如何将OnClickListner添加到CardView? [英] How to add OnClickListner to CardView?

问题描述

我正在使用RecyclerView和CardView.我想将OnClickListner附加到每张卡上.我尝试了许多关于stackoverflow的答案，但是它们对我不起作用.到目前为止，我已经尝试过-

I am working with RecyclerView and CardView. I want to attach OnClickListner to each card. I tried with many answers available on stackoverflow, but they are not working for me. So far I have tried -

public class SubjectAdapter extends RecyclerView.Adapter<SubjectAdapter.ViewHolder> implements View.OnClickListener,
    View.OnLongClickListener{

private static final String LOGCAT = "SubjectAdapter";
private final Context mContext;

List<Subject> SubjectsList;

public SubjectAdapter(Context context) {
    super();
    this.mContext = context;
    SQLiteDatabase.loadLibs(mContext);
    DBHelper myDbHelper = new DBHelper(mContext);
    SubjectsList = new ArrayList<Subject>();
    SubjectsList = myDbHelper.getAllSubjects();
    myDbHelper.close();
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    View v = LayoutInflater.from(viewGroup.getContext())
            .inflate(R.layout.subject_cardview_row, viewGroup, false);
    ViewHolder viewHolder = new ViewHolder(v);

    // Below two lines are NOT working
    viewHolder.tvSubjectName.setOnClickListener(this);
    //viewHolder.setOnClickListener(this);

    return viewHolder;
}

@Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
    Subject subject = SubjectsList.get(i);
    viewHolder.tvSubjectName.setText(subject.getSubject_Name());
    viewHolder.tvCounts.setText(String.valueOf(subject.getSubject_Number_of_Questions()));

    // Below two lines are NOT working
    viewHolder.tvSubjectName.setOnClickListener(this);
    //viewHolder.setOnClickListener(this);
}

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

@Override
public void onClick(View v) {
    // It's not working either
    ViewHolder holder = (ViewHolder) v.getTag();
    int position = holder.getPosition();

    if (v.getId() == holder.tvSubjectName.getId()){
        Log.d(LOGCAT, "tvSubjectName onClick at" + position);
        //Toast.makeText(mContext, "tvSubjectName onClick at" + position, Toast.LENGTH_LONG).show();
    } else {
        Log.d(LOGCAT, "RecyclerView Item onClick at " + position);
        //Toast.makeText(mContext, "RecyclerView Item onClick at " + position, Toast.LENGTH_LONG).show();
    }
}

@Override
public boolean onLongClick(View v) {
    return false;
}

class ViewHolder extends RecyclerView.ViewHolder {

    public TextView tvSubjectName;
    public TextView tvCounts;

    public ViewHolder(View itemView) {
        super(itemView);
        tvSubjectName = (TextView) itemView.findViewById(R.id.tv_subject_name);
        tvCounts = (TextView) itemView.findViewById(R.id.tv_text_counts);
    }
}
}

正如人们所看到的，我尝试将setOnClickListener与onCreateViewHolder和onBindViewHolder同时用作单独的onClick，但是它们似乎都不对我有用.因此，我想知道，如何将OnClickListner添加到CardView?

As one can see, I have tried setOnClickListener with both onCreateViewHolder and onBindViewHolder, also as separate onClick, but none of them seems to be working for me. So, I want to know, How to add OnClickListner to CardView?

推荐答案

onClick返回的视图不一定与回收者视图的视图"行层次结构相对应. 我认为您应该用

View returned by onClick does not necessarily correspond to View row hierarchy of the recycler view. I think you should modify onBindViewHolder with

@Override
public void onBindViewHolder(final ViewHolder viewHolder, final int i) {
   final Subject subject = SubjectsList.get(i); 
   viewHolder.tvSubjectName.setOnClickListener(new View.OnClickListener(){


    @Override
    public void onClick(View v) {
        Log.d(LOGCAT, "tvSubjectName onClick at" + i);
       // etc
    }

   });
...
}

如果使用长按，则将View.OnClickListener替换为View.OnLongClickListener，将onClick替换为onLongClick.

If you use long click then replace View.OnClickListener with View.OnLongClickListener and onClick with onLongClick.

这篇关于如何将OnClickListner添加到CardView?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！