Essential Books

Granting SYSTEM ALERT WINDOW Permission on android 6.0 and above

suggest change

From android 6.0 this permission needs to grant dynamically, 

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

Throwing below permission denied error on 6.0, 

Caused by: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@86fb55b -- permission denied for this window type

Solution :-

Requesting Overlay permission as below, 

if(!Settings.canDrawOverlays(this)){
    // ask for setting 
     Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
     Uri.parse("package:" + getPackageName()));
     startActivityForResult(intent, REQUEST_OVERLAY_PERMISSION);
}

Check for the result, 

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_OVERLAY_PERMISSION) {
        if (Settings.canDrawOverlays(this)) {
            // permission granted...
        }else{
            // permission not granted...
        }
    }
}
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Creating Overlay always-on-top Windows:
* Creating Overlay always-on-top Windows
* Popup overlay
* Granting SYSTEM ALERT WINDOW Permission on android 6.0 and above
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162 Creating Overlay always-on-top Windows
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266 Getting system font names
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