保存文件到手机内存

一 UI Code

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

<TextView
        android:id="@+id/tv_weather"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
       />
</RelativeLayout>

二 Logical Code

<?xml version=‘1.0‘ encoding=‘utf-8‘ standalone=‘yes‘ ?>
<weather>
    <day id="1">
        <wendu>18</wendu>
        <wind>5</wind>
        <type>晴</type>
    </day>
    <day id="2">
        <wendu>16</wendu>
        <wind>3</wind>
        <type>雨</type>
    </day>
    <day id="3">
        <wendu>19</wendu>
        <wind>4</wind>
        <type>阴</type>
    </day>
</weather>

package com.itheima.weather.service;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import android.util.Xml;

import com.itheima.weather.domain.Weather;

public class WeatherService {
    /**
     * 解析获取天气信息
     * 天气信息xml文件对应的流
     * @throws Exception
     */
    public static List<Weather> getWeather(InputStream is) throws Exception {
        // 解析 天气的xml文件.
        // 1.获取到一个xml文件的解析器.
        XmlPullParser parser = Xml.newPullParser();
        // 2.初始化解析器.
        parser.setInput(is, "utf-8");
        // 3.解析xml文件.
        // 得到当前解析条目的节点类型.
        int eventType = parser.getEventType(); // 第一次被调用的时候 定位在xml开头
        List<Weather> weatherInfos = null;
        Weather weatherInfo = null;
        while (eventType != XmlPullParser.END_DOCUMENT) {// 需要不停的让 解析器解析下一个节点
            switch (eventType) {
            case XmlPullParser.START_TAG:
                if ("weather".equals(parser.getName())) {
                    // 发现开始节点 为weather 创建集合
                    weatherInfos = new ArrayList<Weather>();
                } else if ("day".equals(parser.getName())) {
                    // 发现一个新的日期 对应的天气
                    weatherInfo = new Weather();
                    String id = parser.getAttributeValue(0);
                    weatherInfo.setId(Integer.parseInt(id));
                } else if ("wendu".equals(parser.getName())) {
                    String wendu = parser.nextText();
                    weatherInfo.setWendu(Integer.parseInt(wendu));
                } else if ("wind".equals(parser.getName())) {
                    String wind = parser.nextText();
                    weatherInfo.setWind(Integer.parseInt(wind));
                } else if ("type".equals(parser.getName())) {
                    String type = parser.nextText();
                    weatherInfo.setType(type);
                }
                break;
            case XmlPullParser.END_TAG:
                if ("day".equals(parser.getName())) {
                    weatherInfos.add(weatherInfo);
                    weatherInfo=null;
                }
                break;
            }
            eventType = parser.next();// 控制解析器 解析下一个节点
        }
        is.close();
        return weatherInfos;
    }
}

package com.itheima.weather.domain;

public class Weather {
    private int wendu;
    private int wind;
    private String type;
    private int id;
    public int getWendu() {
        return wendu;
    }
    public void setWendu(int wendu) {
        this.wendu = wendu;
    }
    public int getWind() {
        return wind;
    }
    public void setWind(int wind) {
        this.wind = wind;
    }
    public String getType() {
        return type;
    }
    public void setType(String type) {
        this.type = type;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Override
    public String toString() {
        return "天气信息 [温度=" + wendu + ", 风力=" + wind + "级 , 天气状况=" + type
                + ", 未来第=" + id + "天]";
    }
}

package com.itheima.weather;

import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import com.itheima.weather.domain.Weather;
import com.itheima.weather.service.WeatherService;

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_weather);
        try {
            StringBuilder sb = new StringBuilder();
            List<Weather> weatherinfos = WeatherService.getWeather(getClassLoader().getResourceAsStream("weather.xml"));
            for(Weather weather : weatherinfos){
                sb.append(weather.toString());
                sb.append("\n");
            }
            tv.setText(sb.toString());
        } catch (Exception e) {
            e.printStackTrace();
            Toast.makeText(this, "解析天气信息失败", 0).show();
        }
    }
}