从没有 get() 方法的 AsyncTask 返回值 [英] Return value from AsyncTask without get() method

问题描述

我正在尝试从 DoInBackground 中的异步任务返回值，但调用 get() 方法会冻结我的 UI.如何将我的代码重写为回调方法?:

I'm trying to return value from my asynctask in DoInBackground, but calling get() method freezes my UI. How can I re-write my code to a callback method? :

public class GetUrlDataTask extends AsyncTask<String, Integer, String> {
String response;
HttpUtils util;
@Override
protected String doInBackground(String... params) {
    try {
        util = new HttpUtils(params[0]);
        response = util.getContent();
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return response;
}

@Override
protected void onPostExecute(String result) {
    super.onPostExecute(result);
}

在我的活动中，我得到的结果为 response = new GetUrlDataTask().execute("site").get;

In my activity I get result as response = new GetUrlDataTask().execute("site").get;

推荐答案

[UPDATE] 现在我建议使用注解.使用注释，您可以注入视图，只需几个字母就可以在编译步骤中将函数作为异步过程.在 github 上查看黄油刀库.

[UPDATE] Now i suggest to use annotations. With annotations you can inject views, make function as asyncronous process on the compilation step with just a few letters. Check out butterknife library on github.

黄油刀

您可以创建接口，将其传递给 AsyncTask(在构造函数中)，然后在 onPostExecute 中调用方法

You can create interface, pass it to AsyncTask (in constructor), and then call method in onPostExecute

例如:

您的界面:

public interface OnTaskCompleted{
    void onTaskCompleted();
}

您的活动:

public YourActivity implements OnTaskCompleted{
    //your Activity
}

还有你的 AsyncTask:

And your AsyncTask:

public YourTask extends AsyncTask<Object,Object,Object>{ //change Object to required type
    private OnTaskCompleted listener;

    public YourTask(OnTaskCompleted listener){
        this.listener=listener;
    }

    //required methods

    protected void onPostExecute(Object o){
        //your stuff
        listener.onTaskCompleted();
    }
}

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