Android facebook login email

To implement Facebook login in an Android app using the Facebook SDK, you'll need to follow these steps:

Step 1: Create a Facebook Developer Account and App

1. Go to the Facebook for Developers website and create a new account if you don't already have one.
2. Create a new app by clicking on "Add New App" and filling out the required information.
3. Note down the App ID and App Secret, you'll need them later.

Step 2: Add Facebook SDK to Your Android Project

1. Add the Facebook SDK to your Android project by adding the following dependency to your build.gradle file:

   dependencies {
    implementation 'com.facebook.android:facebook-android-sdk:8.2.0'
   }

2. Sync your project with Gradle files.

Step 3: Configure Facebook SDK

1. Create a new file called FacebookConfig.java and add the following code:

   public class FacebookConfig {
    public static final String APP_ID = "YOUR_APP_ID";
    public static final String APP_SECRET = "YOUR_APP_SECRET";
   }

   Replace YOUR_APP_ID and YOUR_APP_SECRET with the values you noted down in Step 1.

2. Create a new file called FacebookLoginActivity.java and add the following code:

   public class FacebookLoginActivity extends AppCompatActivity {
    private FacebookCallback<LoginResult> callback = new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            // Login successful, get the user's email
            GraphRequest request = GraphRequest.newMeRequest(
                    loginResult.getAccessToken(),
                    new GraphRequest.GraphJSONObjectCallback() {
                        @Override
                        public void onCompleted(JSONObject object, GraphResponse response) {
                            try {
                                String email = object.getString("email");
                                // Use the email to login or register the user
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }
                    });
            request.executeAsync();
        }
   
        @Override
        public void onCancel() {
            // Login cancelled
        }
   
        @Override
        public void onError(FacebookException e) {
            // Login error
        }
    };
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        FacebookSdk.sdkInitialize(this);
        callbackManager = CallbackManager.Factory.create();
        loginButton = (LoginButton) findViewById(R.id.login_button);
        loginButton.setReadPermissions("email");
        loginButton.registerCallback(callbackManager, callback);
    }
   
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        callbackManager.onActivityResult(requestCode, resultCode, data);
    }
   }

   Step 4: Add Facebook Login Button to Your Layout

3. Add a LoginButton to your layout file (activity_main.xml for example):

   <com.facebook.login.widget.LoginButton
    android:id="@+id/login_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="16dp" />

   Step 5: Start the Facebook Login Activity

4. Start the FacebookLoginActivity when the user clicks the login button:

   loginButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent intent = new Intent(FacebookLoginActivity.this, FacebookLoginActivity.class);
        startActivity(intent);
    }
   });

   That's it! With these steps, you should now have a basic Facebook login implementation in your Android app.