java - android.os.NetworkOnMainThreadException 的替代解决方案

Question

现在我正在解决

android.os.NetworkOnMainThreadException

我将connect方法放入单独的线程中，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!

<小时/>

//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;
    }
}

-> 在主要 Activity 中

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);

<小时/>

//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;
    }      
}

<小时/>

-> 在 MainActivity 中

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

Answer 1

您的错误可能是因为您正在UI线程上执行一些网络操作，这不是从API 11允许。我想说不要创建单独的Thread，只需使用AsyncTask类来执行您的Network > 操作。只需在 doInBackground() 中执行网络操作，然后从 UI 线程调用 AsyncTask 类，

new YourAsyncTask().execute(url);

这一切都不需要通过创建单独的 Thread 类并使其变得更加复杂来付出太多努力。