因为项目中需要用到天气预报功能，所以就自己研究了下，
欢迎转载请加地址http://blog.csdn.net/jing110fei/article/details/38515275
首先得找到一个能用的接口，网上出现频率最高的接口是
http://m.weather.com.cn/data/101070101.html 其中101070101就是城市对应的ID
但是完成后，发现此接口2014年3月4日以后就不再更新了
然后又开始寻找，最后还是中国天气网的另一个接口http://m.weather.com.cn/atad/101070101.html 这个是可以用的。
找到可以用的接口，基本就松口气了，接下来就是取数据的事了。
怎么取数据呢，我们一般是输入一个城市名字，期望得到它未来三天的天气状况，
看上面的接口就知道我们需要解决另一个问题，就是城市对应的ID，我也很抓狂，幸好在网上有前辈整理了基本全部的城市ID。。PS：不得不在这里给这位前辈点个赞！
如上图，将此文件放在了assets文件夹下，好了废话不说，贴出主要代码。
主文件的布局文件activity_weather_main.xml
<LinearLayout 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"
android:orientation="vertical">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<EditText
android:id="@+id/city_name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="请输入城市名字"
android:layout_weight="1"/>
<Button
android:id="@+id/query_cityID"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="查询城市ID"
/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/city_id"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@drawable/setbar_bg"
android:hint="将在此处显示城市ID"
android:textSize="18sp"
android:layout_weight="1"/>
<Button
android:id="@+id/query_weather"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="查询天气"
android:layout_weight="1"
/>
</LinearLayout>
<ListView
android:id="@+id/query_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
然后是listview的显示布局listview_form.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<TextView
android:id="@+id/name"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
/>
<TextView
android:id="@+id/message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
/>
</LinearLayout>
然后是主MainActivity的代码WeatherMainActivity.java
public class WeatherMainActivity extends Activity implements OnClickListener {
//定义 输入城市名字控件
private EditText citynameText;
//定义查询城市ID和查询天气的两个Button
private Button query_city_id,query_weather;
//定义显示城市ID的TextView
private TextView cityIDView;
//listview用于显示查询到的天气信息
private ListView listview;
//listview需要的显示格式即是一个个的键值对，比如天气--------晴
private HashMap<String,String> message_map;
//listview需要的天气显示格式 将上面的键值对全部存起来
private ArrayList<HashMap<String,String>> message_list;
//用于线程间通讯
private Handler handler;
//发送消息更新视图
private static final int VIEW_UPDATE=1;
private SimpleAdapter SA;
//查询天气线程
private Thread thread;
//定义城市名字和ID
String name="";
String id="";
//判断获取天气数据成功与否的标识
private int count=0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_weather_main);
citynameText=(EditText)findViewById(R.id.city_name);
cityIDView=(TextView)findViewById(R.id.city_id);
//用来查找城市ID
query_city_id=(Button)findViewById(R.id.query_cityID);
query_city_id.setOnClickListener(this);
//用来查询天气
query_weather=(Button)findViewById(R.id.query_weather);
query_weather.setOnClickListener(this);
message_list = new ArrayList<HashMap<String,String>>();
listview = (ListView)findViewById(R.id.query_list);
SA = new SimpleAdapter(this, message_list, R.layout.listview_form, new String[]{"name","message"}, new int[]{R.id.name,R.id.message});
listview.setAdapter(SA);
//定义handle对返回结果进行响应
handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case VIEW_UPDATE:
//更新listView的数据
SA.notifyDataSetChanged();
break;
case 3:
Toast.makeText(WeatherMainActivity.this, "查询天气失败，可能是网络原因，请检查网络连接", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
};
}
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.query_cityID:
name=citynameText.getText().toString();
id=findId(name);
if(null==id||"".equals(id)){
Toast.makeText(WeatherMainActivity.this, "在集合中，没有找到对应城市id", 1).show();
}else{
cityIDView.setText(id);
}
break;
case R.id.query_weather:
if (null==id||"".equals(id)) {
Toast.makeText(WeatherMainActivity.this, "请先查询城市ID", 1).show();
}else {
queryWeather();
}
break;
default:
break;
}
}
private String findId(String cityname){
if(null==cityname||"".equals(cityname))
return null;
try {
InputStreamReader inputReader = new InputStreamReader(getResources().getAssets().open("citycode.txt") );
BufferedReader bufReader = new BufferedReader(inputReader);
String line="";
String[] str = new String[2];
while((line = bufReader.readLine()) != null){
str = line.split("=");
if(str.length==2&&null!=str[1]&&!"".equals(str[1])&&cityname.equals(str[1])){
//返回对应编号
return str[0];
}
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
return null;
}
// 向中国天气网查询数据
private void queryWeather(){
thread = new Thread(){
@Override
public void run() {
super.run();
//创建返回的天气信息对象，是一个对象数组，用来放3天的天气
WeatherForm[] WF = new WeatherForm[3];
//查询天气，返回3天的天气信息
WeatherQueryManage WQM = new WeatherQueryManageImpl();
WF = WQM.weatherquery(id);
message_list.clear();
if(WF.length>=1){
message_map = new HashMap<String, String>();
message_map.put("name", WF[0].getName()+":");
message_map.put("message", WF[0].getDdate()+"-"+WF[0].getWeek());
message_list.add(message_map);
for(int i=0;i<WF.length;i++){
message_map = new HashMap<String, String>();
if(i==0){
message_map.put("name", "--------");
message_map.put("message", "--------今天--------------");
message_list.add(message_map);
}
if(i==1){
message_map.put("name", "--------");
message_map.put("message", "--------明天--------------");
message_list.add(message_map);
}
if(i==2){
message_map.put("name", "--------");
message_map.put("message", "--------后天--------------");
message_list.add(message_map);
}
message_map = new HashMap<String, String>();
message_map.put("name", "温度:");
message_map.put("message",WF[i].getTemp());
message_list.add(message_map);
message_map = new HashMap<String, String>();
message_map.put("name", "天气状况:");
message_map.put("message", WF[i].getWeather());
message_list.add(message_map);
message_map = new HashMap<String, String>();
message_map.put("name", "风力:");
message_map.put("message", WF[i].getWind());
message_list.add(message_map);
if(WF[i].getWind()==null||"".equals(WF[i].getWind())){
++count;
}
}
}
if(count==3){
Message message = new Message();
message.what=count;
handler.sendMessage(message);
}else {
Message message = new Message();
message.what=VIEW_UPDATE;
handler.sendMessage(message);
}
}
};
thread.start();
}
}
接下来是查询到的数据定义为天气对象WeatherForm.java
public class WeatherForm {
//城市名
private String name;
//城市编号
private String id;
//当前日期
private String ddate;
//星期
private String week;
//温度
private String temp;
//天气描述
private String weather;
//风力
private String wind;
//风向
private String fx;
public WeatherForm(){
}
public WeatherForm(String name, String id, String ddate, String week,
String temp, String weather, String wind, String fx) {
super();
this.name = name;
this.id = id;
this.ddate = ddate;
this.week = week;
this.temp = temp;
this.weather = weather;
this.wind = wind;
this.fx = fx;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getDdate() {
return ddate;
}
public void setDdate(String ddate) {
this.ddate = ddate;
}
public String getWeek() {
return week;
}
public void setWeek(String week) {
this.week = week;
}
public String getTemp() {
return temp;
}
public void setTemp(String temp) {
this.temp = temp;
}
public String getWeather() {
return weather;
}
public void setWeather(String weather) {
this.weather = weather;
}
public String getWind() {
return wind;
}
public void setWind(String wind) {
this.wind = wind;
}
public String getFx() {
return fx;
}
public void setFx(String fx) {
this.fx = fx;
}
@Override
public String toString() {
return "WeatherForm [name=" + name + ", id=" + id + ", ddate=" + ddate
+ ", week=" + week + ", temp=" + temp + ", weather=" + weather
+ ", wind=" + wind + ", fx=" + fx + "]";
}
}
接下来是查询天气的接口的定义WeatherQueryManage.java
public interface WeatherQueryManage {
//查询天气方法
// 参数 CityId 对应城市的id
//返回值 暂时返回3天的天气数据
public WeatherForm[] weatherquery(String CityId);
}
然后是对应接口的实现
public class WeatherQueryManageImpl implements WeatherQueryManage {
public WeatherForm[] weatherquery(String CityId) {
WeatherForm[] WF = new WeatherForm[3];
//http://m.weather.com.cn/data/101070101.html
//String URL = "http://m.weather.com.cn/data/"+CityId+".html";
//http://m.weather.com.cn/atad/101070101.html
String URL="http://m.weather.com.cn/atad/"+CityId+".html";
String Weather_Result="";
HttpGet httpRequest = new HttpGet(URL);
// 获得HttpResponse对象
try {
HttpClient httpClient = new DefaultHttpClient();
HttpResponse httpResponse = httpClient.execute(httpRequest);
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
// 取得返回的数据
Weather_Result = EntityUtils.toString(httpResponse.getEntity());
}
} catch (Exception e) {
WF[0] = new WeatherForm();
WF[1] = new WeatherForm();
WF[2] = new WeatherForm();
return WF;
}
//以下是对返回JSON数据的解析
if(null!=Weather_Result&&!"".equals(Weather_Result)){
try {
JSONObject JO = new JSONObject(Weather_Result).getJSONObject("weatherinfo");
//
for(int i=0;i<WF.length;i++){
WeatherForm weaf = new WeatherForm();
weaf.setName(JO.getString("city"));
weaf.setDdate(JO.getString("date_y"));
weaf.setWeek(JO.getString("week"));
weaf.setTemp(JO.getString("temp"+(i+1)));
weaf.setWind(JO.getString("wind"+(i+1)));
weaf.setWeather(JO.getString("weather"+(i+1)));
WF[i]=weaf;
}
} catch (JSONException e) {
WF[0] = new WeatherForm();
WF[1] = new WeatherForm();
WF[2] = new WeatherForm();
return WF;
}
}
return WF;
}
}
以上就是全部代码了。。。我这里运行正常，在接口的实现里，第一个注释掉的网址就是之前说的那个不更新的那个地址
对了，别忘了在AndroidManifest.xml中加上访问网络的权限。
<uses-permission android:name="android.permission.INTERNET"/>
OK，结束了，欢迎各位童鞋一起来讨论哈，有好的想法也希望能够告诉我。