RecyclerView onclick不起作用

Question

我試圖使我單擊並在RecyclerView上添加項目，它將打開包含所單擊項目詳細信息的新活動。

我的adapter.java代碼是：

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

private Context context;
private LayoutInflater inflater;
List<UsersData> data= Collections.emptyList();
UsersData current;
int currentPos=0;

// create constructor to innitilize context and data sent from MainActivity
public AdapterUsersData(Context context, List<UsersData> data){
    this.context=context;
    inflater= LayoutInflater.from(context);
    this.data=data;
}

// Inflate the layout when viewholder created
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view=inflater.inflate(R.layout.container_users, parent,false);
    MyHolder holder=new MyHolder(view);
    return holder;
}

// Bind data
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

    // Get current position of item in recyclerview to bind data and assign values from list
    final MyHolder myHolder= (MyHolder) holder;
    final UsersData current=data.get(position);
    myHolder.textFirstName.setText("First Name: " + current.fname);
    myHolder.textPassword.setText("Pass: " + current.password);
    myHolder.textLastName.setText("Last Name: " + current.lname);
    myHolder.textEmail.setText("Email. " + current.email);


}

// return total item from List
@Override
public int getItemCount() {
    return data.size();
}


class MyHolder extends RecyclerView.ViewHolder{

    TextView textFirstName;
    TextView textPassword;
    TextView textLastName;
    TextView textEmail;

    // create constructor to get widget reference
    public MyHolder(View itemView) {
        super(itemView);
        textFirstName= (TextView) itemView.findViewById(R.id.textFirstName);
        textPassword = (TextView) itemView.findViewById(R.id.textPassword);
        textLastName = (TextView) itemView.findViewById(R.id.textLastName);
        textEmail = (TextView) itemView.findViewById(R.id.textEmail);
    }

}

}

例如，我想將“ curremt.fname .......”解析為另一個活動，以向用戶顯示所單擊項目的完整詳細信息。

Answer 1

RecyclerViews開箱即用地提供了onclick功能。 您需要自己提供onClick功能。 長按也是如此。

理想情況下，您將使ViewHolder實現View.OnClickListener接口，並在ViewHolder的構造函數內部將其注冊為itemView的單擊偵聽器。 每當調用onClick方法時，您都可以通過調用getAdapterPostion（）獲取該ViewHolder實例的位置。 這將返回一個int，該int指示View相對於Adapters數據集的位置。 從這里可以調用regisster自定義回調。 我在應用程序中所做的就是創建一個自定義onItemClick界面，該界面具有觸發方法並接收int的位置和被單擊的視圖。 我已經修改了您的代碼，以舉例說明您可以做什么。

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

private Context context;
private LayoutInflater inflater;
List<UsersData> data= Collections.emptyList();
UsersData current;
int currentPos=0;

// create constructor to innitilize context and data sent from MainActivity
public AdapterUsersData(Context context, List<UsersData> data){
    this.context=context;
    inflater= LayoutInflater.from(context);
    this.data=data;
}

// Inflate the layout when viewholder created
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view=inflater.inflate(R.layout.container_users, parent,false);
    MyHolder holder=new MyHolder(view);
    return holder;
}

// Bind data
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

    // Get current position of item in recyclerview to bind data and assign values from list
    final MyHolder myHolder= (MyHolder) holder;
    final UsersData current=data.get(position);
    myHolder.textFirstName.setText("First Name: " + current.fname);
    myHolder.textPassword.setText("Pass: " + current.password);
    myHolder.textLastName.setText("Last Name: " + current.lname);
    myHolder.textEmail.setText("Email. " + current.email);


}

// return total item from List
@Override
public int getItemCount() {
    return data.size();
}

public interface OnItemClickListener {
    void onItemClicked(View v, int position);
}

private OnItemClickListener listener;


class MyHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

    TextView textFirstName;
    TextView textPassword;
    TextView textLastName;
    TextView textEmail;

    // create constructor to get widget reference
    public MyHolder(View itemView) {
        super(itemView);
        itemView.setOnClickListener(this);
        textFirstName= (TextView) itemView.findViewById(R.id.textFirstName);
        textPassword = (TextView) itemView.findViewById(R.id.textPassword);
        textLastName = (TextView) itemView.findViewById(R.id.textLastName);
        textEmail = (TextView) itemView.findViewById(R.id.textEmail);
    }

    public void onClick(View v) {
        if(listener != null) {
            listener.onItemClicked(v, getAdapterPosition());
        }
    }

}

Answer 2

你可以試試..

class dapterUsersData extends RecyclerView.Adapter<dapterUsersData.ViewHolder> {

    private Context context;
    private LayoutInflater inflater;
    List<UsersData> data =  Collections.emptyList();
    ArrayList<UsersData> dataSet;

    public dapterUsersData(ArrayList<UsersData> data) {
        this.data = data;
    }


    @Override
    public dapterUsersData.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {

        View itemLayoutView = LayoutInflater.from(viewGroup.getContext()).inflate(
                R.layout.container_users, null);
        itemLayoutView.setLayoutParams(new RecyclerView.LayoutParams(RecyclerView.LayoutParams.MATCH_PARENT, RecyclerView.LayoutParams.WRAP_CONTENT));


        dapterUsersData.ViewHolder viewHolder = new dapterUsersData.ViewHolder(itemLayoutView);

        return viewHolder;
    }

    @Override
    public void onBindViewHolder(dapterUsersData.ViewHolder viewHolder, int i) {

        UsersData current = data.get(i);

        viewHolder.textFirstName.setText("First Name: " + current.getFname());
        viewHolder.textPassword.setText("Pass: " + current.getPassword());
        viewHolder.textLastName.setText("Last Name: " + current.getLname());
        viewHolder.textEmail.setText("Email. " + current.getEmail());

        viewHolder.menu = current;
    }

    @Override
    public int getItemCount() {

        return dataSet.size();
    }

    public void updateList(List<UsersData> temp) {
        dataSet = (ArrayList<UsersData>) temp;
        notifyDataSetChanged();
    }

    // inner class to hold a reference to each item of RecyclerView
    public  class ViewHolder extends RecyclerView.ViewHolder {

        TextView textFirstName;
        TextView textPassword;
        TextView textLastName;
        TextView textEmail;




        public UsersData menu;

        public ViewHolder(View itemLayoutView) {
            super(itemLayoutView);

            textFirstName= (TextView) itemLayoutView.findViewById(R.id.textFirstName);
            textPassword = (TextView) itemLayoutView.findViewById(R.id.textPassword);
            textLastName = (TextView) itemLayoutView.findViewById(R.id.textLastName);
            textEmail = (TextView) itemLayoutView.findViewById(R.id.textEmail);


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

                    //  OnClick
                    String firstName = textFirstName.getText().toString();

                }
            });

        }

    }
}
//end Adapter

Answer 3

謝謝你們的幫助！

無論如何，我剛剛添加了：

 myHolder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(context,current.fname.toString(),Toast.LENGTH_LONG).show();
        }
    });

到：public void onBindViewHolder（RecyclerView.ViewHolder持有人，int位置）方法，它起作用了。