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(); } }