Facebook Login in Android

Integrate the Facebook SDK

The Facebook Login SDK for Android is a component of the Facebook SDK for Android. To use the Facebook Login SDK in your project, make it a dependency in Maven, or download it. Choose the method you prefer with the following button.

1. Go to Android Studio | New Project | Minimum SDK
2. Select "API 15: Android 4.0.3" or higher and create your new project.
3. In your project, open your_app | Gradle Scripts | build.gradle
4. Add the Maven Central Repository to build.gradle before dependencies:
   repositories { mavenCentral() }
5. Add compile 'com.facebook.android:facebook-android-sdk:[4,5)' to your build.gradle dependencies.

Using Maven

1. In your project, open your_app > Gradle Scripts > build.gradle (Project) make sure the following repository is listed in the buildscript { repositories {}}:

   jcenter() 

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2. In your project, open your_app > Gradle Scripts > build.gradle (Module: app) and add the following implementation statement to the dependencies{} section to depend on the latest version of the Facebook Login SDK:

    implementation 'com.facebook.android:facebook-login:[5,6)'

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3. Build your project.

string.xml

       <string name="facebook_app_id">XXXXXXXXXXXXX</string>
       <string name="fb_login_protocol_scheme">fb22XXXXXX60580447282</string>

menifest.xml

//permission

<uses-permission android:name="android.permission.INTERNET"/>

//applicaltion tag

<activity android:name="com.facebook.FacebookActivity"
    android:configChanges=
            "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
    android:label="@string/app_name" />
<activity
    android:name="com.facebook.CustomTabActivity"
    android:exported="true">
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />
        <data android:scheme="@string/fb_login_protocol_scheme" />
    </intent-filter>
</activity>

Initialization of CallBackManager And Button.

    CallbackManager  callbackManager = CallbackManager.Factory.create();
    Button loginButton = (Button) findViewById(R.id.facebook);
    loginButton.setOnClickListener(this);

And use this facebookIntegration() method in your onClick method.

  private void facebookIntegration() {
    
    LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList("email"));
    //  LoginButton.setLoginBehavior(LoginBehavior.WEB_ONLY);
    LoginManager.getInstance().registerCallback(callbackManager,
            new FacebookCallback<LoginResult>() {
                @Override
                public void onSuccess(LoginResult loginResult) {
                    // App code
                    
                    Bundle facebookBundle = getFacebookData(loginResult.getAccessToken());
                    
                }
                
                @Override
                public void onCancel() {
                    //  Log.d("sam", "cancel");
                    // App code
                }
                
                @Override
                public void onError(FacebookException exception) {
                    // Log.d("sam", new Gson().toJson(exception));
                    // App code
                }
            });
}

private Bundle getFacebookData(final AccessToken token) {
    final Bundle facebookBundle = new Bundle();
    facebookBundle.putString("fields", "id,name,email");
    
    GraphRequest request = GraphRequest.newMeRequest(token,
            new GraphRequest.GraphJSONObjectCallback() {
                
                @Override
                public void onCompleted(JSONObject object, GraphResponse response) {
                    String name = "", email = "", id = "";
                    try {
                        name = object.getString("name");
                    } catch (JSONException e) {
                        name = "";
                        e.printStackTrace();
                        
                    }
                    
                    try {
                        email = object.getString("email");
                    } catch (JSONException e) {
                        email = "";
                        e.printStackTrace();
                        
                    }
                    
                    try {
                        id = object.getString("id");
                    } catch (JSONException e) {
                        id = "";
                        e.printStackTrace();
                        
                    }
                    
                    Log.d("sam", name + " " + email + " "+ id);
                    
                    Log.d("sam", "Object = " + object.toString());
                    
                }
            });
    request.setParameters(facebookBundle);
    request.executeAsync();
    
    
    return facebookBundle;
 }

And use your callbackManager.onActivityResult() method of your activity or fragment onActivityResult method.

@Override
   public void onActivityResult(int requestCode, int resultCode, Intent data) {
     callbackManager.onActivityResult(requestCode, resultCode, data);
     super.onActivityResult(requestCode, resultCode, data);
  }

Note: Please Config your manifest and Gradle before using this code.

That is all. If any help related to this post please comment.

Thank you, guys. 

Enjoy coding.