如何在 exoplayer 中播放本地媒体文件的硬编码内容 uri

Question

最初我选择了一个 Intent 选择器来选择一个媒体文件，在 onActivityResult 我得到了 uri

fun openVideo(view: View) {
        val intent = Intent(Intent.ACTION_PICK, MediaStore.Video.Media.EXTERNAL_CONTENT_URI)
        intent.type = "video/*"
        startActivityForResult(
            Intent.createChooser(intent, "Select video"),
            REQUEST_TAKE_GALLERY_VIDEO
        )
    }

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
       ...
       ...     
            val selectedVideoUri: Uri? = data!!.data
            val vidPath: String = selectedVideoUri.toString()
            video_uri = Uri.parse(vidPath)

// the video uri looks like below      
//content://com.mi.android.globalFileexplorer.myprovider/external_files/Download/Dolittle%20(2020)%20%5B720p%5D%20%5BBluRay%5D%20%5BYTS.MX%5D/Dolittle.2020.720p.BluRay.x264.AAC-%5BYTS.MX%5D.mp4
            
           initializePlayer(video_uri)
       ...
       ...
        }
    }

然后就可以在exoplayer中播放本地文件了

 fun initializePlayer(video_uri) {
        println("log initializePlayer called")
        player = ExoPlayerFactory.newSimpleInstance(this) // `player` was defined in GlobalVariables
        id_player_view.player = player

        if (video_uri != null) {
            println("log $video_uri ${video_uri!!::class.simpleName}")
            id_player_view.useController = true
            var mediaSource: MediaSource = buildMediaSource(video_uri!!)
            player?.playWhenReady = playWhenReady!!
            player?.seekTo(currentWindow!!, playBackPosition!!)
            player?.prepare(mediaSource, false, false)
        }
    }

但是现在，想想我把 uri 作为字符串保存在数据库中。然后，假设我从数据库中检索了内容并将其作为意图传递给视频播放 activity

现在，如果我编写这样的代码，并调用 initializePlayer 视频将无法播放。

video_uri = Uri.parse((intent.getStringExtra("video_url")))
println("log $video_uri ${video_uri!!::class.simpleName}")

initializePlayer(video_uri)

即所有硬编码的 content uri 本地媒体文件。 exoplayer 不工作。

如何解决这个问题？

Answer 1

think that I saved the uri in database as a string

您不再有权访问该内容。

How to solve this issue ?

使用ACTION_OPEN_DOCUMENT让用户选择内容。然后，在 onActivityResult() 中，在 ContentResolver 上调用 takePersistableUriPermission()，以便在更长的时间内访问该内容。有关更多信息，请参阅 this blog post and the documentation。

如何在 exoplayer 中播放本地媒体文件的硬编码内容 uri

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