[admob][android] Add initialize method + documentation

android/src/main/java/io/invertase/firebase/admob/RNFirebaseAdMob.java

@@ -7,13 +7,11 @@ import android.util.Log;
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReactContextBaseJavaModule;
 import com.facebook.react.bridge.ReactMethod;
-import com.facebook.react.bridge.ReadableArray;
 import com.facebook.react.bridge.ReadableMap;
 import com.google.android.gms.ads.AdRequest;
-import io.invertase.firebase.Utils;
+import com.google.android.gms.ads.MobileAds;
 
 import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 
 
@@ -31,7 +29,6 @@ public class RNFirebaseAdMob extends ReactContextBaseJavaModule {
 
   private HashMap<String, RNFirebaseAdmobInterstitial> interstitials = new HashMap<>();
   private HashMap<String, RNFirebaseAdMobRewardedVideo> rewardedVideos = new HashMap<>();
-  private HashMap<String, RNFirebaseAdMobNativeExpress> nativeExpressAds = new HashMap<>();
 
   public RNFirebaseAdMob(ReactApplicationContext reactContext) {
     super(reactContext);
@@ -43,6 +40,11 @@ public class RNFirebaseAdMob extends ReactContextBaseJavaModule {
     return TAG;
   }
 
+  @ReactMethod
+  public void initialize(String appId) {
+    MobileAds.initialize(this.getContext(), appId);
+  }
+
   @ReactMethod
   public void interstitialLoadAd(String adUnit, ReadableMap request) {
     RNFirebaseAdmobInterstitial interstitial = getOrCreateInterstitial(adUnit);

docs/modules/admob.md

@@ -1,8 +1,17 @@
 # AdMob
 
-The admob allows you to display adverts in your app, using your account from [AdMob by Google](https://www.google.co.uk/admob/).
+The admob allows you to display adverts in your app, using your account from [AdMob by Google](https://www.google.co.uk/admob/). RNFirebase allows you to display Banners, Interstitials, NativeExpress Ads & Rewarded Videos.
 
-RNFirebase allows you to display Banners, Interstitials, NativeExpress Ads & Rewarded Videos.
+## Initialize
+
+Before using any AdMob feature, ensure you call the initialize method. This only needs to be done once per the apps lifecycle.
+Initialize takes your AdMob App ID, where you can find on your AdMob dashboard.
+
+> For testing purposes, you can use AdMobs test app ID "ca-app-pub-3940256099942544~3347511713".
+
+```js
+firebase.admob().initialize("ca-app-pub-3940256099942544~3347511713");
+```
 
 ## API
 

lib/modules/admob/AdMobComponent.js

@@ -61,7 +61,6 @@ class AdMobComponent extends React.Component {
    * @param nativeEvent
    */
   onBannerEvent = ({ nativeEvent }) => {
-    console.log(nativeEvent)
     if (this.props[nativeEvent.type]) {
       if (nativeEvent.type === 'onAdFailedToLoad') {
         const { code, message } = nativeEvent.payload;

lib/modules/admob/index.js

@@ -20,6 +20,7 @@ export default class Admob extends Base {
       return nativeSDKMissing('admob');
     }
 
+    this._initialized = false;
     FirebaseAdMobEvt.addListener('interstitial_event', this._onInterstitialEvent.bind(this));
     FirebaseAdMobEvt.addListener('rewarded_video_event', this._onRewardedVideoEvent.bind(this));
   }
@@ -46,6 +47,16 @@ export default class Admob extends Base {
     this.emit(jsEventType, event);
   }
 
+  initialize(appId: string) {
+    if (this._initialized) {
+      this.log.warn('AdMob has already been initialized!');
+      return;
+    }
+
+    this._initialized = true;
+    return FirebaseAdMob.initialize(appId);
+  }
+
   interstitial(adUnit: string) {
     return new Interstitial(this, adUnit);
   }