android - 处理 Adapter/ViewHolder 中的点击事件

Question

目前:我在 onBindViewHolder 内的 Adapter 中实现点击事件，但我注意到执行此操作时适配器位置会弄乱。我做了一些研究，发现 this ，他说:

As for why it is better in the ViewHolder instead of in onBindViewHolder(), that is because onBindViewHolder() is called for each and every item and setting the click listener is an unnecessary option to repeat when you can call it once in your ViewHolder constructor.

他提到的例子是这样的:

public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnItemClickListener {
   public MyViewHolder(View view) {
      super(view);

      view.setOnClickListener(this);
   }

   @Override
   public void OnClick(View view) {
      // Get the item clicked
      // For this example, I'm assuming your data source is of type `List<MyObject>`
      MyObject myObject = mDataSource.get(getAdapterPosition());
      // Then you can do any actions on it, for example - 
      myObject.setChecked();
   }
}

这对我来说很有意义，但我的问题是我的 ViewHolder 中有一个 ImageButton 并且他的示例仅展示了如何处理 的点击事件>ViewHolder 本身。请先看看我的适配器目前的​​样子:

public class MyAdapter extends Adapter<MyAdapter.ViewHolder> {
    ArrayList<Bitmap> bitmapArrayList;
    Context context;
    LayoutInflater layoutInflater;
    View myLayoutView;
    ArrayList<PathModel> swingThumbPathList;
    ArrayList<PathModel> swingVideoPathList = new ArrayList();

    class ViewHolder extends android.support.v7.widget.RecyclerView.ViewHolder {
        TextView name;
        CircularImageView image;
        ImageButton viewholderOtions;

        ViewHolder(View itemView) {
            super(itemView);
        }
    }

    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        this.myLayoutView = LayoutInflater.from(this.context).inflate(R.layout.single_item, parent, false);
        return new ViewHolder(this.myLayoutView);
    }

    public void onBindViewHolder(ViewHolder myHolder, final int position) {
        final ViewHolder holder = myHolder;
        holder.viewholderOtions = (ImageButton) myLayoutView.findViewById(R.id.viewholderOptions);
        holder.name = (TextView) this.myLayoutView.findViewById(R.id.name);
        holder.image = (CircularImageView) this.myLayoutView.findViewById(R.id.image);
        holder.name.setText(Model.getPath());
        holder.image.setImageURI(Uri.parse(Model.getPath()));

        holder.viewholderOtions.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Toast.makeText(holder.itemView.getContext(), "Options was clicked", Toast.LENGTH_LONG).show();

                showPopupMenu(holder.viewholderOtions, position);

            }
        });

        holder.itemView.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                String uri = holder.name.getText().toString();

                Toast.makeText(holder.itemView.getContext(), uri, Toast.LENGTH_LONG).show();
            }


        });

    }

    private void showPopupMenu(final View view, final int position) {
        // inflate menu
        PopupMenu popup = new PopupMenu(view.getContext(), view);
        MenuInflater inflater = popup.getMenuInflater();
        inflater.inflate(R.menu.popup_menu, popup.getMenu());
        popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {

            @Override
            public boolean onMenuItemClick(MenuItem item) {
                switch (item.getItemId()) {
                    case R.id.delete:
                        //The correct position is being toasted
                        Toast.makeText(view.getContext(), position + "Delete", Toast.LENGTH_LONG).show();

                        return true;
                    case R.id.rename:
                        Toast.makeText(view.getContext(), "Rename", Toast.LENGTH_LONG).show();

                        return true;

                    default:

                        return true;
                }
            }

        });

        popup.show();
    }

我的问题

如何处理 ViewHolder 本身和 ViewHolder 内的 ImageButton 的点击事件？

Answer 1

回头看这个问题我笑了，所以在将近 2 年后回答我自己的问题。

使用问题中提供的相同逻辑，这就是您将如何将点击事件设置为 View 本身，以及 View 内的元素，在 viewholder 内而不是 onBindViewHolder

public class MyAdapter extends Adapter<MyAdapter.ViewHolder> {
    ArrayList<Bitmap> bitmapArrayList;
    Context context;
    LayoutInflater layoutInflater;
    View myLayoutView;
    ArrayList<PathModel> swingThumbPathList;
    ArrayList<PathModel> swingVideoPathList = new ArrayList();

    class ViewHolder extends android.support.v7.widget.RecyclerView.ViewHolder {
        TextView name;
        CircularImageView image;
        ImageButton viewholderOtions;

        ViewHolder(View itemView) {
            super(itemView);
            viewholderOtions = itemView.findViewById(R.id.viewholderOptions);
            videoName = itemView.findViewById(R.id.FilePath);
            videoThumb = itemView.findViewById(R.id.VideoThumbnail);
            //set OnClickListener's for the views we want click events for 
            itemView.setOnClickListener(this);
            viewholderOtions.setOnClickListener(this);
            videoThumb.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {
            //get the tag that we have set in onBindViewHolder
            int position = (int) v.getTag();
            if (v == viewholderOtions) {
                //viewholderOtions was selected, we can use the position above to see what item, as shown below:
                Log.e("viewholderOtions at position =", String.valueOf(position);
            }
            if (v == itemView){
                //itemView was selected, we can use the position above to see what item, as shown below:
                Log.e("itemView at position =", String.valueOf(position);
            }
            if (v == videoThumbvideoThumb){
                //itemView was selected, we can use the position above to see what item, as shown below:
                Log.e("videoThumbvideoThumb at position =", String.valueOf(position);
            }
        }


    }

    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        this.myLayoutView = LayoutInflater.from(this.context).inflate(R.layout.single_item, parent, false);
        return new ViewHolder(this.myLayoutView);
    }

    public void onBindViewHolder(ViewHolder myHolder, final int position) {
        //set a tag so we can retrieve the position via the tag
        myHolder.viewholderOtions.setTag(position);

        //Set text to holder.name
        holder.name.setText(Model.getPath());
        //a better option to below is to use a library like picasso to handle the image loading
        holder.image.setImageURI(Uri.parse(Model.getPath()));       

    }

}

但老实说，我仍然在 onBindViewHolder 中设置点击事件，然后我只是在我的 Activity 中为我的 RecyclerView 设置以下内容- recyclerView.setHasFixedSize(true);。正如我的问题中所述，通过这样做，位置不会弄乱。