Question

我有一个共享对象，它在Application对象中实例化，我希望从调用服务器设置其值。但是当在异步任务onPostExecute中引用该对象时，我认为我引用的对象不会在asyncTask之外更改。

这是我的简化代码：

public class AwesomApplication extends Application implements OnTaskComplete {
public Player currentPlayer;
public Player examplePlayer;

public void onCreate() {
    super.onCreate();
    new getPlayerInfoAsync(this).execute(new Player("User", "Password"));
    examplePlayer = new Player(Some values);
}

@Override
public void onTaskComplete(Player player){
this.currentPlayer = player; 
}

private class getPlayerInfoAsync extends AsyncTask <Player, Integer, Player>
{

    private OnTaskCompleted listener;
    public getPlayerInfoAsync(OnTaskCompleted listener){
        this.listener=listener;
    }

    @Override
    protected Player doInBackground(Player... players) {
        Player tmpPlayer = gameServer.getPlayerInfo(new Player(players[0].getUserName(), players[0].getPassword()));
        Log.d(TAG, "Temp userID" + tmpPlayer.getUserID());
        return tmpPlayer;
    }

    @Override
    protected void onPostExecute(Player player) {
        super.onPostExecute(player);
        currentPlayer = player;
        listener.onTaskComplete();
        Log.d(TAG, "Current userID" + currentPlayer.getUserID());
        }
    }
}

我为Asynctask创建了一个接口，用作回调。

public interface OnTaskCompleted{
    void onTaskCompleted(Player player);
}

“Temp userID”和“当前用户ID”的日志输出是我从AsyncTask内部调用时所期望的。但是从另一个Activity调用它们是null。另一方面，像examplePlayer一样实例化的对象会在所有其他活动中保留其值。这是为什么？如何在AsyncTask内部进行更改以便在外部进行更改？

即使我让调用类实现了一个回调接口，问题仍然存在。

在asyncTask内部更改的对象不会在外部更改

0 个答案: