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相信大家在平常的开发中,对网络的操作用到HTTP协议比较多,通过我们使用Get或者Post的方法调用一个数据接口,然后服务器给我们返回JSON格式的数据,我们解析JSON数据然后展现给用户,相信很多人很喜欢服务器给我们返回JSON数据格式,因为他解析方便,也有一些JSON的解析库,例如Google提供的GSON,阿里巴巴的FastJson,不过还是推荐大家使用FastJson来解析,我自己开发中也是用FastJson来解析,FastJson的介绍http://code.alibabatech.com/wiki/display/FastJSON/Home,不过有时候我们用到WebService接口来获取数据, WebService是一种基于SOAP协议的远程调用标准,通过webservice可以将不同操作系统平台、不同语言、不同技术整合到一块。在Android SDK中并没有提供调用WebService的库,因此,需要使用第三方的SDK来调用WebService。PC版本的WEbservice客户端库非常丰富,例如Axis2,CXF等,但这些开发包对于Android系统过于庞大,也未必很容易移植到Android系统中。因此,这些开发包并不是在我们的考虑范围内。适合手机的WebService客户端的SDK有一些,比较常用的有Ksoap2,可以从http://code.google.com/p/ksoap2-android/wiki/HowToUse?tm=2进行下载,将jar包加入到libs目录下就行了,接下来带大家来调用WebService接口
首先我们新建一个工程,取名WebServiceDemo,我们从http://www.webxml.com.cn/zh_cn/web_services.aspx来获取WebService接口,这里面有一些免费的WebService接口,我们就用里面的天气接口吧http://www.webxml.com.cn/WebServices/WeatherWebService.asmx
我们新建一个WebService的工具类,用于对WebService接口的调用,以后遇到调用WebService直接拷贝来用就行了
package com.example.webservicedemo; import java.io.IOException; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import org.ksoap2.SoapEnvelope; import org.ksoap2.serialization.SoapObject; import org.ksoap2.serialization.SoapSerializationEnvelope; import org.ksoap2.transport.HttpResponseException; import org.ksoap2.transport.HttpTransportSE; import org.xmlpull.v1.XmlPullParserException; import android.os.Handler; import android.os.Message; /** * 访问WebService的工具类, * * @see http://blog.csdn.net/xiaanming * * @author xiaanming * */ public class WebServiceUtils { public static final String WEB_SERVER_URL = "http://www.webxml.com.cn/WebServices/WeatherWebService.asmx"; // 含有3个线程的线程池 private static final ExecutorService executorService = Executors .newFixedThreadPool(3); // 命名空间 private static final String NAMESPACE = "http://WebXml.com.cn/"; /** * * @param url * WebService服务器地址 * @param methodName * WebService的调用方法名 * @param properties * WebService的参数 * @param webServiceCallBack * 回调接口 */ public static void callWebService(String url, final String methodName, HashMap<String, String> properties, final WebServiceCallBack webServiceCallBack) { // 创建HttpTransportSE对象,传递WebService服务器地址 final HttpTransportSE httpTransportSE = new HttpTransportSE(url); // 创建SoapObject对象 SoapObject soapObject = new SoapObject(NAMESPACE, methodName); // SoapObject添加参数 if (properties != null) { for (Iterator<Map.Entry<String, String>> it = properties.entrySet() .iterator(); it.hasNext();) { Map.Entry<String, String> entry = it.next(); soapObject.addProperty(entry.getKey(), entry.getValue()); } } // 实例化SoapSerializationEnvelope,传入WebService的SOAP协议的版本号 final SoapSerializationEnvelope soapEnvelope = new SoapSerializationEnvelope( SoapEnvelope.VER11); // 设置是否调用的是.Net开发的WebService soapEnvelope.setOutputSoapObject(soapObject); soapEnvelope.dotNet = true; httpTransportSE.debug = true; // 用于子线程与主线程通信的Handler final Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); // 将返回值回调到callBack的参数中 webServiceCallBack.callBack((SoapObject) msg.obj); } }; // 开启线程去访问WebService executorService.submit(new Runnable() { @Override public void run() { SoapObject resultSoapObject = null; try { httpTransportSE.call(NAMESPACE + methodName, soapEnvelope); if (soapEnvelope.getResponse() != null) { // 获取服务器响应返回的SoapObject resultSoapObject = (SoapObject) soapEnvelope.bodyIn; } } catch (HttpResponseException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (XmlPullParserException e) { e.printStackTrace(); } finally { // 将获取的消息利用Handler发送到主线程 mHandler.sendMessage(mHandler.obtainMessage(0, resultSoapObject)); } } }); } /** * * * @author xiaanming * */ public interface WebServiceCallBack { public void callBack(SoapObject result); } }
我们通过调用里面的callWebService(String url, final String methodName,HashMap<String, String> properties,final WebServiceCallBack webServiceCallBack)就可以来获取我们想要的数据,现在讲解下里面的实现思路
我们先用一个ListView来显示所有的省份,然后点击每个省进去到市。市也用一个ListView来显示,最后点击市用TextView来显示获取的WebService天气情况,思路很简单
用来显示省份的布局,里面只有一个ListView
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" > <ListView android:id="@+id/province_list" android:layout_width="match_parent" android:layout_height="wrap_content" android:cacheColorHint="@android:color/transparent" android:fadingEdge="none" > </ListView> </RelativeLayout>
接下来就是Activity的代码,先用工具类调用WebService方法,然后在回调方法callBack(SoapObject result)中解析数据到一个List<String>中,在设置ListView的适配器
package com.example.webservicedemo; import java.util.ArrayList; import java.util.List; import org.ksoap2.serialization.SoapObject; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.Toast; import com.example.webservicedemo.WebServiceUtils.WebServiceCallBack; /** * 显示天气省份的Activity * * @see http://blog.csdn.net/xiaanming * * @author xiaanming * */ public class MainActivity extends Activity { private List<String> provinceList = new ArrayList<String>(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); init(); } private void init() { final ListView mProvinceList = (ListView) findViewById(R.id.province_list); //显示进度条 ProgressDialogUtils.showProgressDialog(this, "数据加载中..."); //通过工具类调用WebService接口 WebServiceUtils.callWebService(WebServiceUtils.WEB_SERVER_URL, "getSupportProvince", null, new WebServiceCallBack() { //WebService接口返回的数据回调到这个方法中 @Override public void callBack(SoapObject result) { //关闭进度条 ProgressDialogUtils.dismissProgressDialog(); if(result != null){ provinceList = parseSoapObject(result); mProvinceList.setAdapter(new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, provinceList)); }else{ Toast.makeText(MainActivity.this, "获取WebService数据错误", Toast.LENGTH_SHORT).show(); } } }); mProvinceList.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Intent intent = new Intent(MainActivity.this, CityActivity.class); intent.putExtra("province", provinceList.get(position)); startActivity(intent); } }); } /** * 解析SoapObject对象 * @param result * @return */ private List<String> parseSoapObject(SoapObject result){ List<String> list = new ArrayList<String>(); SoapObject provinceSoapObject = (SoapObject) result.getProperty("getSupportProvinceResult"); if(provinceSoapObject == null) { return null; } for(int i=0; i<provinceSoapObject.getPropertyCount(); i++){ list.add(provinceSoapObject.getProperty(i).toString()); } return list; } }
点击省份进入该省份下面的市。也用一个ListView来显示市的数据,布局跟上面一样,Activity里面的代码也差不多相似,我就不过多说明了,直接看代码
package com.example.webservicedemo; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import org.ksoap2.serialization.SoapObject; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.Toast; import com.example.webservicedemo.WebServiceUtils.WebServiceCallBack; /** * 显示城市的Activity * * @see http://blog.csdn.net/xiaanming * * @author xiaanming * */ public class CityActivity extends Activity { private List<String> cityStringList; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); init(); } private void init() { final ListView mCityList = (ListView) findViewById(R.id.province_list); //显示进度条 ProgressDialogUtils.showProgressDialog(this, "数据加载中..."); //添加参数 HashMap<String, String> properties = new HashMap<String, String>(); properties.put("byProvinceName", getIntent().getStringExtra("province")); WebServiceUtils.callWebService(WebServiceUtils.WEB_SERVER_URL, "getSupportCity", properties, new WebServiceCallBack() { @Override public void callBack(SoapObject result) { ProgressDialogUtils.dismissProgressDialog(); if(result != null){ cityStringList = parseSoapObject(result); mCityList.setAdapter(new ArrayAdapter<String>(CityActivity.this, android.R.layout.simple_list_item_1, cityStringList)); }else{ Toast.makeText(CityActivity.this, "获取WebService数据错误", Toast.LENGTH_SHORT).show(); } } }); mCityList.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Intent intent = new Intent(CityActivity.this, WeatherActivity.class); intent.putExtra("city", cityStringList.get(position)); startActivity(intent); } }); } /** * 解析SoapObject对象 * @param result * @return */ private List<String> parseSoapObject(SoapObject result){ List<String> list = new ArrayList<String>(); SoapObject provinceSoapObject = (SoapObject) result.getProperty("getSupportCityResult"); for(int i=0; i<provinceSoapObject.getPropertyCount(); i++){ String cityString = provinceSoapObject.getProperty(i).toString(); list.add(cityString.substring(0, cityString.indexOf("(")).trim()); } return list; } }
接下来就是点击相对应的城市调用WebService接口来获取该城市下面的天气详情啦,为了简单起见,我用一个TextView来显示天气信息,因为天气信息很多,一个屏幕显示不完,所以我们考虑在外面加一个ScrollView来进行滚动
<?xml version="1.0" encoding="UTF-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" > <ScrollView android:layout_width="fill_parent" android:layout_height="fill_parent" > <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" > <TextView android:id="@+id/weather" android:textColor="#336598" android:textSize="16sp" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout> </ScrollView> </RelativeLayout>
Activity的代码就不做过多说明,跟上面的大同小异
package com.example.webservicedemo; import java.util.HashMap; import org.ksoap2.serialization.SoapObject; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; import android.widget.Toast; import com.example.webservicedemo.WebServiceUtils.WebServiceCallBack; /** * 显示天气的Activity * * @see http://blog.csdn.net/xiaanming * * @author xiaanming * */ public class WeatherActivity extends Activity{ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.weather_layout); init(); } private void init() { final TextView mTextWeather = (TextView) findViewById(R.id.weather); ProgressDialogUtils.showProgressDialog(this, "数据加载中..."); HashMap<String, String> properties = new HashMap<String, String>(); properties.put("theCityName", getIntent().getStringExtra("city")); WebServiceUtils.callWebService(WebServiceUtils.WEB_SERVER_URL, "getWeatherbyCityName", properties, new WebServiceCallBack() { @Override public void callBack(SoapObject result) { ProgressDialogUtils.dismissProgressDialog(); if(result != null){ SoapObject detail = (SoapObject) result.getProperty("getWeatherbyCityNameResult"); StringBuilder sb = new StringBuilder(); for(int i=0; i<detail.getPropertyCount(); i++){ sb.append(detail.getProperty(i)).append("\r\n"); } mTextWeather.setText(sb.toString()); }else{ Toast.makeText(WeatherActivity.this, "获取WebService数据错误", Toast.LENGTH_SHORT).show(); } } }); } }
到这里我们就完成了编码工作,在运行程序之前我们需要在AndroidManifest.xml注册Activity,以及添加访问网络的权限
<application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.webservicedemo.MainActivity" android:label="@string/title_activity_main" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".CityActivity"/> <activity android:name=".WeatherActivity"></activity> </application> <uses-permission android:name="android.permission.INTERNET"/>
运行结果:
省份,城市列表可以加上A-Z的排序功能,可以参考下Android实现ListView的A-Z字母排序和过滤搜索功能,实现汉字转成拼音,我这里就不添加了,需要添加的朋友自行实现,好了,今天的讲解到此结束,有疑问的朋友请在下面留言。
via:http://blog.csdn.net/xiaanming/article/details/17483273
从零开始学android开发-通过WebService进行网络编程,使用工具类轻松实现
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原文地址:http://www.cnblogs.com/dekevin/p/4290481.html