Essential Books

Basic Account Authenticator Service

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The Android Account Authenticator system can be used to make the client authenticate with a remote server. Three pieces of information are required:

1. The service:

Place the following permissions in your AndroidManifest.xml: 

<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.MANAGE_ACCOUNTS" />
<uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" />
<uses-permission android:name="android.permission.USE_CREDENTIALS" />

Declare the service in the manifest file: 

<service android:name="com.example.MyAuthenticationService">
    <intent-filter>
        <action android:name="android.accounts.AccountAuthenticator" />
    </intent-filter>
    <meta-data
        android:name="android.accounts.AccountAuthenticator"
        android:resource="@xml/authenticator" />
</service>

Note that the android.accounts.AccountAuthenticator is included within the intent-filter tag. The xml resource (named authenticator here) is specified in the meta-data tag.

The service class: 

public class MyAuthenticationService extends Service {

    private static final Object lock = new Object();
    private MyAuthenticator mAuthenticator;

    public MyAuthenticationService() {
        super();
    }

    @Override
    public void onCreate() {
        super.onCreate();

        synchronized (lock) {
            if (mAuthenticator == null) {
                mAuthenticator = new MyAuthenticator(this);
            }
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mAuthenticator.getIBinder();
    }

}

2. The xml resource: 

<account-authenticator xmlns:android="http://schemas.android.com/apk/res/android"
    android:accountType="com.example.account"
    android:icon="@drawable/appicon"
    android:smallIcon="@drawable/appicon"
    android:label="@string/app_name" />

Do not directly assign a string to android:label or assign missing drawables. It will crash without warning.

3. Extend the AbstractAccountAuthenticator class: 

public class MyAuthenticator extends AbstractAccountAuthenticator {

    private Context mContext;

    public MyAuthenticator(Context context) {
        super(context);
        mContext = context;
    }

    @Override
    public Bundle addAccount(AccountAuthenticatorResponse response,
                             String accountType,
                             String authTokenType,
                             String[] requiredFeatures,
                             Bundle options) throws NetworkErrorException {

        Intent intent = new Intent(mContext, LoginActivity.class);
        intent.putExtra(AccountManager.KEY_ACCOUNT_AUTHENTICATOR_RESPONSE, response);

        Bundle bundle = new Bundle();
        bundle.putParcelable(AccountManager.KEY_INTENT, intent);

        return bundle;
    }

    @Override
    public Bundle confirmCredentials(AccountAuthenticatorResponse response, Account account, Bundle options) throws NetworkErrorException {
        return null;
    }

    @Override
    public Bundle editProperties(AccountAuthenticatorResponse response, String accountType) {
        return null;
    }

    @Override
    public Bundle getAuthToken(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options) throws NetworkErrorException {
        return null;
    }

    @Override
    public String getAuthTokenLabel(String authTokenType) {
        return null;
    }

    @Override
    public Bundle hasFeatures(AccountAuthenticatorResponse response, Account account, String[] features) throws NetworkErrorException {
        return null;
    }

    @Override
    public Bundle updateCredentials(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options) throws NetworkErrorException {
        return null;
    }
}

The addAccount() method in AbstractAccountAuthenticator class is important as this method is called when adding an account from the “Add Account” screen in under settings. AccountManager.KEY_ACCOUNT_AUTHENTICATOR_RESPONSE is important, as it will include the AccountAuthenticatorResponse object that is needed to return the account keys upon successful user verification.

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Authenticator:
* Android Authenticator
* Basic Account Authenticator Service
Table Of Contents
0 Getting Started
1 Layouts
2 Gradle
3 RecyclerView onClickListeners
4 NavigationView
5 Intent
6 JSON handling with org.json
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10 Exceptions
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52 Tools Attributes
53 Toast
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58 The Manifest File
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62 Data Synchronization with Sync Adapter
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159 Otto Event Bus
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162 Creating Overlay always-on-top Windows
163 ExoPlayer
164 Inter-app UI testing with UIAutomator
165 MediaSession
166 Speech to Text Conversion
167 FileProvider
168 Publish .aar file to Apache Archive with Gradle
169 XMPP
170 Authenticator
171 RecyclerView and LayoutManagers
172 AudioManager
173 Job Scheduling
174 Accounts and AccountManager
175 OpenCV
176 Split Screen Multi-Screen Activities
177 Threads
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180 Touch Events
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184 ORMLite
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197 Check Data Connection
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199 FileIO
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203 Strick Mode Policy
204 Internalization and localization
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224 Creating Splash screen
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234 Context
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236 Secure SharedPreferences
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256 Google Drive API
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258 Annotation Processor
259 SyncAdapter with periodically do sync of data
260 Singleton Class for Toast Message
261 Fastjson
262 Android Architecture Components
263 Jackson
264 Play Store
265 Loading Bitmaps Effectively
266 Getting system font names
267 Smartcard
268 Convert vietnamese string to english
269 Contributors