feat(android): potentially improves mediation performance for banners (…

…#527)

android/src/main/java/io/invertase/googlemobileads/ReactNativeGoogleMobileAdsBannerAdViewManager.java

@@ -182,19 +182,18 @@ private BaseAdView initAdView(ReactNativeAdView reactViewGroup) {
       oldAdView.destroy();
       reactViewGroup.removeView(oldAdView);
     }
-    BaseAdView adView;
-    if (ReactNativeGoogleMobileAdsCommon.isAdManagerUnit(reactViewGroup.getUnitId())) {
-      Activity currentActivity = ((ReactContext) reactViewGroup.getContext()).getCurrentActivity();
-      if (currentActivity != null) {
-        // in order to display the debug menu for GAM ads we need the activity context
-        // https://github.com/invertase/react-native-google-mobile-ads/issues/188
-        adView = new AdManagerAdView(currentActivity);
-      } else {
-        return null;
-      }
-    } else {
-      adView = new AdView(reactViewGroup.getContext());
-    }
+
+    // For optimal mediation performance ad objects should be initialized with
+    // activity, rather than just context:
+    // https://developers.google.com/admob/android/mediation#initialize_your_ad_object_with_an_activity_instance
+    Activity currentActivity = ((ReactContext) reactViewGroup.getContext()).getCurrentActivity();
+    if (currentActivity == null) return null;
+
+    BaseAdView adView =
+        ReactNativeGoogleMobileAdsCommon.isAdManagerUnit(reactViewGroup.getUnitId())
+            ? new AdManagerAdView(currentActivity)
+            : new AdView(currentActivity);
+
     adView.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
     adView.setOnPaidEventListener(
         new OnPaidEventListener() {