usernames และ passwords เมื่อกรอกข้อมูลจากมือถือจากนั้นกด login ข้อมูลตัวแปร urlParameters และ urlParameters2 ส่วน +usernames และ passwords เป็นค่าว่างทำให้ login ไม่ได้ แก้ไขตรงส่วนไหนครับ

package com.test;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;


public class MainActivity extends Activity {

    private ProgressDialog progress;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }

    public void sendPostRequest(View View) {
        new PostClass(this).execute();
    }


    private class PostClass extends AsyncTask<String, Void, Void> {

        private final Context context;

        public PostClass(Context c){

            this.context = c;
        }

        protected void onPreExecute(){
            progress= new ProgressDialog(this.context);
            progress.setMessage("Loading");
            progress.show();
        }

        @Override
        protected Void doInBackground(String... params) {

            try {
                EditText usernames = (EditText) findViewById(R.id.username);
                EditText passwords = (EditText) findViewById(R.id.password);

                final TextView outputView = (TextView) findViewById(R.id.showOutput);
                URL url = new URL("http://148.107.102.22/process.php");

                HttpURLConnection connection = (HttpURLConnection)url.openConnection();

                String urlParameters = "form_account="+usernames;
                String urlParameters2 = "form_password="+passwords;


                connection.setRequestMethod("POST");
                connection.setRequestProperty("USER-AGENT", "Mozilla/5.0");
                connection.setRequestProperty("ACCEPT-LANGUAGE", "en-US,en;0.5");
                connection.setDoOutput(true);
                DataOutputStream dStream = new DataOutputStream(connection.getOutputStream());
                dStream.writeBytes(urlParameters);
                dStream.flush();
                dStream.close();
                int responseCode = connection.getResponseCode();

                System.out.println("\nSending 'POST' request to URL : " + url);
                System.out.println("\nPost parameters : " + urlParameters);
                System.out.println("\nPost parameters : " + urlParameters2);
                System.out.println("Response Code : " + responseCode);

                final StringBuilder output = new StringBuilder("Request URL " + url);
                output.append(System.getProperty("line.separator") + "Request Parameters " + urlParameters);
                output.append(System.getProperty("line.separator") + "Request Parameters " + urlParameters2);
                output.append(System.getProperty("line.separator")  + "Response Code " + responseCode);
                output.append(System.getProperty("line.separator")  + "Type " + "POST");
                BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                String line = "";
                StringBuilder responseOutput = new StringBuilder();
                System.out.println("output===============" + br);
                while((line = br.readLine()) != null ) {
                    responseOutput.append(line);
                }
                br.close();

                output.append(System.getProperty("line.separator") + "Response " + System.getProperty("line.separator") + System.getProperty("line.separator") + responseOutput.toString());

                MainActivity.this.runOnUiThread(new Runnable() {

                    @Override
                    public void run() {
                       outputView.setText(output);
                        progress.dismiss();
                    }
                });


            } catch (MalformedURLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return null;
        }

        protected void onPostExecute() {
            progress.dismiss();
        }

    }
}