在OnServiceConnected中初始化Service Binder之前调用的LiveData观察器

Question

我有开关偏好设置，应该启动/停止一些内部服务工作。已按预期在onServiceConnected中初始化了服务API（活页夹）。但是，当我转到首选项屏幕时，取消绑定并停止服务。

我正在使用LiveData处理主要活动的偏好更改。但是问题是，当它再次变为活动状态并调用观察者时，onServiceConnected仍然没有被调用，ServiceApi(Binder)观察者中启动/停止smth所需的LiveData尚未初始化。

通过偏好更改在Android服务中进行更改的正确方法是什么？

public class CameraServiceConnection implements ServiceConnection {
    public CameraServiceApi cameraServiceApi;

    @Override
    public void onServiceConnected(ComponentName name, IBinder service){
        cameraServiceApi = (CameraServiceApi) service;
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        cameraServiceApi = null;
    }

    @Override
    public void onBindingDied(ComponentName name) {
        cameraServiceApi = null;
    }
}


In MainActivity:

LiveData<Boolean> fpsEnabled = new SharedPreferenceBooleanLiveData(prefs, "fpsEnabled", false);
fpsEnabled.observe(this, this::onFpsEnabled);

private void onFpsEnabled(boolean enabled) {
// cameraServiceApi is always null here! will be initialized later        
if (cameraServiceConnection.cameraServiceApi != null) {
if(enabled) {
cameraServiceConnection.cameraServiceApi.init();
}
}
}