天气预报app
Posted 星辞归也
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文章目录
一、在Java代码中初始化界面
在MainActivity中初始化ViewPager界面
private void initPager() {
//创建Fragment对象添加到ViewPager数据源当中
for (int i=0;i<cityList.size();i++){ //使用for循环将城市集合中的内容添加到fragment集合中
WeatherFragment weatherFragment = new WeatherFragment();
Bundle bundle = new Bundle();
bundle.putString("city",cityList.get(i)); //使用bundle存储城市名，传到fragment中
weatherFragment.setArguments(bundle);
fragmentList.add(weatherFragment);
}
//将fragment集合传入fragment适配器中
FragmentPagerAdapter fragmentPagerAdapter = new FragmentPagerAdapter(getSupportFragmentManager(),fragmentList);
showVp.setAdapter(fragmentPagerAdapter);
}
在WeatherFragment中获取从MainActivity中传入的城市
//通过activity传值获取到当前fragment加载的是哪个地方的天气情况
Bundle arguments = getArguments();
String city=arguments.getString("city");
getWeatherCity(city);
编写FragmentPagerAdapter用于fragment的显示
public class FragmentPagerAdapter extends FragmentStatePagerAdapter {
List<Fragment> fragmentList; //主界面传入的fragmenr的集合
public FragmentPagerAdapter(FragmentManager fragmentManager,List<Fragment> fragments) {
super(fragmentManager);
this.fragmentList=fragments;
}
@NonNull
@Override
public Fragment getItem(int position) { //根据位置获取集合条目内容
return fragmentList.get(position);
}
@Override
public int getCount() { //获取集合条目个数
return fragmentList.size();
}
}
二、子线程中开启网络请求
编写NetUtil类，在类中编写两个静态方法doGet和getWeatherOfCity
doGet方法用于从网络中获取数据，getWeatherOfCity方法用于拼接url之后，调用doGet方法传入url获取天气信息
public static final String URL_WEATHER="https://tianqiapi.com/api?unescape=1&version=v1&appid=22444194&appsecret=EG7XHDop";
public static String doGet(String urlString){
String result="";
String line;
StringBuilder stringBuilder=null;
BufferedReader bufferedReader=null;
//连接网络
HttpURLConnection connection=null;
InputStreamReader isr=null;
try {
URL url=new URL(urlString);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET"); //链接方式
connection.setConnectTimeout(5000); //超时时间
//从连接中读取数据(二进制)
InputStream inputStream=connection.getInputStream();
//对数据流进行加工
isr=new InputStreamReader(inputStream);
//创建缓冲区，将二进制流送入
bufferedReader=new BufferedReader(isr);
//从缓冲区一行一行读取字符串
stringBuilder=new StringBuilder();
while ((line=bufferedReader.readLine())!=null){
stringBuilder.append(line); //进行拼接
}
result=stringBuilder.toString();
} catch (Exception e) {
e.printStackTrace();
}finally {
try {
//关闭流
connection.disconnect();
bufferedReader.close();
isr.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return result;
}
//拼接出来获取天气的url
public static String getWeatherOfCity(String city){
String url=URL_WEATHER+"&city="+city;
Log.i("Aye","URL:"+url);
Log.i("Aye","URLResult:"+doGet(url));
return doGet(url);
}
编写getWeatherCity方法，开启子线程，调用NetUtil类中的静态方法getWeatherOfCity来获取天气数据，并通过handler将数据传递给主线程
private void getWeatherCity(String selectCity) {
//开启子线程，请求网络
new Thread(new Runnable() {
@Override
public void run() {
//请求网络
String weatherOfCity=NetUtil.getWeatherOfCity(selectCity);
//使用handler将数据传递给主线程
Message message=Message.obtain();
message.what=0;
message.obj=weatherOfCity;
handler.sendMessage(message);
}
}).start();
}
三、网络请求返回Json数据解析
使用在线工具解析Json数据并生成JavaBean导入包中
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-zEJn14mR-1632214033044)(C:\\Users\\paranoia\\AppData\\Roaming\\Typora\\typora-user-images\\image-20210915094807564.png)]
接收子线程传递的数据并使用gson解析
private Handler handler=new Handler(Looper.myLooper()){
@Override
public void handleMessage(@NonNull Message msg) {
super.handleMessage(msg);
if (msg.what==0){
//主线程收到的天气数据
String weather= (String) msg.obj;
Log.i("Aye","主线程收到的天气数据："+weather);
//使用gson解析
Gson gson=new Gson();
JsonRootBean jsonRootBean=gson.fromJson(weather, JsonRootBean.class);
updateWeather(jsonRootBean); //更新天气数据并显示
}
}
};
四、界面呈现
1. 获取天气数据并展示
编写updateWeather方法，用于获取数据并显示在界面上
//数据显示
private void updateWeather(JsonRootBean jsonRootBean) {
if (jsonRootBean!=null){
List<Data> dayWeather = jsonRootBean.getData(); //获取每一天的数据
Data todayWeather = dayWeather.get(0);//获取今天的数据
//不为空则显示今天天气数据
if (todayWeather!=null){
tempTv.setText(todayWeather.getTem1());
mainWeatherTv.setText(todayWeather.getWea());;
todayTv.setText("今天："+todayWeather.getWea());
todayAirTv.setText("空气："+todayWeather.getAir_level());
todayTempTv.setText(todayWeather.getTem()+"~"+todayWeather.getTem2());
todayIconIv.setImageResource(getImg(todayWeather.getWea_img()));
windTv.setText(todayWeather.getWin_speed());
humidityTv.setText(todayWeather.getHumidity());
pressureTv.setText(todayWeather.getPressure()+"hPa");
windTv1.setText(todayWeather.getWin().get(0));
sunriseTv.setText("日出："+todayWeather.getSunrise());
sunsetTv.setText("日落："+todayWeather.getSunset());
}
//获取明天的数据
Data tomorrowWeather = dayWeather.get(1);
//不为空则显示明天数据
if (tomorrowWeather!=null){
tomorrowTv.setText("明天："+tomorrowWeather.getWea());
tomorrowAirTv.setText("空气："+tomorrowWeather.getAir_level());
tomorrowTempTv.setText(tomorrowWeather.getTem()+"~"+tomorrowWeather.getTem2());
tomorrowIconIv.setImageResource(getImg(tomorrowWeather.getWea_img()));
}
//获取后天的数据
Data afterWeather = dayWeather.get(2);
//不为空则显示后天天气数据
if (afterWeather!=null){
afterTv.setText("后天："+afterWeather.getWea());
afterAirTv.setText("空气："+afterWeather.getAir_level());
afterTempTv.setText(afterWeather.getTem()+"~"+afterWeather.getTem2());
afterIconIv.setImageResource(getImg(afterWeather.getWea_img()));
}
//获取指数信息
List<Index> index = todayWeather.getIndex();
//不为空则显示
if (index!=null) {
//紫外线指数
UVTitle = index.get(0).getTitle();
UVLevel = index.get(0).getLevel();
UVDesc = index.get(0).getDesc();
//穿衣指数
clotheTitle = index.get(3).getTitle();
clotheLevel = index.get(3).getLevel();
clotheDesc = index.get(3).getDesc();
//运动指数
sportTitle=index.get(1).getTitle();
sportLevel=index.get(1).getLevel();
sportDesc=index.get(1).getDesc();
//洗车指数
carTitle=index.get(4).getTitle();
carLevel=index.get(4).getLevel();
carDesc=index.get(4).getDesc();
//血糖指数
sickTitle=index.get(2).getTitle();
sickLevel=index.get(2).getLevel();
sickDesc=index.get(2).getDesc();
//空气污染指数
airTitle=index.get(5).getTitle();
airLevel=index.get(5).getLevel();
airDesc=index.get(5).getDesc();
}
//获取逐小时天气情况，传递给Adapter用于显示
List<Hours> timeBean = todayWeather.getHours();
weatherAdapter=new WeatherAdapter(getActivity(),timeBean);
LinearLayoutManager manager=new LinearLayoutManager(getActivity(), RecyclerView.HORIZONTAL,false);
hoursRv.setAdapter(weatherAdapter);
hoursRv.setLayoutManager(manager);
}
}
2. 根据天气情况显示对应图片
编写getImg方法用于根据天气情况显示图片
private int getImg(String wea_img) {
int result = 0;
switch (wea_img) {
case "qing": //晴天
result=R.mipmap.sun;
break;
case "yin": //阴天
result=R.mipmap.yin;
break;
case "yu": //雨天
result=R.mipmap.yu;
break;
case "yun": //多云
result=R.mipmap.yun;
break;
case "bingbao": //冰雹
result=R.mipmap.bingbao;
break;
case "wu": //雾
result=R.mipmap.wu;
break;
case "shachen": //沙尘暴
result=R.mipmap.shachen;
break;
case "lei": //雷
result=R.mipmap.lei;
break;
case "xue": //雪
result=R.mipmap.xue;
break;
default: //如果都不是则显示晴
result=R.mipmap.sun;
break;
}
return result;
}
3. 显示逐小时天气情况
编写WeatherAdapter，用于显示逐小时天气情况
public class WeatherAdapter extends RecyclerView.Adapter<WeatherAdapter.WeatherViewHolder> {
private Context context; //上下文
private List<Hours> timeBean; //天气信息
public WeatherAdapter(Context context, List<Hours> timeBean) {
this.context = context;
this.timeBean = timeBean;
}
@NonNull
@Override //创建ViewHolder
public WeatherViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view= LayoutInflater.from(context).inflate(R.layout.recylerview_item,parent,false);
WeatherViewHolder weatherViewHolder=new WeatherViewHolder(view);
return weatherViewHolder;
}
@Override //绑定ViewHolder，显示数据
public void onBindViewHolder(@NonNull WeatherViewHolder holder, int position) {
Hours hoursBean = timeB以上是关于天气预报app的主要内容，如果未能解决你的问题，请参考以下文章