在 Recyclerview 中实现 Onclick [重复]

Question

我在尝试在我的 Recyclerview 上实现 Onclick 方法时遇到了一些问题。我有一个显示图标和标题的列表。我知道如何从一项活动转到另一项活动，但我不知道应该把它放在哪里。这是我的适配器。我试图在图像图标上实现 Onclick，我应该像使用删除图标那样做吗？谢谢！

ublic class MyAdapter extends RecyclerView.Adapter<MyAdapter.ExampleViewHolder> {
private  ArrayList<listaMat> matArrayList;
private OnItemClickListener mListener;

public  interface  OnItemClickListener {
    void onItemClick(int position);
    void onDeleteClick(int position);
}

public void setOnItemClickListener(OnItemClickListener listener){
    mListener = listener;
}

public static class  ExampleViewHolder extends RecyclerView.ViewHolder{
    public ImageView mImageview;
    public TextView mTextView;
    public ImageView mDeleteImg;

    public ExampleViewHolder(View itemView, OnItemClickListener listener) {
        super(itemView);
        mImageview = itemView.findViewById(R.id.img_list);
        mTextView = itemView.findViewById(R.id.txt_list);
        mDeleteImg = itemView.findViewById(R.id.img_delete);

        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (listener != null){
                    int position = getAdapterPosition();
                    if (position != RecyclerView.NO_POSITION){
                        listener.onItemClick(position);
                    }
                }
            }
        });

        mDeleteImg.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (listener != null){
                    int position = getAdapterPosition();
                    if (position != RecyclerView.NO_POSITION){
                        listener.onDeleteClick(position);
                    }
                }
            }
        });
    }

}

public MyAdapter(ArrayList<listaMat> listaMateri) {
    matArrayList = listaMateri;
}

@NonNull
@Override
public ExampleViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View V = LayoutInflater.from(parent.getContext()).inflate(R.layout.lista_mat, parent, false);
    ExampleViewHolder evh = new ExampleViewHolder(V, mListener);
    return evh;
}

@Override
public void onBindViewHolder(@NonNull ExampleViewHolder holder, int position) {
    listaMat currentItem = matArrayList.get(position);

    holder.mImageview.setImageResource(currentItem.getmImageResource());
    holder.mTextView.setText(currentItem.getmText());
}

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

}

Answer 1

在您使用 recyclerview 的 MainActivity 中使用此代码。你可以找到完整的例子here

mAdapter.setOnItemClickListener(new MyAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(int position) {
                // Do Something
            }

            @Override
            public void onDeleteClick(int position) {
                // Do Something
            }
        });

Answer 2

1. 如果你想在这里使用它

    holder.mImageview.setOnClickListener(v -> {
                Intent intent = new Intent(holder.mImageview.getContext(), MainDownload.class);
                holder.mImageview.getContext().startActivity(intent);
   
            }
   

2. 如果你想在界面中使用它，请这样做

    public class exampler extends AppCompatActivity , MyAdapter.OnItemClickListener {
   

   }

Answer 3

 @Override
public void onBindViewHolder(@NonNull ExampleViewHolder holder, int position) {
    listaMat currentItem = matArrayList.get(position);
    holder.mImageview.setImageResource(currentItem.getmImageResource());
    holder.mTextView.setText(currentItem.getmText());
    holder.mImageview.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (listener != null){
                    int position = getAdapterPosition();
                    if (position != RecyclerView.NO_POSITION){
                        listener.onItemClick(position);
                    }
                }
            }
        });
}