1、布局实现的效果
2、找到该布局文件下的所在的activity，实现的效果
package com.bwie.checkbox_all;
import java.util.ArrayList;
import java.util.Iterator;
import com.bwie.adapter.MyAdapter;
import com.bwie.vo.User;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener {
private Button all;
private Button delete;
private Button reverse;
private TextView sum_price;
private ListView lv;
private String[] name = new String[] { "宋静萌", "范丽清", "杨洋", "郑芳蓓", "张丹",
"刘孟琦", "张聪聪", "任殊慧", "刘黎伟", "巢乐乐", "廉洪波", "朱帅", "李海洋", "黄校丹", "王涛",
"李豆" };
private float[] price = new float[] { 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100, 100 };
private User user;
private ArrayList<User> list_user;
private MyAdapter adapter;
float sum=0;（价格的总价）
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 初始化数据（找控件）
init();
// 为lv设置数据
setDataForLv();
// 为按钮设置点击监听事件
all.setOnClickListener(this);
delete.setOnClickListener(this);
reverse.setOnClickListener(this);
}
private void setDataForLv() {
// 创建集合对象
list_user = new ArrayList<User>();
for (int i = 0; i < name.length; i++) {
user = new User(name[i], price[i], false);
// 将对象添加到集合中
list_user.add(user);
}
// 为listview设置适配器
adapter = new MyAdapter(MainActivity.this, list_user,sum_price);
lv.setAdapter(adapter);
}
private void init() {
// TODO Auto-generated method stub
// 找控件
all = (Button) findViewById(R.id.all);
delete = (Button) findViewById(R.id.delete);
reverse = (Button) findViewById(R.id.reverse);
sum_price = (TextView) findViewById(R.id.sum_price);
lv = (ListView) findViewById(R.id.lv);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.all://全选按钮（将对象中的boolean赋值为true）
sum=0;//每次点击是都现将总价赋值为0，否则会出现累加的效果
// 将复选框设置为true
for (int i = 0; i < list_user.size(); i++) {
list_user.get(i).setIscheck(true);
//计算总价
sum += list_user.get(i).getPrice();
}
//为总价textview赋值
sum_price.setText(sum+"");
// 重新刷新适配器（实现页面重新展示执行后展示最后的界面）
adapter.notifyDataSetChanged();
break;
case R.id.delete:
//迭代遍历集合对象
Iterator<User> iterator = list_user.iterator();
while(iterator.hasNext())
{
User next = iterator.next();//获取每次迭代的对象
boolean ischeck = next.isIscheck();//遍历选中的状态，若是选中的状态，就将选中的 条目删除
if(ischeck)
{
iterator.remove();
}
}
adapter.notifyDataSetChanged();
break;
case R.id.reverse:
//反选
for(int i = 0; i < list_user.size(); i++)
{
//判断复选框的选中状态
boolean ischeck = list_user.get(i).isIscheck();
if(ischeck)
{
//为选中的状态就使其为未选中的状态
list_user.get(i).setIscheck(false);
//计算总价
sum -= list_user.get(i).getPrice();
}else{
//为未选中的状态就使其为选中的状态
list_user.get(i).setIscheck(true);
sum += list_user.get(i).getPrice();
}
}
sum_price.setText(sum+"");
adapter.notifyDataSetChanged();
break;
}
}
}3、对应的适配器的代码
package com.bwie.adapter;
import java.util.ArrayList;import java.util.List;
import com.bwie.checkbox_all.R;import com.bwie.vo.User;
import android.content.Context;import android.content.SharedPreferences;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.CompoundButton.OnCheckedChangeListener;import android.widget.TextView;
public class MyAdapter extends BaseAdapter {
private Context context; private ViewHolder holder; private List<User> list; private float sum; private TextView sum_price; private SharedPreferences share;
public MyAdapter(Context context, List<User> list, TextView sum_price) { this.context = context; this.list = list; this.sum_price = sum_price;
}
@Override public int getCount() { // TODO Auto-generated method stub return list.size(); }
@Override public Object getItem(int position) { // TODO Auto-generated method stub return null; }
@Override public long getItemId(int position) { // TODO Auto-generated method stub return 0; }
@Override public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) { // 填充新布局 convertView = View.inflate(context, R.layout.item_layout, null);
holder = new ViewHolder();
// 找控件 holder.name = (TextView) convertView.findViewById(R.id.name_item); holder.price = (TextView) convertView.findViewById(R.id.price_item); holder.box = (CheckBox) convertView.findViewById(R.id.checkbox);
// 进行绑定 convertView.setTag(holder);
} else { holder = (ViewHolder) convertView.getTag(); }
// 为找到的控件赋值 holder.name.setText(list.get(position).getName()); holder.price.setText(list.get(position).getPrice() + "");
// 滑动时，checkbox状态改变了（convertView复用导致的），就调用这个方法 holder.box.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
list.get(position).setIscheck(isChecked);
sum = 0; for (int i = 0; i < list.size(); i++) { boolean ischeck = list.get(i).isIscheck(); if (ischeck) { float price = list.get(i).getPrice(); sum += price; } }
sum_price.setText(sum + "");
} });
//为复选框赋值必须写在状态变换监听事件的后面（避免错乱） holder.box.setChecked(list.get(position).isIscheck());
return convertView; }
class ViewHolder {
TextView name; TextView price; CheckBox box;
}
}
4、JavaBean类
package com.bwie.vo;
public class User {
private String name;
private float price;
private boolean ischeck;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
public boolean isIscheck() {
return ischeck;
}
public void setIscheck(boolean ischeck) {
this.ischeck = ischeck;
}
@Override
public String toString() {
return "User [name=" + name + ", price=" + price + ", ischeck="
+ ischeck + "]";
}
public User(String name, float price, boolean ischeck) {
super();
this.name = name;
this.price = price;
this.ischeck = ischeck;
}
public User() {
super();
}
}
时间： 2024-08-26 03:22:41