从适配器调用 Fragment 方法 [英] Call a Fragment method from an Adapter

问题描述

我的片段中有一个方法 sendData().此方法启动一个新的 Activity.我想从我的 ArrayAdapter 调用这个方法.

I have a method sendData() in my fragment. This method starts a new Activity. I want to call this method from my ArrayAdapter.

这是我的代码:-

HomeFragment.java

HomeFragment.java

stagAdaper = new StaggeredAdapter(myContext, android.R.layout.simple_list_item_1, getList);
            mGridView.setAdapter(stagAdaper);
    private void sendData(int position)
    {

        myDialog = new ProgressDialog(myContext).show(getActivity(), "Fetching news..", "Just a moment");

        myDialog.getWindow().setContentView(R.layout.openarticlewaitprogress);
        myDialog.getWindow().setTitle("Loading..");
        myDialog.getWindow().setLayout(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
         new  NewsDetails(myDialog);



            Intent nIntent = new Intent(getActivity(),Details.class);

               String Body=getList.get(position).getBody();

            newsIntent.putExtra("Body", Body);


            startActivity(nIntent);

    }

StaggeredAdapter.java

StaggeredAdapter.java

viewHolder.layGridLayout.setOnClickListener(new View.OnClickListener() 
    {

        @Override
        public void onClick(View v) 
        {
            // TODO Auto-generated method stub
            //viewHolder.layGridLayout.setForeground(R.drawable.foreground_selector);

        }
    });
    return convertView;
    }

我该怎么做?

推荐答案

这是我现在要使用的.下面提供了较旧的更简单"的解决方案.

Edit : Here is what I would use now. Older, "easier" solutions are available below.

MyFragment extends Fragment implements CustomAdapter.EventListener {

    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        CustomAdapter adapter = new CustomAdapter(..., this);

    }

    void onEvent(int data) {
        doSomething(data);
    }

}

CustomAdapter extends BaseAdapter {

    EventListener listener; 

    public interface EventListener {
        void onEvent(int data);   
    }

    public CustomAdapter(..., EventListener listener) {
        this.listener = listener; 
    }

    ...

}

现在我们可以从适配器的任何地方调用 listener.onEvent(data); 来触发片段中的方法.

Now from any place in the adapter we can call listener.onEvent(data); to trigger the method in the fragment.

此外，我们可以在适配器中添加另一个方法，例如registerListener(EventListener eventListener)，而不是通过构造函数提供侦听器，然后根据需要维护一个侦听器列表.

Moreover, instead of providing a listener through the constructor, we can add another method in the adapter such as registerListener(EventListener eventListener) and then maintain a list of listeners if needed.

旧答案:

解决方案1:使适配器成为您的片段的内部类，以便您可以直接调用该方法.

Solution 1 : Make the adapter an inner class of your fragment, so that you can call the method directly.

解决方案2:更新您的适配器构造函数以接受 Fragment 作为参数.

Solution 2 : Update your adapter constructor to accept the Fragment as a parameter.

类似:

customAdapter = new CustomAdapter(myContext, android.R.layout.simple_list_item_1, getList, HomeFragment.this);

并更新适配器的构造函数:

and update the constructor of the Adapter :

public CustomAdapter(Context context, int id, HomeFragment fragment) {
    this.fragment = fragment;
}

然后您使用片段变量调用方法.

then you call methods using the fragment variable.

fragment.doSomething();

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