Android ผมไม่สามารถInsert ข้อมูลเข้าไปใน MySQL ได้ครับ ทำตามตัวอย่างของแอดมินแล้วครับ

package com.example.rattapongt.myapplication;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends Activity {


    @SuppressLint("NewApi")
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Permission StrictMode
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }

        // btnSave
        final Button btnSave = (Button) findViewById(R.id.btnSave);
        // Perform action on click
        btnSave.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                if(SaveData())
                {
                    // When Save Complete
                }
            }
        });

    }

    public boolean SaveData()
    {

        // txtUsername,txtPassword,txtName,txtEmail,txtTel
        final EditText txtUsername = (EditText)findViewById(R.id.txtUsername);
        final EditText txtPassword = (EditText)findViewById(R.id.txtPassword);
        final EditText txtConPassword = (EditText)findViewById(R.id.txtConPassword);
        final EditText txtName = (EditText)findViewById(R.id.txtName);
        final EditText txtEmail = (EditText)findViewById(R.id.txtEmail);
        final EditText txtTel = (EditText)findViewById(R.id.txtTel);


        // Dialog
        final AlertDialog.Builder ad = new AlertDialog.Builder(this);

        ad.setTitle("Error! ");
        ad.setIcon(android.R.drawable.btn_star_big_on);
        ad.setPositiveButton("Close", null);

        // Check Username
        if(txtUsername.getText().length() == 0)
        {
            ad.setMessage("Please input [Username] ");
            ad.show();
            txtUsername.requestFocus();
            return false;
        }
        // Check Password
        if(txtPassword.getText().length() == 0 || txtConPassword.getText().length() == 0 )
        {
            ad.setMessage("Please input [Password/Confirm Password] ");
            ad.show();
            txtPassword.requestFocus();
            return false;
        }
        // Check Password and Confirm Password (Match)
        if(!txtPassword.getText().toString().equals(txtConPassword.getText().toString()))
        {
            ad.setMessage("Password and Confirm Password Not Match! ");
            ad.show();
            txtConPassword.requestFocus();
            return false;
        }
        // Check Name
        if(txtName.getText().length() == 0)
        {
            ad.setMessage("Please input [Name] ");
            ad.show();
            txtName.requestFocus();
            return false;
        }
        // Check Email
        if(txtEmail.getText().length() == 0)
        {
            ad.setMessage("Please input [Email] ");
            ad.show();
            txtEmail.requestFocus();
            return false;
        }
        // Check Tel
        if(txtTel.getText().length() == 0)
        {
            ad.setMessage("Please input [Tel] ");
            ad.show();
            txtTel.requestFocus();
            return false;
        }


        String url = "http://www.android.maco.co.th/saveADDData.php";

        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("sUsername", txtUsername.getText().toString()));
        params.add(new BasicNameValuePair("sPassword", txtPassword.getText().toString()));
        params.add(new BasicNameValuePair("sName", txtName.getText().toString()));
        params.add(new BasicNameValuePair("sEmail", txtEmail.getText().toString()));
        params.add(new BasicNameValuePair("sTel", txtTel.getText().toString()));

        /** Get result from Server (Return the JSON Code)
         * StatusID = ? [0=Failed,1=Complete]
         * Error	= ?	[On case error return custom error message]
         *
         * Eg Save Failed = {"StatusID":"0","Error":"Email Exists!"}
         * Eg Save Complete = {"StatusID":"1","Error":""}
         */

        String resultServer  = getHttpPost(url,params);

        /*** Default Value ***/
        String strStatusID = "0";
        String strError = "Unknow Status!";

        JSONObject c;
        try {
            c = new JSONObject(resultServer);
            strStatusID = c.getString("StatusID");
            strError = c.getString("Error");
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        // Prepare Save Data
        if(strStatusID.equals("0"))
        {
            ad.setMessage(strError);
            ad.show();
        }
        else
        {
            Toast.makeText(MainActivity.this, "Save Data Successfully", Toast.LENGTH_SHORT).show();
            txtUsername.setText("");
            txtPassword.setText("");
            txtConPassword.setText("");
            txtName.setText("");
            txtEmail.setText("");
            txtTel.setText("");
        }


        return true;
    }


    public String getHttpPost(String url,List<NameValuePair> params) {
        StringBuilder str = new StringBuilder();
        HttpClient client = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        try {
            httpPost.setEntity(new UrlEncodedFormEntity(params));
            HttpResponse response = client.execute(httpPost);
            StatusLine statusLine = response.getStatusLine();
            int statusCode = statusLine.getStatusCode();
            if (statusCode == 200) { // Status OK
                HttpEntity entity = response.getEntity();
                InputStream content = entity.getContent();
                BufferedReader reader = new BufferedReader(new InputStreamReader(content));
                String line;
                while ((line = reader.readLine()) != null) {
                    str.append(line);
                }
            } else {
                Log.e("Log", "Failed to download result..");
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str.toString();
    }




}

<?php

	$objConnect = mysqli_connect("localhost","root","yala2006");
	$objDB = mysqli_select_db("webappdb");
	
	/*** for Sample 
		$_POST["sUsername"] = "a";
		$_POST["sPassword"] = "b";
		$_POST["sName"] = "c";
		$_POST["sEmail"] = "d";
		$_POST["sTel"] = "e";
	*/

	$strUsername = $_POST["sUsername"];
	$strPassword = $_POST["sPassword"];
	$strName = $_POST["sName"];
	$strEmail = $_POST["sEmail"];
	$strTel = $_POST["sTel"];

	/*** Check Username Exists ***/
	$strSQL = "SELECT * FROM member WHERE Username = '".$strUsername."' ";
	$objQuery = mysqli_query($strSQL);
	$objResult = mysqli_fetch_array($objQuery);
	if($objResult)
	{
		$arr['StatusID'] = "0"; 
		$arr['Error'] = "Username Exists!";	
		echo json_encode($arr);
		exit();
	}

	/*** Check Email Exists ***/
	$strSQL = "SELECT * FROM member WHERE Email = '".$strEmail."' ";
	$objQuery = mysqli_query($strSQL);
	$objResult = mysqli_fetch_array($objQuery);
	if($objResult)
	{
		$arr['StatusID'] = "0"; 
		$arr['Error'] = "Email Exists!";	
		echo json_encode($arr);
		exit();
	}
	
	/*** Insert ***/
	$strSQL = "INSERT INTO member (Username,Password,Name,Email,Tel) VALUES ('".$strUsername."','".$strPassword."','".$strName."','".$strEmail."','".$strTel."')";

	$objQuery = mysqli_query($strSQL);
	if(!$objQuery)
	{
		$arr['StatusID'] = "0"; 
		$arr['Error'] = "Cannot save data!";	
	}
	else
	{
		$arr['StatusID'] = "1"; 
		$arr['Error'] = "";	
	}

	/**
		$arr['StatusID'] // (0=Failed , 1=Complete)
		$arr['Error'] // Error Message
	*/
	
	mysqli_close($objConnect);
	
	echo json_encode($arr);
?>