MyApp.java

public class MyApp extends Application {    
    @Override
    public void onCreate() {
        super.onCreate();

        // set up a dummy account for syncing
        AccountManager manager = AccountManager.get(this);
        final Account account = new Account(MyAccountAuthenticator.ACCOUNT_NAME, getPackageName());
        if (manager.addAccountExplicitly(account, null, null)) {
            // Only change sync settings if it did not exist, yet
            ContentResolver.setIsSyncable(account, MyAccountAuthenticator.CONTENT_AUTHORITY, 1);
            ContentResolver.setSyncAutomatically(account, MyAccountAuthenticator.CONTENT_AUTHORITY, true);
            // Sync daily by default
            ContentResolver.addPeriodicSync(account, MyAccountAuthenticator.CONTENT_AUTHORITY, new Bundle(), 24 * 60 * 60);
        }
    }

}