模拟器没有显示消息框

我想显示一个消息框后从server.in得到一个JSON响应在数据库下面给出的代码正确更新，但消息框不显示。它只是显示“不幸的是，myapp已停止” message.i不知道代码出错的地方。代码中找不到错误。这里是我的java文件模拟器没有显示消息框

package com.example.loga; 

import android.os.Bundle; 

import android.app.Activity; 
import android.app.AlertDialog; 

import android.util.Log; 
import android.view.Menu; 
import android.widget.Button; 


import java.util.ArrayList; 
import java.util.List; 
import org.apache.http.NameValuePair; 
import org.apache.http.message.BasicNameValuePair; 
import org.json.JSONObject; 
import android.app.ProgressDialog; 
import android.os.AsyncTask; 
import android.view.View; 
import android.widget.EditText; 


public class MainActivity1 extends Activity { 

    private ProgressDialog pDialog; 

    JSONParser jsonParser = new JSONParser(); 
     EditText inputuserid; 
     EditText inputserverid; 

     private static String url_register = "http://10.0.2.2/android_connect/register.php"; 
     // JSON Node names 
     private static final String TAG_SUCCESS = "success"; 





    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main_activity1); 
     // Edit Text 
     inputuserid = (EditText) findViewById(R.id.editText1); 
     inputserverid= (EditText) findViewById(R.id.editText2); 
     Button button1 = (Button) findViewById(R.id.button1); 
     button1.setOnClickListener(new View.OnClickListener() 
     { 
      public void onClick(View view) { 
       // creating new product in background thread 
       new add().execute(); 
      } 
     }); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main_activity1, menu); 
     return true; 
    } 
    class add extends AsyncTask<String, String,String> { 

     /** 
     * Before starting background thread Show Progress Dialog 
     * */ 
     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      pDialog = new ProgressDialog(MainActivity1.this); 
      pDialog.setMessage("your Registration is processing..wait for few sec.."); 
      pDialog.setIndeterminate(false); 
      pDialog.setCancelable(true); 
      pDialog.show(); 
     } 

     /** 
     * Creating product 
     * */ 
     protected String doInBackground(String... args) { 
      return null; 

     } 

     /** 
     * After completing background task Dismiss the progress dialog 
     * **/ 
     protected void onPostExecute(String file_url) { 
       String userid = inputuserid.getText().toString(); 
       String serverid = inputserverid.getText().toString(); 

       // Building Parameters 
       List<NameValuePair> params = new ArrayList<NameValuePair>(2); 
       params.add(new BasicNameValuePair("userid",userid)); 
       params.add(new BasicNameValuePair("serverid", serverid)); 

      JSONObject json = jsonParser.makeHttpRequest(url_register, 
        "POST", params); 
      Log.d("Create Response", json.toString()); 
      try 
      { 
      int success = json.getInt(TAG_SUCCESS); 
       if (success == 1) { 

       AlertDialog alertDialog; 
       alertDialog = new AlertDialog.Builder(MainActivity1.this).create(); 
       alertDialog.setTitle("password verification.."); 
       alertDialog.setMessage("success.!!"); 
       alertDialog.show(); 

       finish(); 
      } else { 
       // failed to create product 
      } 
      } 
      catch (Exception e) { 
        e.printStackTrace(); 
       } 
      } 

     } 

    }

，我的PHP文件是：

<?php 
$response = array(); 
// check for required fields 
if (isset($_POST['userid']) && isset($_POST['serverid'])) 
{ 

    $userid = $_POST['userid']; 
    $serverid= $_POST['serverid']; 
     // include db connect class 
    require_once __DIR__ . '/db_connect.php'; 

    // connecting to db 
    $db = new DB_CONNECT(); 

    // mysql inserting a new row 
    $result = mysql_query("INSERT INTO opass(User_ID, Server_ID) VALUES('$userid', '$serverid')"); 


    // check if row inserted or not 
    if ($result) 
{ 
     // successfully inserted into database 
     $response["success"] = 1; 
     $response["message"] = " Registered successfully"; 

     // echoing JSON response 
     echo json_encode($response); 
    } 
else 
{ 
     // failed to insert row 
     $response["success"] = 0; 
     $response["message"] = "Oops! An error occurred."; 

     // echoing JSON response 
     echo json_encode($response); 
    } 
} 
else 
{ 
    // required field is missing 
    $response["success"] = 1; 
    $response["message"] = "Required field(s) is missing"; 

    // echoing JSON response 
    echo json_encode($response); 
} 
?>

所以我logcat的错误：

04-21 17:00:14.941: I/Choreographer(27578): Skipped 89 frames! The application may be doing too much work on its main thread. 
. 
. 
. 
. 
. 
4-21 17:00:14.921: E/AndroidRuntime(27578): FATAL EXCEPTION: AsyncTask #2 
04-21 17:00:14.921: E/AndroidRuntime(27578): java.lang.RuntimeException: An error occured while executing doInBackground() 
04-21 17:00:14.921: E/AndroidRuntime(27578): at android.os.AsyncTask$3.done(AsyncTask.java:299) 
04-21 17:00:14.921: E/AndroidRuntime(27578): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352) 
04-21 17:00:14.921: E/AndroidRuntime(27578): at java.util.concurrent.FutureTask.setException(FutureTask.java:219) 
04-21 17:00:14.921: E/AndroidRuntime(27578): at java.util.concurrent.FutureTask.run(FutureTask.java:239) 
04-21 17:00:14.921: E/AndroidRuntime(27578): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 
04-21 17:00:14.921: E/AndroidRuntime(27578): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 
04-21 17:00:14.921: E/AndroidRuntime(27578): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) 
04-21 17:00:14.921: E/AndroidRuntime(27578): at java.lang.Thread.run(Thread.java:856) 
04-21 17:00:14.921: E/AndroidRuntime(27578): Caused by: java.lang.NullPointerException 
04-21 17:00:14.921: E/AndroidRuntime(27578): at com.example.loga.MainActivity1$add.doInBackground(MainActivity1.java:97) 
04-21 17:00:14.921: E/AndroidRuntime(27578): at com.example.loga.MainActivity1$add.doInBackground(MainActivity1.java:1) 
04-21 17:00:14.921: E/AndroidRuntime(27578): at android.os.AsyncTask$2.call(AsyncTask.java:287) 
04-21 17:00:14.921: E/AndroidRuntime(27578): at java.util.concurrent.FutureTask.run(FutureTask.java:234) 
04-21 17:00:14.921: E/AndroidRuntime(27578): ... 4 more 
04-21 17:00:14.992: I/Choreographer(27578): Skipped 44 frames! The application may be doing too much work on its main thread. 
04-21 17:00:17.361: I/Choreographer(27578): Skipped 134 frames! The application may be doing too much work on its main thread. 
04-21 17:00:17.941: E/WindowManager(27578): Activity com.example.loga.MainActivity1 has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d28880 V.E..... R.....ID 0,0-240,77} that was originally added here 
04-21 17:00:17.941: E/WindowManager(27578): android.view.WindowLeaked: Activity com.example.loga.MainActivity1 has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d28880 V.E..... R.....ID 0,0-240,77} that was originally added here 
04-21 17:00:17.941: E/WindowManager(27578):  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354) 
04-21 17:00:17.941: E/WindowManager(27578):  at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216) 
04-21 17:00:17.941: E/WindowManager(27578):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) 
04-21 17:00:17.941: E/WindowManager(27578):  at android.app.Dialog.show(Dialog.java:281) 
04-21 17:00:17.941: E/WindowManager(27578):  at com.example.loga.MainActivity1$add.onPreExecute(MainActivity1.java:81) 
04-21 17:00:17.941: E/WindowManager(27578):  at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586) 
04-21 17:00:17.941: E/WindowManager(27578):  at android.os.AsyncTask.execute(AsyncTask.java:534) 
04-21 17:00:17.941: E/WindowManager(27578):  at com.example.loga.MainActivity1$1.onClick(MainActivity1.java:58) 
04-21 17:00:17.941: E/WindowManager(27578):  at android.view.View.performClick(View.java:4204) 
04-21 17:00:17.941: E/WindowManager(27578):  at android.view.View$PerformClick.run(View.java:17355) 
04-21 17:00:17.941: E/WindowManager(27578):  at android.os.Handler.handleCallback(Handler.java:725) 
04-21 17:00:17.941: E/WindowManager(27578):  at android.os.Handler.dispatchMessage(Handler.java:92) 
04-21 17:00:17.941: E/WindowManager(27578):  at android.os.Looper.loop(Looper.java:137) 
04-21 17:00:17.941: E/WindowManager(27578):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
04-21 17:00:17.941: E/WindowManager(27578):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-21 17:00:17.941: E/WindowManager(27578):  at java.lang.reflect.Method.invoke(Method.java:511) 
04-21 17:00:17.941: E/WindowManager(27578):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
04-21 17:00:17.941: E/WindowManager(27578):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
04-21 17:00:17.941: E/WindowManager(27578):  at dalvik.system.NativeStart.main(Native Method) 
04-21 17:00:17.941: I/Choreographer(27578): Skipped 317 frames! The application may be doing too much work on its main thread. 
04-21 17:05:16.065: I/Process(27578): Sending signal. PID: 27578 SIG: 9 
04-21 17:16:06.902: E/Trace(27969): error opening trace file: No such file or directory (2) 
04-21 17:16:08.042: I/Choreographer(27969): Skipped 107 frames! The application may be doing too much work on its main thread. 
04-21 17:16:08.122: D/gralloc_goldfish(27969): Emulator without GPU emulation detected. 
04-21 17:16:47.102: I/Choreographer(27969): Skipped 41 frames! The application may be doing too much work on its main thread. 
04-21 17:16:48.292: I/Choreographer(27969): Skipped 82 frames! The application may be doing too much work on its main thread. 
04-21 17:16:49.062: I/Choreographer(27969): Skipped 224 frames! The application may be doing too much work on its main thread. 
04-21 17:16:52.293: I/Choreographer(27969): Skipped 92 frames! The application may be doing too much work on its main thread. 
04-21 17:16:52.652: D/dalvikvm(27969): GC_CONCURRENT freed 152K, 11% free 2610K/2904K, paused 7ms+111ms, total 231ms 
04-21 17:16:53.564: I/Choreographer(27969): Skipped 89 frames! The application may be doing too much work on its main thread. 
04-21 17:16:54.021: D/InputEventConsistencyVerifier(27969): KeyEvent: ACTION_UP but key was not down. 
04-21 17:16:54.021: D/InputEventConsistencyVerifier(27969): in android.widget.EditText{40d27d40 VFED..CL .F....I. 90,74-228,104 #7f080007 app:id/editText2} 
04-21 17:16:54.021: D/InputEventConsistencyVerifier(27969): 0: sent at 109014528000000, KeyEvent { action=ACTION_UP, keyCode=KEYCODE_TAB, scanCode=15, metaState=0, flags=0x8, repeatCount=0, eventTime=109014528, downTime=109014528, deviceId=0, source=0x101 } 
04-21 17:16:54.721: I/Choreographer(27969): Skipped 109 frames! The application may be doing too much work on its main thread. 
04-21 17:16:56.826: I/Choreographer(27969): Skipped 89 frames! The application may be doing too much work on its main thread. 
04-21 17:16:57.531: I/Choreographer(27969): Skipped 275 frames! The application may be doing too much work on its main thread. 
04-21 17:16:57.831: D/AndroidRuntime(27969): Shutting down VM 
04-21 17:16:57.831: W/dalvikvm(27969): threadid=1: thread exiting with uncaught exception (group=0x40a71930) 
04-21 17:16:57.981: E/AndroidRuntime(27969): FATAL EXCEPTION: main 
04-21 17:16:57.981: E/AndroidRuntime(27969): android.os.NetworkOnMainThreadException 
04-21 17:16:57.981: E/AndroidRuntime(27969): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at libcore.io.IoBridge.connectErrno(IoBridge.java:127) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at libcore.io.IoBridge.connect(IoBridge.java:112) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at java.net.Socket.connect(Socket.java:842) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at com.example.loga.JSONParser.makeHttpRequest(JSONParser.java:51) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at com.example.loga.MainActivity1$add.onPostExecute(MainActivity1.java:97) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at com.example.loga.MainActivity1$add.onPostExecute(MainActivity1.java:1) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at android.os.AsyncTask.finish(AsyncTask.java:631) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at android.os.AsyncTask.access$600(AsyncTask.java:177) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at android.os.Looper.loop(Looper.java:137) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at android.app.ActivityThread.main(ActivityThread.java:5041) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at java.lang.reflect.Method.invokeNative(Native Method) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at java.lang.reflect.Method.invoke(Method.java:511) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
04-21 17:16:57.981: E/AndroidRuntime(27969): at dalvik.system.NativeStart.main(Native Method) 
04-21 17:16:58.221: D/dalvikvm(27969): GC_CONCURRENT freed 214K, 12% free 2812K/3164K, paused 71ms+19ms, total 322ms 
04-21 17:17:01.412: I/Process(27969): Sending signal. PID: 27969 SIG: 9 
04-21 17:17:02.322: E/Trace(28003): error opening trace file: No such file or directory (2) 
04-21 17:17:02.862: I/Choreographer(28003): Skipped 125 frames! The application may be doing too much work on its main thread. 
04-21 17:17:02.892: D/gralloc_goldfish(28003): Emulator without GPU emulation detected.

帮我找任何错误我做到了。谢谢:)

来源

2013-04-22 Loganayaki Palanisamy

使用调试，请参阅logcat..check错误..这将有助于.. – 2013-04-22 10:16:41

你怎么能确定这不失败？ JSONObject json = jsonParser.makeHttpRequest（url_register，“POST”，params）; – karmafunk 2013-04-22 10:18:08

logcat显示04-21 16：57：10.492：我/编舞（27578）：跳过了38帧！应用程序可能在其主线程上做了太多工作。 04-21 16：57：13.182：I /编舞师（27578）：跳过了104帧！应用程序可能在其主线程上做了太多工作。 04-21 16：57：13.842：I /编舞师（27578）：跳过了31帧！应用程序可能在其主线程上做了太多工作。 – 2013-04-22 10:18:52

你不能从UI thread

使用Handler或runOnUiThread()

编辑变化部不同的thread运行

AlertDialog alertDialog; 
    alertDialog = new AlertDialog.Builder(MainActivity1.this).create(); 
    alertDialog.setTitle("password verification.."); 
    alertDialog.setMessage("success.!!"); 
    alertDialog.show();

这个白衣对话框中这样：

runOnUiThread(new Runnable() { 

    @Override 
    public void run() { 

     AlertDialog alertDialog; 
     alertDialog = new AlertDialog.Builder(MainActivity1.this).create(); 
     alertDialog.setTitle("password verification.."); 
     alertDialog.setMessage("success.!!"); 
     alertDialog.show(); 
    } 

});

来源

2013-04-22 10:16:41 Blackbelt

我对这个.pls建议更新ant教程或链接 – 2013-04-22 10:20:40

请参阅我的编辑..... – Blackbelt 2013-04-22 10:22:44

感谢alot.i它仍在加载一条命令“您的注册正在处理..等待几秒..“3分钟。我的编码有什么问题？ – 2013-04-22 11:07:54

模拟器没有显示消息框

回答

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