所有首先，你如果条件的 JSONParser 从不执行，因为

您若条件应该是，

 如果（method.equals（POST））
 

不是

 如果（方法==POST）
 

第二个，

此外，而不是使用 runOnUiThread 在doInBackground（）把你的UI选择更新code中的AsyncTask的 onPostExecute（）方法。

I have a List that includes Values for my MySQL Databse. The values are transfered with the list, but when i have a look in my variables (in Debug Mode). I see that just the old values are sended to the PHP Files and not the "updated" Values.

Here i get the old value of "likes":

  protected String doInBackground(String... params) {

        // updating UI from Background Thread
        runOnUiThread(new Runnable() {
            public void run() {
                // Check for success tag
                int success;
                try {
                    // Building Parameters
                    List<NameValuePair> params = new ArrayList<NameValuePair>();
                    params.add(new BasicNameValuePair("id", cid));

                    // getting product details by making HTTP request
                    // Note that product details url will use GET request
                    JSONObject json = jParser.makeHttpRequest(url_details, "GET", params);

                    // check your log for json response
                    Log.d("Details Song", json.toString());

                    // json success tag
                    success = json.getInt(TAG_SUCCESS);
                    if (success == 1) {
                        // successfully received product details
                        JSONArray chartsObj = json.getJSONArray(TAG_CHARTS); // JSON Array

                        // get first product object from JSON Array
                        JSONObject charts = chartsObj.getJSONObject(0);

                        // product with this id found
                        // Edit Text
                        txtInterpret = (TextView)findViewById(R.id.tblInterpret);
                        txtTitel = (TextView)findViewById(R.id.tblTitel);
                        txtAlbum = (TextView)findViewById(R.id.tblAlbum);
                        txtLikes = (TextView)findViewById(R.id.like);
                        thumb_image = (ImageView)findViewById(R.id.albumcover); 

                        imageLoader = new ImageLoader(getApplicationContext());
                        imageLoader.DisplayImage(charts.getString(TAG_ALBUMCOVER), thumb_image);
                        txtInterpret.setText(charts.getString(TAG_INTERPRET));
                        txtTitel.setText(charts.getString(TAG_TITEL));
                        txtAlbum.setText(charts.getString(TAG_ALBUM));
                        txtLikes.setText(Integer.toString(charts.getInt(TAG_LIKES)));
                        likes = charts.getInt(TAG_LIKES);

                    }else{
                        // product with id not found
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        });

        return null;
    }

This function is in my OnCreate function. When you click on a button you shall increase the int value by one!

        like.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                System.out.println("Vorher: " +likes);
                likes = (likes++);
                System.out.println("Nachher: " +likes);
                new Like().execute();
            }
        });

That is the function with my list.

protected String doInBackground(String... args) {

         List<NameValuePair> params = new ArrayList<NameValuePair>();
         params.add(new BasicNameValuePair("id", cid));
         params.add(new BasicNameValuePair(TAG_LIKES, Integer.toString(likes)));

    // getting JSON Object
    // Note that create product url accepts POST method
         JSONObject json = jParser.makeHttpRequest(url_like,"POST", params);

    // check log cat for response
    Log.d("Create Response", json.toString());

    return null;
    }

This is my JSONParser:

if(method == "POST"){
            // request method is POST
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setEntity(new UrlEncodedFormEntity(params));

            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            json = EntityUtils.toString(httpEntity, HTTP.UTF_8);
            System.out.println("JSON: " + json);

and finally my PHP File:

<?php

/*
 * Following code will update a product information
 * A product is identified by product id (pid)
 */

// array for JSON response
$response = array();

// check for required fields
if (isset($_POST['likes']) && isset($_POST['id'])) {

$id = $_POST['id'];
$likes = $_POST['likes'];

// include db connect class
require_once (connection);

// connecting to db
$db = new DB_CONNECT();

// mysql update row with matched pid
$result = mysql_query("UPDATE Charts SET likes = '$likes' WHERE id = '$id'");

// check if row inserted or not
if ($result) {
    // successfully updated
    $response["success"] = 1;
    $response["message"] = "Like erfolgreich";

    // echoing JSON response
    echo json_encode($response);
} else {

}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Ein Fehler ist aufgetreten";

// echoing JSON response
echo json_encode($response);
}
?>

First of All, Your if condition in JSONParser never executed because,

Your if condition should be,

if(method.equals("POST"))

not a,

if(method == "POST")

second one,

Also, instead of using runOnUiThread in doInBackground() put your UI updation code in AsyncTask's onPostExecute() method.