Android基础--XML序列化(XmlSerializer)
1.封装节点的JavaBean
public class City { private String name; private String temp; private String pm25; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getTemp() { return temp; } public void setTemp(String temp) { this.temp = temp; } public String getPm25() { return pm25; } public void setPm25(String pm25) { this.pm25 = pm25; } @Override public String toString() { return "City [name=" + name + ", temp=" + temp + ", pm25=" + pm25 + "]"; } public City(String name, String temp, String pm25) { super(); this.name = name; this.temp = temp; this.pm25 = pm25; } public City() { super(); } }
2.生成xml的MainActivity.java ,其中createXmlFile是绑定在一个Button控件上的点击事件
package com.itheima.xmlserializer; import java.io.File; import java.io.FileOutputStream; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; import org.xmlpull.v1.XmlSerializer; import android.app.Activity; import android.os.Bundle; import android.os.Environment; import android.util.Xml; import android.view.View; import com.itheima.xmlserializer.domain.City; public class MainActivity extends Activity { List<City> cityList; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); cityList = new ArrayList<City>(); City city = null; for (int i = 0; i < 5; i++) { city = new City("城市" + i, 20 + i + "", 100 + i + ""); cityList.add(city); } } public void createXmlFile(View v) { // 判断当前SD卡是否可用 if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { // 指定存放xml文件的位置 File file = new File(Environment.getExternalStorageDirectory(), "info.xml"); // 获得XML序列化器 XmlSerializer xs = Xml.newSerializer(); OutputStream os = null; try { //OutputStream :指定文件的保存路径 //encoding:指定生成的xml文件的编码 os = new FileOutputStream(file); xs.setOutput(os, "UTF-8"); // 开始生成文件 // 设置xml文件第一行<?xml encoding = ? standalone=?> xs.startDocument("UTF-8", true); //生成根节点开始标签 xs.startTag(null, "weather"); for (City city : cityList) { xs.startTag(null, "city"); xs.startTag(null, "name"); //生成文本节点 xs.text(city.getName()); xs.endTag(null, "name"); xs.startTag(null, "temp"); //生成文本节点 xs.text(city.getTemp()); xs.endTag(null, "temp"); xs.startTag(null, "pm25"); //生成文本节点 xs.text(city.getPm25()); xs.endTag(null, "pm25"); xs.endTag(null, "city"); } //生成根节点结束标签 xs.endTag(null, "weather"); xs.endDocument(); } catch (Exception e) { throw new RuntimeException(e); } } } }
3.生成的XML文件如下,因为没有换行,所有可读性差一些
<?xml version=‘1.0‘ encoding=‘UTF-8‘ standalone=‘yes‘ ?><weather><city><name>城市0</name><temp>20</temp><pm25>100</pm25></city><city><name>城市1</name><temp>21</temp><pm25>101</pm25></city><city><name>城市2</name><temp>22</temp><pm25>102</pm25></city><city><name>城市3</name><temp>23</temp><pm25>103</pm25></city><city><name>城市4</name><temp>24</temp><pm25>104</pm25></city></weather>
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