Settings.canDrawOverlays is returning false even after turning the permission on from settings

Question

I am trying billow Code from this answer to check if the permission is enabled. but it is returning false even when the permission is enabled from the settings.

public static boolean canDrawOverlayViews(Context con){
    if(Build.VERSION.SDK_INT< Build.VERSION_CODES.LOLLIPOP){return true;}
    try {
        return Settings.canDrawOverlays(con);
    }
    catch(NoSuchMethodError e){
        return canDrawOverlaysUsingReflection(con);
    }
}


public static boolean canDrawOverlaysUsingReflection(Context context) {

    try {

        AppOpsManager manager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
        Class clazz = AppOpsManager.class;
        Method dispatchMethod = clazz.getMethod("checkOp", new Class[] { int.class, int.class, String.class });
        //AppOpsManager.OP_SYSTEM_ALERT_WINDOW = 24
        int mode = (Integer) dispatchMethod.invoke(manager, new Object[] { 24, Binder.getCallingUid(), context.getApplicationContext().getPackageName() });

        return AppOpsManager.MODE_ALLOWED == mode;

    } catch (Exception e) {  return false;  }

}

Answer 1

Recently I've also faced the same issue and got the following workaround . Referenced from https://code.google.com/p/android/issues/detail?id=198671#c7

public boolean getWindoOverLayAddedOrNot2() {

   String sClassName = "android.provider.Settings";
   try {
       Class classToInvestigate = Class.forName(sClassName);
       if (context == null)
           context = activity;
       Method method = classToInvestigate.getDeclaredMethod("isCallingPackageAllowedToDrawOverlays", Context.class, int.class, String.class, boolean.class);
       Object value = method.invoke(null, context, Process.myUid(), context.getPackageName(), false);

       Log.i("Tag", value.toString());
       // Dynamically do stuff with this class
       // List constructors, fields, methods, etc.

   } catch (ClassNotFoundException e) {
       // Class not found!
   } catch (Exception e) {
       // Unknown exception
       e.printStackTrace();
   }

   return false;
}