ExoPlayer for media playback

package com.example.myapp.ui.player

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.example.myapp.databinding.ActivityVideoPlayerBinding
import com.google.android.exoplayer2.ExoPlayer
import com.google.android.exoplayer2.MediaItem
import com.google.android.exoplayer2.PlaybackException
import com.google.android.exoplayer2.Player
import com.google.android.exoplayer2.source.ProgressiveMediaSource
import com.google.android.exoplayer2.upstream.DefaultDataSource
import com.google.android.exoplayer2.util.Util

class VideoPlayerActivity : AppCompatActivity() {

    private lateinit var binding: ActivityVideoPlayerBinding
    private var player: ExoPlayer? = null
    private var playWhenReady = true
    private var currentPosition = 0L
    private var currentWindow = 0

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityVideoPlayerBinding.inflate(layoutInflater)
        setContentView(binding.root)

        val videoUrl = intent.getStringExtra("video_url")
        videoUrl?.let { initializePlayer(it) }
    }

    private fun initializePlayer(videoUrl: String) {
        player = ExoPlayer.Builder(this)
            .build()
            .also { exoPlayer ->
                binding.playerView.player = exoPlayer

                val mediaItem = MediaItem.fromUri(videoUrl)
                exoPlayer.setMediaItem(mediaItem)

                // Restore playback state
                exoPlayer.playWhenReady = playWhenReady
                exoPlayer.seekTo(currentWindow, currentPosition)

                exoPlayer.addListener(object : Player.Listener {
                    override fun onPlaybackStateChanged(state: Int) {
                        when (state) {
                            Player.STATE_BUFFERING -> {
                                binding.progressBar.visibility = android.view.View.VISIBLE
                            }
                            Player.STATE_READY -> {
                                binding.progressBar.visibility = android.view.View.GONE
                            }
                            Player.STATE_ENDED -> {
                                // Video ended
                            }
                            Player.STATE_IDLE -> {
                                // Player idle
                            }
                        }
                    }

                    override fun onPlayerError(error: PlaybackException) {
                        // Handle playback error
                        showError(error.message ?: "Playback error")
                    }

                    override fun onIsPlayingChanged(isPlaying: Boolean) {
                        if (isPlaying) {
                            // Active playback
                        } else {
                            // Paused
                        }
                    }
                })

                exoPlayer.prepare()
            }
    }

    private fun releasePlayer() {
        player?.let { exoPlayer ->
            playWhenReady = exoPlayer.playWhenReady
            currentPosition = exoPlayer.currentPosition
            currentWindow = exoPlayer.currentMediaItemIndex
            exoPlayer.release()
        }
        player = null
    }

    override fun onStart() {
        super.onStart()
        if (Util.SDK_INT > 23) {
            intent.getStringExtra("video_url")?.let { initializePlayer(it) }
        }
    }

    override fun onResume() {
        super.onResume()
        if (Util.SDK_INT <= 23 || player == null) {
            intent.getStringExtra("video_url")?.let { initializePlayer(it) }
        }
    }

    override fun onPause() {
        super.onPause()
        if (Util.SDK_INT <= 23) {
            releasePlayer()
        }
    }

    override fun onStop() {
        super.onStop()
        if (Util.SDK_INT > 23) {
            releasePlayer()
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        releasePlayer()
    }

    private fun showError(message: String) {
        // Show error toast or dialog
    }
}