java - 在自定义 ListView Android 中点击更改图像

Question

在我的自定义 ListView 中，我想在单击图像时更改图像。 但目前，当我单击图像时，最后一行图像发生变化，而不是我单击的图像。 我的自定义适配器类如下:

package com.zek.androidvoicechanger;

import java.util.List;

import org.w3c.dom.Text;

import android.app.Activity;
import android.content.Context;
import android.media.Image;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;

public class CustomAdapter extends ArrayAdapter<Items> {

    Context context;
    ImageView image ;


//  int[] Radio = { R.drawable.play, R.drawable.pause };

    public CustomAdapter(Context context, int resourceId, List<Items> items) {
        super(context, resourceId, items);
        this.context = context;
    }

    private class ViewHolder {
        // ImageView imageView;

        TextView txtTitle;
//      ImageView img;

    }

    public View getView(final int position, View convertView,
            final ViewGroup parent) {

        ViewHolder holder = null;

        Items rowItem = getItem(position);

        LayoutInflater mInflater = (LayoutInflater) context
                .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);

        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.custom_list, null);
            holder = new ViewHolder();

            holder.txtTitle = (TextView) convertView
                    .findViewById(R.id.textView1);
//          holder.img = (ImageView) convertView.findViewById(R.id.imageView2);
            image = (ImageView) convertView.findViewById(R.id.imageView2);
        //  holder.rdo = (RadioButton) convertView.findViewById(R.id.radioButton1);
            convertView.setTag(holder);
        } else
            holder = (ViewHolder) convertView.getTag();

        holder.txtTitle.setText(rowItem.getTitle());

        image.setImageResource(rowItem.getImageId());
        image.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(context, "image clicked", 1000).show();
                if(position==0){
                image.setImageResource(R.drawable.pause);
                }
                AudioListner.playRecord(position);

            }
        });



    //holder.rdo.setTag(position);
//      holder.rdo.setOnCheckedChangeListener(new OnCheckedChangeListener() {
//          
//          @Override
//          public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
//
//          
//              
//          }
//      });

//      rdo.setOnClickListener(new OnClickListener() {
//
//          @Override
//          public void onClick(View v) {
//
//              
//              if(position==0){
//                  rdo.indexOfChild(findViewById(isEnabled(position)));
//                  Toast.makeText(context, "image clicked", 1000).show();
//                  rdo.setBackgroundResource(R.drawable.pause);
//                  AudioListner.playRecord(position);
//                  
//              }
//              
//              
//              
//              if (rdo.isClickable()) {
//                  rdo.setBackgroundResource(R.drawable.pause);
//                  Toast.makeText(context, "image clicked", 1000).show();
//
//                  //Radio[1] = 1;
//                  AudioListner.playRecord(position);
//                  
//              } else {
//              //  rdo.setBackgroundResource(R.drawable.play);
//                  Toast.makeText(context, "image not clicked", 1000).show();
//
//              }
////
//          }
//      });

        return convertView;
    }

}

任何帮助将不胜感激。

Answer 1

基于适配器的 View (例如ListView)会回收其 View 以节省资源。在滚动期间，ListView 将回收不再可见的 View 。 Lucas 的这篇文章是了解更多有关其工作原理的好地方:http://lucasr.org/2012/04/05/performance-tips-for-androids-listview/

因此，在 getView() 方法中注册 onClick 可能不是一个好主意。而是使用 setOnItemClickListener() ListView 上的方法。

要完成您想要做的事情，您可以这样做:

编辑:根据您的评论更新了我的代码。

mYourListView..setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick (AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(context, "Item #" + position + " clicked", Toast.LENGTH_SHORT).show();

            // here, "position" is the position of your item and "id" is your
            // item's id in your data set.

            // mLastClickedPosition is a member field of type long which 
            // stores the position of the most recently clicked item, 
            // initially set to -1
            if(mLastClickedPosition != -1){
                  // do something to pause the item in your list at this position
            }

            // next, update mLastClickedPosition
            mLastClickedPosition = position

            // find the image in your view and update it
            if(position==0){
                  ImageView imageView = view.findViewById(R.id.your_image);
                  imageView.setImageResource(R.drawable.pause);
            }

            // play audio
            AudioListner.playRecord(position);

        }
    });