friend 们，我需要帮助使用 Asynctask 或 Threads 将 android httppost 数据发送到服务器 当我点击发布按钮时，我需要将数据发送到我的服务器。但是当我点击它时，应用程序需要转到下一页并且数据需要作为后台进程发送。我是 Android 的新手。我不知道什么是正是用于这种任务(Threads 或 Asynctask)。 我试过这段代码，但它会给我异常错误

public void startProgress(final String name) {
        // Do something long
        Runnable runnable = new Runnable() {
            @Override
            public void run() {               
               try {
                   Thread.sleep(500);
                   send(name);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

             }
        };
        new Thread(runnable).start();
    }


    public void send(String name)
    {
        // get the message from the message text box
           HttpClient httpclient = new DefaultHttpClient();
           HttpPost httppost = new HttpPost("http://10.0.2.2:8080/Test");
           try {
                 List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
                 String co2 =input_field.getText().toString(); 
                 nameValuePairs.add(new BasicNameValuePair("Name", name));
                 httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                 Toast toast = Toast.makeText(getApplicationContext(), "Got it ", Toast.LENGTH_SHORT);
                 toast.show();
                 httpclient.execute(httppost);
                 input_field.setText("");
            } catch(Exception e){
                 Toast toast2 = Toast.makeText(getApplicationContext(),  "error", Toast.LENGTH_SHORT);
                 toast2.show();
            }
    }

但如果我以这种方式使用它，它就可以工作。(文本是该页面中的 TextView 项目)

public void startProgress(final String name) {
        // Do something long
        Runnable runnable = new Runnable() {
          @Override
          public void run() {



               try {
                Thread.sleep(500);

            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }


             text.post(new Runnable() {
                @Override
                public void run() {

                    send(name);
                }
              });
            }


        };
        new Thread(runnable).start();
      }

在下面这段代码中发生了什么，你能解释一下吗

text.post(new Runnable() {
                    @Override
                    public void run() {

                        send(name);
                    }
                  });

请帮我解决这个问题。如果有更好的方法来满足我的需要，请提出来。因为它对 Android 开发的经验非常少

最佳答案

您可以像这样使用 AsyncTask 来做到这一点:

public class HttpPostExanple extends AsyncTask<String, Void, String> 
{       

    @Override
    protected String doInBackground(String... params)   
    {           
        BufferedReader inBuffer = null;
        String url = "http://10.0.2.2:8080/Test";
        String result = "fail";
        try {
            HttpClient httpClient = new DefaultHttpClient();
            HttpPost request = new HttpPost(url);
            List<NameValuePair> postParameters = new ArrayList<NameValuePair>();
            postParameters.add(new BasicNameValuePair("name", params[0]));

            UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(
                    postParameters);

            request.setEntity(formEntity);
             httpClient.execute(request);
                    result="got it";

        } catch(Exception e) {
            // Do something about exceptions
            result = e.getMessage();
        } finally {
            if (inBuffer != null) {
                try {
                    inBuffer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return  result;
    }

    protected void onPostExecute(String page)
    {       
        //textView.setText(page); 
        Toast toast = Toast.makeText(getApplicationContext(), page, Toast.LENGTH_SHORT);
      toast.show();
    }   
}  

而且你需要在你的主要方法中有这个

new HttpPostExample().execute(new String[] {name}); 

检查一下。 希望这对您有所帮助。

关于android - 用于 httppost 的线程和异步任务任务，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19124150/