android-从自定义适配器类调用的AsyncTask更新ListView [英] android - Updating ListView from AsyncTask called from custom adapter class

问题描述

我正在尝试从AsyncTask更新ListView.我有这种情况:

I am trying to update a ListView from an AsyncTask. I have this situation:

• 活动类从自定义Adapter类创建列表适配器.
• 适配器类在列表项中的元素上设置onClickListener，并调用位于不同实用程序类中的AsyncTask.

如何从实用程序AsyncTask中的onPostExecute()方法调用notifyDataSetChanged?

How can I call notifyDataSetChanged from onPostExecute() method in the Utilities AsyncTask?

推荐答案

包括一个 Delegate 作为回调，以从原始类中激活刷新.

Include a Delegate as a callback to activate the refresh from within the original class.

例如，添加以下界面:

public interface AsyncDelegate {

    public void asyncComplete(boolean success);


}

然后，在您的调用类中，实现该接口，并将其传递给您的任务

Then, in your calling class, implement the interface, and pass it to your task

public class MyClass implements AsyncDelegate  {

// Class stuff
MyAsyncTask newTask = new MyAsyncTask(this);
newTask.execute();

public void asyncComplete(boolean success){
    myAdapter.notifyDataSetChanged();

}

在AsyncTask中，返回结果:

In the AsyncTask, return the result:

private class MyAsyncTask extends AsyncTask<Object, Object, Object> {

   private AsyncDelegate delegate;

   public MyAsyncTask (AsyncDelegate delegate){
     this.delegate = delegate;
   }

   @Override
   protected void onPostExecute(String result) {
      delegate.asyncComplete(true);
   }

}

任务完成后，它将调用委托，这将触发刷新！

When the task completes, it will call the delegate, which will trigger the refresh!

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