Android kotlin ViewPage2动态添加Fragment 在fragment中使用ExoPlayer

要在Fragment中使用ExoPlayer，首先需要在项目中添加ExoPlayer的依赖项。在项目的build.gradle文件中添加以下代码：

implementation 'com.google.android.exoplayer:exoplayer-core:2.14.1'
implementation 'com.google.android.exoplayer:exoplayer-ui:2.14.1'

接下来，你可以创建一个继承自Fragment的自定义Fragment类，并在其onCreateView方法中初始化ExoPlayer，并在onDestroyView方法中释放ExoPlayer。

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import com.google.android.exoplayer2.DefaultLoadControl
import com.google.android.exoplayer2.ExoPlayerFactory
import com.google.android.exoplayer2.SimpleExoPlayer
import com.google.android.exoplayer2.source.MediaSource
import com.google.android.exoplayer2.source.ProgressiveMediaSource
import com.google.android.exoplayer2.trackselection.DefaultTrackSelector
import com.google.android.exoplayer2.ui.PlayerView
import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory
import com.google.android.exoplayer2.util.Util

class YourFragment : Fragment() {
    private lateinit var player: SimpleExoPlayer
    private lateinit var playerView: PlayerView

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        val rootView = inflater.inflate(R.layout.your_fragment_layout, container, false)
        playerView = rootView.findViewById(R.id.player_view)
        return rootView
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        val userAgent = Util.getUserAgent(requireContext(), "YourApplicationName")
        val dataSourceFactory = DefaultDataSourceFactory(requireContext(), userAgent)
        val mediaSource: MediaSource = ProgressiveMediaSource.Factory(dataSourceFactory)
            .createMediaSource(/* your media uri */)
        player = ExoPlayerFactory.newSimpleInstance(requireContext(), DefaultTrackSelector(), DefaultLoadControl())
        player.prepare(mediaSource)
        playerView.player = player
        player.playWhenReady = true
    }

    override fun onDestroyView() {
        super.onDestroyView()
        player.release()
    }
}

在你的ViewPager2适配器中，你可以通过动态添加Fragment来使用这个自定义Fragment类。

class YourPagerAdapter(fragmentManager: FragmentManager, lifecycle: Lifecycle) :
    FragmentStateAdapter(fragmentManager, lifecycle) {

    override fun getItemCount(): Int {
        return /* number of fragments in your ViewPager2 */
    }

    override fun createFragment(position: Int): Fragment {
        return YourFragment()
    }
}

然后，你可以将这个PagerAdapter设置给你的ViewPager2：

val viewPager2: ViewPager2 = findViewById(R.id.view_pager2)
val adapter = YourPagerAdapter(supportFragmentManager, lifecycle)
viewPager2.adapter = adapter

这样，你就可以动态地在ViewPager2中添加使用ExoPlayer的Fragment了。