Github最火开源项目-RxjavaUtil

作者: 小怪兽打葫芦娃 | 来源:发表于2017-03-06 21:30 被阅读294次

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Rxjava快速封装实现的示例工程,包括变换的使用以及与Retrofit联用

开源项目地址:https://github.com/open-android/RxjavaUtils

  • 配套视频

  • 开始在build.gradle添加依赖

       compile 'io.reactivex:rxjava:1.0.9'
       compile 'io.reactivex:rxandroid:0.24.0'
       compile 'com.squareup.retrofit:retrofit:1.9.0'
    
  • 需要的权限

      <uses-permission android:name="android.permission.INTERNET" />
  • 使用RxjavaUtil请求数据时需要和Retrofit连用,第一步就是使用Retrofit定义所有功能接口的API服务类,以天气接口为例。,

接口地址:http://api.openweathermap.org/data/2.5/weather?q=shenzhen&mode=json&APPID=6c113432fd84a6e28268af291821db16

  • 参数声明,Url都通过Annotation指定,接口定义如下:

      private interface AppApi {
          @GET("/weather")
          WeatherData getWeather(@Query("q") String city, @Query("mode") String mode, @Query("APPID") String APPID);
      }
    
  • 返回数据如下,可以使用GsonFormat自动生成javabean(即WeatherData):

    {"coord":{"lon":114.07,"lat":22.55},"weather":[{"id":800,"main":"Clear","description":"clear sky","icon":"01n"}],"base":"stations","main":{"temp":293.15,"pressure":1018,"humidity":72,"temp_min":293.15,"temp_max":293.15},"visibility":10000,"wind":{"speed":3.69,"deg":116.004},"clouds":{"all":0},"dt":1483538400,"sys":{"type":1,"id":7420,"message":0.0134,"country":"CN","sunrise":1483484686,"sunset":1483523588},"id":1795565,"name":"Shenzhen","cod":200}
  • 第二步是通过RestAdapter生成API接口服务的实现类(动态代理)
    private static final RestAdapter restAdapter = new RestAdapter.Builder().setEndpoint(ENDPOINT).setLogLevel(RestAdapter.LogLevel.FULL).build();
    private static final AppApi appService = restAdapter.create(AppApi.class);
  • 第三步是关键的一步,将返回的数据类型包装到一个数据源(Observable)中。
    onNext是RxJava发送事件,即开始请求数据,onCompleted为结束任务的事件,subscribeOn为指定获取数据的线程为耗时线程。
    public static Observable<WeatherData> getWeatherData(final String city) {
    return Observable.create(new Observable.OnSubscribe<WeatherData>() {
        @Override
        public void call(Subscriber<? super WeatherData> subscriber) {
            subscriber.onNext(appService.getWeather(city,"json", "6c113432fd84a6e28268af291821db16"));
            subscriber.onCompleted();
        }
    }).subscribeOn(Schedulers.io());
}
  • 最后调用封装好的方法就可以了,拿到数据后,在主线程中回调(subscribeOn(Schedulers.io()),获取单个天气示例如下:

      RxJavaUtil.getWeatherData(cityName).subscribeOn(Schedulers.io())
              .observeOn(AndroidSchedulers.mainThread())
              .subscribe(new Action1<WeatherData>() {
                  @Override
                  public void call(WeatherData weatherData) {
                      Log.d(LOG_TAG, weatherData.toString());
                      switch (cityName){
                          case "beijing":
                              mTv1.setText(weatherData.toString());
                              break;
                          case "shenzhen":
                              mTv2.setText(weatherData.toString());
                              break;
                          case "shanghai":
                              mTv3.setText(weatherData.toString());
                              break;
                      }
                  }
              }, new Action1<Throwable>() {
                  @Override
                  public void call(Throwable throwable) {
                      Log.e(LOG_TAG, throwable.getMessage(), throwable);
                  }
              });
    
  • 当获取多个天气时候,要使用到Rxjava的变换,简单点理解,就是一个数据源变成多个数据源,一对多的映射关系。

      Observable.from(cities).flatMap(new Func1<String, Observable<WeatherData>>() {
          @Override
          public Observable<WeatherData> call(String city) {
              return RxJavaUtil.getWeatherData(city);
          }
      }).subscribeOn(Schedulers.io())
              .observeOn(AndroidSchedulers.mainThread())
              .subscribe(/*onNext*/new Action1<WeatherData>() {
                  @Override
                  public void call(WeatherData weatherData) {
                      String  cityName = weatherData.name.toLowerCase();
                      switch (cityName){
                          case "beijing":
                              mTv1.setText(weatherData.toString());
                              break;
                          case "shenzhen":
                              mTv2.setText(weatherData.toString());
                              break;
                          case "shanghai":
                              mTv3.setText(weatherData.toString());
                              break;
                      }
                  }
              }, /*onError*/new Action1<Throwable>() {
                  @Override
                  public void call(Throwable throwable) {
    
                  }
              });}
    

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