Android 中使用Pull解析XML檔案
阿新 • • 發佈:2019-01-31
解析XML檔案是非常常用的功能,在Android客戶端中,經常與伺服器通訊都需要xml檔案的支援,我們這裡介紹一個
簡單的xml檔案的解析,就是使用android中的pull方法進行解析。在java中,有dom解析和sax解析,這個pull解析有些類
似於sax解析,他也是一行一行的讀取然後解析內容的方法.
首先看一下這個簡單的xml檔案
<?xml version="1.0" encoding="utf-8"?> <infos> <city id="1"> <temp>-1℃/5℃</temp> <weather>多雲</weather> <wind>南風3-4級</wind> <name>上海</name> <pm>200</pm> </city> <city id="2"> <temp>-1℃/5℃</temp> <weather>多雲</weather> <wind>南風3-4級</wind> <name>北京7-8</name> <pm>800</pm> </city> <city id="3"> <temp>-7℃/5℃</temp> <weather>多雲</weather> <wind>南風3-4級</wind> <name>哈爾濱</name> <pm>100</pm> </city> </infos>
然後我們直接解析這個xml檔案,在textview中顯示一下
這裡是程式碼,首先是業務Bean
package com.bird.weather; public class WeatherBean { private int id; private String name; private String wind; private String weather; private String temp; private String pm; @Override public String toString() { return "WeatherBean [id=" + id + ", name=" + name + ", wind=" + wind + ", weather=" + weather + ", temp=" + temp + ", pm=" + pm + "]"; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getWind() { return wind; } public void setWind(String wind) { this.wind = wind; } public String getWeather() { return weather; } public void setWeather(String weather) { this.weather = weather; } public String getTemp() { return temp; } public void setTemp(String temp) { this.temp = temp; } public String getPm() { return pm; } public void setPm(String pm) { this.pm = pm; } }
然後是解析xml檔案的主要程式碼
package com.bird.weather; import java.io.InputStream; import java.util.ArrayList; import java.util.List; import org.xmlpull.v1.XmlPullParser; import android.util.Xml; public class ParseXml { public static List<WeatherBean> parse(InputStream is) { List<WeatherBean> list = null; WeatherBean bean = null; try { XmlPullParser parser = Xml.newPullParser(); // 初始化解析器 parser.setInput(is, "utf-8"); int type = parser.next(); while (type != XmlPullParser.END_DOCUMENT) { switch (type) { case XmlPullParser.START_TAG: if ("infos".equals(parser.getName())) { list = new ArrayList<WeatherBean>(); } else if ("city".equals(parser.getName())) { bean = new WeatherBean(); bean.setId(Integer.valueOf(parser.getAttributeValue(0))); } else if ("temp".equals(parser.getName())) { String temp = parser.nextText(); bean.setTemp(temp); } else if ("weather".equals(parser.getName())) { String weather = parser.nextText(); bean.setWeather(weather); } else if ("wind".equals(parser.getName())) { String wind = parser.nextText(); bean.setWind(wind); } else if ("name".equals(parser.getName())) { String name = parser.nextText(); bean.setName(name); } else if ("pm".equals(parser.getName())) { String pm = parser.nextText(); bean.setPm(pm); } break; case XmlPullParser.END_TAG: if ("city".equals(parser.getName())) { // 一個城市的資訊處理完畢 list.add(bean); bean = null; } break; } type = parser.next(); } } catch (Exception e) { e.printStackTrace(); } return list; } }
最後在mainactivity中使用這個程式碼,使用類載入器完成這個簡單的功能
package com.bird.weather;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.widget.TextView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView tv = (TextView) findViewById(R.id.tv);
List<WeatherBean> list = ParseXml.parse(MainActivity.class.getClassLoader().getResourceAsStream("test.xml"));
StringBuffer sb = new StringBuffer();
for(WeatherBean bean : list){
String str = bean.toString();
sb.append(str);
sb.append("\n");
}
tv.setText(sb.toString());
}
}
這樣看來,解析xml檔案還是非常簡單的