Official documents

Facebook logs in to Android official documents

Create application

First go Facebook Developer Platform Register for a developer account where you need to go over the wall and add your own application in the background

SDK integration

There are two ways to integrate SDK

• Maven mode
• In your project, open your_app > Gradle Scripts > build. gradle (Project) to ensure that the following repositories are added to buildscript {repositories {}}

jcenter() 

• In your project, open your_app > Gradle Scripts > build. gradle (Module: app) and add the following execution statements to the dependencies {} section to rely on the latest version of Facebook to log in to SDK:

 implementation 'com.facebook.android:facebook-login:[4,5)'

• Jar import mode
  Download Facebook's latest SDK jar package and place it in the libs folder of the project.
  The SDK download address is: Facebook SDK Download Address

Editing resources and lists

• Open the / app/res/values/strings.xml file

<string name="facebook_app_id">15477621189....</string>
<string name="fb_login_protocol_scheme">fb15477621189....</string>

• Open the / APP / manifest / Android Manifest. XML file
  
  • add permission

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

• Add the following meta-data elements and the corresponding Activity to the application element

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

    <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>

Fill in the package name of APP

Fill in the background of Facebook control

Developing and publishing key hashes for applications

First, three tools are needed:

• Keytool: The default in JDK already exists
• windows openssl Library
• Keystore: debug.keystore and keystore for officially launched applications

Secondly, using the command line cmd to generate debugging and formal keystore key hash, cmd channel JDK directory, enter a command, pay attention to adjusting their own paths, debug.keystore password default is not available, just return directly.

• Debugging version secret key hash

keytool -exportcert -alias androiddebugkey -keystore "C:\Users\USERNAME\.android\debug.keystore" | "PATH_TO_OPENSSL_LIBRARY\bin\openssl" sha1 -binary | "PATH_TO_OPENSSL_LIBRARY\bin\openssl" base64

• Formal version secret key hash

keytool -exportcert -alias YOUR_RELEASE_KEY_ALIAS -keystore YOUR_RELEASE_KEY_PATH | openssl sha1 -binary | openssl base64

The generated secret key hash is a string of 28 characters, similar to the following

QvoiWD1LQEfDIrvczaq31WCJZjX=

API usage of SDK

• Initialized login callback for SDK, called in onCreate()

callbackManager = CallbackManager.Factory.create();
        LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                Log.e(TAG, "Login successfully: " + loginResult.getAccessToken().getToken());
                loginResult.getAccessToken().getApplicationId();
                loginResult.getAccessToken().getUserId();
            }

            @Override
            public void onCancel() {
                Log.e(TAG, "Login cancelled");
            }

            @Override
            public void onError(FacebookException error) {
                Log.e(TAG, "Login error");
            }
        });

• Call the login interface where you need to call the login

LoginManager.getInstance().logInWithReadPermissions(MainActivity.this, Arrays.asList("public_profile"));

• Call callbackManager.onActivityResult in the onActivityResult method and pass the login result to LoginManager through the callbackManager

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

Such a simple Facebook login client API has been completed, if you need server-side validation, the way of validation is different, you can refer to it. Access password

Application testing

• Testing Cell Phone: Need to Turn over Wall
  
  • You need a google play service that can be downloaded from major app stores: Google Installer
  • Download Facebook app from google play Store
• Install debug on behalf of buyer into mobile phone running test

Matters needing attention

• Configure your debug.keystore hash key to the Facebook control background, otherwise the debug app will be unavailable to the mobile phone.
• Note that your application parameters are properly configured to: / app/res/values/strings.xml
• If you configure the package name in the Facebook control background, make sure that your application's package name is the same as the Facebook configuration.