Question

我正在使用#include和RecyclerView。我想将CardView附加到每张卡片上。我尝试了stackoverflow上提供的许多答案，但它们对我不起作用。到目前为止，我已经尝试过 -

OnClickListner

正如我们所看到的，我已经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); } } }同时使用了setOnClickListener和onCreateViewHolder，也作为单独的onBindViewHolder，但它们似乎都不适合我。所以，我想知道，如何将OnClickListner添加到CardView？

Answer 1

onClick返回的视图不一定对应于回收器视图的View行层次结构。我认为您应该使用

修改onBindViewHolder

@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
    }

   });
...
}

如果您使用长按，则将View.OnClickListener替换为View.OnLongClickListener，将onClick替换为onLongClick。

Answer 2

这对我有用！将 setOnClickListener-method 放在ViewHolder类的构造函数中。

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);

        itemView.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                 //write here the code for wathever you want to do with a card
                 //...
            }
        });

}

}

Answer 3

查看Lucas Rocha的新TwoWayView API。

TwoWayLayoutManager是一个位于LayoutManager之上的简单API，可以为您完成所有繁重的工作，因此您可以专注于如何测量，放置和分离子视图。

Follow his site并且API的实现相对简单，可以帮助您解决RecyclerView和CardView带来的一些复杂困难。

http://lucasr.org/2014/07/31/the-new-twowayview/

Answer 4

在RecyclerView.ViewHolder构造函数中将OnClickListener设置为itemView，您也可以使用getAdapterPosition()方法获取cardView的位置，这可以帮助您使用putExtra intent方法将数据传递给新活动。 doc for getAdapterPosition method

`

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);

        itemView.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                 int position = getAdapterPosition();
                 // use position to put extra data
            }
        });
}

`

Answer 5

如果您真的想要实现onclick侦听器，请执行以下操作

在ViewHolderClass中添加一个View对象，并将其初始化为构造函数中收到的itemView

2.setOnClickListener到您在Adapter类中声明的视图对象（在ViewHolder中）onBindViewHolder

这适用于整个cardView

如何将OnClickListner添加到CardView？

5 个答案: