购物车中的全选or单选操作

来源：互联网发布：梅西c罗生涯数据对比编辑：程序博客网时间：2024/06/05 00:57

listview的item布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

<CheckBox
     android:id="@+id/ck"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     />
<TextView
     android:id="@+id/tv"
     android:textSize="18sp"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     />
</LinearLayout>

主界面布局

</RelativeLayout>

主类

package com.example.allandreverse;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

private ListView list_view;
private CheckAdapter checkAdapter;
private CheckBox allBox;
private Button reverse;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  list_view = (ListView)findViewById(R.id.list_view);
  allBox = (CheckBox)findViewById(R.id.all);
  reverse = (Button)findViewById(R.id.reverse);

  List<String> list = new ArrayList<String>();
  for (int i = 0; i < 15; i++) {
   list.add("这是条目" + i);
  }

  checkAdapter = new CheckAdapter(getApplicationContext(), list);
  list_view.setAdapter(checkAdapter);

  //设置全选
  allBox.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    boolean flag = allBox.isChecked();

    for (int i = 0; i < checkAdapter.getSelect().size(); i++) {
     checkAdapter.getSelect().set(i, flag);
    }
    checkAdapter.notifyDataSetChanged();

   }
  });

  //反选
  reverse.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    if (! checkAdapter.getSelect().contains(true)) {
     Toast.makeText(MainActivity.this, "qingxuanz", 0).show();
    }else {
     for (int i = 0; i < checkAdapter.getSelect().size(); i++) {
      if (checkAdapter.getSelect().get(i)) {
       checkAdapter.getSelect().set(i, false);
      }else {
       checkAdapter.getSelect().set(i, true);
      }
     }

     if (checkAdapter.getSelect().contains(false)) {
      allBox.setChecked(false);
     }

     checkAdapter.notifyDataSetChanged();
    }
   }
  });

}

private class CheckAdapter extends BaseAdapter {
  private List<String> list;
  private Context context;

  //创建一个集合去记录选中与未选中的状态
  LinkedList<Boolean> linkedList = new LinkedList<Boolean>();

  public CheckAdapter(Context context, List<String> list) {
   // TODO Auto-generated constructor stub
   this.list = list;
   this.context = context;

   for (int i = 0; i < list.size(); i++) {
    linkedList.add(false);
   }

  }
  //对外提供一个方法获取这个集合
  private List<Boolean> getSelect() {
   return linkedList;
  }

  @Override
  public int getCount() {
   // TODO Auto-generated method stub
   return list.size();
  }

  @Override
  public Object getItem(int position) {
   // TODO Auto-generated method stub
   return list.get(position);
  }

  @Override
  public long getItemId(int position) {
   // TODO Auto-generated method stub
   return position;
  }

  @Override
  public View getView(final int position, View convertView,
    ViewGroup parent) {
   if (convertView == null) {
    convertView = View.inflate(context, R.layout.item, null);
   }
   CheckBox ck = (CheckBox) convertView.findViewById(R.id.ck);
   TextView tView = (TextView) convertView.findViewById(R.id.tv);

tView.setText(list.get(position));

   ck.setChecked(linkedList.get(position));
   //对checkBox点击进行监听
   ck.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
     //点中的时候改成相反的值
     linkedList.set(position, ! linkedList.get(position));

     //点击的同时还要去判断全选
     if (linkedList.contains(false)) {
      allBox.setChecked(false);
     }else {
      allBox.setChecked(true);
     }

     notifyDataSetChanged();
    }
   });

   return convertView;
  }

}

适配器

0 0