Ensuring only a single instance of the RxBleClient

Question

Maybe I'm not understanding the situation correctly, but we're told it's important to have only one instance of the RxBleClient.

Couldn't this be easily accomplished by making it a static member of the Application class?

class MyApp extends Application {
    static RxBleClient rxBleClient; 
    ...
}

Also, I'm having a hard time understanding this code (from your Application class):

   public static RxBleClient getRxBleClient(Context context) {
       RxBleApp application = (RxBleApp) context.getApplicationContext();
       return application.rxBleClient;
   }

Could you help me understand what it's doing, and why? Why couldn't it simply

return rxBleClient;

Answer 1

It can be accomplished with taking the static member of the class. Tough it is more elegant to pass it through the instance of RxBleApp which make it more testable (if there were any tests for the sample part).

The RxBleClient is referenced in the RxBleApp which is the android Application. The application context can be retrieved from the Context.