I use single Activity pattern in my app using Navigation component. I use YouTube Android library for playing the video. When I click full screen icon on video player the top and bottom tool bars have to be gone and the screen has to be changed on landscape mode. But after the screen has rotated the activity was recreated and video stops and starts over. The question is how to keep playing the video after the screen has rotated? I found one solution to add configChanges to the manifest file

<activity
            android:name=".ui.MainActivity"
            android:configChanges="orientation|screenSize|keyboardHidden|smallestScreenSize|screenLayout" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

This solved my problem, the activity stopped being recreated when the screen was rotated. But I do not want this behavior in all fragments, I need it only in the fragment where the video player is located.

This is my code in Fragment:

 private fun fullScreenListener() {

        val decorView = activity?.window?.decorView?.let {
            val screenListener = object : YouTubePlayerFullScreenListener {
                override fun onYouTubePlayerEnterFullScreen() {
                    binding.youtubePlayer.enterFullScreen()
                    hideSystemUi(it)
                }

                override fun onYouTubePlayerExitFullScreen() {
                    showSystemUi(it)
                }

            }
            binding.youtubePlayer.addFullScreenListener(screenListener)
        }

    }

    private fun hideSystemUi(view: View) {
        activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE

        MainActivity.hideBottomNavBar()

        WindowCompat.setDecorFitsSystemWindows(requireActivity().window, false)
        WindowInsetsControllerCompat(requireActivity().window,view).let { controller ->
            controller.hide(WindowInsetsCompat.Type.systemBars())
            controller.systemBarsBehavior = WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
        }
    }
    
    private fun showSystemUi(view: View) {

        activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT

        MainActivity.showBottomNavBar()

        WindowCompat.setDecorFitsSystemWindows(requireActivity().window, true)
        WindowInsetsControllerCompat(requireActivity().window, view).show(WindowInsetsCompat.Type.systemBars())

    }

CodePudding user response：

You really do not want to do this. The problem isn't just the restart on rotation, it's that there's at LEAST a dozen situations that can cause an Activity restart, and you can't block some of them. On Android this is really just something you need to live with, and learn how to code to make it cleanly restart.

And no, you can't do configChanges at runtime or only for some fragments. It works on an Activity level.

Instead, you should ask a different question- tell use what isn't working when you rotate, and ask how to fix that with restart.

CodePudding user response：

Based on your new answer- I'm surprised your video view doesn't support this without work. However, if you implement onSaveInstanceState to save the seek time of the video and onRestoreInstanceState to seek to that time, it should work with at most a brief hiccup as it reads in the video.