fix(admob, android): unity ads require Activity Context (#4921)

* fix unity mediation 

Unity Ads requires an Activity context to load ads.

* fix adContext for interstitial ad

* fall back to applicationContext

* reuse activity var, remove context fallback on null activity

Author: zyzo

packages/admob/android/src/main/java/io/invertase/firebase/admob/ReactNativeFirebaseAdMobInterstitialModule.java

@@ -17,6 +17,7 @@
  *
  */
 
+import android.app.Activity;
 import android.util.SparseArray;
 
 import com.facebook.react.bridge.Arguments;
@@ -63,15 +64,16 @@ private void sendInterstitialEvent(String type, int requestId, String adUnitId,
 
   @ReactMethod
   public void interstitialLoad(int requestId, String adUnitId, ReadableMap adRequestOptions) {
-    if (getCurrentActivity() == null) {
+    Activity currentActivity = getCurrentActivity();
+    if (currentActivity == null) {
       WritableMap error = Arguments.createMap();
       error.putString("code", "null-activity");
       error.putString("message", "Interstitial ad attempted to load but the current Activity was null.");
       sendInterstitialEvent(AD_ERROR, requestId, adUnitId, error);
       return;
     }
-    getCurrentActivity().runOnUiThread(() -> {
-      InterstitialAd interstitialAd = new InterstitialAd(getApplicationContext());
+    currentActivity.runOnUiThread(() -> {
+      InterstitialAd interstitialAd = new InterstitialAd(currentActivity);
       interstitialAd.setAdUnitId(adUnitId);
 
       // Apply AdRequest builder

packages/admob/android/src/main/java/io/invertase/firebase/admob/ReactNativeFirebaseAdMobRewardedModule.java

@@ -1,5 +1,6 @@
 package io.invertase.firebase.admob;
 
+import android.app.Activity;
 import android.util.SparseArray;
 
 import androidx.annotation.NonNull;
@@ -51,15 +52,16 @@ private void sendRewardedEvent(String type, int requestId, String adUnitId, @Nul
 
   @ReactMethod
   public void rewardedLoad(int requestId, String adUnitId, ReadableMap adRequestOptions) {
-    if (getCurrentActivity() == null) {
+    Activity activity = getCurrentActivity();
+    if (activity == null) {
       WritableMap error = Arguments.createMap();
       error.putString("code", "null-activity");
       error.putString("message", "Rewarded ad attempted to load but the current Activity was null.");
       sendRewardedEvent(AD_ERROR, requestId, adUnitId, error, null);
       return;
     }
-    getCurrentActivity().runOnUiThread(() -> {
-      RewardedAd rewardedAd = new RewardedAd(getApplicationContext(), adUnitId);
+    activity.runOnUiThread(() -> {
+      RewardedAd rewardedAd = new RewardedAd(activity, adUnitId);
 
       RewardedAdLoadCallback adLoadCallback = new RewardedAdLoadCallback() {
         @Override