java服务器发送事件如何在Android中处理
我已经创建了一个应用程序(遵循当前使用LiveData和改进的Android MVVM架构)。该应用程序用作照明和进入系统的遥控器
我构建了一个Repository类,该类使用对RESTAPI进行调用的改装来实现网络后端。当我手动请求(使用GET)状态更新时,我可以获取IO的状态。但是,我需要为另一个URI上的相同数据使用服务器发送的事件来更新IO状态
改装似乎不支持此功能。我发现了其他似乎可以处理SSE的API,比如EventSource、EventSource Android、OkHttp EventSource和OKSE。所有这些都只是EventSource的不同实现吗?它们在功能上有什么不同
我从阅读别人写的代码中学习;在哪里可以找到如何实现这些功能的示例?我的搜索结果没有提供任何有用的例子。是否有处理服务器发送事件的推荐最佳做法
我真的不想轮询我的服务器以获取更新,我很困惑为什么Android上几乎不支持SSE
以下是我迄今为止实现的一些类,仅供参考
数据模型:
import org.simpleframework.xml.Element;
import org.simpleframework.xml.Root;
@Root(name = "onboardGpio", strict = false)
public class OnboardGPIO
{
@Element(name = "garageDoorFeedbackState")
private String garageDoorState;
@Element(name = "zoneOneState")
private String zoneOneState;
@Element(name = "zoneTwoState")
private String zoneTwoState;
@Element(name = "zoneThreeState")
private String zoneThreeState;
@Element(name = "systemArmedState")
private String systemArmed;
@Element(name = "panelTemperature")
private String panelTemperature;
@Element(name = "garageDoorRelayState")
private String garageDoorRelayState;
@Element(name = "zoneOneRelayState")
private String zoneOneRelayState;
@Element(name = "zoneTwoRelayState")
private String zoneTwoRelayState;
@Element(name = "zoneThreeRelayState")
private String zoneThreeRelayState;
...getters & setters...
}
存储库类
import 安卓x.lifecycle.MutableLiveData;
import ca.thirdgear.homeautomation.http.HomeAutomationAPI;
import ca.thirdgear.homeautomation.http.HomeAutomationController;
import ca.thirdgear.homeautomation.model.OnboardGPIO;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class DataRepository
{
private static DataRepository dataRepository;
private HomeAutomationController homeAutomationController;
private HomeAutomationAPI homeAutomationAPIService;
private MutableLiveData<String> zoneOneState;
private MutableLiveData<String> zoneTwoState;
private MutableLiveData<String> garageDoorState;
public static DataRepository getInstance()
{
if(dataRepository == null)
{
dataRepository = new DataRepository();
}
return dataRepository;
}
private DataRepository()
{
homeAutomationController = HomeAutomationController.getInstance();
homeAutomationAPIService = homeAutomationController.createService(HomeAutomationAPI.class);
zoneOneState = new MutableLiveData<>();
zoneTwoState = new MutableLiveData<>();
garageDoorState = new MutableLiveData<>();
}
//get status of remote API I/O
public void getIoStatus()
{
Call<OnboardGPIO> call = homeAutomationAPIService.getIoStatus();
call.enqueue(new Callback<OnboardGPIO>() {
@Override
public void onResponse(Call<OnboardGPIO> call, Response<OnboardGPIO> response)
{
if(response.isSuccessful())
{
zoneOneState.setValue(response.body().getZoneOneState());
zoneTwoState.setValue(response.body().getZoneTwoState());
garageDoorState.setValue(response.body().getGarageDoorState());
}
}
@Override
public void onFailure(Call<OnboardGPIO> call, Throwable t)
{
//TODO
}
});
... other network calls ...
}
网络类
import okhttp3.Credentials;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import retrofit2.Retrofit;
import retrofit2.converter.simplexml.SimpleXmlConverterFactory;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
@SuppressWarnings("deprecation")
public class HomeAutomationController
{
private static final String BASE_URL = "https://MY_URL/";
private static HomeAutomationController homeAutomationController;
private OkHttpClient okHttpClient;
private Retrofit retrofit;
public static HomeAutomationController getInstance()
{
if(homeAutomationController == null)
{
homeAutomationController = new HomeAutomationController();
}
return homeAutomationController;
}
private HomeAutomationController()
{
//create OkHttpClient
okHttpClient = new OkHttpClient().newBuilder().addInterceptor(new Interceptor() {
@Override
public okhttp3.Response intercept(Chain chain) throws IOException {
Request originalRequest = chain.request();
Request.Builder builder = originalRequest.newBuilder().header("Authorization",
Credentials.basic("USERNAME", "PASSWORD"));
Request newRequest = builder.build();
return chain.proceed(newRequest);
}
})
.readTimeout(0, TimeUnit.SECONDS)
.build();
//create retrofit object
retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(SimpleXmlConverterFactory.create())
.client(okHttpClient)
.build();
}
//create and return http service
public <S> S createService(Class <S> serviceClass)
{
return retrofit.create(serviceClass);
}
}
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