指尖上的Android之实战篇(三)

先给出我们用到的工具类

1.发送请求的工具类

本实例采用HttpClient与服务器通信，用到了一个工具类对Httpclient进行封装：定义了两个方法来发送请求

getRequest:发送GET请求

postRequest :发送POST请求

HttpUtil.java(注意IP地址换成自己的IP地址,这个BASE_URL = "http://losthost:8080/auction/，要不然，你就)

package com.infy.auction.client.util;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import android.util.Log;

public class HttpUtil {

	private static final String TAG="HttpUtil";
	//创建HttpCilent对象
	public static HttpClient httpClient = new DefaultHttpClient();
	public static final String BASE_URL = "http://losthost:8080/auction/";
	
	//发送url的请求，服务器响应字符串
	public static String getRequest(String url) throws  Exception{
		//创建一个HttpGet对象
		HttpGet get = new HttpGet(url);
		//发送GET请求
		HttpResponse httpResponse = httpClient.execute(get);
		Log.i(TAG, "getReq ==getStatusCode--->" +httpResponse.getStatusLine().getStatusCode());
		//如果服务器成功地返回响应
		if(httpResponse.getStatusLine().getStatusCode() == 200){
			//获取响应的字符串
			String result = EntityUtils.toString(httpResponse.getEntity());
			Log.i(TAG, "getReq ==result--->" +result);
			return result;
		}
		return "";
	}
	//发送Post请求
	public static String postRequest(String url,Map<String, String> rawParams) throws Exception{
	
		Log.i(TAG, "postRequest--->begin");
		
		//创建HttpPost对象
		HttpPost post = new HttpPost(url);
		//如果传递的参数个数比较多，可以对传递的参数进行封装
		List<NameValuePair> params = new ArrayList<NameValuePair>();
		for(String key:rawParams.keySet()){
			//封装请求的参数
			params.add(new BasicNameValuePair(key, rawParams.get(key)));
			
		}
		//设置请求的参数
		post.setEntity(new UrlEncodedFormEntity(params,"utf-8"));
		//发送Post请求
		HttpResponse httpResponse = httpClient.execute(post);
		//如果服务器成功地返回响应
		Log.i(TAG, "HttpL---->" +httpResponse.getStatusLine().getStatusCode());
		if(httpResponse.getStatusLine().getStatusCode() == 200){
			//获取响应的字符串
			String result = EntityUtils.toString(httpResponse.getEntity());
			Log.i(TAG, "response-->" +result);
			return result;
		}
		
	return null;	
	}
	
}

2. 显示各种对话框的工具类：Dialog.xml

package com.infy.auction.client.util;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.view.View;

public class DialogUtil {

	//定义一个显示消息的对话框
	public static void showDialog(final Context ctx , String msg, boolean closeSelf) {
		// TODO Auto-generated method stub
		//创建一个AlertDialog.Builder对象
		AlertDialog.Builder builder = new AlertDialog.Builder(ctx).setMessage(msg).setCancelable(false);
		
		if(closeSelf){
			builder.setPositiveButton("确定", new OnClickListener() {
				
				@Override
				public void onClick(DialogInterface dialog, int which) {
					// TODO Auto-generated method stub
				//结束当前Activity
					((Activity)ctx).finish();
				}
			});
		}else{
			builder.setPositiveButton("确定", null);
		}
		builder.create().show();
	}

	//定义一个显示指定组件的对话框
	public static void showDialog(Context ctx,View view){
		AlertDialog.Builder  builder = new AlertDialog.Builder(ctx).setView(view).setCancelable(false).setPositiveButton("确定", null);
		builder.create().show();
	}
}