更新今日天气数据
资源文件: 下载地址
主要步骤
1. 初始化界面控件
定义相关的控件对象
private TextView cityTv, timeTv, humidityTv, weekTv, pmDataTv, pmQualityTv,
temperatureTv, climateTv, windTv, city_name_Tv;
private ImageView weatherImg, pmImg;
初始化控件内容
void initView(){
city_name_Tv = (TextView) findViewById(R.id.title_city_name);
cityTv = (TextView) findViewById(R.id.city);
timeTv = (TextView) findViewById(R.id.time);
humidityTv = (TextView) findViewById(R.id.humidity);
weekTv = (TextView) findViewById(R.id.week_today);
pmDataTv = (TextView) findViewById(R.id.pm_data);
pmQualityTv = (TextView) findViewById(R.id.pm2_5_quality);
pmImg = (ImageView) findViewById(R.id.pm2_5_img);
temperatureTv = (TextView) findViewById(R.id.temperature);
climateTv = (TextView) findViewById(R.id.climate);
windTv = (TextView) findViewById(R.id.wind);
weatherImg = (ImageView) findViewById(R.id.weather_img);
city_name_Tv.setText("N/A");
cityTv.setText("N/A");
timeTv.setText("N/A");
humidityTv.setText("N/A");
pmDataTv.setText("N/A");
pmQualityTv.setText("N/A");
weekTv.setText("N/A");
temperatureTv.setText("N/A");
climateTv.setText("N/A");
windTv.setText("N/A");
}
在onCreate方法中调用initView函数。
程序运行结果如下
2.建立 TodayWeather Bean
新建TodayWeather类
private String city;
private String updatetime;
private String wendu;
private String shidu;
private String pm25;
private String quality;
private String fengxiang;
private String fengli;
private String date;
private String high;
private String low;
private String type;
通过工具提供的功能生成get、set、toString方法。
......
3.将解析的数据存入TodayWeather对象中
修改解析函数
private TodayWeather parseXML(String xmldata){
TodayWeather todayWeather = null;
int fengxiangCount=0;
int fengliCount =0;
int dateCount=0;
int highCount =0;
int lowCount=0;
int typeCount =0;
try {
XmlPullParserFactory fac = XmlPullParserFactory.newInstance();
XmlPullParser xmlPullParser = fac.newPullParser();
xmlPullParser.setInput(new StringReader(xmldata));
int eventType = xmlPullParser.getEventType();
Log.d("myWeather", "parseXML");
while (eventType != XmlPullParser.END_DOCUMENT) {
switch (eventType) {
// 判断当前事件是否为文档开始事件
case XmlPullParser.START_DOCUMENT:
break;
// 判断当前事件是否为标签元素开始事件
case XmlPullParser.START_TAG:
if(xmlPullParser.getName().equals("resp")){
todayWeather= new TodayWeather();
}
if (todayWeather != null) {
if (xmlPullParser.getName().equals("city")) {
eventType = xmlPullParser.next();
todayWeather.setCity(xmlPullParser.getText());
} else if (xmlPullParser.getName().equals("updatetime")) {
eventType = xmlPullParser.next();
todayWeather.setUpdatetime(xmlPullParser.getText());
} else if (xmlPullParser.getName().equals("shidu")) {
eventType = xmlPullParser.next();
todayWeather.setShidu(xmlPullParser.getText());
} else if (xmlPullParser.getName().equals("wendu")) {
eventType = xmlPullParser.next();
todayWeather.setWendu(xmlPullParser.getText());
} else if (xmlPullParser.getName().equals("pm25")) {
eventType = xmlPullParser.next();
todayWeather.setPm25(xmlPullParser.getText());
} else if (xmlPullParser.getName().equals("quality")) {
eventType = xmlPullParser.next();
todayWeather.setQuality(xmlPullParser.getText());
} else if (xmlPullParser.getName().equals("fengxiang") && fengxiangCount == 0) {
eventType = xmlPullParser.next();
todayWeather.setFengxiang(xmlPullParser.getText());
fengxiangCount++;
} else if (xmlPullParser.getName().equals("fengli") && fengliCount == 0) {
eventType = xmlPullParser.next();
todayWeather.setFengli(xmlPullParser.getText());
fengliCount++;
} else if (xmlPullParser.getName().equals("date") && dateCount == 0) {
eventType = xmlPullParser.next();
todayWeather.setDate(xmlPullParser.getText());
dateCount++;
} else if (xmlPullParser.getName().equals("high") && highCount == 0) {
eventType = xmlPullParser.next();
todayWeather.setHigh(xmlPullParser.getText().substring(2).trim());
highCount++;
} else if (xmlPullParser.getName().equals("low") && lowCount == 0) {
eventType = xmlPullParser.next();
todayWeather.setLow(xmlPullParser.getText().substring(2).trim());
lowCount++;
} else if (xmlPullParser.getName().equals("type") && typeCount == 0) {
eventType = xmlPullParser.next();
todayWeather.setType(xmlPullParser.getText());
typeCount++;
}
}
break;
// 判断当前事件是否为标签元素结束事件
case XmlPullParser.END_TAG:
break;
}
// 进入下一个元素并触发相应事件
eventType = xmlPullParser.next();
}
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return todayWeather;
}
调用parseXML，并返回TodayWeather对象。
TodayWeather todayWeather = null;
todayWeather = parseXML(responseStr);
if (todayWeather != null) {
Log.d("myWeather", todayWeather.toString());
}
运行结果如下：
4.利用TodayWeather对象更新UI中的控件
编写 updateTodayWeather 函数。
void updateTodayWeather(TodayWeather todayWeather){
city_name_Tv.setText(todayWeather.getCity()+"天气");
cityTv.setText(todayWeather.getCity());
timeTv.setText(todayWeather.getUpdatetime()+ "发布");
humidityTv.setText("湿度："+todayWeather.getShidu());
pmDataTv.setText(todayWeather.getPm25());
pmQualityTv.setText(todayWeather.getQuality());
weekTv.setText(todayWeather.getDate());
temperatureTv.setText(todayWeather.getHigh()+"~"+todayWeather.getLow());
climateTv.setText(todayWeather.getType());
windTv.setText("风力:"+todayWeather.getFengli());
Toast.makeText(MainActivity.this,"更新成功！",Toast.LENGTH_SHORT).show();
}
通过消息机制，将解析的天气对象，通过消息发送给主线程，主线程接收到消息数据后，调用updateTodayWeather函数，更新UI界面上的数据。
private static final int UPDATE_TODAY_WEATHER = 1;
private Handler mHandler = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case UPDATE_TODAY_WEATHER:
updateTodayWeather((TodayWeather) msg.obj);
break;
default:
break;
}
}
};
Message msg =new Message();
msg.what = UPDATE_TODAY_WEATHER;
msg.obj=todayWeather;
mHandler.sendMessage(msg);
程序运行结果：
单击更新后，界面如下：
备注：
- 兰州城市代码为：101160101
- 关于如何更新ImageView，请大家尝试自行完成，相应的图片资源文件已经提供。