FATAL ИСКЛЮЧЕНИЕ: AsyncTask # 1 Произошла ошибка при выполнении doInBackground

Question

Помогите мне пожалуйста, я хочу сделать сканер штрих-кода и послал результат в моей базе данных, но у меня есть ошибки это мой код:

MainActivity.java

package common.TER2015; 

import java.io.IOException; 
import java.util.ArrayList; 

import org.apache.http.NameValuePair; 
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 youb.y.com.android.zxinglib.integrator.IntentIntegrator; 
import android.app.Activity; 
import android.app.ProgressDialog; 
import android.content.Intent; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.os.Handler; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.TextView; 
import android.widget.Toast; 
import dossier.android.ter.R; 

public class MainActivity extends Activity { 
    private Handler handler = new Handler(); 
    private TextView txtScanResult; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     txtScanResult = (TextView) findViewById(R.id.scan_result); 
     View btnScan = findViewById(R.id.scan_button); 

     // le boutton Scanner 
     btnScan.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       // dernièer paramètre se met à true pr la lumiére 
       IntentIntegrator.initiateScan(MainActivity.this, R.layout.capture, 
         R.id.viewfinder_view, R.id.preview_view, true); 
       Insert task = new Insert(); 
       task.execute(new String[]{"http://10.0.2.2:80/codebarre/insert.php"}); 
      } 

     }); 
    } 
    private class Insert extends AsyncTask<String, Void, Boolean>{ 
     ProgressDialog dialog = new ProgressDialog(MainActivity.this); 
     @Override 
     protected void onPreExecute() { 
     dialog.setMessage("Envoi en cours.."); 
     dialog.show(); 

     } 

     @Override 
     protected Boolean doInBackground(String... urls) { 


      for(String url : urls){ 
      try { 
       ArrayList<NameValuePair> pairs = new ArrayList<NameValuePair>(); 
       pairs.add(new BasicNameValuePair("codebarre", txtScanResult.getText().toString())); 
       HttpClient client = new DefaultHttpClient(); 
       HttpPost post = new HttpPost(url); 
       post.setEntity(new UrlEncodedFormEntity(pairs)); 
       client.execute(post); 

      } catch (ClientProtocolException e) { 
    Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_SHORT).show(); 
    return false; 
      } 
      catch (IOException e) { 
    Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_SHORT).show(); 
    return false; 
      } 
      } 

      return true; 
     } 

     @Override 
     protected void onPostExecute(Boolean result) { 
      if(result == true){ 
Toast.makeText(MainActivity.this, "Succée", Toast.LENGTH_SHORT).show(); } else{ 
Toast.makeText(MainActivity.this, "Echéq", Toast.LENGTH_SHORT).show(); 
      } 
      dialog.dismiss(); 
      } 
     } 
    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 
     switch (requestCode) { 
      case IntentIntegrator.REQUEST_CODE: 
       jim.h.common.android.zxinglib.integrator.IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data); 
       if (scanResult == null) { 
        return; 
       } 
       final String result = scanResult.getContents(); 
       if (result != null) { 
        handler.post(new Runnable() { 
         @Override 
         public void run() { 
          // txtScanResult.setText(result); 

         } 
         } 
        ); 
       } 
       break; 
      default: 
     }}} 

main.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:background="@android:color/white" 
    android:gravity="center" 
    android:orientation="vertical" > 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="80dp" 
     android:text="@string/scan_resut_lable" 
     android:textColor="#000" /> 

    <TextView 
     android:id="@+id/scan_result" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" /> 

    <Button 
     android:id="@+id/scan_button" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:gravity="center_horizontal|top" 
     android:text="@string/scan" /> 

    <ImageView 
     android:id="@drawable/upecnoir" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="200dp" 
     android:src="@drawable/upecnoir" /> 

</LinearLayout> 

Capture.xml

<?xml version="1.0" encoding="UTF-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" android:layout_height="fill_parent"> 

    <SurfaceView android:id="@+id/preview_view" 
     android:layout_width="fill_parent" android:layout_height="fill_parent" 
     android:layout_centerInParent="true" /> 

    <jim.h.common.android.zxinglib.view.ViewfinderView 
     android:id="@+id/viewfinder_view" android:layout_width="fill_parent" 
     android:layout_height="fill_parent" android:background="#00000000" /> 

    <TextView android:id="@+id/status_view" android:layout_width="wrap_content" 
     android:layout_height="wrap_content" android:layout_gravity="bottom|center_horizontal" 
     android:background="#00000000" android:text="@string/msg_default_status" 
     android:textColor="#ffffffff" android:textSize="14sp" /> 

</FrameLayout> 

insert.php

<?php 
//if (isset($_POST['codebr'])){ 
include_once("connection.php"); 
$codebarre = $_POST['codebarre']; 
mysql_query("insert into code(codeb) values('$codebarre')"); 
?> 
<html> 
<body> 
<form action="insert.php" method="post"> 
codebarre <input type="text" name="codebarre" /> <br/> 
<input type="submit" value ="Insert" /> 
</form> 
</body> 
</html> 

LogCat

06-10 04:25:26.550: W/dalvikvm(1658): threadid=12: thread exiting with uncaught exception (group=0xb1a55ba8) 
06-10 04:25:26.570: E/AndroidRuntime(1658): FATAL EXCEPTION: AsyncTask #1 
06-10 04:25:26.570: E/AndroidRuntime(1658): Process: dossier.android.ter, PID: 1658 
06-10 04:25:26.570: E/AndroidRuntime(1658): java.lang.RuntimeException: An error occured while executing doInBackground() 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at android.os.AsyncTask$3.done(AsyncTask.java:300) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at java.util.concurrent.FutureTask.setException(FutureTask.java:222) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at java.util.concurrent.FutureTask.run(FutureTask.java:242) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at java.lang.Thread.run(Thread.java:841) 
06-10 04:25:26.570: E/AndroidRuntime(1658): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at android.os.Handler.<init>(Handler.java:200) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at android.os.Handler.<init>(Handler.java:114) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at android.widget.Toast$TN.<init>(Toast.java:327) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at android.widget.Toast.<init>(Toast.java:92) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at android.widget.Toast.makeText(Toast.java:241) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at common.TER2015.MainActivity$Insert.doInBackground(MainActivity.java:82) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at common.TER2015.MainActivity$Insert.doInBackground(MainActivity.java:1) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at android.os.AsyncTask$2.call(AsyncTask.java:288) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
06-10 04:25:26.570: E/AndroidRuntime(1658):  ... 3 more 
06-10 04:25:32.350: I/Choreographer(1658): Skipped 234 frames! The application may be doing too much work on its main thread. 
06-10 04:30:26.730: I/Process(1658): Sending signal. PID: 1658 SIG: 9 

Пожалуйста Хель чтобы решить эту проблему.

Answer 1

Вы пытаетесь обновить UI (отображение сообщений Toast) внутри вашего блока try-catch от метода doInBackground() в вашей AsyncTask. Вы не можете сделать это. Вы можете использовать метод runOnUiThread, если вы хотите отображать сообщения Toast из doInBackground(). Пример:

catch (ClientProtocolException e) { 
    runOnUiThread(new Runnable() { 

     public void run() { 

      Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_SHORT).show(); 
      return false; 

     } 
    }); 

}