android - 使用RecyclerView.Adapter在onBindViewHolder()内设置onItemClickListener

我有一个自定义对象:

学生类

public class Student {
  private String name;
  private String age;

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public String getAge() {
    return age;
  }

  public void setAge(String age) {
    this.age = age;
  }
}

然后我实现RecyclerView.Adapter这样的:

MyAdapter.class

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

  private Context context;
  private ArrayList<Student> students = new ArrayList<>();

  public MyAdapter(Context mContext, ArrayList<Student> mStudents) {
    this.context = mContext;
    this.students = mStudents;
  }

  @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(context).inflate(R.layout.item_row, parent, false);
    return new ViewHolder(v);
  }

  @Override public void onBindViewHolder(ViewHolder holder, int position) {

    final Student student = students.get(position);

    holder.name.setText(student.getName());
    holder.age.setText(student.getAge());

    holder.setClickListener(new ItemClickListener() {
      @Override public void onClickItem(int pos) {
        Toast.makeText(context, "CLICK : " + student.getName(), Toast.LENGTH_SHORT).show();
      }

      @Override public void onLongClickItem(int pos) {
        Toast.makeText(context, "LONG CLICK : " + student.getName(), Toast.LENGTH_SHORT).show();
      }
    });
  }

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

  public static class ViewHolder extends RecyclerView.ViewHolder
      implements View.OnClickListener, View.OnLongClickListener {

    private TextView name;
    private TextView age;
    private ItemClickListener mListener;

    public ViewHolder(View itemView) {

      super(itemView);
      name = (TextView) itemView.findViewById(R.id.tv_name);
      age = (TextView) itemView.findViewById(R.id.tv_age);

      itemView.setOnClickListener(this);
      itemView.setOnLongClickListener(this);
    }

    public void setClickListener(ItemClickListener listener) {
      this.mListener = listener;
    }

    @Override public void onClick(View view) {
      mListener.onClickItem(getLayoutPosition());
    }

    @Override public boolean onLongClick(View view) {
      mListener.onLongClickItem(getLayoutPosition());
      return true;
    }
  }

  public interface ItemClickListener {
    void onClickItem(int pos);

    void onLongClickItem(int pos);
  }
}

正如您在onBindViewHolder()中看到的那样，我为holder设置了onItemClickListener()。

@Override public void onBindViewHolder(ViewHolder holder, int position) {

    final Student student = students.get(position);
    holder.name.setText(student.getName());
    holder.age.setText(student.getAge());

    holder.setClickListener(new ItemClickListener() {
      @Override public void onClickItem(int pos) {
        Toast.makeText(context, "CLICK : " + student.getName(), Toast.LENGTH_SHORT).show();
      }

      @Override public void onLongClickItem(int pos) {
        Toast.makeText(context, "LONG CLICK : " + student.getName(), Toast.LENGTH_SHORT).show();
      }
    });
  }

但是我知道，每次有新项目滚动到 View 中时，就会调用onBindViewHolder()方法。因此，在onBindViewHolder()中调用点击监听器会导致其中的昂贵操作。

我该如何解决这个问题？

最佳答案

您需要在onClickListener()的 View 上设置ViewHolder，即您的情况下的itemView。单击完整 View (即根 View )(在您的情况下为itemView)后，它将立即调用onClick()方法

您还可以在根的子级(即名称和年龄)上设置onClickListener()。

ViewHolder(View itemView)构造函数中的:

itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(mContext,"clicked="+ getPosition(),Toast.LENGTH_SHORT).show();

                }
            });

同样，您也可以调用onLongClickListner()。
还有 subview 上的name.setOnClickLisner()。