如何从同步适配器访问应用程序对象

Question

我正在使用开源服务器开发一个IM应用程序。我正在实现用于管理联系人的同步适配器。

如果访问应用程序类中保留的连接对象，则从同步适配器的onPerformSync()中返回null。

我做错了什么？我该怎么做？

我的申请课

public class MyApp extends Application {
    private Connection connection;
    private static MyApp instance;
    public static MyApp getInstance() {
    return instance;
}

public static void setInstance(MyApp instance) {
    MyApp.instance = instance;
}
@Override
public void onCreate() {
    super.onCreate();
    instance = new MyApp();
}
public Connection getAuthenticatedConnection() throws NullPointerException {

    if (instance.connection != null
            && instance.connection.isAuthenticated()) {
        return instance.connection;
    } else {

//  Calling service which will create connection and update the object

        Intent intent = new Intent(IM_Service_IntentMessaging.ACTION);
        intent = new Intent(getContext(), IM_Service_IntentMessaging.class);
        Bundle b = new Bundle();
        b.putInt("key", IM_Service_IntentMessaging.KEY_CONNECTION);
        intent.putExtras(b);
        this.context.startService(intent);

        throw new NullPointerException();
    }
//service calls this method to update the object
public void setConnection(Connection connection) {
    instance.connection = connection;
}
}

我的onPerformSync方法如下..。

@Override
public void onPerformSync(Account account, Bundle bundle, String authority,
        ContentProviderClient provider, SyncResult syncResult) {

    try {

        this.connection = MyApp.getInstance()
                .getAuthenticatedConnection();

        this.roster = this.connection.getRoster();

    } catch (NullPointerException e) {
                    //this line executes always
        Log.e(TAG, "connection null...ending....");

        return;
    }

    this.mAccount = account;

    Log.d(TAG, "...onPerformSync...");

    getAllContacts();
}

当我尝试在Application的getAuthenticatedConnection()方法中创建断点时，它没有被触发，但是我从那里调用来创建连接的服务IM_Service_IntentMessaging正在工作。

Answer 1

我找到了解决问题的方法，我应该从同步适配器的清单文件声明中删除android:process=":sync"。正因为如此，它就像对待不同的过程一样。