Android 天气预报（XML \ JSON）; [ 导入gson包 ]
源码 [工程文件]：https://gitee.com/lwx001/Weather
weather1.xml【res\raw目录下】 :
raw中的文件会被自动解析、编译。通过raw目录找到相应的文件。
20℃/30℃
晴天多云
上海
80
1级
26℃/32℃
晴天
北京
98
3级
15℃/24℃
多云
广州
30
5级
MainActivity.java :
package cn.lwx.weather;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private TextView tvCity;
private TextView tvWeather;
private TextView tvTemp;
private TextView tvWind;
private TextView tvPm;
private ImageView ivIcon;
private List<Map> list;//存储天气信息的集合
private Map map;
private String temp, weather, name, pm, wind;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//raw中的文件会被自动解析、编译。通过raw目录找到相应的文件
//1、初始化文本控件
initView();
//2、读取解析weather1.xml文件信息 / getResources()得到资源文件
InputStream inputStream = getResources().openRawResource(R.raw.weather1);
try {
//调用工具类[传参：inputStream流]
List weatherInfos = WeatherService.getInfosFromXML(inputStream);
list = new ArrayList<Map>();//存储天气信息的集合
//循环读取weatherInfos中的每一条数据
for (WeatherInfo info : weatherInfos) {
map = new HashMap();
map.put("temp", info.getTemp());
map.put("weather", info.getWeather());
map.put("name", info.getName());
map.put("pm", info.getPm());
map.put("wind", info.getWind());
list.add(map);
}
} catch (Exception e) {
e.printStackTrace();
}
//自定义getMap()方法，显示天气信息到文本控件中，默认显示北京的天气
getMap(1, R.drawable.sun);
}
private void initView() {
tvCity = (TextView) findViewById(R.id.tv_city);
tvWeather = (TextView) findViewById(R.id.tv_weather);
tvTemp = (TextView) findViewById(R.id.tv_temp);
tvWind = (TextView) findViewById(R.id.tv_wind);
tvPm = (TextView) findViewById(R.id.tv_pm);
ivIcon = (ImageView) findViewById(R.id.iv_icon);//展示图片
findViewById(R.id.btn_sh).setOnClickListener(this);//设置点击
findViewById(R.id.btn_bj).setOnClickListener(this);
findViewById(R.id.btn_gz).setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_sh://点击上海
getMap(0, R.drawable.cloud_sun);
break;
case R.id.btn_bj://点击北京
getMap(1, R.drawable.sun);
break;
case R.id.btn_gz://点击广州
getMap(2, R.drawable.clouds);
break;
}
}
//自定义getMap()方法,将城市天气信息分条展示到界面上,默认显示北京天气
private void getMap(int number, int iconNumber) {
Map cityMap = list.get(number);
temp = cityMap.get("temp");
weather = cityMap.get("weather");
name = cityMap.get("name");
pm = cityMap.get("pm");
wind = cityMap.get("wind");
tvCity.setText(name);
tvWeather.setText(weather);
tvTemp.setText("" + temp);
tvWind.setText("风力 : " + wind);
tvPm.setText("pm: " + pm);
ivIcon.setImageResource(iconNumber);
}
}
WeatherInfo.java :
package cn.lwx.weather;
/**
* 创建天气的实体类
*/
public class WeatherInfo {
private String id;
private String temp;
private String weather;
private String name;
private String pm;
private String wind;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTemp() {
return temp;
}
public void setTemp(String temp) {
this.temp = temp;
}
public String getWeather() {
return weather;
}
public void setWeather(String weather) {
this.weather = weather;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPm() {
return pm;
}
public void setPm(String pm) {
this.pm = pm;
}
public String getWind() {
return wind;
}
public void setWind(String wind) {
this.wind = wind;
}
}
WeatherService.java :
package cn.lwx.weather;
import android.util.Xml;
//import com.google.gson.Gson;
//import com.google.gson.reflect.TypeToken;
import org.xmlpull.v1.XmlPullParser;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
/**
* 解析天气的工具类
*/
public class WeatherService {
//解析xml文件返回天气信息的集合 [存储解析信息的集合] 接收InputStream流
public static List getInfosFromXML(InputStream is) throws Exception {
//1、获取pull解析器
XmlPullParser parser = Xml.newPullParser();//工具类
//2、初始化解析器,第一个参数代表包含xml的数据
parser.setInput(is, "utf-8");//流、编码
List weatherInfos = null;
WeatherInfo weatherInfo = null;
//3、得到当前事件的类型
int type = parser.getEventType();
//4、不到文件的结尾,就一直解析。END_DOCUMENT: 文档结束标签
while (type != XmlPullParser.END_DOCUMENT) {
//5、具体判断一下解析的是什么标签（开始标签or结束标签）。
switch (type) {
//一个节点的开始标签
case XmlPullParser.START_TAG://代表 解析 开始标签
//解析到全局开始的标签 infos 根节点
if ("infos".equals(parser.getName())) {//parser.getName(): 拿到当前标签的名字
weatherInfos = new ArrayList();//创建集合对象
} else if ("city".equals(parser.getName())) {
weatherInfo = new WeatherInfo();//初始化weatherInfo的信息
String idStr = parser.getAttributeValue(0);//获取weather1.xml文件中city的id值
weatherInfo.setId(idStr);
} else if ("temp".equals(parser.getName())) {
//parset.nextText()得到该tag节点中的内容
String temp = parser.nextText();
weatherInfo.setTemp(temp);
} else if ("weather".equals(parser.getName())) {
String weather = parser.nextText();
weatherInfo.setWeather(weather);
} else if ("name".equals(parser.getName())) {
String name = parser.nextText();
weatherInfo.setName(name);
} else if ("pm".equals(parser.getName())) {
String pm = parser.nextText();
weatherInfo.setPm(pm);
} else if ("wind".equals(parser.getName())) {
String wind = parser.nextText();
weatherInfo.setWind(wind);
}
break;
//一个节点结束的标签
case XmlPullParser.END_TAG:
//一个城市的信息处理完毕，city的结束标签
if ("city".equals(parser.getName())) {
weatherInfos.add(weatherInfo);//把bean对象加到集合中
weatherInfo = null;
}
break;
}
type = parser.next();//赋值：解析后的事件类型
}
return weatherInfos;
}
// //解析json文件返回天气信息的集合
// public static List getInfosFromJson(InputStream is)
// throws IOException {
// byte[] buffer = new byte[is.available()];
// is.read(buffer);
// String json = new String(buffer, "utf-8");
// //使用gson库解析JSON数据
// Gson gson = new Gson();
// Type listType = new TypeToken<List>() {
// }.getType();
// List weatherInfos = gson.fromJson(json, listType);
// return weatherInfos;
// }
}
JSON :
添加库文件 （ json ）：
若添加gson包失败，可更改build.gradle文件，然后重启项目：
build.gradle ：
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
maven{url 'http://maven.aliyun.com/nexus/content/groups/public/'}
maven { url "https://jitpack.io" }
google()
//jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.6.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
maven{url 'http://maven.aliyun.com/nexus/content/groups/public/'}
maven { url "https://jitpack.io" }
google()
//jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
weather2.json :
[
{"temp":"20℃/30℃","weather":"晴转多云","name":"上海","pm":"80","wind":"1级"},
{"temp":"15℃/24℃","weather":"晴","name":"北京","pm":"98","wind":"3级"},
{"temp":"26℃/32℃","weather":"多云","name":"广州","pm":"30","wind":"2级"}
]
更改 MainActivity.java 文件 ：
作者：玉山水
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