java - 如何从 AsyncTask 中调用 notifyDataSetChanged()

Question

我有一个 ArrayAdapter，里面有一个 AsyncTask，但我不确定如何从 onPostExecute< 调用 notifyDataSetChanged/

例子:

public class ColorAdapter extends ArrayAdapter<Color> {

  List<Color> colorList;
  Context context;
  ....

  public ColorAdapter(Context context, List<Color> list) {
    this.context = context; this.colorList = list;  
  }

  public View getView (final int position, final View view, final ViewGroup parent) { 
   .....
  }

  class DeleteColorTask extends AsyncTask <String, String, String> {
   int colorId;
   DeleteColorTask (int colorId) {this.colorId = colorId;} 

   protected String doInBackgroud (String ... args) {
     //call to server to delete the color
     colorList.remove(colorList.indexOf(...));
   }
   protected void onPostExecute(String s) {
     //HOW CAN I CALL notifyDataSetChanged() here?? this.notifyDataSetChanged() doesn't work since I am inside DeleteColorTask class
   }
  }
}

我从我的 Activity 中这样调用上面的内容:

  adapter = new ColorAdapter(context, colorsList);
  setListAdapter(adapter);

Answer 1

你可以这样调用它:

ColorAdapter.this.notifyDataSetChanged();

顺便说一句，启动此 AsyncTask 的更合适的位置是它的主机 fragment/Activity ，为什么？AsyncTasks 有时会比您预期的停留时间更长，如果您没有适本地管理它们的生命周期，它们可能会造成麻烦。