从android应用程序向服务器发送数据时发现异常[重复]

Question

我正在尝试将数据从 Android 应用程序发送到服务器....但是单击保存按钮会导致 android.os.NetworkOnMainThreadException 并且应用程序停止。 请问有人可以帮忙吗？

HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://farahkhan.byethost15.com/try.php");
try {

    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
       nameValuePairs.add(new BasicNameValuePair("username", "01"));
       nameValuePairs.add(new BasicNameValuePair("email", signupemailString));

       httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

       httpclient.execute(httppost);

       signupemail.setText(""); //reset the message text field
        Toast.makeText(getBaseContext(),"Sent",Toast.LENGTH_SHORT).show();
} catch (ClientProtocolException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}

Answer 1

用这个替换你的代码：

new Thread(new Runnable() {

                @Override
                public void run() {
                     HttpClient httpclient = new DefaultHttpClient();
                HttpPost httppost = new HttpPost("http://farahkhan.byethost15.com/try.php");
                try {

                    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
                       nameValuePairs.add(new BasicNameValuePair("username", "01"));
                       nameValuePairs.add(new BasicNameValuePair("email", signupemailString));

                       httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                       httpclient.execute(httppost);
                       runOnUiThread(new Runnable() {

                        @Override
                        public void run() {
                             signupemail.setText(""); //reset the message text field
                        Toast.makeText(getBaseContext(),"Sent",Toast.LENGTH_SHORT).show();

                        }
                    });

                } catch (ClientProtocolException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

                }
            }).start();

并在清单文件中添加权限：

<uses-permission android:name="android.permission.INTERNET" /> 

Answer 2

向您的清单文件添加互联网权限

<uses-permission android:name="android.permission.INTERNET" /> 

之后检查this answer