EACCES（拒绝权限），即使在授予权限后也是如此

Question

我有一个针对SDK28的Android应用程序，所以我有处理的权限。我检查是否设置了read_external_storage，但当Exoplayer尝试读取文件（我验证该文件确实存在）时，我看到

com.google.android.exoplayer2.upstream.filedatasource$filedatasourceException：java.io.fileNotfoundexception：/storage/emulated/0/dcim/camera/vid_20190610_200249.mp4:打开失败：EACCES（拒绝权限）。

player = ExoPlayerFactory.newSimpleInstance(this, DefaultTrackSelector())
    playerView.player = player
    player?.addListener(this)

    //TODO: Change this when we are given the embedded video
    val dataSource = DefaultDataSourceFactory(this, Util.getUserAgent(this, "Exoplayer"))
    var path: String = ""
    var mediaSource: ExtractorMediaSource

    if (passedUrl == PLAY_TUTORIAL) {
        path = "asset:///tutorial_video.mp4"
        mediaSource = ExtractorMediaSource.Factory(dataSource).createMediaSource(Uri.parse(path))
    } else {
        path = passedUrl

        val file = File(path)
        val uriPath = Uri.fromFile(file)

        Timber.d("Path is $uriPath and that file exists = ${file.exists()}")


        mediaSource = ExtractorMediaSource.Factory(dataSource).createMediaSource(uriPath)
    }

    //Setting this to 0 will keep the controls from being hidden otherwise it's in milliseconds
    playerView.controllerShowTimeoutMs = 1500

    player?.prepare(mediaSource)

当我运行代码时,我在日志中看到了以下内容：

2019-06-13 21:54:35.048 5774-5774/com.android.myapp D/ViewTutorialActivity: Path is file:///storage/emulated/0/DCIM/Camera/VID_20190610_200249.mp4 and that file exists = true

2019-06-13 21:54:35.076 5774-5846/com.android.myapp D/OpenGLRenderer: Setting buffer count to 3, min_undequeued 1, extraBuffers 0

2019-06-13 21:54:38.077 5774-5968/com.android.myapp E/ExoPlayerImplInternal: Source error.
com.google.android.exoplayer2.upstream.FileDataSource$FileDataSourceException: java.io.FileNotFoundException: /storage/emulated/0/DCIM/Camera/VID_20190610_200249.mp4: open failed: EACCES (Permission denied)
    at com.google.android.exoplayer2.upstream.FileDataSource.open(FileDataSource.java:73)

知道吗？

Answer 1

好的，这是一个AndroidQ的东西。可以通过启用遗留支持来解决问题。同样的代码在以前的Android版本上运行得很好。