Facebook Sdk Has Not Been Initialized FacebookSdk.sdkInitialize()

You don't need to use FacebookSdk.sdkInitialize anymore. Check if your:

<meta-data android:name="com.facebook.sdk.ApplicationId"
            android:value="@string/facebook_app_id"/>

is inside <application> tag.

You have to use FacebookSdk.sdkInitialize(getApplicationContext()); before setContentView(R.layout.activity_main); as documentation states out. In case you need a complete facebook login example, check this one here.

Problem

While integrating Android SDK for a react-native project, I had finished the Android with React Native v0.30+ Project Configuration guide, and ran react-native run-android and then got this screen:

I learned that FacebookSdk.sdkInitialize is deprecated. see here

After some searching, I realized that the guide did not contain the steps to add the Facebook App ID for my app.

Solution

1. Open android/app/src/main/AndroidManifest.xml file and look in the <application> tag to confirm that this meta-data tag exists:

   <meta-data android:name="com.facebook.sdk.ApplicationId"
             android:value="@string/facebook_app_id"/>
   

2. Open android/app/src/main/res/values/strings.xml file and confirm that this there is a "facebook_app_id" string tag with your app id as the value:

   <string name="facebook_app_id">YOUR_APP_ID_HERE</string>
   

3. Run react-native run-android.

These are the steps that worked for me.