MianActivity的布局文件
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.szg.lianxi.MainActivity"> <TextView android:id="@+id/tv_sum_PRice" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/bt1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="全选" /> <Button android:id="@+id/bt2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="反选" /> <Button android:id="@+id/bt3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="全不选" /> <Button android:id="@+id/bt4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="结算" /> </LinearLayout> <ListView android:id="@+id/listview" android:layout_width="wrap_content" android:layout_height="wrap_content"></ListView></LinearLayout>ListView的子布局<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/tv_item_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_weight="1"/> <TextView android:id="@+id/tv_item_price" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_weight="1"/> <CheckBox android:id="@+id/cb_item" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" /></RelativeLayout>bean包的属性把属性定义有参构造package com.szg.lianxi;public class cargo { private String name; private String picPath; private int price; public int getPrice() { return price; } public void setPrice(int price) { this.price = price; } public cargo(String name, int price, String picPath, boolean flag) { this.name = name; this.price = price; this.picPath = picPath; this.flag = flag; } private boolean flag; public cargo(String name, String picPath, boolean flag) { this.name = name; this.picPath = picPath; this.flag = flag; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPicPath() { return picPath; } public void setPicPath(String picPath) { this.picPath = picPath; } public boolean isFlag() { return flag; } public void setFlag(boolean flag) { this.flag = flag; }}适配器中的代码package com.szg.lianxi;import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.TextView;import android.widget.Toast;import java.util.ArrayList;public class CargoAdapter extends BaseAdapter { private final Context context; private final ArrayList<cargo> cargoArrayList; CargoAdapter(Context context, ArrayList<cargo> cargoArrayList) { this.context = context; this.cargoArrayList = cargoArrayList; } @Override public int getCount() { return cargoArrayList.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(final int position, View convertView, ViewGroup parent) { final ViewHolder holder; if (convertView == null) { holder = new ViewHolder(); //找到布局 convertView = View.inflate(context, R.layout.lv_item, null); holder.cb_item = (CheckBox) convertView.findViewById(R.id.cb_item); holder.tv_item = (TextView) convertView.findViewById(R.id.tv_item_name); holder.tv_price = (TextView) convertView.findViewById(R.id.tv_item_price); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.tv_item.setText(cargoArrayList.get(position).getName()); holder.cb_item.setChecked(cargoArrayList.get(position).isFlag()); holder.tv_price.setText(cargoArrayList.get(position).getPrice()+"");// holder.cb_item.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {// @Override// public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {// Toast.makeText(context,"改变了"+position,Toast.LENGTH_SHORT).show();// }// }); //给CheckBox设置点击事件 holder.cb_item.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //改变bean包中flag if(holder.cb_item.isChecked()){ cargoArrayList.get(position).setFlag(true); }else{ cargoArrayList.get(position).setFlag(false); } //触发价格改变 MainActivity mainActivity = (MainActivity) CargoAdapter.this.context; mainActivity.setMoney(); } }); return convertView; } class ViewHolder { TextView tv_item; TextView tv_price; CheckBox cb_item; }}MianActivity中的代码package com.szg.lianxi;import android.content.DialogInterface;import android.support.v7.app.AlertDialog;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import java.util.ArrayList;public class MainActivity extends AppCompatActivity implements View.OnClickListener { private ListView listview; private CargoAdapter cargoAdapter; private TextView tv_sum_price; int sum=0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); listview=(ListView) findViewById(R.id.listview); findViewById(R.id.bt1).setOnClickListener(this); findViewById(R.id.bt2).setOnClickListener(this); findViewById(R.id.bt3).setOnClickListener(this); findViewById(R.id.bt4).setOnClickListener(this); tv_sum_price=(TextView) findViewById(R.id.tv_sum_price); initData(); cargoAdapter=new CargoAdapter(this,caragolist); //设置适配器 listview.setAdapter(cargoAdapter); } ArrayList<cargo> caragolist=new ArrayList<>(); private void initData() { for (int i=0;i<50;i++){ caragolist.add( new cargo("商品"+i,i+1,null,false)); } } @Override public void onClick(View v) { switch (v.getId()){ //全选 case R.id.bt1: //遍历集合改变点击的状态 for (int i=0;i<caragolist.size();i++){ caragolist.get(i).setFlag(true);// sum=sum+caragolist.get(i).getPrice(); setMoney(); } //刷新适配器 cargoAdapter.notifyDataSetChanged(); break; //反选 case R.id.bt2: for (int i=0;i<caragolist.size();i++){ //将之前的状态取出，改编成相反状态 caragolist.get(i).setFlag(!caragolist.get(i).isFlag());// sum=sum+caragolist.get(i).getPrice(); setMoney(); } //刷新适配器 cargoAdapter.notifyDataSetChanged(); break; //全不选 case R.id.bt3: //遍历集合改变点击的状态 for (int i=0;i<caragolist.size();i++){ caragolist.get(i).setFlag(false);// sum=sum+caragolist.get(i).getPrice(); setMoney(); } //刷新适配器 cargoAdapter.notifyDataSetChanged(); break; //结算 case R.id.bt4:// int sum=0;// for (int i=0;i<caragolist.size();i++){// if ((caragolist.get(i).isFlag())){// sum=sum+caragolist.get(i).getPrice();// }// } showNormalDia();// Toast.makeText(this,sum+"",Toast.LENGTH_LONG).show(); break; } } public void setMoney() { int sum=0; for (int i=0;i<caragolist.size();i++){ if ((caragolist.get(i).isFlag())){ sum=sum+caragolist.get(i).getPrice(); } } tv_sum_price.setText("总价格"+sum); } /*普通的对话框*/ private void showNormalDia() { //AlertDialog.Builder normalDialog=new AlertDialog.Builder(getapplicationContext()); final AlertDialog.Builder normalDia=new AlertDialog.Builder(MainActivity.this); for (int i=0;i<caragolist.size();i++){ if ((caragolist.get(i).isFlag())){ sum=sum+caragolist.get(i).getPrice(); } } normalDia.setIcon(R.mipmap.ic_launcher); normalDia.setTitle("结算"); normalDia.setMessage("价格:"+sum); normalDia.setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub// showClickMessage("确定");// setMoney();// for (int i=0;i<caragolist.size();i++){// if ((caragolist.get(i).isFlag())){// sum=sum+caragolist.get(i).getPrice();// }// } Toast.makeText(MainActivity.this,sum+"",Toast.LENGTH_LONG).show(); } }); normalDia.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub// showClickMessage("取消"); } }); normalDia.create().show(); }}
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