Add canRequest to Android

Author: nan-li

android/src/main/java/com/onesignal/flutter/OneSignalNotifications.java

@@ -52,6 +52,8 @@ static void registerWith(BinaryMessenger messenger) {
     public void onMethodCall(MethodCall call, Result result) {
     if (call.method.contentEquals("OneSignal#permission"))
         replySuccess(result, OneSignal.getNotifications().getPermission());
+    else if (call.method.contentEquals("OneSignal#canRequest"))
+        replySuccess(result, OneSignal.getNotifications().getCanRequestPermission());
     else if (call.method.contentEquals("OneSignal#requestPermission"))
         this.requestPermission(call, result);
     else if (call.method.contentEquals("OneSignal#removeNotification"))

lib/src/notifications.dart

@@ -59,11 +59,7 @@ class OneSignalNotifications {
   /// Whether attempting to request notification permission will show a prompt.
   /// Returns true if the device has not been prompted for push notification permission already.
   Future<bool> canRequest() async {
-    if (Platform.isIOS) {
-      return await _channel.invokeMethod("OneSignal#canRequest");
-    } else {
-      return false;
-    }
+    return await _channel.invokeMethod("OneSignal#canRequest");
   }
 
   /// Removes a single notification.