Android实现天气查询
这里实现 省份–城市–天气 的联动。即先选择省份，再选择城市，最后展示天气信息。
思路：通过访问：http://www.webxml.com.cn/webservices/weatherwebservice.asmx，通过给定的方式获得所需要的数据，在方法中解析xml成list，然后展示即可。
1：布局与权限：
<uses-permission android:name="android.permission.INTERNET" /><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" tools:context="com.inext.test.webview.WeatherActivity">
<Spinner android:id="@+id/pro" android:layout_width="match_parent" android:layout_height="wrap_content"></Spinner>
<Spinner android:id="@+id/city" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/pro" android:layout_alignParentStart="true"></Spinner>
<ScrollView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/city" android:layout_alignParentStart="true">
<TextView android:id="@+id/show" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/city" android:layout_alignParentStart="true" />
</ScrollView>
</RelativeLayout>2：xml解析类，用于解析从站点返回的xml流，返回list：
/** * Created by Administrator on 2016/5/10. * 解析xml工具类 */
public class XMLUtil {
private InputStream inputStream;
public XMLUtil(InputStream inputStream){
this.inputStream = inputStream;
}
//解析流成list
public List getAllElement() throws XmlPullParserException, IOException {
List list = null;
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser xpp = factory.newPullParser();
xpp.setInput(inputStream,"utf-8");
//事件
int eventType = xpp.getEventType();
String elementName = "";
//当事件不结束时
while (eventType!=XmlPullParser.END_DOCUMENT){
switch (eventType){
//开始
case XmlPullParser.START_DOCUMENT:
list = new ArrayList();
break;
//开始一个标签
case XmlPullParser.START_TAG:
//获得标签名称
elementName = xpp.getName();
break;
//获得标签内容
case XmlPullParser.TEXT:
if (elementName.equals("string")){
list.add(xpp.getText());
}
break;
//标签结束
case XmlPullParser.END_TAG:
break;
}
eventType = xpp.next();
}
return list;
}
}3：应用类：
public class WeatherActivity extends AppCompatActivity {
private List list_city,list_pro,list_data;
private Spinner pro,city;
private TextView show;
private Context context = getBaseContext();
private String cityName,proName,url_city,url_city_data;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_weather);
pro = (Spinner)findViewById(R.id.pro);
city = (Spinner)findViewById(R.id.city);
show = (TextView)findViewById(R.id.show);
//获取省份的地址
String url_pro = "http://www.webxml.com.cn/webservices/weatherwebservice.asmx/getSupportProvince";
//执行获取省份的异步操作
new MyAsync().execute(url_pro);
}
//获取省份。 城市和天气的获取与解析都是一样的思路
public class MyAsync extends AsyncTask<String,Void,List>{
@Override
protected List doInBackground(String... params) {
//调用getXml（）方法，（该方法在本类底部位置）
list_pro = getXml(params[0]);
return list_pro;
}
@Override
protected void onPostExecute(List list) {
super.onPostExecute(list);
if (list==null || list.size()==0){
return;
}
Toast.makeText(getBaseContext(),""+list.size(),Toast.LENGTH_SHORT).show();
ArrayAdapter arrayAdapter = new ArrayAdapter(getBaseContext(),android.R.layout.simple_dropdown_item_1line,list_pro);
pro.setAdapter(arrayAdapter);
pro.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
proName = pro.getSelectedItem().toString().trim();
//Toast.makeText(getBaseContext(),proName,Toast.LENGTH_SHORT).show();
url_city = "http://www.webxml.com.cn/webservices/weatherwebservice.asmx/getSupportCity?byProvinceName="+proName;
new MyAsyncCity().execute(url_city);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
}
//获取城市
public class MyAsyncCity extends AsyncTask<String,Void,List>{
@Override
protected List doInBackground(String... params) {
list_city = getXml(params[0]);
return list_city;
}
@Override
protected void onPostExecute(List list) {
super.onPostExecute(list);
if (list==null || list.size()==0){
return;
}
//Toast.makeText(getBaseContext(),""+list.size(),Toast.LENGTH_SHORT).show();
ArrayAdapter arrayAdapter = new ArrayAdapter(getBaseContext(),android.R.layout.simple_dropdown_item_1line,list_city);
city.setAdapter(arrayAdapter);
arrayAdapter.notifyDataSetChanged();
city.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
cityName = city.getSelectedItem().toString().trim();
cityName = cityName.split(" ")[0];
if (!city.equals("")){
url_city_data = "http://www.webxml.com.cn/webservices/weatherwebservice.asmx/getWeatherbyCityName?theCityName="+cityName;
Toast.makeText(getBaseContext(),cityName,Toast.LENGTH_SHORT).show();
new MyWeather().execute(url_city_data);
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
}
public class MyWeather extends AsyncTask<String,Void,List>{
@Override
protected List doInBackground(String... params) {
list_data = getXml(params[0]);
return list_data;
}
@Override
protected void onPostExecute(List list) {
super.onPostExecute(list);
StringBuilder sb = new StringBuilder();
if (list_data.size()!=0 && list_data!=null){
for (int i=0;i<list_data.size();i++){
String str = list.get(i).toString();
sb.append(str+"\n");
}
show.setText(sb.toString());
}
}
}
//getXml方法，解析获得流，并调用XMLUtil类解析流
public List getXml(String urlString){
List list = null;
InputStream is = null;
HttpURLConnection httpURLConnection = null;
try {
URL url = new URL(urlString);
httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setConnectTimeout(5000);
httpURLConnection.setReadTimeout(5000);
if (httpURLConnection.getResponseCode()==200){
//获取返回的数据流
is = httpURLConnection.getInputStream();
//传入Xml解析工具类进行解析
XMLUtil xmlUtil = new XMLUtil(is);
try {
list = xmlUtil.getAllElement();
} catch (XmlPullParserException e) {
e.printStackTrace();
}
}else {
Toast.makeText(context,"网络异常",Toast.LENGTH_SHORT).show();
return null;
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally {
try {
if (is!=null){
is.close();
}
if (httpURLConnection!=null){
httpURLConnection.disconnect();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return list;
}
}