=en then yeah, no notification. However I'm looking at it on my 4.0.3 device (don't have the 4.3 device handy this second), so perhaps the status bar requirement was introduced later?
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