add checkPermissions for Android

Author: riwu

README.md

@@ -317,9 +317,16 @@ Uses the [ShortcutBadger](https://github.com/leolin310148/ShortcutBadger) on And
 ## Sending Notification Data From Server
 Same parameters as `PushNotification.localNotification()`
 
-## iOS Only Methods
+## Checking Notification Permissions
 `PushNotification.checkPermissions(callback: Function)` Check permissions
 
-`PushNotification.getApplicationIconBadgeNumber(callback: Function)` get badge number
+`callback` will be invoked with a `permissions` object:
+- `alert`: boolean
+- `badge`: boolean
+- `sound`: boolean
+
+## iOS Only Methods
+
+`PushNotification.getApplicationIconBadgeNumber(callback: Function)` Get badge number
 
 `PushNotification.abandonPermissions()` Abandon permissions

android/src/main/java/com/dieam/reactnativepushnotification/modules/RNPushNotification.java

@@ -8,6 +8,7 @@
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.Bundle;
+import android.support.v4.app.NotificationManagerCompat;
 
 import com.dieam.reactnativepushnotification.helpers.ApplicationBadgeHelper;
 import com.facebook.react.bridge.ActivityEventListener;
@@ -105,6 +106,13 @@ public void onReceive(Context context, Intent intent) {
         }, intentFilter);
     }
 
+    @ReactMethod
+    public void checkPermissions(Promise promise) {
+        ReactContext reactContext = getReactApplicationContext();
+        NotificationManagerCompat managerCompat = NotificationManagerCompat.from(reactContext);
+        promise.resolve(managerCompat.areNotificationsEnabled());
+    }
+
     @ReactMethod
     public void requestPermissions(String senderID) {
         ReactContext reactContext = getReactApplicationContext();

component/index.android.js

@@ -58,7 +58,7 @@ NotificationsComponent.prototype.abandonPermissions = function() {
 };
 
 NotificationsComponent.prototype.checkPermissions = function(callback: Function) {
-	/* Void */
+	RNPushNotification.checkPermissions().then(alert => callback({ alert }));
 };
 
 NotificationsComponent.prototype.addEventListener = function(type: string, handler: Function) {