[android] 天气app布局练习（四）详解手机开发

package com.example.weatherreport; 
import java.io.UnsupportedEncodingException; 
import java.net.URLEncoder; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import android.app.Activity; 
import android.os.Bundle; 
import android.widget.GridView; 
import android.widget.SimpleAdapter; 
import android.widget.TextView; 
import com.example.weatherreport.contants.ApiContants; 
import com.example.weatherreport.domain.Weather; 
import com.example.weatherreport.net.HttpListener; 
import com.example.weatherreport.net.HttpUtil; 
public class MainActivity extends Activity { 
private GridView gv_airs; 
private TextView tv_city; 
private TextView tv_number; 
private TextView tv_rain; 
private TextView tv_cloth; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
gv_airs = (GridView) findViewById(R.id.gv_airs); 
tv_city=(TextView) findViewById(R.id.tv_city); 
tv_number=(TextView) findViewById(R.id.tv_number); 
tv_rain=(TextView) findViewById(R.id.tv_rain); 
tv_cloth=(TextView) findViewById(R.id.tv_cloth); 
setViewData(); 
makeGridView(); 
} 
/** 
* 设置界面数据 
*/ 
private void setViewData() { 
String city = null; 
try { 
city = URLEncoder.encode("北京", "gb2312"); 
} catch (UnsupportedEncodingException e) { 
e.printStackTrace(); 
} 
HttpUtil.get(ApiContants.WEATHER_URL+"?city="+city+"&password=DJOYnieT8234jlsK&day=0", new HttpListener() { 
@Override 
public void onSuccess(String result) { 
Weather weather=(Weather) HttpUtil.xml2object(result); 
setViewWeather(weather); 
} 
@Override 
public void onError(String result) { 
System.out.println(result); 
} 
}); 
} 
protected void setViewWeather(Weather weather) { 
tv_city.setText(weather.getCity()); 
tv_number.setText(weather.getHot()); 
tv_rain.setText(weather.getRain()); 
tv_cloth.setText(weather.getCloth()); 
System.out.println(weather.toString()); 
} 
/** 
* 组装GridView 
*/ 
private void makeGridView() { 
List<Map<String, String>> data = new ArrayList<>(); 
Map<String, String> item = null; 
item = new HashMap<>(); 
item.put("title", "83"); 
item.put("desc", "湿度(%)"); 
data.add(item); 
item = new HashMap<>(); 
item.put("title", "11.3"); 
item.put("desc", "可见度(km)"); 
data.add(item); 
item = new HashMap<>(); 
item.put("title", "2级"); 
item.put("desc", "东南风"); 
data.add(item); 
item = new HashMap<>(); 
item.put("title", "最弱"); 
item.put("desc", "紫外线"); 
data.add(item); 
item = new HashMap<>(); 
item.put("title", "1005.5"); 
item.put("desc", "气压(mb)"); 
data.add(item); 
item = new HashMap<>(); 
item.put("title", "22.4"); 
item.put("desc", "体感"); 
data.add(item); 
SimpleAdapter adapter = new SimpleAdapter(this, data, 
R.layout.main_grid_item, new String[] { "title", "desc" }, 
new int[] { R.id.tv_title, R.id.tv_desc }); 
gv_airs.setAdapter(adapter); 
} 
}

package com.example.weatherreport.net; 
import java.io.ByteArrayOutputStream; 
import java.io.InputStream; 
import java.io.StringReader; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import org.xmlpull.v1.XmlPullParser; 
import android.os.Handler; 
import android.os.Message; 
import android.util.Xml; 
import com.example.weatherreport.domain.Weather; 
public class HttpUtil { 
public static final int SUCCESS = 1; 
public static final int ERROR = 2; 
/** 
* 获取get数据 
*  
* @param apiUrl 
*/ 
public static void get(final String apiUrl, final HttpListener listener) { 
final Handler handler = new HttpHandler(listener); 
new Thread(new Runnable() { 
@Override 
public void run() { 
Message msg = new Message(); 
try { 
URL url = new URL(apiUrl); 
HttpURLConnection conn = (HttpURLConnection) url 
.openConnection(); 
conn.setRequestMethod("GET"); 
conn.setConnectTimeout(5000); 
int code = conn.getResponseCode(); 
if (code == 200) { 
InputStream is = conn.getInputStream(); 
String result = readInputStream(is); 
msg.what = SUCCESS; 
msg.obj = result; 
handler.sendMessage(msg); 
} else { 
listener.onError(String.valueOf(code)); 
} 
} catch (Exception e) { 
e.printStackTrace(); 
msg.what = ERROR; 
msg.obj = "网络异常"; 
handler.sendMessage(msg); 
} 
} 
}).start(); 
} 
/** 
* 读取输入流 
*  
* @param is 
* @return 
*/ 
public static String readInputStream(InputStream is) { 
ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
int len = 0; 
byte[] buffer = new byte[1024]; 
try { 
while ((len = is.read(buffer)) != -1) { 
baos.write(buffer, 0, len); 
} 
is.close(); 
byte[] res = baos.toByteArray(); 
return new String(res); 
} catch (Exception e) { 
e.printStackTrace(); 
} 
return null; 
} 
/** 
* 解析xml 
*  
* @return 
*/ 
public static Object xml2object(String xmlString) { 
Weather weather = new Weather(); 
try { 
XmlPullParser pullParser = Xml.newPullParser(); 
pullParser.setInput(new StringReader(xmlString)); 
int event = pullParser.getEventType(); 
while (event != XmlPullParser.END_DOCUMENT) { 
switch (event) { 
case XmlPullParser.START_TAG: 
String tagName = pullParser.getName(); 
if (tagName.equals("Weather") || tagName.equals("Profiles")) { 
} else { 
String tagValue = pullParser.nextText(); 
System.out.println(tagName + ":" + tagValue); 
if (tagName.equals("status1")) { 
weather.setRain(tagValue); 
} 
if (tagName.equals("tgd1")) { 
weather.setHot(tagValue); 
} 
if (tagName.equals("chy_l")) { 
weather.setCloth(tagValue); 
} 
if (tagName.equals("city")) { 
weather.setCity(tagValue); 
} 
} 
break; 
case XmlPullParser.END_TAG: 
default: 
break; 
} 
event = pullParser.next(); 
} 
} catch (Exception e) { 
e.printStackTrace(); 
} 
return weather; 
} 
} 
/** 
*  
* 位于主线程的Handler 
* @author taoshihan 
* 
*/ 
class HttpHandler extends Handler { 
private HttpListener listener; 
public HttpHandler(HttpListener listener) { 
this.listener=listener; 
} 
@Override 
public void handleMessage(Message msg) { 
int flag=msg.what; 
String res=(String)msg.obj; 
if (flag==HttpUtil.SUCCESS) { 
listener.onSuccess(res); 
}else{ 
listener.onError(res); 
} 
} 
}

package com.example.weatherreport.net; 
public interface HttpListener { 
public void onSuccess(String result); 
public void onError(String result); 
}