如何在Android上停止IntentService？

Question

我的应用程序中正在运行IntentService。当用户按下“取消”按钮时，我想停止，但onHandleIntent会继续运行，即使在调用onDestroy（IntentService）时也是如此。

在执行过程中，我尝试了StSelfFe（），StutoIn（int）和StestService（意图），但不起作用。

class DownloadIntentService : IntentService("DownloadIntentService") {

    val TAG: String = "DownloadIntentService"

    val AVAILABLE_QUALITIES: Array<Int> = Array(5){240; 360; 480; 720; 1080}

    // TODO Configurations
    val PREFERED_LANGUAGE = "esLA"
    val PREFERED_QUALITY = AVAILABLE_QUALITIES[0]

    @Inject
    lateinit var getVilosDataInteractor: GetVilosInteractor

    @Inject
    lateinit var getM3U8Interactor: GetM3U8Interactor

    @Inject
    lateinit var downloadDataSource: DownloadsRoomDataSource

    companion object {
        var startedId: Int = 0
    }

    override fun onCreate() {
        super.onCreate()
        (application as CrunchApplication).component.inject(this)
    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        Log.d(TAG, "onStartComand ${startId}")

        startedId = startId

        super.onStartCommand(intent, flags, startId)
        return Service.START_NOT_STICKY
    }

    override fun onHandleIntent(intent: Intent?) {
        Log.d(TAG, "starting download service")

        val download = downloadDataSource.getDownloadById(intent?.getLongExtra(MEDIA_ID_EXTRA, 0) ?: 0)

        Log.d(TAG, "A new download was found: ${download.id} ${download.serieName} ${download.collectionName} ${download.episodeName}")

        val vilosResponse = getVilosDataInteractor(download.episodeUrl)

        val stream: StreamData? = vilosResponse.streams.filter {
            it.hardsubLang?.equals(PREFERED_LANGUAGE) ?: false
        }.getOrNull(0)

        if(stream == null) {
            Log.d(TAG, "Stream not found with prefered language ($PREFERED_LANGUAGE)")
            return
        }

        Log.d(TAG, "Best stream option: " + stream.url)
        val m3u8Response = getM3U8Interactor(stream.url)

        val m3u8Data: M3U8Data? = m3u8Response.playlist.filter { it.height == PREFERED_QUALITY }[0]

        if(m3u8Data == null) {
            Log.d("M3U8","Resolution ${PREFERED_QUALITY}p not found")
            return
        }

        Log.d(TAG, m3u8Data.url)

        val root = Environment.getExternalStorageDirectory().toString()
        val myDir = File(root + "/episodes/");
        if (!myDir.exists()) {
            myDir.mkdirs()
        }

        val output = myDir.getAbsolutePath() + "EPISODENAME.mp4";
        val cmd = "-y -i ${m3u8Data.url} ${output}"

        when (val result: Int = FFmpeg.execute(cmd)) {
            Config.RETURN_CODE_SUCCESS -> Log.d(TAG, "Success")
            Config.RETURN_CODE_CANCEL -> Log.d(TAG, "Cancel")
            else -> Log.d(TAG, "Default: $result")
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        Log.d(TAG, "onDestroy")
    }
}

我试图从碎片中停下来

val intent = Intent(requireContext(), DownloadIntentService::class.java)
requireContext().stopService(intent)

提前感谢

Answer 1

基本上你不能。OnHandleIntent在工作线程上运行。要停止它，你必须做与任何其他线程相同的事情，即在onHandleIntent中进行布尔标志检查，然后在执行操作之前检查该标志是否为真。现在，如果要取消，请将标志更新为false。

这也取决于你在做什么。如果已经在处理中，tat将继续运行。不是，你必须有状态机才能让它停止。