android - VideoView无法打开下载目录中的视频文件(权限被拒绝)

Question

我在模拟器中使用了 Android 10 AVD。我将示例视频文件(“sample.mp4”)复制到模拟器，然后尝试播放它。该 Activity 有一个 VideoView 和一个 Button。我尝试在单击按钮时播放视频，但因“权限被拒绝”而失败。当然，我已经添加了“外部存储读取”权限，并在“应用信息”中手动启用了它。但由于它不起作用，我还添加了 requestPermissions() 并在运行时启用了权限。两者均无效。

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    button.setOnClickListener {
        videoView.setVideoPath("/sdcard/Download/sample.mp4");
        videoView.start();
    }

    val permissions = arrayOf<String>(
        Manifest.permission.WRITE_EXTERNAL_STORAGE,
        Manifest.permission.READ_EXTERNAL_STORAGE
    )
    requestPermissions(permissions, 2222)

错误信息:

W/VideoView: Unable to open content: /sdcard/Download/sample.mp4
    java.io.FileNotFoundException: /sdcard/Download/sample.mp4: open failed: EACCES (Permission denied)
        at libcore.io.IoBridge.open(IoBridge.java:496)

不是因为路径不对，因为我给的是假路径，错误不一样。

Unable to open content: /sdcard/Download/samplexxx.mp4
    java.io.FileNotFoundException: /sdcard/Download/samplexxx.mp4: open failed: ENOENT (No such file or directory)

传递 /storage/emulated/0/Download/sample.mp4 给了我同样的“权限被拒绝”错误。

Answer 1

尝试此代码获取访问权限

   if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {

        // Should we show an explanation?
        if (shouldShowRequestPermissionRationale(Manifest.permission.READ_EXTERNAL_STORAGE)) {
            // Explain to the user why we need to read the contacts
        }

        requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);

        // MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE is an
        // app-defined int constant that should be quite unique

        return;
    }ode here