Question

的副本

我使用此代码使用android

将发布数据发送到服务器

public void postData() {
        // Create a new HttpClient and Post Header
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://www.mysite.com/android.php");

        try {
            // Add your data
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            nameValuePairs.add(new BasicNameValuePair("id", "12345"));
            nameValuePairs.add(new BasicNameValuePair("stringdata", "Hi"));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            // Execute HTTP Post Request
            HttpResponse response = httpclient.execute(httppost);

        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
        } catch (IOException e) {
            // TODO Auto-generated catch block
        }
    }

但是当我运行此应用程序时，它会显示此错误

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.senddata/com.example.senddata.MainActivity}: android.os.NetworkOnMainThreadException

什么问题？有人可以帮忙吗？

Answer 1

尝试在setContentView（）下面的mainactivityactivity中使用以下代码，以避免networkOnmainThread异常..

if (android.os.Build.VERSION.SDK_INT > 9) {
                StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
                StrictMode.setThreadPolicy(policy);
            }

但是，使用AsyncTask在后台线程中进行大量操作而不阻塞主线程会很棒！

并参考此链接......

AsyncTask Android example

Answer 2

使用asInctask在doInBackground off asynctask中调用postData。不要从mainThread

中调用它

Answer 3

您无法在主线程上使用AsyncTask类来执行与网络相关的任务

Android将发布数据发送到服务器

3 个答案: