使用序列化器生成一个xml文件
//1,初始化一个xml文件的序列化器
XmlSerializer serializer = Xml.newSerializer();
//2.初始化序列器参数
File file = new File(Environment.getExternalStorageDirectory(),"backup.xml");
FileOutputStream fos = new FileOutputStream(file);
serializer.setOutput(fos, "UTF-8");
//3.开始写xml文件.
serializer.startDocument("UTF-8", true);
serializer.startTag(null, "smss");
for(SmsInfo info : smsInfos){
//开始写sms节点
serializer.startTag(null, "sms");
//开始写body节点
serializer.startTag(null, "body");
serializer.text(info.getBody());
//body节点结束
serializer.endTag(null, "body");
//开始写address节点
serializer.startTag(null, "address");
serializer.text(info.getAddress());
serializer.endTag(null, "address");
//开始写data节点
serializer.startTag(null, "date");
serializer.text(info.getDate()+"");
serializer.endTag(null, "date");
// sms节点结束
serializer.endTag(null, "sms");
}
//smss根节点结束
serializer.endTag(null, "smss");
//xml 结束
serializer.endDocument();
fos.close();
Toast.makeText(this, "备份短信成功", 0).show();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(this, "备份短信失败", 0).show();
}
#12.使用pull解析xml格式的数据 (重要)
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 设置activity显示的布局
setContentView(R.layout.activity_main);
TextView tv_info = (TextView) findViewById(R.id.tv_info);
StringBuilder sb = new StringBuilder();
try {
//获取我们解析出来的天气信息
List<Channel> channels = WeatherService.getAllWeatherInfos(getClass().getClassLoader().getResourceAsStream("weather.xml"));
for(Channel channel : channels){
sb.append(channel.toString());
sb.append("\n");
}
//把解析出来的天气信息设置到textview上
tv_info.setText(sb.toString());
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(this, "解析天气信息失败", 0).show();
}
}
}
---------------------------------------------------------------
public class WeatherService {
/**
* 解析服务器返回的数据 获取天气信息
* @param is 服务器返回的包含天气信息的流 (xml)
* @return
*/
public static List<Channel> getAllWeatherInfos(InputStream is) throws Exception{
List<Channel> channels = null;
Channel channel = null;
//1.获取xml解析器
XmlPullParser parser = Xml.newPullParser();
//2.设置xml解析器的参数
parser.setInput(is, "utf-8");
//3.开始解析xml文件.
int type = parser.getEventType();// 获取当前的事件的类型
while (type!=XmlPullParser.END_DOCUMENT){ //需要让pull解析器解析到文件的末尾
switch (type) {
case XmlPullParser.START_TAG:
if("weather".equals(parser.getName())){//总的开始节点
channels = new ArrayList<Channel>(); //初始化集合
}else if("channel".equals(parser.getName())){//某个城市的信息开始了.
channel = new Channel();
//获取到id的属性值
String id = parser.getAttributeValue(0);
channel.setId(Integer.parseInt(id));
//解析city节点
}else if("city".equals(parser.getName())){
String city = parser.nextText();
channel.setCity(city);
//解析温度节点
}else if("temp".equals(parser.getName())){
String temp = parser.nextText();
channel.setTemp(temp);
//解析风力节点
}else if("wind".equals(parser.getName())){
String wind = parser.nextText();
channel.setWind(wind);
//解析pm250节点
}else if("pm250".equals(parser.getName())){
String pm250 = parser.nextText();
channel.setPm250(Integer.parseInt(pm250));
}
break;
//判断xml的结束节点
case XmlPullParser.END_TAG:
if("channel".equals(parser.getName())){
//把解析的内容加入到集合中
channels.add(channel);
channel = null;
}
break;
}
type = parser.next();
}
is.close();
return channels;//把所有的频道的集合返回回去
}
}