处理 Recyclerview 中的点击项

Question

我在vertical recycleview中有一个horizo​​ntal recycleview。

我在 horizo​​ntal recycleview 中添加列表 cardview。

在主Activity上点击item如何获取item信息？

谢谢

public class MainActivity extends AppCompatActivity {
        private RecyclerView recyclerView;
        private AlbumsVerticalAdapter adapter;
        private List<Album> albumList;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
            setSupportActionBar(toolbar);
            initCollapsingToolbar();
            recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
            albumList = new ArrayList<>();
            adapter = new AlbumsVerticalAdapter(this, albumList);
            recyclerView.setHasFixedSize(true);
            recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
            recyclerView.setAdapter(adapter);
        }

        private void initCollapsingToolbar() {}

        private void prepareAlbums() {}
    }


public class AlbumsVerticalAdapter extends RecyclerView.Adapter<AlbumsVerticalAdapter.MyViewHolder> {

    private Context mContext;
    private List<Album> albumList;

    //.............

    @Override
    public void onBindViewHolder(final MyViewHolder holder, int position) {
        Album album = albumList.get(position);
        holder.title.setText(album.getName());
        AlbumsHorizontalAdapter itemListDataAdapter = new AlbumsHorizontalAdapter(mContext, albumList);
        holder.recycler_view_list.setHasFixedSize(true);
        holder.recycler_view_list.setLayoutManager(new LinearLayoutManager(mContext, LinearLayoutManager.HORIZONTAL, false));
        holder.recycler_view_list.setAdapter(itemListDataAdapter);
    }

    @Override
    public int getItemCount() {
        return albumList.size();
    }
}

Answer 1

最好在你的ViewHolder 类上实现OnClickListener 并将监听器添加到你想要的视图中。

就像这样在onBindViewHolder(...) 添加setOnClickListener(...)：

@Override
public void onBindViewHolder(WordViewHolder holder, final int position) {

    //... 

    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(v.getContext(), position + "", Toast.LENGTH_SHORT).show();
        }
    });
}

Answer 2

查看您的代码，VerticalRecyclerViewAdapter 有一个 List<Albums>，并且此列表中的每个专辑都需要一个 Horizo​​ntalRecyclerViewAdapter 来保存另一个 List<Albums>。

在您的 VerticalRecylerViewAdapter 中创建 VerticalClickListener，它将由您的活动实现。在 Horizo​​ntalRecyclerViewAdapter 内部创建 HorizontalClickListener，它将由您的 VerticalRecyclerViewAdapter 为每个专辑实现。在为每个专辑创建 Horizo​​ntalRecyclerViewAdapter 时，也传入 vertical 位置。然后，当点击卡片视图时，HorizontalClickListener 可以返回适配器的垂直位置以及卡片视图的水平位置。 VerticalRecyclerViewAdapter 会将垂直和水平位置返回给您的活动。

Answer 3

首先，您创建一个类似的界面：

public interface OnItemClickListener{
    void onItemClick(View view, int position)
}

声明全局：

private OnItemClickListener mOnItemClickListener;

接下来，你需要一个像这样的构造器：

public MyAdapter(Context context, List data, OnItemClickListener mOnItemClickListener){
//...
this.mOnItemClickListener= mOnItemClickListener;

}

在 onBindViewHolder 中

@Override
public void onBindViewHolder(final FolderViewHolder holder, final int position) {
  //....
  holder.image.setOnClickListener(new View.OnItemClickListener){
        @Override
        public void onClick(View v) {
            mOnItemClickListener.onItemClick(v,position);    
        }
    });

}

最后，您可以在类使用适配器中实现回调，例如：

public class A extends AppCombatActivity implements MyAdapter.OnItemClickListener{
 //exist code
    @Override
    onItemClick(View view, int position){
     // Do something with view + position
  }

 }

Answer 4

 /Just try to implement the below code Snippet/

 First make an Interface Class "RecyclerView_ItemClickListener"

 public interface RecyclerView_ItemClickListener
 {
  void onClick(View view, int position);

  void onItemClick(View view, int position);
 }

 Then use this class in your Activity/Fragment and  inside Adapter.

 How to Implement in Adapter class:

 private RecyclerView_ItemClickListener clickListener;

 public void setClickListener(RecyclerView_ItemClickListener itemClickListener)
 {
    this.clickListener = itemClickListener;
 }

 public void SetOnItemClickListener(final RecyclerView_ItemClickListener mItemClickListener)
 {
    this.clickListener = mItemClickListener;
 }

Implement implements View.OnClickListener inside MyViewHolder Method 
of Adapter

 Example like this: class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener

itemView.setOnClickListener(this);


Then put the below code

@Override
    public void onClick(View view)
    {
        if (clickListener != null)
        {
            clickListener.onClick(view, getAdapterPosition());

            clickListener.onItemClick(view,getAdapterPosition());
        }
    }

After that implements RecyclerView_ItemClickListener inside your 
Activity/Fragment

in OnCreate:

your_Adapter.setClickListener(this);

your_Adapter.SetOnItemClickListener(this);

@Override
public void onClick(View view, int position)
{}

@Override
public void onItemClick(View view, int position)
{

}

Answer 5

创建接口

public interface OnItemClickListener{
    void onItemClick(View view, int position)
}

在适配器中添加参数化构造函数AlbumsVerticalAdapter

private OnItemClickListener mOnviewItemClickListener;
public AlbumsVerticalAdapter(Context context, List data, OnItemClickListener mOItemClickListener){
//...
this.mOnItemClickListener= mOnItemClickListener;

现在在适配器类的 OnBinderViewHolder 方法中添加这一行

@Override
public void onBindViewHolder(final FolderViewHolder holder, final int position) {
  //....
  mholder.mimageview.setOnClickListener(new View.OnItemClickListener){
        @Override
        public void onClick(View v) {
            mOnItemClickListener.onItemClick(v,position);    
        }
    });
}

在你的Activity中实现这个接口，使用item的onClick

 public class MainActivity extends AppCombatActivity implements AlbumsVerticalAdapter.OnItemClickListener{
        @Override
        onItemClick(View view, int position){
         // write your code 
      }

     }