【实例简介】

【实例截图】

【核心代码】

package food.test.zqz;

import java.math.BigDecimal;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.Context;

import android.content.DialogInterface;

import android.content.Intent;

import android.content.DialogInterface.OnClickListener;

import android.os.Bundle;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.BaseAdapter;

import android.widget.EditText;

import android.widget.GridView;

import android.widget.ImageView;

import android.widget.TextView;

import android.widget.Toast;

import android.widget.AdapterView.OnItemClickListener;

import food.test.R;

import food.test.domain.Food;

import food.test.util.DButil;

import food.test.wjf.ShopCart;

import food.test.wjf.ShopCartShowAll;

import food.test.zqz.util.GetNetWorkData;

public class ActivityShowFoodByType extends Activity {

// 用于存储需要显示的数据

private ArrayList> data = new ArrayList>();

// 用于接收服务端

private ArrayList serverFoods = new ArrayList();

private GridView gv = null;

public final static int SHOW_FOOD_DETAIL = 0;

public final static int CONFIRM_PURCHASE = 1;

public final static int LOOK_UP_SHOPPING = 2;

private DButil db;

// 用户在界面上选中的所有商品信息

public Food selectedFood = new Food();

/**

* 根据菜品类型，获取服务器端的菜品信息

*

* @return

*/

private ArrayList getServerFoodInfoByType(int flagType) {

serverFoods.clear();

HashMap request = new HashMap();

// 获得服务端数据"根据约定的字符串格式"

String resData = GetNetWorkData.getConnectionPost(

GetNetWorkData.URL_AllFood, request).toString();

// String resData =

// "[foodName=test;foodType=0;foodPrice=33.3f;foodImage=500008.jpg],[foodPrice=44;foodType=0;foodName=红烧肉;foodImage=500022.jpg]";

ArrayList serverAllFoods = GetNetWorkData

.decodeResponseData(resData);

Food oneFood;

Iterator it = serverAllFoods.iterator();

while (it.hasNext()) {

oneFood = it.next();

if (oneFood.foodType == flagType) {

serverFoods.add(oneFood);

}

}

return serverFoods;

}// end of getServerData()

/**

* 准备显示在界面的数据

*/

private void prepareView() {

data.clear();

// 获取要显示菜品的类型

Intent intent = this.getIntent();

int showType = intent.getFlags();

// 获取指定类型的菜品

ArrayList assignedFoods = getServerFoodInfoByType(showType);

// 设定界面显示数据

HashMap item;

for (Food food : assignedFoods) {

item = new HashMap();

item.put("price", "价格:" food.foodPrice);

item.put("name", "菜名:" food.foodName);

item.put("icon", food.foodImage);

data.add(item);

}

}// end of prepareView()

public void onCreate(Bundle saved) {

super.onCreate(saved);

setContentView(R.layout.show);

try {

gv = (GridView) this.findViewById(R.id.grid);

prepareView();

MyGridViewAdapter mgva = new MyGridViewAdapter(this);

gv.setAdapter(mgva);

// 监听GridView点击事件

gv.setOnItemClickListener(new OnItemClickListener() {

public void onItemClick(AdapterView> parent, View view,

int position, long id) {

selectedFood = serverFoods.get(position);

setTitle("测试选中事件---" selectedFood.foodId);

Log.e("----test selected---", "" selectedFood.foodId);

ActivityShowFoodByType.this.openOptionsMenu();

Log.e("test GridView onClickListener", "------");

}

});

} catch (Exception e) {

e.printStackTrace();

}

}

protected void onRestart() {

super.onRestart();

Log.e("TabIntent------", "test--onRestart()" getIntent().getFlags());

}

protected void onResume() {

super.onResume();

prepareView();

Log.e("TabIntent------", "test--onResume()" getIntent().getFlags());

}

protected void onStart() {

super.onStart();

Log.e("TabIntent------", "test--onStart()" getIntent().getFlags());

}

protected void onStop() {

super.onStop();

Log.e("TabIntent------", "test--onStop()" getIntent().getFlags());

}

protected void onPause() {

super.onPause();

Log.e("TabIntent------", "test--onPause()" getIntent().getFlags());

}

/**

* 添加功能Menu键

*/

public boolean onCreateOptionsMenu(Menu menu) {

super.onCreateOptionsMenu(menu);

menu.add(1, SHOW_FOOD_DETAIL, Menu.CATEGORY_SYSTEM, "菜品详情").setIcon(

R.drawable.zqz_menu_lookdetail);

menu.add(1, CONFIRM_PURCHASE, Menu.CATEGORY_SYSTEM, "加入购物车").setIcon(

R.drawable.zqz_menu_purchase);

return true;

}

/**

* 监听用户选中事件

*/

public boolean onOptionsItemSelected(MenuItem item) {

super.onOptionsItemSelected(item);

switch (item.getItemId()) {

case SHOW_FOOD_DETAIL:

// 跳转到详情显示页面

Intent intent = new Intent(ActivityShowFoodByType.this, FoodDetail.class);

intent.putExtra("foodId", selectedFood.foodId);

intent.putExtra("foodName", selectedFood.foodName);

intent.putExtra("foodDescri", selectedFood.foodDescri);

intent.putExtra("foodType", selectedFood.foodType);

intent.putExtra("foodPrice", selectedFood.foodPrice);

intent.putExtra("foodImage", selectedFood.foodImage);

startActivity(intent);

break;

case CONFIRM_PURCHASE:

Log.e("test==", "" CONFIRM_PURCHASE);

if (selectedFood.foodId != 0) {

// 跳转到购物车界面,并且提示用户输入要几份菜品

final View zqz_dialog = LayoutInflater.from(this).inflate(

R.layout.zqz_dialog, null);

// 提示用户输入数量

new AlertDialog.Builder(this).setTitle("选购").setIcon(

R.drawable.tap_vegetarian2).setView(zqz_dialog)

.setPositiveButton("订购", new OnClickListener() {

public void onClick(DialogInterface dialog,

int which) {

EditText etnumber = (EditText) zqz_dialog

.findViewById(R.id.zd_etnumber);

String etnumberStr = etnumber.getText()

.toString().trim();

if (!etnumberStr.equals("")

&& etnumberStr != null) {

db = new DButil(ActivityShowFoodByType.this);

ShopCart shopcart = new ShopCart();

shopcart.setFoodId(selectedFood.foodId);

shopcart.setFoodName(selectedFood.foodName);

shopcart

.setFoodPrice(selectedFood.foodPrice);

int foodnum = Integer.parseInt(etnumberStr);

shopcart.setFoodNum(foodnum);

// float sumprices = selectedFood.foodPrice

// * foodnum;

float sumprices = getTotalMoney(

selectedFood.foodPrice, foodnum);

shopcart.setSumPrices(sumprices);

db.addFood(shopcart);

db.close();

Log.e("-------- shopcart", "" shopcart);

Intent intent = new Intent(

ActivityShowFoodByType.this,

ShopCartShowAll.class);

Bundle extras = new Bundle();

extras

.putInt("foodId",

selectedFood.foodId);

extras.putFloat("foodPrice",

selectedFood.foodPrice);

extras.putInt("foodNumber", Integer

.parseInt(etnumberStr));

extras.putString("foodName",

selectedFood.foodName);

extras.putString("用户名", "");

extras.putInt("用户Id", 0);

intent.putExtras(extras);

startActivity(intent);

} else {

Toast.makeText(ActivityShowFoodByType.this,

"请输入数量", Toast.LENGTH_SHORT).show();

}

}

}).setNegativeButton("取消", new OnClickListener() {

public void onClick(DialogInterface dialog,

int which) {

}

}).create().show();

} else {

Toast.makeText(ActivityShowFoodByType.this, "请选中菜品",

Toast.LENGTH_LONG).show();

}

break;

}// end of switch

return true;

}// end of onOptionsItemSelected()

/**

* 计算(可能含小数位)总金额

*/

private float getTotalMoney(float price, int number) {

BigDecimal bd_price = new BigDecimal(price);

BigDecimal bd_number = new BigDecimal(number);

return bd_price.multiply(bd_number).floatValue();

}// end of getTotalMoney()

/**

* Bean对象，用来封装GridView中的一个数据

*

* @author zhuqiuzhu

*

*/

public final class ViewHolder {

public ImageView foodImagView;

public TextView foodNameView;

public TextView foodPriceView;

}

class MyGridViewAdapter extends BaseAdapter {

LayoutInflater mInflater = null;

public MyGridViewAdapter(Context ctx) {

mInflater = LayoutInflater.from(ctx);

}

// 返回需要显示的数据集合的size

public int getCount() {

return data.size();

}

// 返回指定集合位置的子项数据

public Object getItem(int position) {

return data.get(position);

}

// 返回指定集合子项的ID号

public long getItemId(int position) {

return position;

}

// 返回某一条数据的视图

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

ViewHolder holder = null;

// 若GridView 传进来的代表上一行数据的视图参数arg1为空，代表当前是第一行数据

// 这个时候则解析代表一行数据的视图展现的xml文件zqz_gridview.xml

// 并且把视图里的控件和bean对象里的控件关联起来

if (convertView == null) {

holder = new ViewHolder();

convertView = mInflater.inflate(R.layout.zqz_gridview, null);

holder.foodImagView = (ImageView) convertView

.findViewById(R.id.zg_gridicon);

holder.foodNameView = (TextView) convertView

.findViewById(R.id.zg_gridname);

holder.foodPriceView = (TextView) convertView

.findViewById(R.id.zg_gridprice);

// 设置标识

convertView.setTag(holder);

} else {

// 如果传进来的arg1不为空，则我们可以沿用上一行数据的视图，

holder = (ViewHolder) convertView.getTag();

}

// 只是需要将数据替换成本行的数据即可

/*-------------图片的显示实现--------------*/

String fi = ((HashMap) data.get(position)).get(

"icon").toString();

String mUrl = GetNetWorkData.getAssignedFoodBitmapUrl(

GetNetWorkData.URL, fi);

GetNetWorkData.setAssignedFoodBimapView(mUrl, holder.foodImagView);

/*----------------------------------------*/

holder.foodNameView.setText(((HashMap) data

.get(position)).get("name").toString());

holder.foodPriceView.setText(((HashMap) data

.get(position)).get("price").toString());

return convertView;

}

}// end of MyGridViewAdapter

}