SyncAdapterExample

Synchronizing data between an Android device and web servers can make your application significantly more useful and compelling for your users. For example, transferring data to a web server makes a useful backup, and transferring data from a server makes it available to the user even when the device is offline. In some cases, users may find it easier to enter and edit their data in a web interface and then have that data available on their device, or they may want to collect data over time and then upload it to a central storage area.

Create a stub authenticator

public class StubAuthenticator extends AbstractAccountAuthenticator {

public StubAuthenticator(Context context) {
    super(context);
}

@Override
public Bundle editProperties(AccountAuthenticatorResponse accountAuthenticatorResponse,
                             String s) {

    throw new UnsupportedOperationException();
}

@Override
public Bundle addAccount(AccountAuthenticatorResponse accountAuthenticatorResponse, String s,
                         String s2, String[] strings, Bundle bundle) throws NetworkErrorException {

    return null;
}

@Override
public Bundle confirmCredentials(AccountAuthenticatorResponse accountAuthenticatorResponse,
                                 Account account, Bundle bundle) throws NetworkErrorException {

    return null;
}

@Override
public Bundle getAuthToken(AccountAuthenticatorResponse accountAuthenticatorResponse,
                           Account account, String s, Bundle bundle) throws NetworkErrorException {

    throw new UnsupportedOperationException();
}

@Override
public String getAuthTokenLabel(String s) {
    throw new UnsupportedOperationException();
}

@Override
public Bundle updateCredentials(AccountAuthenticatorResponse accountAuthenticatorResponse,
                                Account account, String s, Bundle bundle) throws NetworkErrorException {

    throw new UnsupportedOperationException();
}

@Override
public Bundle hasFeatures(AccountAuthenticatorResponse accountAuthenticatorResponse,
                          Account account, String[] strings) throws NetworkErrorException {

    throw new UnsupportedOperationException();
}

}

• Bind the authenticator to the framework (By creating a bound Service for it)

public class StubAuthenticatorService extends Service { private StubAuthenticator authenticator;

@Override
public void onCreate() {
    authenticator = new StubAuthenticator(this);
}

/*
* When the system binds to this Service to make the RPC call
* return the authenticator’s IBinder.
*/
@Override
public IBinder onBind(Intent intent) {
    return authenticator.getIBinder();
}

}

Create a stub content provider

public class StubContentProvider extends ContentProvider { @Override public boolean onCreate() { return true; }

@Override
public Cursor query(Uri uri, String[] columns, String selection, String[] selectionArgs, String sortOrder) {
    return null;
}

@Override
public String getType(Uri uri) {
    return null;
}

@Nullable
@Override
public Uri insert(Uri uri, ContentValues contentValues) {
    return null;
}

@Override
public int delete(Uri uri, String s, String[] strings) {
    return 0;
}

@Override
public int update(Uri uri, ContentValues contentValues, String s, String[] strings) {
    return 0;
}

}

Create a sync adapter

public class SyncAdapter extends AbstractThreadedSyncAdapter {

SyncAdapter(Context context, boolean autoInitialize) {
    super(context, autoInitialize);
}

@Override
public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient contentProviderClient, SyncResult syncResult) {
    Log.e("SyncAdapter", " In onPerformSync demo example");
}

}