Android Notes 34: Facebook Login Integration & Fetch User Information[Updated]
Updated: March 26, 2020
This is gonna be a kind of tutorial which I will show you how to implement Facebook Login Button and how to get user information from Facebook login authentication.
1. Register App
First, we need to register our application on Facebook. Login your FB account on https://developers.facebook.com/apps/
Click “Add a New App” button and a box will have appeared.
Select Android and you will see that screen. In this screen, write your application name and click Create New Facebook App ID button.
Next, we will fill Display Name, Contact Email and select our application category.
After you fill them, click Create App ID.
Finally, we can start Quick Start for Android Tour. I suggest you follow every step. Once you have done, you never need to check your back later.
2. Add Facebook SDK to Project
We need to add FB SDK to our project, at Android Studio app -> build.gradle let’s add our gradle segment.
repositories {
mavenCentral()
}In dependencies, we need to add :
implementation ‘com.facebook.android:facebook-android-sdk:[4,5)’3. Add Facebook App ID
1. Open our strings.xml file, at Android Studio: /app/src/main/res/values/strings.xml.
2. Add a new string with the name facebook_app_id containing the value of your Facebook App ID:
<string name="facebook_app_id">your_facebook_app_id</string>3. Add fb login protocol scheme, you just need to add this as a new string :
// if your App ID is 1234567, you should use fb1234567
<string name="fb_login_protocol_scheme">fbAPP_ID</string>4. Open AndroidManifest.xml.
5. Add a uses-permission element to the manifest:
<uses-permission android:name="android.permission.INTERNET"/>6. Add a meta-data element to the application element:
<application android:label="@string/app_name" ...>
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/>
</application>7. Add fb protocol scheme to the Facebook Login Activity :
<activity
android:name=".LoginActivity"
android:exported="true"
android:screenOrientation="portrait">
<intent-filter>
<data android:scheme="@string/fb_login_protocol_scheme" />
</intent-filter>
</activity>Now, we need to fill this part on FB Quick Start Tour. We need to write our app’s package and MainClass’ package name.
After we finish these, let’s click the Next button.
4. How to get Key Hashes
After we click Next, we have one more step to go. We need a hash key.
On Mac, open Terminal and copy this code segment :
keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | openssl sha1 -binary | openssl base64On Windows, open CMD and copy this code segment :
keytool -exportcert -alias androiddebugkey -keystore %HOMEPATH%\.android\debug.keystore | openssl sha1 -binary | openssl base64After you enter this code, it might ask your password, enter and you will get your hash key. Copy it and enter the Key Hashes and click Next.
5. Enable Single Sign-On for App
Now, enter: developers.facebook.com/ and select our new app. It will open its Dashboard. On the left menu, you can see Settings.
As you can see in the below image, you need to open “Single Sign On” button.
6. Initialise Facebook SDK
Now, we need to go our Android Studio and initialise FB SDK. OnCreate part we need to call sdkInitialize BEFORE setContentView;
UPDATE: We do not need to use .sdkInitialize.
From Facebook :
The Facebook SDK is now auto initialized on Application start. If you are using the Facebook SDK in the main process and don’t need a callback on SDK initialization completion you can now remove calls to FacebookSDK.sdkInitialize. If you do need a callback, you should manually invoke the callback in your code.
https://developers.facebook.com/docs/android/upgrading-4x
@Override
public void onCreate() {
super.onCreate();// DO NOT need .sdkInitialize anymore, it is auto initialized.
// Facebook SDK init
// FacebookSdk.sdkInitialize(getApplicationContext());
setContentView(R.layout.activity_main);}
7. Add the Facebook Login Button on XML
Simply copy it :
<com.facebook.login.widget.LoginButton
android:id="@+id/facebook_login"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:layout_gravity="center_horizontal"
android:layout_below="@+id/logo"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
/>Do not forget: You can customise FB Login button !
8. PrefUtil Class
I just created this class for saving FB login Access Token and user information, of course, you can use another method.
You can change names or do not use Logd parts.
9. Register Callback Creation and Read Permissions
We need a registerCallback object to get FB Login is a success, failed or even cancelled.
- We have to create it : ( Do not forget, you need to create it before setContentView ), also do not forget to init your Facebook login button!
// Facebook SDK init
FacebookSdk.sdkInitialize(getApplicationContext());
callbackManager = CallbackManager.Factory.create();
setContentView(R.layout.activity_login);loginButton = (LoginButton) findViewById(R.id.facebook_login);
2. We need to get read permissions from user.
loginButton.setReadPermissions(Arrays.asList(
"public_profile", "email"));You need to use this little code segment BEFORE loginButton.registerCallBack() method!
10. How to Get Facebook User Data
I just wrote a method which gets User’s FB data, if you need any question there, please feel free to write a comment :)
11. How to set registerCallback Method
AFTER setReadPermissions, we can finally set our registerCallback method to understand what is going on when the user tries to login with FB account.
12. NEVER FORGET: onActivityResult Part
We just need to use onActivityResult to use callbackManager. Just simply copy this code segment :
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
callbackManager.onActivityResult(requestCode, resultCode, data);
}13. Delete Access Token
If you wonder my deleteAccessToken method, that’s the bonus one :P
private void deleteAccessToken() {
AccessTokenTracker accessTokenTracker = new AccessTokenTracker() {
@Override
protected void onCurrentAccessTokenChanged(
AccessToken oldAccessToken,
AccessToken currentAccessToken) {
if (currentAccessToken == null){
//User logged out
prefUtil.clearToken();
LoginManager.getInstance().logOut();
}
}
};
}14. Ta-daaa :)
Finally, it’s over. We got it :) Now, your users can log in with their FB accounts. If you have any question and problem, feel free to ask :)
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