react-native android Facebook login

A react-native android Facebook login setup.md

React-native Android Facebook login implementation

Many thanks to @satya164 and this thread for getting things moving.

##Setup your app on Facebook

• The quickstart is the best way to get everything you need (keys, hashes etc). Make sure to generate your Key Hash or else login will not work! https://developers.facebook.com/quickstarts/?platform=android

#####Make sure to Set your app to public or else you will have to assing test users (cannot be yourself)

#####Add the Facebook SDK to your android/app/build.gradle under dependencies:

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.0.1'
    compile 'com.facebook.react:react-native:0.12.+'
    compile 'com.facebook.android:facebook-android-sdk:4.7.0'   // <---- add this
}

#####Make sure mavenLocal() is under the main android/build.gradle

allprojects {
    repositories {
        mavenLocal()    <---  add this if its not there already  *****
        jcenter()
    }
}

#####Add / modify all the files in this gist as indicated

#####Add a NativeModules js module to your project (FacebookLoginModule.android.js below)

#####Create a react-native view that exposes the .pickAccount() method of FacebookLoginModule.android.js, for es:

var FacebookLogin = require('./FacebookLoginModule.android');

    ...
    
    _onFacebookPress() {
        FacebookLogin.pickAccount(e => this._onSignIn(e))
    }

    ...

    <TouchableHighlight onPress={this._onFacebookPress}>  ... </TouchableHighlight>

#####Build and run your project

On login, you will recieve the following response:

Now you are ready to build, run, repeat, and enjoy!

I was experiencing a strange error about my Key Hashes not matching what I had generated for Facebook, but I simply copied the hash from the error message and added to FB, and the error was resolved.

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.yourApp">

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

    <application
            android:allowBackup="true"
            android:label="@string/app_name"
            android:icon="@mipmap/ic_launcher"
            android:theme="@style/AppTheme">
        <activity
                android:name=".MainActivity"
                android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>

        <!--add com.facebook.FacebookActivity-->
        <activity
                android:name="com.facebook.FacebookActivity"
                android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
                android:label="@string/app_name"
                android:theme="@android:style/Theme.Translucent.NoTitleBar"/>

        <!--reference your fb_app_id-->
        <meta-data
                android:name="com.facebook.sdk.ApplicationId"
                android:value="@string/fb_app_id"/>

        <activity android:name="com.facebook.react.devsupport.DevSettingsActivity"/>
    </application>

</manifest>

FacebookLoginModule.android.js

const React = require('react-native');
const { NativeModules } = React;
const { FacebookLoginModule } = NativeModules;

module.exports = FacebookLoginModule;

//exposes @ReactMethod methods .pickAccount() and .getCurrentToken() via FacebookLoginModule.java

FacebookLoginModule.java

//add to the same directory as MainActivity.java

package com.yourApp;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;

import com.facebook.AccessToken;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.FacebookRequestError;
import com.facebook.FacebookSdk;
import com.facebook.GraphRequest;
import com.facebook.GraphResponse;
import com.facebook.login.LoginManager;
import com.facebook.login.LoginResult;
import com.facebook.react.bridge.Arguments;
import com.facebook.react.bridge.Callback;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.bridge.WritableMap;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.Arrays;
import java.util.Date;

public class FacebookLoginModule extends ReactContextBaseJavaModule {

    private final String CALLBACK_TYPE_SUCCESS = "success";
    private final String CALLBACK_TYPE_ERROR = "error";
    private final String CALLBACK_TYPE_CANCEL = "cancel";

    private Context mActivityContext;
    private CallbackManager mCallbackManager;
    private Callback mTokenCallback;

    public FacebookLoginModule(ReactApplicationContext reactContext, Context activityContext) {
        super(reactContext);

        mActivityContext = activityContext;

        FacebookSdk.sdkInitialize(activityContext.getApplicationContext());

        mCallbackManager = CallbackManager.Factory.create();

        LoginManager.getInstance().registerCallback(mCallbackManager,
                new FacebookCallback<LoginResult>() {

                    @Override
                    public void onSuccess(final LoginResult loginResult) {
                        GraphRequest.newMeRequest(loginResult.getAccessToken(), new GraphRequest.GraphJSONObjectCallback() {
                                    @Override
                                    public void onCompleted(JSONObject me, GraphResponse response) {
                                        if (mTokenCallback != null) {

                                            FacebookRequestError error = response.getError();

                                            if (error != null) {

                                                WritableMap map = Arguments.createMap();
                                                map.putString("errorType", error.getErrorType());
                                                map.putString("message", error.getErrorMessage());
                                                map.putString("recoveryMessage", error.getErrorRecoveryMessage());
                                                map.putString("userMessage", error.getErrorUserMessage());
                                                map.putString("userTitle", error.getErrorUserTitle());
                                                map.putInt("code", error.getErrorCode());
                                                consumeCallback(CALLBACK_TYPE_ERROR, map);

                                            } else {

                                                WritableMap map = Arguments.createMap();
                                                System.out.println("Success");
                                                String jsonresult = String.valueOf(me);
                                                System.out.println("JSON Result" + jsonresult);
                                                map.putString("email", me.optString("email"));
                                                map.putString("token", loginResult.getAccessToken().getToken());
                                                map.putString("expiration", String.valueOf(loginResult.getAccessToken().getExpires()));
                                                consumeCallback(CALLBACK_TYPE_SUCCESS, map);
                                            }
                                        } else {

                                            WritableMap map = Arguments.createMap();
                                            map.putString("message", "Insufficient permissions");
                                            consumeCallback(CALLBACK_TYPE_ERROR, map);
                                        }
                                    }
                                }).executeAsync();
                    }

                    @Override
                    public void onCancel() {
                        if (mTokenCallback != null) {
                            consumeCallback(CALLBACK_TYPE_CANCEL, Arguments.createMap());
                        }
                    }

                    @Override
                    public void onError(FacebookException exception) {
                        if (mTokenCallback != null) {

                            WritableMap map = Arguments.createMap();
                            map.putString("message", exception.getMessage());
                            consumeCallback(CALLBACK_TYPE_ERROR, map);
                        }
                        if (exception != null) {
                            if (AccessToken.getCurrentAccessToken() != null) {
                                LoginManager.getInstance().logOut();
                            }
                        }
                    }
                });
    }

    private void consumeCallback(String type, WritableMap map) {
        if (mTokenCallback != null) {
            map.putString("type", type);
            map.putString("provider", "facebook");

            mTokenCallback.invoke(map);
            mTokenCallback = null;
        }
    }

    @Override
    public String getName() {
        return "FacebookLoginModule";
    }

    @ReactMethod
    public void pickAccount(final Callback callback) {
        if (mTokenCallback != null) {
            AccessToken accessToken = AccessToken.getCurrentAccessToken();

            WritableMap map = Arguments.createMap();

            if (accessToken != null) {
                map.putString("token", AccessToken.getCurrentAccessToken().getToken());
                map.putString("expiration", String.valueOf(AccessToken.getCurrentAccessToken()));
                map.putBoolean("cache", true);
                consumeCallback(CALLBACK_TYPE_SUCCESS, map);
            } else {
                map.putString("message", "Cannot register multiple callbacks");
                consumeCallback(CALLBACK_TYPE_CANCEL, map);
            }
        }

        mTokenCallback = callback;

        //set read permissions https://developers.facebook.com/docs/facebook-login/permissions/v2.5
        LoginManager.getInstance().logInWithReadPermissions(
                (Activity) mActivityContext,
                Arrays.asList("public_profile", "email"));
    }

    @ReactMethod
    public void getCurrentToken(final Callback callback) {
        callback.invoke(AccessToken.getCurrentAccessToken().getToken());
    }

    public boolean handleActivityResult(final int requestCode, final int resultCode, final Intent data) {
        return mCallbackManager.onActivityResult(requestCode, resultCode, data);
    }
}

FacebookLoginPackage.java

//add to the same directory as MainActivity.java

package com.yourApp;

import android.content.Context;
import android.content.Intent;

import com.facebook.react.ReactPackage;
import com.facebook.react.bridge.JavaScriptModule;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.uimanager.ViewManager;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class FacebookLoginPackage implements ReactPackage {

    private Context mContext;
    private FacebookLoginModule mModuleInstance;

    FacebookLoginPackage(Context activityContext) {
        mContext = activityContext;
    }

    @Override
    public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
        mModuleInstance = new FacebookLoginModule(reactContext, mContext);

        return Arrays.<NativeModule>asList(mModuleInstance);
    }

    @Override
    public List<Class<? extends JavaScriptModule>> createJSModules() {
        return Collections.emptyList();
    }

    @Override
    public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
        return Arrays.asList();
    }

    public boolean handleActivityResult(final int requestCode, final int resultCode, final Intent data) {
        if (mModuleInstance == null) {
            return false;
        }

        return mModuleInstance.handleActivityResult(requestCode, resultCode, data);
    }
}

Login.js

var React = require('react-native');
var Dimensions = require('Dimensions');
var windowSize = Dimensions.get('window');
var FacebookLogin = require('./FacebookLoginModule.android');

var {
    StyleSheet,
    View,
    TouchableHighlight,
    Text
    } = React;

class Login extends React.Component {

    constructor(props) {
        super(props);
        this.redirectAfterSuccess = this.redirectAfterSuccess.bind(this);
        this._onFacebookPress = this._onFacebookPress.bind(this);
        this._onSignIn = this._onSignIn.bind(this);
    }

    redirectAfterSuccess(route) {
        this.props.navigator.push({
            component: route
        });
    }

    _onSignIn(info) {
        console.log('data from facebook login', info);
        this.redirectAfterSuccess('someRoute')
    }

    _onFacebookPress() {
        //call the magic and handle the response
        FacebookLogin.pickAccount(e => this._onSignIn(e))
    }

    render() {
        return (
            <View style={styles.container}>
                <Text>Your awesome app</Text>
                <TouchableHighlight onPress={this._onFacebookPress}>
                    <View style={styles.login}>
                        <Text style={styles.whiteFont}>Login with Facebook</Text>
                    </View>
                </TouchableHighlight>
            </View>
        )
    }
}

var styles = StyleSheet.create({
    container: {
        flexDirection: 'column',
        flex: 1,
        backgroundColor: 'white'
    },
    login: {
        flex: 1,
        backgroundColor: '#3B5998',
        padding: 20,
        alignItems: 'center'
    },
    whiteFont: {
        color: 'white'
    }
});

module.exports = Login;

MainActivity.java

//Add the package and call the method 

package com.yourApp;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;

import com.facebook.react.LifecycleState;
import com.facebook.react.ReactInstanceManager;
import com.facebook.react.ReactRootView;
import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;
import com.facebook.react.shell.MainReactPackage;
import com.facebook.soloader.SoLoader;

public class MainActivity extends Activity implements DefaultHardwareBackBtnHandler {

    private ReactInstanceManager mReactInstanceManager;
    private ReactRootView mReactRootView;

    private FacebookLoginPackage mFacebookLoginPackage;  // <--------Add the package


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mFacebookLoginPackage = new FacebookLoginPackage(this);   // <--------instantiate the package

        mReactRootView = new ReactRootView(this);

        mReactInstanceManager = ReactInstanceManager.builder()
                .setApplication(getApplication())
                .setBundleAssetName("index.android.bundle")
                .setJSMainModuleName("index.android")
                .addPackage(new MainReactPackage())
                .addPackage(mFacebookLoginPackage)           // <--------Add the package
                .setUseDeveloperSupport(BuildConfig.DEBUG)
                .setInitialLifecycleState(LifecycleState.RESUMED)
                .build();

        mReactRootView.startReactApplication(mReactInstanceManager, "yourApp", null);

        setContentView(mReactRootView);
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_MENU && mReactInstanceManager != null) {
            mReactInstanceManager.showDevOptionsDialog();
            return true;
        }
        return super.onKeyUp(keyCode, event);
    }

    @Override
    public void onBackPressed() {
      if (mReactInstanceManager != null) {
        mReactInstanceManager.onBackPressed();
      } else {
        super.onBackPressed();
      }
    }

    @Override
    public void invokeDefaultOnBackPressed() {
      super.onBackPressed();
    }

    @Override
    protected void onPause() {
        super.onPause();

        if (mReactInstanceManager != null) {
            mReactInstanceManager.onPause();
        }
    }

    @Override
    protected void onResume() {
        super.onResume();

        if (mReactInstanceManager != null) {
            mReactInstanceManager.onResume(this);
        }
    }
    
    //Call the method in MainActivity

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

        mFacebookLoginPackage.handleActivityResult(requestCode, resultCode, data);
    }
}

strings.xml

<resources>
    <string name="app_name">yourApp</string>
    <string name="fb_app_id">yourFacebookAppID</string>
</resources>

<!--add your Facebook App Id-->

UPDATE: This was written before any modules were available. Please see this repo https://github.com/magus/react-native-facebook-login for a fully installable version

I am facing issue with debug apk, it throw error that invalid key hash, The key hash asdgksagdjkgaskjdhkaj/asdas does not match any stored key value