无法使用 php 和 mysql 登录安卓应用程序

我在 eclipse 中创建了一个 android 登录页面。并通过 wamp 服务器使用 php 代码将 mysql 数据库连接到页面。但是在运行php文件时，我收到错误

1） 警告：mysql_connect（） [function.mysql-connect]：用户 'root'@'localhost' （使用密码： YES） 在第 6 行的 C：''wamp''www''log''login.php 中被拒绝访问

2） 注意：用户"root"@'localhost'（使用密码：YES）在第 8 行的 C：''wamp''www''log''login.php 中的访问被拒绝

3） 警告：mysql_select_db（） 期望参数 2 是资源，布尔值在第 10 行的 C：''wamp''www''log''login.php 中给出

4）注意：未定义的索引：C：''wamp''www''log''login.php 第 12 行中的用户名

5）注意：未定义的索引：密码在 C：''wamp''www''log''login.php 第 13 行

6）未选择数据库

同样在模拟器中，我在"验证用户"后被停止。请帮助我。注意：我的mysql用户名和密码是"root"和"admin"屏幕1.java

package com.example.library;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class Screen1 extends Activity {
    Button b;
    EditText et,pass;
    TextView tv;
    HttpPost httppost;
    StringBuffer buffer;
    HttpResponse response;
    HttpClient httpclient;
    List<NameValuePair> nameValuePairs;
    ProgressDialog dialog = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_screen1);
        b = (Button)findViewById(R.id.loginBtn);  
        et = (EditText)findViewById(R.id.usernameET);
        pass= (EditText)findViewById(R.id.passwordET);
       // tv = (TextView)findViewById(R.id.);
        b.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                dialog = ProgressDialog.show(Screen1.this, "", 
                        "Validating user...", true);
                 new Thread(new Runnable() {
                        public void run() {
                            login();                          
                        }
                      }).start();               
            }
        });
    }
    void login(){
        try{            
            httpclient=new DefaultHttpClient();
            httppost= new HttpPost("http://localhost/log/login.php"); // make sure the url is correct.
            //add your data
            nameValuePairs = new ArrayList<NameValuePair>(2);
            // Always use the same variable name for posting i.e the android side variable name and php side variable name should be similar, 
            nameValuePairs.add(new BasicNameValuePair("username",et.getText().toString().trim()));  // $Edittext_value = $_POST['Edittext_value'];
            nameValuePairs.add(new BasicNameValuePair("password",pass.getText().toString().trim())); 
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            //Execute HTTP Post Request
            response=httpclient.execute(httppost);
            // edited by James from coderzheaven.. from here....
            ResponseHandler<String> responseHandler = new BasicResponseHandler();
            final String response = httpclient.execute(httppost, responseHandler);
            System.out.println("Response : " + response); 
            runOnUiThread(new Runnable() {
                public void run() {
                    tv.setText("Response from PHP : " + response);
                    dialog.dismiss();
                }
            });
            if(response.equalsIgnoreCase("User Found")){
                runOnUiThread(new Runnable() {
                    public void run() {
                        Toast.makeText(Screen1.this,"Login Success", Toast.LENGTH_SHORT).show();
                    }
                });
                startActivity(new Intent(Screen1.this, Screen2.class));
            }else{
                showAlert();                
            }
        }catch(Exception e){
            dialog.dismiss();
            System.out.println("Exception : " + e.getMessage());
        }
    }
    public void showAlert(){
        Screen1.this.runOnUiThread(new Runnable() {
            public void run() {
                AlertDialog.Builder builder = new AlertDialog.Builder(Screen1.this);
                builder.setTitle("Login Error.");
                builder.setMessage("User not Found.")  
                       .setCancelable(false)
                       .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                           public void onClick(DialogInterface dialog, int id) {
                           }
                       });                     
                AlertDialog alert = builder.create();
                alert.show();               
            }
        });
    }
}

activity_screen1.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/index"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.library.Screen1" >
     <TextView
              android:id="@+id/textView1"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_alignParentTop="true"
              android:layout_centerHorizontal="true"
              android:layout_marginTop="20dp"
              android:textColor="#ffffffff"
              android:text="Please signin"
              android:textAppearance="?android:attr/textAppearanceLarge" />
           <TextView
              android:id="@+id/textView2"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_alignParentLeft="true"
              android:layout_below="@+id/textView1"
              android:layout_marginTop="75dp"
              android:textColor="#ffffffff"
              android:layout_marginLeft="10dp"
              android:text="Rollno:"
          android:textAppearance="?android:attr/textAppearanceMedium" />
          <EditText
              android:id="@+id/usernameET"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_alignBottom="@+id/textView2"
              android:layout_marginLeft="35dp"
              android:textColor="#ffffffff"
              android:layout_toRightOf="@+id/textView2"
              android:hint="eg:201103005" >
              <requestFocus />
      </EditText>
      <TextView
              android:id="@+id/textView3"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:textColor="#ffffffff"
              android:layout_alignLeft="@+id/textView2"
              android:layout_below="@+id/textView2"
              android:layout_marginTop="40dp"
              android:text="Password:"
              android:textAppearance="?android:attr/textAppearanceMedium" />
      <EditText
          android:id="@+id/passwordET"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_alignBottom="@+id/textView3"
              android:layout_alignLeft="@+id/usernameET"
              android:layout_alignRight="@+id/usernameET"
              android:hint="*******"
              android:textColor="#ffffffff"
              android:inputType="textPassword" />
           <Button
               android:id="@+id/loginBtn"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:layout_below="@+id/passwordET"
               android:layout_centerHorizontal="true"
               android:layout_marginTop="95dp"
               android:background="@drawable/sign_in_button"
               android:onClick="jumpscreen2"/>

</RelativeLayout

PHP代码

<?php
$hostname_localhost ="localhost";
$database_localhost ="mydatabase";
$username_localhost ="root";
$password_localhost ="admin";
$localhost = mysql_connect($hostname_localhost,$username_localhost,$password_localhost)
or
trigger_error(mysql_error());
mysql_select_db($database_localhost, $localhost);
$username = $_POST['username'];
$password = $_POST['password'];
$query_search = "select * from tbl_user where username = '".$username."' AND password = '".$password. "'";
$query_exec = mysql_query($query_search) or die(mysql_error());
$rows = mysql_num_rows($query_exec);
//echo $rows;
 if($rows == 0) { 
 echo "No Such User Found"; 
 }
 else  {
    echo "User Found"; 
}
?>

<?php
$hostname_localhost ="localhost";
$database_localhost ="mydatabase";
$username_localhost ="root";
$password_localhost ="";
$localhost = mysql_connect($hostname_localhost,$username_localhost,$password_localhost)
or
trigger_error(mysql_error());
mysql_select_db($database_localhost, $localhost);
$username = $_POST['username'];
$password = $_POST['password'];
$query = "select * from tbl_user where username = '".$username."' AND password = '".$password. "'";
$result = @mysql_query($query);
if(!$result){
    die('ERROR: '.mysql_error());
}
else{
if( mysql_num_rows($result) > 0) {
    echo "User found 'n";
}
else{
    echo "not found";
}

} 
?>