編輯:關於android開發
主要練習一下獲取網絡數據和解析xml
MainActivity.java
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(); } /** * 設置界面數據 */ 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()); } /** * 組裝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", "濕度(%)"); data.add(item); item = new HashMap<>(); item.put("title", "11.3"); item.put("desc", "可見度(km)"); data.add(item); item = new HashMap<>(); item.put("title", "2級"); item.put("desc", "東南風"); data.add(item); item = new HashMap<>(); item.put("title", "最弱"); item.put("desc", "紫外線"); data.add(item); item = new HashMap<>(); item.put("title", "1005.5"); item.put("desc", "氣壓(mb)"); data.add(item); item = new HashMap<>(); item.put("title", "22.4"); item.put("desc", "體感"); 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); } }
HttpUtil.java
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; /** * 獲取get數據 * * @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 = "網絡異常"; handler.sendMessage(msg); } } }).start(); } /** * 讀取輸入流 * * @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; } } /** * * 位於主線程的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); } } }
HttpListener.java
package com.example.weatherreport.net; public interface HttpListener { public void onSuccess(String result); public void onError(String result); }
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