此Demo主要解決的是購物車中的全選，反選計算價格和選中的條目個數的問題，當選中幾條時，點擊反選，會把當先選中的變為不選中，把不選中的變為選中。點擊全選會全部選中，再次點擊時，變為全部不選中。
//-----------一下為main的布局-----------------------
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView android:layout_width="fill_parent"
android:layout_height="40dp"
android:text="已選中個數"
android:id="@+id/tv_num"
android:gravity="center"/>
<LinearLayout android:layout_width="fill_parent"
android:layout_height="40dp"
android:orientation="horizontal"
>
<Button android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="fill_parent"
android:text="全選"
android:gravity="center"
android:id="@+id/bt_quanxuan"/>
<Button android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="fill_parent"
android:text="反選"
android:gravity="center"
android:id="@+id/bt_fanxuan"/>
</LinearLayout>
<ListView android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="@+id/lv"></ListView>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="40dp"
android:orientation="horizontal"
>
<TextView android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="2"
android:text="總價："
android:id="@+id/tv_zongjai"
android:gravity="center"/>
<Button android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="支付"
android:id="@+id/bt_zifu"
android:gravity="center"/>
</LinearLayout>
</LinearLayout>
//-----------------一下為Listview條目的布局--------------------------------
<?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="vertical" >
<LinearLayout android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<CheckBox android:layout_width="60dp"
android:layout_height="wrap_content"
android:gravity="center"
android:id="@+id/cb_checkbox"/>
<TextView android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:id="@+id/tv_title"
android:textSize="20sp"/>
<TextView android:layout_width="100dp"
android:layout_height="wrap_content"
android:id="@+id/tv_money"
android:gravity="center"/>
</LinearLayout>
</LinearLayout>
//------------------一下為bean包中封裝的數據對象-----創建了一個News類-----------------------
package com.bwie.test;
public class News {
private String title;
private String money;
private boolean flag;
public News(String title, String money, boolean flag) {
super();
this.title = title;
this.money = money;
this.flag = flag;
}
public News() {
super();
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getMoney() {
return money;
}
public void setMoney(String money) {
this.money = money;
}
public boolean isFlag() {
return flag;
}
public void setFlag(boolean flag) {
this.flag = flag;
}
@Override
public String toString() {
return "News [title=" + title + ", money=" + money + ", flag=" + flag
+ "]";
}
}
//---------------一下是自定義的適配器-------MyAdapter-------------------------
package com.bwie.test;
import java.util.HashMap;
import java.util.List;
import android.content.Context;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.TextView;
public class MyAdapter extends BaseAdapter{
private List<News> news;
private Context context;
private static HashMap<Integer, Boolean> isSelected;
private onCheckListener listener;
private CheckBox check;
public MyAdapter(List<News> news, Context context) {
super();
this.news = news;
this.context = context;
isSelected = new HashMap<Integer, Boolean>();
for (int i = 0; i < news.size(); i++) {
getIsSelected().put(i, false);
}
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return news.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return news.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) {
ViewHolder holder;
News newss=news.get(position);
if (convertView==null) {
convertView=View.inflate(context, R.layout.list_item, null);
holder=new ViewHolder();
holder.title=(TextView) convertView.findViewById(R.id.tv_title);
holder.money=(TextView) convertView.findViewById(R.id.tv_money);
holder.flag=(CheckBox) convertView.findViewById(R.id.cb_checkbox);
convertView.setTag(holder);
}
holder=(ViewHolder) convertView.getTag();
holder.title.setText(newss.getTitle());
holder.money.setText(newss.getMoney());
holder.flag.setChecked(newss.isFlag());
// 根據isSelected來設置checkbox的選中狀況
holder.flag.setChecked(getIsSelected().get(position));
holder.flag.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO 自動生成的方法存根
if (isSelected.get(position)) {
isSelected.put(position, false);
setIsSelected(isSelected);
} else {
isSelected.put(position, true);
setIsSelected(isSelected);
}
listener.onCheck(isSelected);
}
});
return convertView;
}
static class ViewHolder{
public TextView title;
public TextView money;
public CheckBox flag;
}
public static HashMap<Integer, Boolean> getIsSelected() {
return isSelected;
}
public static void setIsSelected(HashMap<Integer, Boolean> isSelected) {
MyAdapter.isSelected = isSelected;
}
public void setListener(onCheckListener listener) {
this.listener = listener;
}
public interface onCheckListener {
void onCheck(HashMap<Integer, Boolean> map);
}
}
//--------------------------------------
//========================以下是MainActivity==========================================
package com.bwie.test;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.bwie.test.MyAdapter.onCheckListener;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.util.Log;
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 onCheckListener, OnClickListener {
private String urlPath="http://172.17.29.120/localuser/loupengfei/kaoshi/shoppingcar.json";
private List<News> news=new ArrayList<News>();
private ArrayList<Shopbean> list;
private int checkNum = 0; // 記錄選中的條目數量
private float total = 0.00f;
private Button bt_fanxuan;
private Button bt_quanxuan;
private MyAdapter adapter;
private TextView tv_num;
private TextView tv_zongjai;
private ListView lv;
private SharedPreferences sp;
private Handler handler=new Handler(){
public void handleMessage(Message msg) {
switch (msg.what) {
case 0:
//獲得網絡請求的數據
String text=(String) msg.obj;
tojson(text);
break;
default:
break;
}
}
};
//------------------------
private void tojson(String text) {
try {
JSONObject obj=new JSONObject(text);
JSONArray data=obj.getJSONArray("data");
for (int i = 0; i < data.length(); i++) {
JSONObject json=data.getJSONObject(i);
String title=json.getString("title");
String money=json.getString("money");
News newss=new News(title, money, false);
news.add(newss);
}
//設置適配器
adapter = new MyAdapter(news, this);
lv.setAdapter(adapter);
adapter.setListener(this);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
};
//------------------------------
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//創建SharedPreferences
sp = getSharedPreferences("kk", Context.MODE_PRIVATE);
//找到控件
bt_fanxuan = (Button) findViewById(R.id.bt_fanxuan);
bt_quanxuan = (Button) findViewById(R.id.bt_quanxuan);
lv = (ListView) findViewById(R.id.lv);
tv_num = (TextView) findViewById(R.id.tv_num);
tv_zongjai = (TextView) findViewById(R.id.tv_zongjai);
//獲得數據
huodeshuju();
//設置監聽
bt_fanxuan.setOnClickListener(this);
bt_quanxuan.setOnClickListener(this);
}
//------------------------------------
//獲得網絡數據
private void huodeshuju() {
new Thread(){
public void run() {
try {
URL url=new URL(urlPath);
HttpURLConnection urlConnection=(HttpURLConnection) url.openConnection();
urlConnection.setConnectTimeout(5000);
urlConnection.setReadTimeout(5000);
urlConnection.setRequestMethod("GET");
urlConnection.connect();
int code=urlConnection.getResponseCode();
if (code==200) {
InputStream inputStream=urlConnection.getInputStream();
BufferedReader reader=new BufferedReader(new InputStreamReader(inputStream));
String liner;
StringBuffer buffer=new StringBuffer();
while ((liner=reader.readLine())!=null) {
buffer.append(liner);
}
String str=buffer.toString();
Log.i("shuju:", str);
Message message=new Message();
message.what=0;
message.obj=str;
handler.sendMessage(message);
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
};
}.start();
}
@Override
public void onCheck(HashMap<Integer, Boolean> map) {
// TODO 自動生成的方法存根
total = 0.00f;
checkNum = 0;
for (int i = 0; i < map.size(); i++) {
if (map.get(i)) {
total += Float.valueOf(news.get(i).getMoney());
checkNum++;
}
}
//更新顯示數據
dataChanged(total);
}
private void dataChanged(float total2) {
DecimalFormat decimalFormat = new DecimalFormat();// 構造方法的字符格式這里如果小數不足2位,會以0補足.
String price_num = decimalFormat.format(total);// format 返回的是字符串
String str = "合計" + "￥" + price_num + " ";
// 通知listView刷新
adapter.notifyDataSetChanged();
// 用TextView顯示 總價、選中數量
tv_zongjai.setText(str);
tv_num.setText("已選中："+checkNum);
}
//----------監聽-----------------------
@Override
public void onClick(View v) {
switch (v.getId()) {
//全選
case R.id.bt_quanxuan:
//去SharedPreferences中獲得是否為全選狀態，true為全選狀態，false為不是全選狀態
boolean kk=sp.getBoolean("kk", false);
//為全選時，遍歷設置為全不選
if (kk) {
// 遍歷list的長度，設為未選
for (int i = 0; i < news.size(); i++) {
adapter.getIsSelected().put(i, false);
checkNum=0;// 數量減1
total = 0.00f;
}
// 刷新listview和TextView的顯示
dataChanged(total);
//保存狀態為全不選
Editor editor=sp.edit();
editor.putBoolean("kk", false);
editor.commit();
}else{
// 當不是全選時，設置為全選
total = 0.00f;
// 遍歷list的長度，設為已選
checkNum = news.size();
for (int i = 0; i < news.size(); i++) {
adapter.getIsSelected().put(i, true);
total += Float.valueOf(news.get(i).getMoney()) ;
}
// 刷新listview和TextView的顯示
dataChanged(total);
//保存全選狀態
Editor editor=sp.edit();
editor.putBoolean("kk", true);
editor.commit();
}
break;
//反選
case R.id.bt_fanxuan:
checkNum=0;
//獲得全選狀態
boolean kkk=sp.getBoolean("kk", false);
total=0;
//為全選時，設置為全不選
if (kkk) {
// 遍歷list的長度，設為未選
for (int i = 0; i < news.size(); i++) {
adapter.getIsSelected().put(i, false);
checkNum=0;// 數量減1
total = 0.00f;
}
// 刷新listview和TextView的顯示
dataChanged(total);
Editor editor=sp.edit();
editor.putBoolean("kk", false);
editor.commit();
}else{
//不為全選時，也就是有選中的，有沒選中的
// 遍歷list的長度，設為未選
for (int i = 0; i < news.size(); i++) {
//獲得當條目的選中狀態
Boolean n=adapter.getIsSelected().get(i);
//如果選中，設為不選中
if (n) {
adapter.getIsSelected().put(i, false);
//獲得選中條目的布爾值
Boolean a=adapter.getIsSelected().get(i);
//
if (a) {
total+=Float.valueOf(news.get(i).getMoney());
Log.i("總價111：", total+"");
checkNum++;// 數量減1
}
}else{
adapter.getIsSelected().put(i, true);
Boolean a=adapter.getIsSelected().get(i);
if (a) {
total+=Float.valueOf(news.get(i).getMoney());
Log.i("總價222：", total+"");
checkNum++;// 數量減1
}
}
}
// 刷新listview和TextView的顯示
dataChanged(total);
}
break;
default:
break;
}
}
}
//==============以上是MainActivity==================完了，趕快試試吧============