如何将 MVVM 与绑定服务一起使用？

Question

我有一个绑定服务作为处理 exoplayer 的前台服务启动。

这是我的片段处理服务的方式-

@AndroidEntryPoint
class AudioPlayerFragment: Fragment() {

    private var binding: AudioPlayerFragmentBinding by autoCleared()

    private lateinit var podcast: Podcast

    private lateinit var podcastPlayerService: PodcastPlayerService
    private var isBound = false

    private val connection = object: ServiceConnection {

        override fun onServiceConnected(p0: ComponentName?, iBinder: IBinder?) {

            val binder = iBinder as PodcastPlayerService.LocalBinder
            podcastPlayerService = binder.getService()
            isBound = true

            initPlayer()
        }

        override fun onServiceDisconnected(p0: ComponentName?) {

            isBound = false
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        binding = AudioPlayerFragmentBinding.inflate(inflater, container, false)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        podcast = arguments?.getParcelable(ExtrasKeyAndValues.KEY_PODCAST)!!
        binding.title.text = podcast.title
        binding.description.text = podcast.description
        startPodcastPlayerService(podcast)

        binding.exoPlayerView.useController = true
        binding.exoPlayerView.showController()
        binding.exoPlayerView.controllerAutoShow = true
        binding.exoPlayerView.controllerHideOnTouch = false
    }

    override fun onStart() {
        super.onStart()

        Intent(activity, PodcastPlayerService::class.java).also {
                intent -> activity?.bindService(intent, connection, Context.BIND_AUTO_CREATE)
        }
        initPlayer()
    }

    override fun onStop() {

        activity?.unbindService(connection)
        isBound = false

        super.onStop()
    }

    private fun initPlayer() {
        if (isBound) {
            val player: SimpleExoPlayer = podcastPlayerService.getPlayerInstance()
            binding.exoPlayerView.player = player
        }
    }

    private fun startPodcastPlayerService(podcast: Podcast) {
        val intent = Intent(context, PodcastPlayerService::class.java)
        val serviceBundle = Bundle()
        serviceBundle.putParcelable(ExtrasKeyAndValues.KEY_PODCAST, podcast)
        intent.putExtra(ExtrasKeyAndValues.BUNDLE_PODCAST_SERVICE, serviceBundle)
        context?.let { Util.startForegroundService(it, intent) }
    }
}

问题是服务（显然）在 phone 轮换（配置更改）时重新启动。我如何以服务不重新启动但仅将其自身附加到片段及其 UI?

的方式构建我的应用程序

将它放在 ViewModel 中没有意义，因为建议避免将 android 框架相关的东西放在那里。

Answer 1

这里最好创建类似 VideoHelper class 的内容，其中将包括所有与播放器相关的代码和初始化。包括控制播放器状态和其他相关事物的功能。参考你的问题 service is not restarted but just attaches itself to the fragment and its UI，我记得我实现了在 onPause 或 onStop 中保存视频状态和进度的逻辑，并在 onResume 时将其恢复。基本上，您需要创建单独的 VideoHelper 函数，例如 getProgress 并在 onPause 或 onStop 中调用它，而您应该从 [=14] 中调用函数 setProgress =] 并在设置之前检查它是否为空或 null。您可以随心所欲地保存进度 - 共享首选项或一些静态数据或其他任何内容。

如何将 MVVM 与绑定服务一起使用？

How do I use MVVM with bound service?

android

android-service

android-mvvm

android-architecture-lifecycle

android-architecture-components