java - Android fragment 和 baseadapter 之间的通信

Question

需要专家意见我应该如何组织这个问题。我有一个驻留在 fragment 中的自定义方法 process_filter，因为它需要访问该 fragment 的私有(private) TextView 和 List。

在处理过程中，这个 fragment 会访问一个BaseAdapter，在这个BaseAdapter里面我需要使用back process_filter方法

基本结构如下:

MyFragment.java

public class MyFragment extends Fragment {

   private List<String> filter_list;
   private TextView no_of_filter;

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

   View view = inflater.inflate(R.layout.my_fragment_layout, container, false);
   no_of_filter = (TextView) view.findViewById(R.id.no_of_filter_tv);
   .
   MyAdapter custom_adapter = new MyAdapter(context, "string 1", "string 2");
   .
   process_filter("string 1", "string 2");
   .
   }

   public void process_filter(String in_preference, String current_value)
   {
       no_of_filter.setText(in_preference);
   }

MyAdapter.java

   class MyAdapter extends BaseAdapter {

       public View getView( final int position, View convertView, ViewGroup   parent)
       {
             holder.checkBox.setOnClickListener( new View.OnClickListener() {
                public void onClick(View v) {
                    //Here I need to access back process_filter from fragment 
                    process_filter ("string 1, string 2");
                }
             }
       }
   }

Answer 1

创建一个从适配器到 fragment 的接口(interface)。

在您的适配器中创建接口(interface)并将其传递给您的适配器的构造函数

class MyAdapter extends BaseAdapter {

    public interface IProcessFilter {
        void onProcessFilter(String string1, String string2)
    }

    private IProcessFilter mCallback;

    public MyAdapter(Context context, String string1, String string2, IProcessFilter callback) {
        mCallback = callback;
    }

    public View getView( final int position, View convertView, ViewGroup   parent)
    {
        holder.checkBox.setOnClickListener( new View.OnClickListener() {
            public void onClick(View v) {
                mCallback.onProcessFilter("string1", "string2");
            }
        }
   }
}

最后，像这样在你的 fragment 中实现它

public class MyFragment extends Fragment implements IProcessFilter {
    ...
    ...
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.my_fragment_layout, container, false);
        no_of_filter = (TextView) view.findViewById(R.id.no_of_filter_tv);

        MyAdapter custom_adapter = new MyAdapter(context, "string 1", "string 2", this);  
    }

    @Override
    public void onProcessFilter(String string1, String string2) {
        // Process the filter
    }
}