ExoPlayer OkHttpDataSource传输侦听器和进度通知不起作用

问题描述

我正在使用Exoplayer DownloadService进行媒体下载。当我为OkHttpDataSourceFactory设置DownloadManager时，TransferListener未显示下载进度，Notification（进度通知）未更新，但TransferListener和Notification（进度通知）可以与DefaultHttpDataSourceFactory配合使用。

下载服务：

class MyDownloadService : DownloadService {

    //...
    
    override fun getDownloadManager(): DownloadManager {
        val myApplication = application as MyApplication
        return DownloadManager(
            applicationContext,myApplication.getDatabaseProvider(),//singleton
            myApplication.getDownloadCache(),//singleton
            myApplication.getDataSourceFactory()  //singleton
        ).apply {
            addListener(
                DownloadStateListener(
                    applicationContext,myApplication.getNotificationHelper(),FOREGROUND_NOTIFICATION_ID
                )
            )
        }
    }

    override fun getForegroundNotification(downloads: MutableList<Download>): Notification {
        //...
        val myApplication = application as MyApplication
        return myApplication.getNotificationHelper()
            .buildProgressNotification(R.drawable.ic_android,null,downloads)
    }


    //...


class DownloadStateListener(
        private val context: Context,private val notificationHelper: DownloadNotificationHelper,firstNotificationId: Int
    ) : DownloadManager.Listener {
        private var nextNotificationId = firstNotificationId

        override fun onDownloadChanged(downloadManager: DownloadManager,download: Download) {
            val notification: Notification
            if (download.state == Download.STATE_COMPLETED) {
                notification = notificationHelper
                    .buildDownloadCompletedNotification(R.drawable.ic_android,null)
            } else if (download.state == Download.STATE_FAILED) {
                notification = notificationHelper
                    .buildDownloadFailedNotification(R.drawable.ic_android,null)
            } else
                return
            NotificationUtil.setNotification(context,nextNotificationId++,notification)
        }
    }

}

OkHttpDataSourceFactory的实例：

fun getDataSourceFactory(): OkHttpDataSourceFactory =
        if (::dataSourceFactory.isInitialized) dataSourceFactory
        else OkHttpDataSourceFactory(
            getOkHttpClient(),applicationContext.packageName,object : TransferListener {
                override fun onTransferInitializing(source: DataSource?,dataSpec: DataSpec?,isNetwork: Boolean) {
                    Log.v("exoplayerDownload","initializing")
                }

                override fun onTransferStart(source: DataSource?,"started")
                }

                override fun onTransferEnd(source: DataSource?,"finished")
                }

                override fun onBytesTransferred(source: DataSource?,isNetwork: Boolean,bytesTransferred: Int) {
                    Log.v("exoplayerDownload","downloading")
                }
            },/*cache control=*/ null
        ).apply { dataSourceFactory = this }

日志：

//on download start
V/exoplayerDownload: initializing

//on download finish
V/exoplayerDownload: started
V/exoplayerDownload: downloading
V/exoplayerDownload: downloading
...
V/exoplayerDownload: downloading
V/exoplayerDownload: downloading
V/exoplayerDownload: finished

如何在OkHttpDataSourceFactory之类的DefaultHttpDataSourceFactory上获得下载进度？

感谢您的帮助

解决方法

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