具有多个布局的RecyclerView，插入/删除功能和单击侦听器

2024-05-03 • 问答

我正在开发一个工作评估应用程序，该应用程序将信息存储在房间数据库中，并通过RecyclerView保留对它的引用，用户可以使用该视图访问数据并根据需要进行更改。

我正在通过Fragment内带有Observer方法的视图模型使用Live Data检索对信息的引用。当用户填写表格并按下保存按钮时，此信息将存储在数据库中。

目前，我已经开发了两个标准适配器，它们具有不同的数据集和单独的布局。

public class HallDetailAdapter extends RecyclerView.Adapter<HallDetailAdapter.myViewHolder> {
private List<HallDetails> mHallDetails;

public void setHallDetails(final List<HallDetails> hallDetails) {
    this.mHallDetails = hallDetails;
    notifyDataSetChanged();
}
@NonNull
@Override
public HallDetailAdapter.myViewHolder onCreateViewHolder(@NonNull final ViewGroup parent,final int viewType) {
    View view = LayoutInflater.from(parent.getcontext()).inflate(R.layout.cardview_design,parent,false);
    return new myViewHolder(view);
}

@Override
public void onBindViewHolder(@NonNull final HallDetailAdapter.myViewHolder holder,final int position) {
    if(mHallDetails != null){
        HallDetails details = mHallDetails.get(position);
        holder.mTextView.setText(details.getName());
    }else{
        holder.mTextView.setText("No Data Entry");
    }

}

@Override
public int getItemCount() {
    if(mHallDetails != null)
        return mHallDetails.size();
    else return 0;
}
class myViewHolder extends RecyclerView.ViewHolder{
    private TextView mTextView;

    public myViewHolder(@NonNull final View itemView) {
        super(itemView);
        mTextView = itemView.findViewById(R.id.display_name);
    }
}

}

public class RoomDetailsAdapter extends RecyclerView.Adapter<RoomDetailsAdapter.myViewHolder> {

private List<RoomDetails> mRoomDetails;


public void setRoomDetails(final List<RoomDetails> roomDetails) {
    this.mRoomDetails = roomDetails;
    notifyDataSetChanged();
}

@NonNull
@Override
public RoomDetailsAdapter.myViewHolder onCreateViewHolder(@NonNull final ViewGroup parent,final int viewType) {
    View view = LayoutInflater.from(parent.getcontext()).inflate(R.layout.cardview_design2,false);
    return new myViewHolder(view);
}

@Override
public void onBindViewHolder(@NonNull final RoomDetailsAdapter.myViewHolder holder,final int position) {
    if(mRoomDetails != null) {
        RoomDetails details = mRoomDetails.get(position);
        holder.mTextView.setText(details.getName());
    }else{
        holder.mTextView.setText("No data entry");
    }

}

@Override
public int getItemCount() {
    if(mRoomDetails != null){
        return mRoomDetails.size();
    }else return 0;
}
public class myViewHolder extends RecyclerView.ViewHolder{
    private TextView mTextView;

    public myViewHolder(@NonNull final View itemView) {
        super(itemView);
        mTextView = itemView.findViewById(R.id.display_roomDetails);
    }
}

在Fragment内部调用的更改方法：

 dataViewModel.getName().observe(getactivity(),new Observer<List<HallDetails>>() {
        @Override
        public void onChanged(final List<HallDetails> hallDetails) {
            if(hallDetails != null) {
                hallDetailAdapter.setHallDetails(hallDetails);
            }
        }
    });

    dataViewModel.getGetName2().observe(getactivity(),new Observer<List<RoomDetails>>() {
        @Override
        public void onChanged(final List<RoomDetails> roomDetails) {
            if(roomDetails != null) {
                roomDetailsAdapter.setRoomDetails(roomDetails);
            }
        }
    });

我的问题是，如何在遵守这些功能的同时将多个布局集成到RecyclerView中？

在回收者视图中添加和删除项目
每个显示的项目都有一个点击侦听器
在相应的布局内显示数据，该数据已通过实时数据进行了更新，已在适配器内部进行了引用。

谢谢您的帮助！

niuhenan 回答：具有多个布局的RecyclerView，插入/删除功能和单击侦听器

要在单个RecyclerView中显示多个布局，必须在recyclerview适配器类中使用多个Viewholder。

例如，一个视图用于显示数据，另一个视图用于显示数据项之间的Admob / facebook广告。因此，您的适配器类如下所示代码。

public class StatusImageAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

private ArrayList<String> images;
private String path;
private Context context;
OnIteamClickListner listner;
private String status;

private static final int AD_VIEW_HOLDER = 0;
private static final int CONTENT_VIEW_HOLDER = 1;

public StatusImageAdapter(Context context,ArrayList<String> images,String path,OnIteamClickListner listner,String status) {
    this.images = images;
    this.path = path;
    this.context = context;
    this.listner = listner;
    this.status = status;
}

public interface OnIteamClickListner {
    void onIteamClick(View view,String action,int position,String path);

}

@Override
public int getItemViewType(int position) {

    if (position % Const.ITEMS_PER_AD == 0 && position>1)
        return AD_VIEW_HOLDER;
    return CONTENT_VIEW_HOLDER;

}

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


@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
    switch (viewType) {
        case AD_VIEW_HOLDER:

            View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.admob_banner_row_item,parent,false);
            return new AdViewHolder(itemView);
        case CONTENT_VIEW_HOLDER:
            // fall through
        default:
            View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.image_item,null);
            return new ContentViewHolder(itemLayoutView);

    }
}

@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder,final int position) {
    int viewType = getItemViewType(position);
    switch (viewType) {
        case AD_VIEW_HOLDER:
            AdViewHolder adViewHolder= (AdViewHolder) holder;
            adViewHolder.adView.setVisibility(View.GONE);
            CommonMethods.loadAd(context,adViewHolder.adView);
            break;
        case CONTENT_VIEW_HOLDER:
            ContentViewHolder contentViewHolder = (ContentViewHolder) holder;
            Bitmap bitmap = BitmapFactory.decodeFile( images.get(position));
            contentViewHolder.imageView.setImageBitmap(bitmap);
            if (status.equals(Const.ONLINE)) {
                contentViewHolder.img_download.setBackgroundResource(R.drawable.ic_download_black);
            }
            if (status.equals(Const.OFLINE)) {
                contentViewHolder.img_download.setBackgroundResource(R.drawable.ic_delete);
            }

            contentViewHolder.imageView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    listner.onIteamClick(view,"View",position,path);
                }
            });
            contentViewHolder.img_view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    listner.onIteamClick(view,"QuickView",path);

                }
            });
            contentViewHolder.img_download.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if (status.equals(Const.ONLINE)) {
                        listner.onIteamClick(view,"Download",path);
                    }
                    if (status.equals(Const.OFLINE)) {
                        listner.onIteamClick(view,"Delete",path);
                    }

                }
            });

            contentViewHolder.img_share.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    listner.onIteamClick(view,"Share",path);

                }
            });
    }


}

private class AdViewHolder extends RecyclerView.ViewHolder {
    AdView adView;

    public AdViewHolder(View itemView) {
        super(itemView);
        adView=itemView.findViewById(R.id.adView);
    }
}

private class ContentViewHolder extends RecyclerView.ViewHolder {
    ImageView imageView;
    ImageView img_share,img_download,img_view;

    public ContentViewHolder(View itemLayoutView) {
        super(itemLayoutView);
        imageView = itemView.findViewById(R.id.statusItem_imageView);
        img_share = itemView.findViewById(R.id.img_share);
        img_download = itemView.findViewById(R.id.img_download);
        img_view = itemView.findViewById(R.id.img_view);
    }
}

}

从您的活动课程文件中调用此适配器。

StatusImageAdapter statusImageAdapter = new StatusImageAdapter(context,imageFiles,hiddenpath.getAbsolutePath(),this,Const.ONLINE);

android android-fragments android-recyclerview android-studio

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具有多个布局的RecyclerView，插入/删除功能和单击侦听器

niuhenan 回答：具有多个布局的RecyclerView，插入/删除功能和单击侦听器

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