的AsyncTask强制关闭

问题描述：

任何人都知道为什么的AsyncTask是强制关闭时，我尝试解压缩文件的背景，它不使用的AsyncTask的时候，所以我不知道我做错了工作：的AsyncTask强制关闭

public class UnzipFile extends AsyncTask<Void, Integer, String> {               
String zipFile = Environment.getExternalStorageDirectory() + "/download/" + mixtapefilename; 
String unzipLocation = Environment.getExternalStorageDirectory() + "/download/"; 

    @Override 
    protected void onPreExecute() {   
     Toast toast = Toast.makeText(getApplicationContext(), "Unzipping...", Toast.LENGTH_SHORT); 
     toast.show(); 

     /* Intent intent = new Intent(); 
     final PendingIntent pendingIntent = PendingIntent.getActivity(Download.this, 0, intent, 0); 

     // configure the notification 
     notification = new Notification(R.drawable.zipicon, "Unzipping...", System 
       .currentTimeMillis()); 
     notification.flags = notification.flags | Notification.FLAG_ONGOING_EVENT; 
     notification.setLatestEventInfo(getApplicationContext(), "Please Wait", "Unzipping...", pendingIntent); 
     notificationManager2.notify(1, notification);*/ 

    } 

    @Override 
    protected String doInBackground(Void... params) {       
     Decompress d = new Decompress(zipFile, unzipLocation); 
     d.unzip();    

     return "success";}        

    @Override 
    protected void onPostExecute(String result) { 
     Toast toast = Toast.makeText(getApplicationContext(), "Download Complete", Toast.LENGTH_SHORT); 
     toast.show(); 
     File oldzip = new File(zipFile); 
     boolean deleted = oldzip.delete(); 
     sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory()))); 
     /*notificationManager2.cancel(1);*/        
    } 
}

和那么这里是我的，我想既然你正在使用AsynTask你不能用内部doInBackground主UI线程（即显示敬酒消息）（）沟通，在后台

public class Decompress { 
     byte[] buffer = new byte[1024]; 
     int length; 
     private String _zipFile; 
     private String _location; 

     public Decompress(String zipFile, String location) { 
     _zipFile = zipFile; 
     _location = location; 
     File a = new File(_location + foldername); 
     if(!a.isDirectory()){ 
      a.mkdirs(); 
     }       

     _dirChecker(""); 
     } 

     public void unzip() { 

     try { 
      FileInputStream fin = new FileInputStream(_zipFile); 
      ZipInputStream zin = new ZipInputStream(fin); 
      ZipEntry ze = null; 
      while ((ze = zin.getNextEntry()) != null) { 


      if(ze.isDirectory()) { 
       _dirChecker(ze.getName()); 
      } else { 
       FileOutputStream fout = new FileOutputStream(_location + ze.getName()); 
       while ((length = zin.read(buffer))>0) { 
        fout.write(buffer, 0, length); 
        } 

       zin.closeEntry(); 
       fout.close(); 
      } 

      } 
      zin.close(); 
      Toast toast = Toast.makeText(getApplicationContext(),"Download Complete", Toast.LENGTH_LONG); 
      toast.show(); 
     } catch(Exception e) { 
      ProgressDialog dialog; 
     dialog = new ProgressDialog(Download.this);     
     dialog.setMessage(e.toString()); 
     dialog.show(); 
     } 

     } 

     private void _dirChecker(String dir) { 
     File f = new File(_location + dir); 


     if(!f.isDirectory()) { 
      f.mkdirs(); 
     } 
     } 
    }

将消息发布到UI消息队列中logcat正在吐出什么异常？ –

答

运行unzip部分。

与AsynTask在主UI线程通信的唯一方法是使用onPreExcute()或onPostExcute()

所以只要删除此行：

Toast toast = Toast.makeText(getApplicationContext(),"Download Complete", Toast.LENGTH_LONG);

谢谢，我打了信后就明白了。对不起这个毫无意义的问题。 –

答

对不起，不同意，但有几种方法从另一个线程在UI线程中执行代码： Activity.runOnUiThread（Runnable接口） View.post（Runnable接口） View.postDelayed（Runnable接口，长）你可以使用其中的一个才能发布，这将是EXE不管你现在使用的线程如何，都可以通过UI线程来创建。但是，你可以直接使用Log.d（String，String）代替（例如）

答

UI线程是非线程安全的。所以在其他线程中访问UI线程非常危险。您必须通过View.post()方法

的AsyncTask强制关闭

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