如何在 toast 中显示包含字符串数据的选定行？ [关闭]

Question

字符串位于字符串数组中，我称之为字符串并设置值，如

    nameCollection = getActivity().getResources().getStringArray(R.array.boy);

for (int i = 0; i < nameCollection.length; i++) {
names.add(new Name(nameCollection[i]));   //It will display all in the list

}

现在，如果我按下任何一行，则应该显示来自字符串数组的文本。例如，

cv.setOnClickListener(new OnClick....  {
 Toast.makeText(getApplicationContext(),"Need to display selected string row data",Toast.LENGTH_SHORT).show();
});

例如列表是这样的

APPLE
BALL
CAT
DOG

现在，如果我按 CAT，然后将 toast 显示为“CAT” 我使用的是 RecyclerView 而不是 listview。谢谢！！ ;)

Answer 1

为 RecyclerView 实现更不紧密耦合的 OnClickListener 的更好方法是......

用法片段：

RecyclerView recyclerView = findViewById(R.id.recycler);
recyclerView.addOnItemTouchListener(
    new RecyclerItemClickListener(context, recyclerView ,new RecyclerItemClickListener.OnItemClickListener() {
      @Override public void onItemClick(View view, int position) {
        // do whatever
      }

      @Override public void onLongItemClick(View view, int position) {
        // do whatever
      }
    })
);

RecyclerItemClickListener 实现：

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;


public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener {
  private OnItemClickListener mListener;

  public interface OnItemClickListener {
    public void onItemClick(View view, int position);

    public void onLongItemClick(View view, int position);
  }

  GestureDetector mGestureDetector;

  public RecyclerItemClickListener(Context context, final RecyclerView recyclerView, OnItemClickListener listener) {
    mListener = listener;
    mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
        @Override
        public boolean onSingleTapUp(MotionEvent e) {
            return true;
        }

        @Override
        public void onLongPress(MotionEvent e) {
            View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
            if (child != null && mListener != null) {
                mListener.onLongItemClick(child, recyclerView.getChildAdapterPosition(child));
            }
        }
    });
}

  @Override public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
    View childView = view.findChildViewUnder(e.getX(), e.getY());
    if (childView != null && mListener != null && mGestureDetector.onTouchEvent(e)) {
      mListener.onItemClick(childView, view.getChildAdapterPosition(childView));
      return true;
    }
    return false;
  }

  @Override public void onTouchEvent(RecyclerView view, MotionEvent motionEvent) { }

  @Override
  public void onRequestDisallowInterceptTouchEvent (boolean disallowIntercept){}
}

Answer 2

在 RecyclerView 的 onBindViewHolder() 中使用以下代码。

holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(mContext, "Click:" + names.get(position), Toast.LENGTH_SHORT).show();
            }
        });

Answer 3

ListView 有OnItemClickListner。如果您使用此列表器，您将获得行位置作为参数。使用此位置您可以访问字符串数组中的数据。

listView.setOnItemClickListener(new OnItemClickListener()
{
    @Override 
    public void onItemClick(AdapterView<?> arg0, View arg1,int position, long arg3)
    { 
        Toast.makeText(getApplicationContext(),names.get(position).getName()+"", Toast.LENGTH_SHORT).show();
    }
});