安卓实现天气预报功能

此篇文章主要针对初学者，讲述了如何如何利用webservice访问天气预报接口获取网络数据，对返回结果的处理，以及如何利用Handler更新主线程UI。先看效果图：

接下来看主程序：

package com.example.getweather;

import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Color;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

private EditText cityname;
private Button btn;
private TextView textView;
private final int duration=Toast.LENGTH_LONG;
private String theCityName;
private String result;
private ProgressDialog progressDialog;

@SuppressLint("HandlerLeak")
private Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
progressDialog.dismiss();
switch (msg.what) {
case 1:
LinearLayout myLayout=(LinearLayout) findViewById(R.id.myLinearLayout);
PraseWeaTherUtil p=new PraseWeaTherUtil(result.substring(8, result.length()-2));
textView.setText("所在省/直辖市:"+p.getProvince());
myLayout.addView(getTextView("所在市:"+p.getCity()));
myLayout.addView(getTextView("时间:"+p.getTime()));
myLayout.addView(getTextView("温度:"+p.getNowDayTemperature()));
myLayout.addView(getTextView("今日天气:"+p.getNowDayWeaTher()));
myLayout.addView(getTextView("天气实况:"+p.getNowDayWeaTher_Detail()));
myLayout.addView(getTextView("风力:"+p.getWind_power()));
myLayout.addView(getTextView("明日天气:"+p.getWeaTher_Detail2()));
myLayout.addView(getTextView("温度:"+p.getTemperature2()));
myLayout.addView(getTextView("后天天气:"+p.getWeaTher_Detail3()));
myLayout.addView(getTextView("温度:"+p.getTemperature3()));
break;
case -1:
Toast.makeText(getApplicationContext(), "获取数据失败", duration).show();
break;
}
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView=(TextView)findViewById(R.id.textview);
cityname=(EditText)findViewById(R.id.cityname);
btn=(Button)findViewById(R.id.btn);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
theCityName=cityname.getText().toString();
if(null==theCityName||"".equals(theCityName)){
Toast.makeText(getApplicationContext(), "请填写要查询的城市", duration).show();
return;
}
progressDialog=new ProgressDialog(MainActivity.this);
progressDialog.setMessage("正在获取天气数据...");
progressDialog.show();
new Thread(new GetWeatherTask(theCityName)).start();
}
});

}

private class GetWeatherTask implements Runnable{

String theCityName="";

public GetWeatherTask(String theCityName) {
super();
this.theCityName = theCityName;
}

@Override
public void run() {
try{
result=getRemoteInfo(theCityName);
handler.obtainMessage(1).sendToTarget();
}catch(Exception e){
e.printStackTrace();
handler.obtainMessage(-1).sendToTarget();
}
}

}

private TextView getTextView(String content){
TextView tv=new TextView(this);
tv.setTextSize(16);
tv.setTextColor(Color.parseColor("#000000"));
tv.setText(content);
return tv;
}

/**
* 通过webservice获取城市天气
* @param theCityName
* @return
*/
public String getRemoteInfo(String theCityName) {
//http://WebXml.com.cn/getWeatherbyCityName
// 命名空间
String nameSpace = "http://WebXml.com.cn/";
// 调用的方法名称
String methodName = "getWeatherbyCityName";
// EndPoint通常是将WSDL地址末尾的"?WSDL"去除后剩余的部分
String endPoint = "http://webservice.webxml.com.cn/WebServices/WeatherWebService.asmx";
// SOAP Action通常为命名空间 + 调用的方法名称
String soapAction = "http://WebXml.com.cn/getWeatherbyCityName";

// 指定WebService的命名空间和调用的方法名
SoapObject rpc = new SoapObject(nameSpace, methodName);

// 设置需调用WebService接口需要传入的两个参数mobileCode、userId
rpc.addProperty("theCityName", theCityName);

// 生成调用WebService方法的SOAP请求信息,并指定SOAP的版本
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER10);

envelope.bodyOut = rpc;
// 设置是否调用的是dotNet开发的WebService
envelope.dotNet = true;
// 等价于envelope.bodyOut = rpc;
envelope.setOutputSoapObject(rpc);

HttpTransportSE transport = new HttpTransportSE(endPoint);
try {
// 调用WebService
transport.call(soapAction, envelope);
} catch (Exception e) {
e.printStackTrace();
}

// 获取返回的数据
SoapObject object = (SoapObject) envelope.bodyIn;

return object.getProperty(0).toString();
}

}

获取网络数据属于耗时操作，需要放在子线程进行，通过消息处理机制可以更新主线程UI，代码中我们看到有一个PraseWeaTherUtil类，这个是自己根据返回的天气数据格式写的一个解析类，此天气接口返回的数据形式如：anyType={string=xxx;string=xxx;}，它并不是json格式，所以需要自己写一个解析类，当然我这个解析类比较简单只是截取了一部分数据，大家也可以根据自己的需求，写一个自定义的解析类，下面截取部分代码：

public PraseWeaTherUtil(String result) {
super();
String results[]=result.replace("string=", "").split(";");
this.province=results[0];
this.city=results[1];
this.time=results[4];
this.nowDayTemperature=results[5];
this.nowDayWeaTher=results[6];
this.nowDayWeaTher_Detail=results[10];
this.WeaTher_Detail2=results[13];
this.temperature2=results[12];
this.WeaTher_Detail3=results[18];
this.temperature3=results[17];

}

详细解释已经在代码中写的很清楚，最后不要忘了写入访问网络权限，大家可以下载我的源码参考：

http://download.csdn.net/detail/baiyuliang2013/7091937