安卓下如何使用XmlPullParser解析xml檔案並顯示在TextView控制元件上
解析xml檔案有好多種方式，今天介紹下XmlPullParser怎麼解析xml檔案，既然是要解析xml檔案首先得需要一個xml檔案
如下weather.xml檔案
<?xml version="1.0" encoding="utf-8"?>
<weather>
<channel id="1">
<city>北京</city>
<temp>25℃</temp>
<wind>3</wind>
<pm250>300</pm250>
</channel>
<channel id="2">
<city>江西</city>
<temp>30℃</temp>
<wind>4</wind>
<pm250>200</pm250>
</channel>
<channel id="3">
<city>湖北</city>
<temp>30℃</temp>
<wind>2</wind>
<pm250>300</pm250>
</channel>
<channel id="4">
<city>杭州</city>
<temp>30℃</temp>
<wind>4</wind>
<pm250>200</pm250>
</channel>
</weather>
然後有個與之對應的類Channel.java,程式碼如下
package com.example.xmlparser;
/**
* Created by Administrator on 2016-06-21.
*/
public class Channel {
private String id;
private String city;
private String temp;
private String wind;
private String pm250;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getTemp() {
return temp;
}
public void setTemp(String temp) {
this.temp = temp;
}
public String getWind() {
return wind;
}
public void setWind(String wind) {
this.wind = wind;
}
public String getPm250() {
return pm250;
}
public void setPm250(String pm250) {
this.pm250 = pm250;
}
@Override
public String toString() {
return "Channel[id="+id +",city="+ city +",temp="+ temp +"" +
",wind="+ wind +",pm250="+ pm250 +"]";
}
}
然後main_actiity.xml檔案中程式碼如下
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.xmlparser.MainActivity"
tools:showIn="@layout/activity_main">
<TextView
android:id="@+id/tv_weather"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
</RelativeLayout>
然後在Weather.java中解析xml檔案（重點邏輯都在這一段）
package com.example.xmlparser;
import android.util.Xml;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Administrator on 2016-06-21.
*/
public class Weather {
/**
* 伺服器是以流的形式吧資料返回
*/
public static List<Channel> parserXml(InputStream in)throws Exception{
//0.宣告集合物件
List<Channel> weatherLists = null;
Channel channel = null;
//1.獲取xmlpullparser解析例項
XmlPullParser parser = Xml.newPullParser();
//2.設定XmlPullParser的引數
parser.setInput(in,"utf-8");
//3.獲取時間型別
int type = parser.getEventType();
while (type!=XmlPullParser.END_DOCUMENT){
switch (type){
//4.具體判斷下解析到了哪個開始標籤
case XmlPullParser.START_TAG://開始解析標籤
if ("weather".equals(parser.getName())){
//5.建立一個集合物件
weatherLists = new ArrayList<Channel>();
}else if ("channel".equals(parser.getName())){
//6.建立Channel物件
channel = new Channel();
//7.獲取id值
String id = parser.getAttributeName(0);
channel.setId(id);
}else if ("city".equals(parser.getName())){
//9.獲取city值
String city = parser.nextText();
channel.setCity(city);
}else if ("temp".equals(parser.getName())){
//10.獲取temp值
String temp = parser.nextText();
channel.setCity(temp);
} else if ("wind".equals(parser.getName())){
//11.獲取wind值
String wind = parser.nextText();
channel.setCity(wind);
}else if ("pm250".equals(parser.getName())){
//12.獲取pm250值
String pm250 = parser.nextText();
channel.setCity(pm250);
}
break;
case XmlPullParser.END_TAG: //解析結束標誌
//判斷要解析的結束標籤
if ("channel".equals(parser.getName())){
//把javabean物件存到集合中
weatherLists.add(channel);
}
}
//不停的向下解析
type = parser.next();
}
return weatherLists;
}
}
最後是MainActivity.java,程式碼如下
package com.example.xmlparser;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
import java.io.InputStream;
import java.util.List;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
//1.顯示天氣資訊
TextView tv = (TextView) findViewById(R.id.tv_weather);
//1.1獲取資產管理者，通過上下文
InputStream inputStream = getResources().getAssets().open("weather.xml");
//2.呼叫我們定義的解析xml業務方法
List<Channel> weather = Weather.parserXml(inputStream);
StringBuffer sb = new StringBuffer();
for (Channel channel : weather) {
sb.equals(channel.toString());
}
//3.把資料展示到textview上
tv.setText(inputStream.toString());
}catch (Exception e){
e.printStackTrace();
}
}
}
這樣就解析好了