Android不在BroadcastReceiver中烘烤

Question

我有一个BroadcastReceiver，应该在下载完成后祝酒，如下所示：

class DownloadBroadcastReceiver: BroadcastReceiver() {

    override fun onReceive(context: Context, intent: Intent) {
        if (DownloadManager.ACTION_DOWNLOAD_COMPLETE == intent.action) {
            Toast.makeText(context, R.string.toast_save_successful, Toast.LENGTH_SHORT).show()
            Log.d("DownloadBroadcastReceir", "toasted")
        }
    }
}

我可以在日志中看到调试消息但是没有出现toast。

这里有什么显而易见的东西吗？

对于上下文，以下是对下载服务的调用：

val downloader = DownloadManager.Request(uri)
downloader.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE or DownloadManager.Request.NETWORK_WIFI)
        .setDestinationInExternalPublicDir(destinationLocation)
        .setAllowedOverRoaming(true)
        .setTitle(filename)
        .setDescription(resources.getString(R.string.downloader_description, sourceFilename))

(saverActivity.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager).enqueue(downloader)

此处它已在清单中注册：

<receiver android:name=".receiver.DownloadBroadcastReceiver">
    <intent-filter>
        <action android:name="android.intent.action.DOWNLOAD_COMPLETE" />
    </intent-filter>
</receiver>

应用程序通常在下载完成时关闭。这有什么不同吗？