LiveDataBus

LiveDataBus.get()
        .with("key_test", String.class)
        .observe(this, new Observer() {
            @Override
            public void onChanged(@Nullable String s) {
            }
        });

LiveDataBus.get().with("key_test").setValue(s);

public final class LiveDataBus {

    private final Map> bus;

    private LiveDataBus() {
        bus = new HashMap<>();
    }

    private static class SingletonHolder {
        private static final LiveDataBus DEFAULT_BUS = new LiveDataBus();
    }

    public static LiveDataBus get() {
        return SingletonHolder.DEFAULT_BUS;
    }

    public  MutableLiveData with(String key, Class type) {
        if (!bus.containsKey(key)) {
            bus.put(key, new BusMutableLiveData<>());
        }
        return (MutableLiveData) bus.get(key);
    }

    public MutableLiveData