手指上的Android之实战篇(六)

指尖上的Android之实战篇(六)

本来准备周末看NBA，可是这两天都没比赛，要到礼拜一，悲吹的上班族手指上的Android之实战篇(六)

最近来感觉进步缓慢，难道是天气越来越热的缘故手指上的Android之实战篇(六) ，开玩笑了，今天冒雨来公司加班，接着完善这个的项目的其他的功能模块。

今天说的模块是：查看流拍的物品—(各位童鞋的可以参照李刚的书19章的项目，往大家拍砖)

它对应的Servlet是ViewFailServlet，返回的数据为：

JSON数据，类似如下：

[{"id":3,"endtime":"2012-03-28","initPrice":21000,"addtime":"2012-03-21","itemName":"The old house","bids":[],"maxPrice":25000,"itemRemark":"Old house","itemDesc":"40 years old house","kind":"house property"}]

1. 查看流拍的物品的程序界面：view_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:gravity="center"  
  android:background="@drawable/bg"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <LinearLayout
  android:orientation="horizontal"
  android:gravity="center"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:layout_margin="@dimen/sub_title_margin"
  >
  	<TextView
  	android:id="@+id/view_title"
  	android:text="@string/view_succ"
  	android:textSize="@dimen/label_font_size"
  	android:textColor="@color/white" 
  	android:layout_width="wrap_content"
  	android:layout_height="wrap_content"
  	/>
  	<!-- 定义返回按钮 -->
  	<Button
  	android:id="@+id/bn_home"
  	android:layout_width="wrap_content"
  	android:layout_height="wrap_content"
  	android:layout_marginLeft="@dimen/label_font_size"
  	android:background="@drawable/home"
  	/>
  </LinearLayout>
  <ListView
  android:id="@+id/succList"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  />
</LinearLayout>

2.查看流拍物品的Activity：ViewItem.java

package com.infy.auction.client;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.infy.auction.client.util.DialogUtil;
import com.infy.auction.client.util.HttpUtil;
import com.infy.auction.client.util.JSONArrayAdapter;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;

public class ViewItem extends Activity{
	Button bnHome;
	ListView succList;
	TextView viewTitle;
	private static final String TAG="ViewItem";
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.view_item);
		//获取界面上的组件
		bnHome = (Button)findViewById(R.id.bn_home);
		succList = (ListView)findViewById(R.id.succList);
		viewTitle =(TextView) findViewById(R.id.view_title);
	
		//为返回按钮绑定事件监听器
		bnHome.setOnClickListener(new FinishListener(this));
		
		String action = getIntent().getStringExtra("action");
		//定义发送的URL
		String url = HttpUtil.BASE_URL+action;
		
		if(action.equals("ViewFailServlet")){
			viewTitle.setText(R.string.view_fial);
		}
		
		try{
			//向指定URL发送请求，并把服务器响应转化成JSONArry对象
			JSONArray jsonArray = new JSONArray(HttpUtil.getRequest(url));
			
			//将JSONArray包装成Adapter
			JSONArrayAdapter jsonAdapter = new JSONArrayAdapter(ViewItem.this, jsonArray, "itemName", true);
			
			succList.setAdapter(jsonAdapter);
			
		}catch(Exception e){
			DialogUtil.showDialog(this, "服务器响应异常，请稍后再试！",false);
			e.printStackTrace();
		}
		
		succList.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view, int position,
					long id) {
				// TODO Auto-generated method stub
				//查看指定的物品
				viewItemDetail(position);
				
			}
		});
		
	}
	
	//查看指定的物品
	private void viewItemDetail(int postiton){
		//加载detail.xml界面布局代表视图
		View detailView = getLayoutInflater().inflate(R.layout.detail, null);
		//获取detail.xml界面布局文件中的文本框
		EditText itemName= (EditText)detailView.findViewById(R.id.itemName);
		
		
		EditText itemKind = (EditText)detailView.findViewById(R.id.itemKind);
		EditText maxPrice = (EditText)detailView.findViewById(R.id.maxPrice);
		EditText itemRemark =(EditText)detailView.findViewById(R.id.itemRemark);
		
		//获取被单击的列表项
		JSONObject jsonObject = (JSONObject)succList.getAdapter().getItem(postiton);
		
		try{
			//通过文本显示物品详情
			Log.i(TAG, "itemKind--01>"+jsonObject.getString("itemName"));
			Log.i(TAG, "itemKind--02>"+jsonObject.getDouble("maxPrice")+"");
			Log.i(TAG, "itemKind--03>"+jsonObject.getString("itemDesc"));
			itemName.setText(jsonObject.getString("itemName"));
			itemKind.setText(jsonObject.getString("kind"));
//			Log.i(TAG, "itemKind--01>"+jsonObject.getString("kind"));
			maxPrice.setText(jsonObject.getDouble("maxPrice")+"");
			itemRemark.setText(jsonObject.getString("itemDesc"));
			
		}catch(JSONException e){
			e.printStackTrace();
		}
		DialogUtil.showDialog(ViewItem.this, detailView);
	}

}

3.这里上面用到了把一个JSON对象，转化成数组来处理，在对JSON数组进行包装，作为ListView的内容的Adapter的工具类：JSONArrayAdapter.java

package com.infy.auction.client.util;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.infy.auction.client.R;

import android.content.Context;
import android.graphics.Color;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class JSONArrayAdapter extends BaseAdapter{

	private Context ctx;
	//定义需要包装的JSONArray对象
	private JSONArray jsonArray;
	//定义列表显示JSONOBject对象的那个属性
	private String property;
	private boolean hasIcon;
	
	public JSONArrayAdapter(Context ctx,JSONArray jsonArray,String property,boolean hasIcon) {
		// TODO Auto-generated constructor stub
	  this.ctx = ctx;
	  this.jsonArray = jsonArray;
	  this.property = property;
	  this.hasIcon  = hasIcon;
	
	}

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

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

	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
	
		try{
			
			return ((JSONObject)getItem(position)).getInt("id");
		}catch(JSONException e){
			e.printStackTrace();
		}
		return 0;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		
		//定义一个线性布局管理器
		LinearLayout linear = new LinearLayout(ctx);
		//设置为水平的线性布局管理器
		linear.setOrientation(0);
		//创建一个ImageView
		ImageView iv = new ImageView(ctx);
		iv.setPadding(10, 0, 20, 0);
		iv.setImageResource(R.drawable.item);
		//将图片添加到LinearLayout中
		linear.addView(iv);
		//创建一个TextView
		TextView tv = new TextView(ctx);
		
		try{

				//获取JSONArray数组元素的property属性
				String itemName = ((JSONObject)getItem(position)).getString(property);
				//设置显示的Textview所显示的内容
				tv.setText(itemName);
			
			
		}catch(JSONException e){
			e.printStackTrace();
		}
		
		tv.setTextSize(20);
		
		if(hasIcon){
			//将TextView添加到LinearLayout
			linear.addView(tv);
			return linear;
		}else{
			tv.setTextColor(Color.BLACK);
			return tv;
		}
	}
	
}

最后查看流拍物品的记录的效果图如下：

手指上的Android之实战篇(六)

手指上的Android之实战篇(六)

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