将图像传递给同一 class 中的另一个函数

Question

三天来我一直在寻找解决方案。如果大家有idea请帮帮我，我什至觉得实现起来其实没有那么难，但是这不是我的分支，如果你能这样说的话。

在包含多个项目的列表的 RecyclerView 中，每个项目都有一个标题 (TextView) 和一个封面图像 (ImageView)。

此数据在 Adapter 中设置，在 ViewHolder 中，更具体地说在 OnBind 函数中设置。

那么我的问题在哪里？我创建了一个 PopUp Window，其中除了几个按钮外，还包含一个占位符 ImageView 和一个占位符 TextView。我似乎无法找到一种方法将单击项目的数据放在占位符内的列表中。我认为它类似于 OnBind 方法，但它不起作用。

这是适配器（如果需要 GameItem 的代码，我很乐意post）：

import java.util.ArrayList;

public class GameViewAdapter extends RecyclerView.Adapter<GameViewAdapter.GameViewHolder> {
    private ArrayList<GameItem> mGameList;
    private OnItemClickListener mListener;

    public interface OnItemClickListener{
        void onGameClick(int position);
    }
    public void setOnItemClickListener(OnItemClickListener listener){
        mListener =listener;
    }
    public static class GameViewHolder extends RecyclerView.ViewHolder{
        public ImageView Cover;
        public TextView Title;
        public TextView Description;
        public PopupWindow popupWindow;
        public ImageView popUpImage;
        public TextView PopUpTitle;
        public EditText customAmount;
        public Button add;
        private Button addcustom;
        private  Button exit;

        public GameViewHolder(final View itemView, final OnItemClickListener listener) {
            super(itemView);
            add = itemView.findViewById(R.id.addaverage);
            addcustom = itemView.findViewById(R.id.addcustom);
            popUpImage = itemView.findViewById(R.id.popupimg);
            PopUpTitle = itemView.findViewById(R.id.popuptitle);
            customAmount = itemView.findViewById(R.id.gameamount);
            Cover = itemView.findViewById(R.id.GameCover);
            Title = itemView.findViewById(R.id.GameTitle);
            Description = itemView.findViewById(R.id.GameAmount);
            exit = itemView.findViewById(R.id.exit);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    showPopUp();
                }
            });
        }

        public void showPopUp() {
            final View popupView = LayoutInflater.from(itemView.getContext()).inflate(R.layout.popup, null);
            final PopupWindow popupWindow = new PopupWindow(popupView, WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT);
            exit = popupView.findViewById(R.id.exit);
            exit.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    popupWindow.dismiss();
                }
            });
            popupWindow.showAtLocation(popupView, Gravity.CENTER, 0, 0);

        }
    }

    public GameViewAdapter(ArrayList<GameItem> gameList){
        mGameList = gameList;
    }





    @Override
    public GameViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        Context context = viewGroup.getContext();
        View v = LayoutInflater.from(context).inflate(R.layout.game_entry, viewGroup, false);
        GameViewHolder GVH = new GameViewHolder(v, mListener);
        return GVH;
    }


        @Override
    public void onBindViewHolder(@NonNull GameViewHolder gameViewHolder, int position){
        GameItem currentItem = mGameList.get(position);
        Glide.with(gameViewHolder.Cover).load(currentItem.getCover()).into(gameViewHolder.Cover);
        gameViewHolder.Title.setText(currentItem.getTitle());
        gameViewHolder.Description.setText(currentItem.getDescription());

    }

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

Answer 1

In the OnBind method, the Image and Text are associated to the Items correctly, through Glide and gameViewHolder.Title.setText(currentItem.getTitle());. Now, I have created a PopUp, which should get the Image and the Text from the clicked item in the RecyclerView.

为了清楚起见，我重新排列了一些方法和属性，接下来，我将进行解释。

public class GameViewAdapter extends RecyclerView.Adapter<GameViewAdapter.GameViewHolder> {

    private ArrayList<GameItem> mGameList;
    private OnItemClickListener mListener;

    public GameViewAdapter(ArrayList<GameItem> mGameList, GameViewAdapter.OnItemClickListener mListener) {
        this.mGameList = mGameList;
        this.mListener = mListener;
    }

    @Override
    public GameViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        Context context = viewGroup.getContext();
        View v = LayoutInflater.from(context).inflate(R.layout.game_entry, viewGroup, false);
        GameViewHolder GVH = new GameViewHolder(v, mListener);
        return GVH;
    }

    @Override
    public void onBindViewHolder(@NonNull GameViewHolder gameViewHolder, int position){
        gameViewHolder.bind(mGameList.get(position));
    }

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

    class GameViewHolder extends RecyclerView.ViewHolder {

        private ImageView itemCover;
        private TextView itemTitle;
        private TextView itemDescription;
        private PopupWindow popupWindow;
        private ImageView popUpImage;
        private TextView PopUpTitle;
        private EditText customAmount;
        private Button add;
        private Button addcustom;
        private Button exit;

        public GameViewHolder(View itemView, GameViewAdapter.OnItemClickListener mListener) {
            super(itemView);
            setupViews(itemView);
        }

        public void bind(GameItem gameItem) {
            Glide.with(this.itemCover).load(gameItem.getCover()).into(this.itemCover);
            this.itemTitle.setText(gameItem.getTitle());
            this.itemDescription.setText(gameItem.getDescription());
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    showPopUp(itemView, gameItem);
                }
            });
        }

        private void setupViews(View itemView) {
            add = itemView.findViewById(R.id.addaverage);
            addcustom = itemView.findViewById(R.id.addcustom);
            popUpImage = itemView.findViewById(R.id.popupimg);
            PopUpTitle = itemView.findViewById(R.id.popuptitle);
            customAmount = itemView.findViewById(R.id.gameamount);
            itemCover = itemView.findViewById(R.id.GameCover);
            itemTitle = itemView.findViewById(R.id.GameTitle);
            itemDescription = itemView.findViewById(R.id.GameAmount);
            exit = itemView.findViewById(R.id.exit);
        }

        private void showPopUp(View itemView, GameItem gameItem) {
            final View popupView = LayoutInflater.from(itemView.getContext()).inflate(R.layout.popup, null);
            final PopupWindow popupWindow = new PopupWindow(popupView, WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT);

            final ImageView popupItemCover = popupView.findViewById(R.id.popupItemCover);
            final TextView popupItemTitle = popupView.findViewById(R.id.popupItemTitle);

            Glide.with(popupItemCover).load(gameItem.getCover()).into(popupItemCover);
            popupItemTitle.setText(gameItem.getTitle());

            exit = popupView.findViewById(R.id.exit);
            exit.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    popupWindow.dismiss();
                }
            });
            popupWindow.showAtLocation(popupView, Gravity.CENTER, 0, 0);
        }

    }

    public interface OnItemClickListener{
        void onGameClick(int position);
    }
}

发生了什么变化？首先，我们现在在 ViewHolder 中有一个名为 bind 的方法，我们负责设置 Adapter 中的数据并将其委托给 ViewHolder。其次，由于每次调用 onBindViewHolder 时都会调用该方法，因此您将获得实际的 GameItem。所以？对于该项目，我们现在在 bind 方法中设置它，而不是在 GameViewHolder 构造函数中设置 onClickListener 以打开 PopUp。但是，它有什么好处呢？每次我们将数据绑定到它的视图时，我们准备 Popup 然后显示它。

应该改变什么？出于性能目的，我想，您应该实例化构造函数，然后每次都用新数据填充它，而不是每次调用 onBindViewHolder 时都重新创建一个新实例。

编辑：由于我不知道您的弹出视图 ID，因此我创建了一些虚拟 ID。希望你明白。

最佳。

将图像传递给同一 class 中的另一个函数

Pass Image to another function within same class

java

arrays

android

image

popupwindow