Php Android远程服务器和mySql应用程序isn'；不起作用。空指针异常

我正在尝试制作一个简单的应用程序，允许用户使用用户名和密码注册，然后使用该用户名和密码登录。我已经创建了一个Apache服务器和一个MySql数据库，但是当我在手机上运行应用程序并尝试使用我已经手动添加到数据库中的用户名和密码登录时，尝试登录会花费很长时间，最终崩溃。我正在使用php脚本解析JSON数据。下面是我的java代码以及我的logcat。我不认为发布php脚本有什么意义，因为我不认为它们是问题所在，因为如果我尝试使用php脚本从我的计算机浏览器登录，它可以正常工作。请帮帮我

主要活动

package com.example.mysqltest;

import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{

private EditText user, pass;
private Button mSubmit, mRegister;
private ImageView imageView;

 // Progress Dialog
private ProgressDialog pDialog;

// JSON parser class
JSONParser jsonParser = new JSONParser();

//php login script location:

//localhost :
//testing on your device
//put your local ip instead,  on windows, run CMD > ipconfig
//or in mac's terminal type ifconfig and look for the ip under en0 or en1
// private static final String LOGIN_URL = "http://xxx.xxx.x.x:1234/webservice/login.php";

//testing on Emulator:
private static final String LOGIN_URL = "http://10.0.0.106:80/webservice/login.php";

//testing from a real server:
//private static final String LOGIN_URL = "http://www.yourdomain.com/webservice/login.php";

//JSON element ids from repsonse of php script:
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //setup input fields
    user = (EditText)findViewById(R.id.username);
    pass = (EditText)findViewById(R.id.password);

    //setup buttons
    mSubmit = (Button)findViewById(R.id.login);
    mRegister = (Button)findViewById(R.id.register);

    imageView = (ImageView) findViewById(R.id.imageView1);


    //register listeners
    mSubmit.setOnClickListener(this);
    mRegister.setOnClickListener(this);

}

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    switch (v.getId()) {
    case R.id.login:
            new AttemptLogin().execute();
        break;
    case R.id.register:
            Intent i = new Intent(this, Register.class);
            startActivity(i);
        break;

    default:
        break;
    }
}

class AttemptLogin extends AsyncTask<String, String, String> {

     /**
     * Before starting background thread Show Progress Dialog
     * */
    boolean failure = false;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(MainActivity.this);
        pDialog.setMessage("Attempting login...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }

    @Override
    protected String doInBackground(String... args) {
        // TODO Auto-generated method stub
         // Check for success tag
        int success;
        String username = user.getText().toString();
        String password = pass.getText().toString();
        try {
            // Building Parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("username", username));
            params.add(new BasicNameValuePair("password", password));

            Log.d("request!", "starting");
            // getting product details by making HTTP request
            JSONObject json = jsonParser.makeHttpRequest(
                   LOGIN_URL, "POST", params);

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

            // json success tag
                success = json.getInt(TAG_SUCCESS);
                if (success == 1) {
                    Log.d("Login Successful!", json.toString());
                                    // save user data
                    SharedPreferences sp =  
PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
                    Editor edit = sp.edit();
                    edit.putString("username", username);
                    edit.commit();

                Log.d("Login Successful!", json.toString());
                Intent i = new Intent(MainActivity.this, ReadComments.class);
                finish();
                startActivity(i);
                return json.getString(TAG_MESSAGE);
            }else{
                Log.d("Login Failure!", json.getString(TAG_MESSAGE));
                return json.getString(TAG_MESSAGE);

            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return null;

    }
    /**
     * After completing background task Dismiss the progress dialog
     * **/
    protected void onPostExecute(String file_url) {
        // dismiss the dialog once product deleted
        pDialog.dismiss();
        if (file_url != null){
            Toast.makeText(MainActivity.this, file_url, Toast.LENGTH_LONG).show();
        }

    }

}

}

package com.example.mysqltest；
导入java.net.URL；
导入java.net.URLConnection；
导入java.util.ArrayList；
导入java.util.List；
导入org.apache.http.NameValuePair；
导入org.apache.http.message.BasicNameValuePair；
导入org.json.JSONException；
导入org.json.JSONObject；
导入android.app.Activity；
导入android.app.ProgressDialog；
导入android.content.Intent；
导入android.content.SharedReferences；
导入android.content.SharedReferences.Editor；
导入android.graphics.Bitmap；
导入android.graphics.BitmapFactory；
导入android.os.AsyncTask；
导入android.os.Bundle；
导入android.preference.PreferenceManager；
导入android.util.Log；
导入android.view.view；
导入android.view.view.OnClickListener；
导入android.widget.Button；
导入android.widget.EditText；
导入android.widget.ImageView；
导入android.widget.Toast；
公共类MainActivity扩展活动实现OnClickListener{
私人编辑文本用户，通过；
私人按钮mSubmit，mRegister；
私人影像视图；
//进度对话框
私人对话；
//JSON解析器类
JSONParser JSONParser=新的JSONParser（）；
//php登录脚本位置：
//本地主机：
//在您的设备上进行测试
//将本地ip改为在windows上运行CMD>ipconfig
//或者在mac的终端类型ifconfig中，查找en0或en1下的ip
//私有静态最终字符串登录\u URL=”http://xxx.xxx.x.x:1234/webservice/login.php";
//在模拟器上测试：
私有静态最终字符串登录\u URL=”http://10.0.0.106:80/webservice/login.php";
//从真实服务器进行测试：
//私有静态最终字符串登录\u URL=”http://www.yourdomain.com/webservice/login.php";
//php脚本repsonse中的JSON元素ID：
私有静态最终字符串标记_SUCCESS=“SUCCESS”；
私有静态最终字符串标记_MESSAGE=“MESSAGE”；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
//TODO自动生成的方法存根
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
//设置输入字段
user=（EditText）findViewById（R.id.username）；
pass=（EditText）findViewById（R.id.password）；
//设置按钮
mSubmit=（按钮）findviewbyd（R.id.login）；
mRegister=（按钮）findviewbyd（R.id.register）；
imageView=（imageView）findViewById（R.id.imageView1）；
//注册侦听器
mSubmit.setOnClickListener（这个）；
mRegister.setOnClickListener（此）；
}
@凌驾
公共void onClick（视图v）{
//TODO自动生成的方法存根
开关（v.getId（））{
案例R.id.login：
新建AttemptLogin（）.execute（）；
打破
案例R.id.登记册：
意图i=新意图（这是Register.class）；
星触觉（i）；
打破
违约：
打破
}
}
类AttemptLogin扩展了AsyncTask{
/**
*在启动后台线程显示进度对话框之前
* */
布尔失败=假；
@凌驾
受保护的void onPreExecute（）{
super.onPreExecute（）；
pDialog=新建进度对话框（MainActivity.this）；
setMessage（“正在尝试登录…”）；
pDialog.setUndeterminate（假）；
pDialog.setCancelable（真）；
pDialog.show（）；
}
@凌驾
受保护的字符串doInBackground（字符串…args）{
//TODO自动生成的方法存根
//检查成功标签
成功；
字符串username=user.getText（）.toString（）；
字符串密码=pass.getText（）.toString（）；
试一试{
//建筑参数
List params=new ArrayList（）；
添加（新的BasicNameValuePair（“用户名”，用户名））；
添加（新的BasicNameValuePair（“密码”，password））；
Log.d（“请求！”，“启动”）；
//通过发出HTTP请求获取产品详细信息
JSONObject json=jsonParser.makeHttpRequest(
登录URL，“POST”，参数）；
//检查日志中的json响应
Log.d（“登录尝试”，json.toString（））；
//json成功标记
success=json.getInt（TAG_success）；
如果（成功==1）{
Log.d（“登录成功！”，json.toString（）；
//保存用户数据
SharedReferences sp=
PreferenceManager.GetDefaultSharedReferences（MainActivity.this）；
Editor edit=sp.edit（）；
edit.putString（“用户名”，用户名）；
edit.commit（）；
Log.d（“登录成功！”，json.toString（）；
意图i=新意图（MainActivity.this、ReadComments.class）；
完成（）；
星触觉（i）；
返回json.getString（TAG_消息）；
}否则{
Log.d（“登录失败！”，json.getString（TAG_MESSAGE））；
返回json.getString（TAG_消息）；
}
}捕获（JSONException e）{
e、 printStackTrace（）；
}
返回null；
}
/**
*完成后台任务后，关闭“进度”对话框
* **/
受保护的void onPostExecute（字符串文件\u url）{
//删除产品后关闭对话框
P
package com.example.mysqltest;

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

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class JSONParser {

static InputStream is = null;
static JSONObject jObj = null;
static String json = "";

// constructor
public JSONParser() {

}


public JSONObject getJSONFromUrl(final String url) {

    // Making HTTP request
    try {
        // Construct the client and the HTTP request.
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        // Execute the POST request and store the response locally.
        HttpResponse httpResponse = httpClient.execute(httpPost);
        // Extract data from the response.
        HttpEntity httpEntity = httpResponse.getEntity();
        // Open an inputStream with the data content.
        is = httpEntity.getContent();

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        // Create a BufferedReader to parse through the inputStream.
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        // Declare a string builder to help with the parsing.
        StringBuilder sb = new StringBuilder();
        // Declare a string to store the JSON object data in string form.
        String line = null;

        // Build the string until null.
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }

        // Close the input stream.
        is.close();
        // Convert the string builder data to an actual string.
        json = sb.toString();
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }

    // Try to parse the string to a JSON object
    try {
        jObj = new JSONObject(json);
    } catch (JSONException e) {
        Log.e("JSON Parser", "Error parsing data " + e.toString());
    }

    // Return the JSON Object.
    return jObj;

}


// function get json from url
// by making HTTP POST or GET mehtod
public JSONObject makeHttpRequest(String url, String method,
        List<NameValuePair> params) {

    // Making HTTP request
    try {

        // check for request method
        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();
            is = httpEntity.getContent();

        }else if(method == "GET"){
            // request method is GET
            DefaultHttpClient httpClient = new DefaultHttpClient();
            String paramString = URLEncodedUtils.format(params, "utf-8");
            url += "?" + paramString;
            HttpGet httpGet = new HttpGet(url);

            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
        }           

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        json = sb.toString();
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }

    // try parse the string to a JSON object
    try {
        jObj = new JSONObject(json);
    } catch (JSONException e) {
        Log.e("JSON Parser", "Error parsing data " + e.toString());
    }

    // return JSON String
    return jObj;

}
}

    09-08 11:45:02.765: I/Process(22450): Sending signal. PID: 22450 SIG: 9
09-08 11:45:47.730: D/libEGL(23410): loaded /system/lib/egl/libEGL_mali.so
09-08 11:45:47.735: D/libEGL(23410): loaded /system/lib/egl/libGLESv1_CM_mali.so
09-08 11:45:47.740: D/libEGL(23410): loaded /system/lib/egl/libGLESv2_mali.so
09-08 11:45:47.745: E/(23410): Device driver API match
09-08 11:45:47.745: E/(23410): Device driver API version: 23
09-08 11:45:47.745: E/(23410): User space API version: 23 
09-08 11:45:47.745: E/(23410): mali: REVISION=Linux-r3p2-01rel3 BUILD_DATE=Wed Oct  9 21:05:57   
KST 2013 
09-08 11:45:47.830: D/OpenGLRenderer(23410): Enabling debug mode 0
09-08 11:45:47.895: W/IInputConnectionWrapper(23410): showStatusIcon on inactive InputConnection
09-08 11:46:03.700: D/ProgressBar(23410): setProgress = 0
09-08 11:46:03.700: D/ProgressBar(23410): setProgress = 0, fromUser = false
09-08 11:46:03.700: D/ProgressBar(23410): mProgress = 0mIndeterminate = false, mMin = 0, mMax =   
10000
09-08 11:46:03.755: D/dalvikvm(23410): GC_FOR_ALLOC freed 282K, 14% free 9800K/11316K, paused 
23ms, total 29ms
09-08 11:46:03.755: I/dalvikvm-heap(23410): Grow heap (frag case) to 11.844MB for 1127536-byte 
allocation
09-08 11:46:03.775: D/dalvikvm(23410): GC_FOR_ALLOC freed 14K, 13% free 10887K/12420K, paused  
21ms, total 21ms
09-08 11:46:03.815: D/request!(23410): starting
09-08 11:46:03.855: D/ProgressBar(23410): updateDrawableBounds: left = 0
09-08 11:46:03.855: D/ProgressBar(23410): updateDrawableBounds: top = 0
09-08 11:46:03.855: D/ProgressBar(23410): updateDrawableBounds: right = 96
09-08 11:46:03.855: D/ProgressBar(23410): updateDrawableBounds: bottom = 96
09-08 11:48:22.855: D/dalvikvm(23410): GC_FOR_ALLOC freed 440K, 14% free 10959K/12628K, paused 
30ms, total 30ms
09-08 11:49:13.445: W/System.err(23410): org.apache.http.conn.HttpHostConnectException: 
Connection to http://10.0.0.106:80 refused
09-08 11:49:13.450: W/System.err(23410):    at  

09-08 11:49:13.450: W/System.err(23410):    at  
org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
09-08 11:49:13.450: W/System.err(23410):    at  
org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
09-08 11:49:13.450: W/System.err(23410):    at 
org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
09-08 11:49:13.455: W/System.err(23410):    at  
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:670)
09-08 11:49:13.455: W/System.err(23410):    at 
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:509)
09-08 11:49:13.455: W/System.err(23410):    at 
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
09-08 11:49:13.455: W/System.err(23410):    at 
com.example.mysqltest.JSONParser.makeHttpRequest(JSONParser.java:110)
09-08 11:49:13.460: W/System.err(23410):    at 
com.example.mysqltest.MainActivity$AttemptLogin.doInBackground(MainActivity.java:133)
09-08 11:49:13.460: W/System.err(23410):    at 
com.example.mysqltest.MainActivity$AttemptLogin.doInBackground(MainActivity.java:1)
09-08 11:49:13.460: W/System.err(23410):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
09-08 11:49:13.460: W/System.err(23410):    at 
java.util.concurrent.FutureTask.run(FutureTask.java:234)
09-08 11:49:13.460: W/System.err(23410):    at   
android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
09-08 11:49:13.460: W/System.err(23410):    at    
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
09-08 11:49:13.460: W/System.err(23410):    at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
09-08 11:49:13.460: W/System.err(23410):    at java.lang.Thread.run(Thread.java:841)
09-08 11:49:13.465: W/System.err(23410): Caused by: java.net.ConnectException: failed to connect   
to /10.0.0.106 (port 80): connect failed: ETIMEDOUT (Connection timed out)
09-08 11:49:13.470: W/System.err(23410):    at libcore.io.IoBridge.connect(IoBridge.java:114)
09-08 11:49:13.470: W/System.err(23410):    at   
java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
09-08 11:49:13.470: W/System.err(23410):    at 
java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
09-08 11:49:13.470: W/System.err(23410):    at java.net.Socket.connect(Socket.java:842)
09-08 11:49:13.475: W/System.err(23410):    at 
org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
09-08 11:49:13.475: W/System.err(23410):    at 
09-08 11:49:13.475: W/System.err(23410):    ... 15 more
09-08 11:49:13.475: W/System.err(23410): Caused by: libcore.io.ErrnoException: connect failed:    
ETIMEDOUT (Connection timed out)
09-08 11:49:13.475: W/System.err(23410):    at libcore.io.Posix.connect(Native Method)
09-08 11:49:13.475: W/System.err(23410):    at 
libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
09-08 11:49:13.480: W/System.err(23410):    at 
libcore.io.IoBridge.connectErrno(IoBridge.java:127)
09-08 11:49:13.480: W/System.err(23410):    at libcore.io.IoBridge.connect(IoBridge.java:112)
09-08 11:49:13.480: W/System.err(23410):    ... 20 more
09-08 11:49:13.480: E/Buffer Error(23410): Error converting result 
java.lang.NullPointerException:    
lock == null
09-08 11:49:13.480: E/JSON Parser(23410): Error parsing data org.json.JSONException: End of input 
at   
character 0 of 
09-08 11:49:13.480: W/dalvikvm(23410): threadid=11: thread exiting with uncaught exception  
(group=0x41c26700)
09-08 11:49:13.490: E/AndroidRuntime(23410): FATAL EXCEPTION: AsyncTask #1
09-08 11:49:13.490: E/AndroidRuntime(23410): java.lang.RuntimeException: An error occured while   
executing doInBackground()
09-08 11:49:13.490: E/AndroidRuntime(23410):    at 
android.os.AsyncTask$3.done(AsyncTask.java:299)
09-08 11:49:13.490: E/AndroidRuntime(23410):    at   
java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
09-08 11:49:13.490: E/AndroidRuntime(23410):    at 
java.util.concurrent.FutureTask.setException(FutureTask.java:219)
09-08 11:49:13.490: E/AndroidRuntime(23410):    at 
java.util.concurrent.FutureTask.run(FutureTask.java:239)
09-08 11:49:13.490: E/AndroidRuntime(23410):    at   
android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
09-08 11:49:13.490: E/AndroidRuntime(23410):    at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
09-08 11:49:13.490: E/AndroidRuntime(23410):    at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
09-08 11:49:13.490: E/AndroidRuntime(23410):    at java.lang.Thread.run(Thread.java:841)
09-08 11:49:13.490: E/AndroidRuntime(23410): Caused by: java.lang.NullPointerException
09-08 11:49:13.490: E/AndroidRuntime(23410):    at 
com.example.mysqltest.MainActivity$AttemptLogin.doInBackground(MainActivity.java:137)
09-08 11:49:13.490: E/AndroidRuntime(23410):    at 
com.example.mysqltest.MainActivity$AttemptLogin.doInBackground(MainActivity.java:1)
09-08 11:49:13.490: E/AndroidRuntime(23410):    at 
android.os.AsyncTask$2.call(AsyncTask.java:287)
09-08 11:49:13.490: E/AndroidRuntime(23410):    at   
java.util.concurrent.FutureTask.run(FutureTask.java:234)
09-08 11:49:13.490: E/AndroidRuntime(23410):    ... 4 more
09-08 11:49:22.300: I/Choreographer(23410): Skipped 508 frames!  The application may be doing too   
much work on its main thread.
09-08 11:49:22.500: W/IInputConnectionWrapper(23410): showStatusIcon on inactive InputConnection
09-08 11:49:22.650: E/WindowManager(23410): Activity com.example.mysqltest.MainActivity has 
leaked  
window com.android.internal.policy.impl.PhoneWindow$DecorView{426fbb68 V.E..... R......D 0,0- 
684,192}   
that was originally added here
09-08 11:49:22.650: E/WindowManager(23410): android.view.WindowLeaked: Activity 
com.example.mysqltest.MainActivity has leaked window    
com.android.internal.policy.impl.PhoneWindow$DecorView{426fbb68 V.E..... R......D 0,0-684,192}   
that   
was originally added here
09-08 11:49:22.650: E/WindowManager(23410):     at android.view.ViewRootImpl.<init>  
(ViewRootImpl.java:452)
09-08 11:49:22.650: E/WindowManager(23410):     at 
android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:258)
09-08 11:49:22.650: E/WindowManager(23410):     at   
android.view.WindowManagerImpl.addView(WindowManagerImpl.java:73)
09-08 11:49:22.650: E/WindowManager(23410):     at android.app.Dialog.show(Dialog.java:287)
09-08 11:49:22.650: E/WindowManager(23410):     at 
com.example.mysqltest.MainActivity$AttemptLogin.onPreExecute(MainActivity.java:115)
09-08 11:49:22.650: E/WindowManager(23410):     at   
android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
09-08 11:49:22.650: E/WindowManager(23410):     at 
android.os.AsyncTask.execute(AsyncTask.java:534)
09-08 11:49:22.650: E/WindowManager(23410):     at 
com.example.mysqltest.MainActivity.onClick(MainActivity.java:89)
09-08 11:49:22.650: E/WindowManager(23410):     at android.view.View.performClick(View.java:4475)
09-08 11:49:22.650: E/WindowManager(23410):     at    
android.view.View$PerformClick.run(View.java:18786)
09-08 11:49:22.650: E/WindowManager(23410):     at  
android.os.Handler.handleCallback(Handler.java:730)
09-08 11:49:22.650: E/WindowManager(23410):     at    
android.os.Handler.dispatchMessage(Handler.java:92)
09-08 11:49:22.650: E/WindowManager(23410):     at android.os.Looper.loop(Looper.java:176)
09-08 11:49:22.650: E/WindowManager(23410):     at 
android.app.ActivityThread.main(ActivityThread.java:5419)
09-08 11:49:22.650: E/WindowManager(23410):     at java.lang.reflect.Method.invokeNative(Native    
Method)
09-08 11:49:22.650: E/WindowManager(23410):     at   
java.lang.reflect.Method.invoke(Method.java:525)
09-08 11:49:22.650: E/WindowManager(23410):     at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
09-08 11:49:22.650: E/WindowManager(23410):     at     
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
09-08 11:49:22.650: E/WindowManager(23410):     at dalvik.system.NativeStart.main(Native Method)