Remove attempt at setFlushOnBackground for android

Author: jakecronin

android/src/main/java/com/mixpanel/reactnative/MixpanelReactNativeModule.java

@@ -67,15 +67,6 @@ public void setLoggingEnabled(final String token, boolean enableLogging, Promise
         }
     }
 
-    @ReactMethod
-    public void setFlushOnBackground(final String token, boolean flushOnBackground, Promise promise) throws JSONException {
-        MixpanelAPI instance = MixpanelAPI.getInstance(this.mReactContext, token);
-        synchronized (instance) {
-            instance.setFlushOnBackground(flushOnBackground);
-            promise.resolve(null);
-        }
-    }
-
     @ReactMethod
     public void hasOptedOutTracking(final String token, Promise promise) {
         MixpanelAPI instance = MixpanelAPI.getInstance(this.mReactContext, token);

index.js

@@ -107,14 +107,18 @@ export class Mixpanel {
     }
 
      /**
-     * This allows enabling or disabling whether or not Mixpanel flushes events.
-     * when the app enters the background. This is set to true by default. 
+     * This allows enabling or disabling whether or not Mixpanel flushes events
+     * when the app enters the background on iOS. This is set to true by default. 
      *
      * @param {boolean} flushOnBackground whether to enable logging
      *
      */
     setFlushOnBackground(flushOnBackground) {
-        MixpanelReactNative.setFlushOnBackground(this.token, flushOnBackground);
+        if (Platform.OS === 'ios') {
+            MixpanelReactNative.setFlushOnBackground(this.token, flushOnBackground);
+        } else {
+            console.warn('Mixpanel setFlushOnBackground was called and ignored because this method only works on iOS.')
+        }
     }
 
     /**