AsyncTask與圖像和文字

我想加載視頻的視頻縮略圖和文件名文本在目錄中。由於目錄中可能有很多vidoes，我需要使用AsyncTask。當我把代碼放在AsyncTask的getView（）中時，我遇到了一堆錯誤。請告訴我我做錯了什麼。AsyncTask與圖像和文字

public class MainActivity extends ListActivity { 

String dirNameSlash = "/videos/"; 
String path = Environment.getExternalStorageDirectory() + dirNameSlash; 
String root_sd = Environment.getExternalStorageDirectory().toString(); 
String theFile = root_sd + "/videos/"; 

File dir = new File(path); 
{ 
    assert (dir.exists()); 
    assert (dir.isDirectory()); 

} 

String[] videoFileList = dir.list(); 

public class MyThumbnaildapter extends ArrayAdapter<String> { 

    public MyThumbnaildapter(Context context, int textViewResourceId, 
      String[] objects) { 
     super(context, textViewResourceId, objects); 
     // TODO Auto-generated constructor stub 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     // TODO Auto-generated method stub 

     View row = convertView; 
     if (row == null) { 
      LayoutInflater inflater = getLayoutInflater(); 
      row = inflater.inflate(R.layout.activity_main, parent, false); 
     } 

     TextView textfilePath = (TextView) row.findViewById(R.id.FilePath); 
     textfilePath.setText(videoFileList[position]); 
     ImageView imageThumbnail = (ImageView) row 
       .findViewById(R.id.Thumbnail); 

     Bitmap bmThumbnail; 
     bmThumbnail = ThumbnailUtils.createVideoThumbnail(path 
       + videoFileList[position], Thumbnails.MICRO_KIND); 
     imageThumbnail.setImageBitmap(bmThumbnail); 

     return row; 
    } 

} 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setListAdapter(new MyThumbnaildapter(MainActivity.this, 
      R.layout.activity_main, videoFileList)); 

    ListView lv = getListView(); 

}

來源

2013-10-22 user2250122

什麼是那些錯誤和哪裏是aysnctask – Raghunandan

我的變量不工作，因爲他們在MyThumbnailAdapter類。然後，我將該類的一部分移至AsyncTask，但這也不起作用。 – user2250122

你會得到什麼樣的錯誤？你有一些logcat顯示？同時，您的getView（）方法可能會遭受一些修改，您需要實現ViewHolder模式，其次您應該嘗試處理單獨線程中的位圖加載，您不希望有一個laggy列表視圖。 –