android.os.NetworkOnMainThreadException的替代解决方案

Question

现在我正在解决

  

android.os.NetworkOnMainThreadException

我将connect方法放入分离的线程中，但是当线程启动时，start()方法不会调用Run()， - 并且还使用AsyncTask，任务不会调用doInBackground()方法！

---

//对于AsyncTask，我的代码是

public class ConnectTask extends AsyncTask<URL, Integer, HttpEntity> {

    HttpEntity entity;
    String  statue;
    LogInJSONActivity mainActivity;
    @Override
    protected HttpEntity doInBackground(URL... arg0) {
        // TODO Auto-generated method stub
         mainActivity.setString("Inside Do in background");
         entity = connect(arg0[0]);
         mainActivity.setHttp(entity);
        return entity;
    }

    public  HttpEntity connect(String url) {

        statue= "Inside Connect";
        HttpClient httpclient = new DefaultHttpClient();
        // Prepare a request object
        HttpGet httpget = new HttpGet(url);
        // Execute the request
        HttpResponse response;
        HttpEntity entity = null;
        try {
            response = httpclient.execute(httpget);
            entity = response.getEntity();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return entity;
    }
    public void setActivity(LogInJSONActivity act){
        mainActivity = act;
    }
}

- ＆GT;在主要活动

URL url = null;
        try {
            url = new URL("http://www.flickr.com/photos/51469488@N03/");
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        ConnectTask backgroundTask = (ConnectTask) new ConnectTask();
        backgroundTask.setActivity(this);
        backgroundTask.execute(url);

---

//对于线程我的代码是： -

public class ConnectThread extends Thread {

    HttpEntity entity;
    String  statue;
    LogInJSONActivity mainActivity;
    @Override
    public void run() {
        // TODO Auto-generated method stub
         mainActivity.setString("Inside Run");
         entity = connect("http://www.flickr.com/photos/51469488@N03/");
         mainActivity.setHttp(entity);
         super.run();   
    }

    public  HttpEntity connect(String url) {

        statue= "Inside Connect";
        HttpClient httpclient = new DefaultHttpClient();
        // Prepare a request object
        HttpGet httpget = new HttpGet(url);
        // Execute the request
        HttpResponse response;
        HttpEntity entity = null;
        try {
            response = httpclient.execute(httpget);
            entity = response.getEntity();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        if(entity !=null)
            System.out.print("Valid Entity");
        else
            System.out.print("Null Entity");


        return entity;
    }
    public void setActivity(LogInJSONActivity act){
        mainActivity = act;
    }      
}

---

- ＆GT;在MainActivity中

ConnectThread t = new ConnectThread();
        t.setActivity(this);
        t.start();

Answer 1

您的error可能是因为您在Network UI上进行了thread次操作，API 11不允许这样做。我会说不是要创建单独的Thread，只需使用AsyncTask课程来执行Network operation。只需在doInBackground()中进行网络操作，然后从UI线程调用AsyncTask类，

new YourAsyncTask().execute(url);

通过创建一个单独的Thread类并使其更复杂，所有这些都不需要付出太多努力。