How to handle SYSTEM_ALERT_WINDOW permission not being auto-granted on some pre-Marshmallow devices

Question

I\'ve been getting reports of some Xiaomi devices (e.g. Mi 2, running API level 21) not showing overlays. My app targets API 23.

There are several posts out there r

Answer 1

For searching for while about the issue in Xiaomi, Meizu I have found this. It's working perfectly..

public static boolean isMiuiFloatWindowOpAllowed(@NonNull Context context) {
    final int version = Build.VERSION.SDK_INT;

    if (version >= 19) {
        return checkOp(context, OP_SYSTEM_ALERT_WINDOW); //See AppOpsManager.OP_SYSTEM_ALERT_WINDOW=24 /*@hide/
    } else {
        return (context.getApplicationInfo().flags & 1<<27) == 1;
    }
}

public static boolean checkOp(Context context, int op, String packageName, int uid) {
    final int version = Build.VERSION.SDK_INT;

    if (version >= 19) {
        AppOpsManager manager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
        try {
            return (AppOpsManager.MODE_ALLOWED == (Integer) ReflectUtils.invokeMethod(manager, "checkOp", op, uid, packageName));
        } catch (Exception e) {
            e.printStackTrace();
        }
    } else {
        Flog.e("Below API 19 cannot invoke!");
    }
    return false;
}

ReflectUtils.java

public static Object invokeMethod(@NonNull Object receiver, String methodName, Object... methodArgs) throws Exception {
Class[] argsClass = null;
    if (methodArgs != null && methodArgs.length != 0) {
        int length = methodArgs.length;
        argsClass = new Class[length];
        for (int i=0; i

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