当应用程序是onPause()时，我一直在接收LogCat上的错误信息

Question

现在我有了下面的类，我在主活动中实例化了它，以便从Internet检索一些数据。

正如你所看到的，这个类包含一个AsyncTask，它从Internet执行数据收集。

当我的活动暂停时(通过模拟器上的BACK按钮)，我停止AsyncTask。

然而，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，它从不停止…

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.

这是我的类

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;      
        }
    }
}

Answer 1

找到了谜语的解决方案:见活动被破坏后我继续接收消息

服务正在被正确终止。

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。

Answer 2

我认为问题在下面行

       client.getConnectionManager().shutdown();

您将找到更多解决方案的描述

这是原始的Apache文档，也可以帮助更好地理解。