Android kotlin开发ViewPage2动态添加的Fragment页面使用MediaPlayer+SurfaceView视频播放 网络状态监听详细代码

以下是一个示例代码，演示了在使用ViewPager2动态添加Fragment页面时如何使用MediaPlayer和SurfaceView进行视频播放，并且添加了网络状态监听。

MainActivity.kt:

import android.content.Context
import android.net.ConnectivityManager
import android.net.Network
import android.net.NetworkRequest
import android.os.Bundle
import android.view.SurfaceHolder
import android.view.SurfaceView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.fragment.app.Fragment
import androidx.viewpager2.adapter.FragmentStateAdapter
import androidx.viewpager2.widget.ViewPager2

class MainActivity : AppCompatActivity() {

    private lateinit var viewPager: ViewPager2
    private lateinit var mediaPlayer: MediaPlayer
    private lateinit var surfaceView: SurfaceView

    private lateinit var networkCallback: ConnectivityManager.NetworkCallback

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

        viewPager = findViewById(R.id.viewPager)
        surfaceView = findViewById(R.id.surfaceView)

        // Initialize MediaPlayer
        mediaPlayer = MediaPlayer()

        // Set up ViewPager2 with FragmentStateAdapter
        val adapter = MyFragmentStateAdapter(this)
        viewPager.adapter = adapter

        // SurfaceHolder for SurfaceView
        val surfaceHolder = surfaceView.holder
        surfaceHolder.addCallback(object : SurfaceHolder.Callback {
            override fun surfaceCreated(holder: SurfaceHolder) {
                mediaPlayer.setDisplay(holder)
            }

            override fun surfaceChanged(holder: SurfaceHolder, format: Int, width: Int, height: Int) {
                // No implementation needed
            }

            override fun surfaceDestroyed(holder: SurfaceHolder) {
                mediaPlayer.setDisplay(null)
            }
        })

        // Network state change listener
        networkCallback = object : ConnectivityManager.NetworkCallback() {
            override fun onAvailable(network: Network) {
                // Network is available
                Toast.makeText(applicationContext, "Network available", Toast.LENGTH_SHORT).show()
            }

            override fun onLost(network: Network) {
                // Network is lost
                Toast.makeText(applicationContext, "Network lost", Toast.LENGTH_SHORT).show()
            }
        }

        // Register network callback
        val connectivityManager = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        val networkRequest = NetworkRequest.Builder().build()
        connectivityManager.registerNetworkCallback(networkRequest, networkCallback)
    }

    override fun onDestroy() {
        super.onDestroy()
        // Release MediaPlayer resources
        mediaPlayer.release()

        // Unregister network callback
        val connectivityManager = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        connectivityManager.unregisterNetworkCallback(networkCallback)
    }

    private inner class MyFragmentStateAdapter(activity: AppCompatActivity) : FragmentStateAdapter(activity) {
        override fun getItemCount(): Int {
            return 3
        }

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

MyFragment.kt:

import android.media.MediaPlayer
import android.os.Bundle
import android.view.LayoutInflater
import android.view.SurfaceHolder
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment

class MyFragment : Fragment() {

    private lateinit var mediaPlayer: MediaPlayer
    private lateinit var surfaceHolder: SurfaceHolder

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val view = inflater.inflate(R.layout.fragment_my, container, false)

        val surfaceView = view.findViewById<SurfaceView>(R.id.surfaceView)
        surfaceHolder = surfaceView.holder

        // Initialize MediaPlayer
        mediaPlayer = MediaPlayer()

        // SurfaceHolder callback
        surfaceHolder.addCallback(object : SurfaceHolder.Callback {
            override fun surfaceCreated(holder: SurfaceHolder) {
                mediaPlayer.setDisplay(holder)
            }

            override fun surfaceChanged(holder: SurfaceHolder, format: Int, width: Int, height: Int) {
                // No implementation needed
            }

            override fun surfaceDestroyed(holder: SurfaceHolder) {
                mediaPlayer.setDisplay(null)
            }
        })

        // Set data source for MediaPlayer (replace with your video URL)
        mediaPlayer.setDataSource("YOUR_VIDEO_URL")
        mediaPlayer.prepareAsync()

        return view
    }

    override fun onDestroyView() {
        super.onDestroyView()
        // Release MediaPlayer resources
        mediaPlayer.release()
    }
}

activity_main.xml:

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <SurfaceView
        android:id="@+id/surfaceView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center" />

</androidx.constraintlayout.widget.ConstraintLayout>

fragment_my.xml:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <SurfaceView
        android:id="@+id/surfaceView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center" />

</FrameLayout>

请注意，您需要将“YOUR_VIDEO_URL”替换为实际的视频URL。此外，还需要在您的AndroidManifest.xml文件中添加适当的权限和配置，以便进行网络访问和视频播放