PHP不会从Android Post值返回任何内容

Question

i am using web service to send user information to MySQL but PHP doesn't return posted values when i am trying to echo the values, and gives me:

Notice: Undefined index: user_name in C:\xampp\htdocs\webservice\sign_up.php on line 5

my code :

    protected Void doInBackground(Void... params) {
        // TODO Auto-generated method stub

        try {

            HttpClient client = new DefaultHttpClient();
            HttpPost request = new HttpPost("http://10.0.2.2/webservice/sign_up.php");
            ArrayList<NameValuePair> post = new ArrayList<NameValuePair>(3);
            post.add(new BasicNameValuePair("user_name", name));
            post.add(new BasicNameValuePair("user_email", email));
            post.add(new BasicNameValuePair("user_password", password));
            request.setEntity(new UrlEncodedFormEntity(post));
            HttpResponse response = client.execute(request);

            int status = response.getStatusLine().getStatusCode();  
            Log.i("data posted, status = " , Integer.toString(status)); 

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

        return null;


    }
}

and PHP :

<?php
$user = $_POST["user_name"];
echo $user;
?>

Answer 1

Sample code to pass string from android client to PHP

Android Client part

The code below will enable your android app to talk to a webpage.

Note : You also need to enable uses permission for internet in the android.manifest file.

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

Code for android app

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

//This is the data to send
String MyName = 'adil'; //any data to send

try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("action", MyName));

httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

// Execute HTTP Post Request

ResponseHandler<String> responseHandler = new BasicResponseHandler();
String response = httpclient.execute(httppost, responseHandler);

//This is the response from a php application
String reverseString = response;
Toast.makeText(this, "response" + reverseString, Toast.LENGTH_LONG).show();

} catch (ClientProtocolException e) {
Toast.makeText(this, "CPE response " + e.toString(), Toast.LENGTH_LONG).show();
// TODO Auto-generated catch block
} catch (IOException e) {
Toast.makeText(this, "IOE response " + e.toString(), Toast.LENGTH_LONG).show();
// TODO Auto-generated catch block
}

}//end postData()

PHP code

<?php

echo $_POST["action"];

?>