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谢谢你的帮助和圣诞快乐。

好的。

现在我有以下类,我在我的主要活动中对其进行实例化,以便从互联网上检索一些数据。

如您所见,该类包含一个 AsyncTask,它执行来自 Internet 的数据收集。

当我的活动暂停时(通过模拟器上的 BACK 按钮),我停止 AsyncTask。

尽管如此,LogCat 继续显示消息,因为 AsyncTask 仍在继续尝试从 Internet 获取数据。

这是 LogCat,它永远不会停止......

12-24 09:36:48.806: E/grabXML(698): java.lang.IllegalStateException: Manager is shut down.
12-24 09:36:48.816: E/grabXML(698): Exception fetching data
12-24 09:36:48.816: E/grabXML(698): java.lang.IllegalStateException: Manager is shut down.
12-24 09:36:48.836: E/grabXML(698): Exception fetching data
12-24 09:36:48.836: E/grabXML(698): java.lang.IllegalStateException: Manager is shut down.
12-24 09:36:48.846: E/grabXML(698): Exception fetching data
12-24 09:36:48.846: E/grabXML(698): java.lang.IllegalStateException: Manager is shut down.
12-24 09:36:48.856: E/grabXML(698): Exception fetching data
12-24 09:36:48.856: E/grabXML(698): java.lang.IllegalStateException: Manager is shut down.
12-24 09:36:48.966: E/grabXML(698): Exception fetching data
12-24 09:36:48.966: E/grabXML(698): java.lang.IllegalStateException: Manager is shut down.
12-24 09:36:48.996: E/grabXML(698): Exception fetching data
12-24 09:36:48.996: E/grabXML(698): java.lang.IllegalStateException: Manager is shut   down.
12-24 09:36:49.037: E/grabXML(698): Exception fetching data
12-24 09:36:49.037: E/grabXML(698): java.lang.IllegalStateException: Manager is shut down.

这是我的课

public class Grab{
    public String url;
    public String srt = "cav";
    public boolean flag = false;
    public GrabXml g;
    public Grab (String u){
        url = u;
    } 

    public String vai(){
        g = new GrabXml();
        g.execute();
        Log.e("", srt);
        while(!flag){
            // nothing
        };
        g.cancel(true);
        return srt;
    }

    public void fermaGrab() {
        g.cancel(true); 
    }

    public class GrabXml extends AsyncTask<Void, String, Void>{
        @Override
        protected Void doInBackground(Void... arg0) {
            Log.e("", "arrivo al do in background");
            Log.e("", url);
            DefaultHttpClient client = new DefaultHttpClient();
            HttpGet getMethod = new HttpGet(url);
            try {
                ResponseHandler<String> responseHandler = new BasicResponseHandler();
                srt = client.execute(getMethod, responseHandler);
                Log.e("", "passo per GrabXML");
            }
            catch (Throwable t) {
                android.util.Log.e("grabXML", "Exception fetching data", t);
            }
            flag = true;
            client.getConnectionManager().shutdown();
            return null;
        }

        @Override
        protected void onProgressUpdate(String... item) {
            // nothing
        }

        @Override
        protected void onPostExecute(Void unused) {
            flag = true;      
        }
    }
}
4

2 回答 2

1

我认为下面行内的问题

       client.getConnectionManager().shutdown();

你会发现更多关于你的解决方案的描述

这是原始的 Apache 文档,也有助于更好地理解。

希望它会有所帮助:)

于 2012-12-24T10:24:36.257 回答
1

找到谜语解法:见Activity被销毁后我继续收到消息

该服务实际上被正确地杀死了。

关键是服务包含一个无限循环,即使服务被取消/销毁,循环也会继续。

祝大家圣诞快乐!!

于 2012-12-24T13:17:00.310 回答