如何使用PHP连接android studio中的mysql数据库？

我正在尝试使用php和php conect连接到android工作室上的mysql，但问题是android代码。



我是什么尝试过：

I am trying to connect to mysql on android studio with php and php conect right but is the android code that is the problem.

What I have tried:

public class BackgroundWorker extends AsyncTask<String, Void, String> {
    Context context;
    ProgressDialog alertDialog;

    public BackgroundWorker(Context context){
        this.context = context;
    }
    @Override
    protected String doInBackground(String... params) {
        String type = params[0];
        String login_url = "http://127.0.0.0/login.php";
        if(type.equals("login")){
            try {
                String user_name = params[1];
                String user_pass = params[2];

                URL url = new URL(login_url);
                HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
                httpURLConnection.setRequestMethod("POST");
                httpURLConnection.setDoOutput(true);
                httpURLConnection.setDoInput(true);
                httpURLConnection.setUseCaches(false);
                OutputStream outputStream = httpURLConnection.getOutputStream(); //When it get to this line of code it jumps out to the exception 
                BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
                String post_data = URLEncoder.encode("user_name", "UTF-8")+"="+URLEncoder.encode(user_name, "UTF-8")+"&"
                        +URLEncoder.encode("user_pass", "UTF-8")+"="+URLEncoder.encode(user_name, "UTF-8");
                bufferedWriter.write(post_data);
                bufferedWriter.flush();
                bufferedWriter.close();
                outputStream.close();
                InputStream inputStream = httpURLConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));

                String result = "";
                String line = "";

                while ((line = bufferedReader.readLine()) != null) {
                    result += line;
                }

                bufferedReader.close();
                inputStream.close();
                httpURLConnection.disconnect();

                return result;
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) { //It jups to this exception and give an error
                e.printStackTrace();
            }
        }
        return null;
    }