Android Oreo（API26）和android.app.DownloadManager

Question

伙计们！ 此代码在Android Oreo上不起作用（但在旧版本上可以，我可以看到通知和DownloadManager.ACTION_DOWNLOAD_COMPLETE广播消息）。

科特林

testButton.setOnClickListener {
    val downloadManager = getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
    val uri = Uri.parse("[url for a mp3 file]")
    val request = DownloadManager.Request(uri)

    request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI)
    request.setAllowedOverRoaming(false)
    request.setTitle("Test mp3")
    request.setDescription("Wow!")
    request.setVisibleInDownloadsUi(true)
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE)
    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "/GadgetSaint/"  + "/" + "Sample" + ".mp3")

    val reference = downloadManager.enqueue(request)
}

Answer 1

我发现API 26仿真器通过移动数据模拟网络请求，因此最简单的解决方法是添加NETWORK_MOBILE标志（至少用于调试DownloadManager ）：

request.setAllowedNetworkTypes(DownloadManager.Request.NETWO‌​RK_WIFI | DownloadManager.Request.NETWORK_MOBILE)