添加权限和服务声明

<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
<service
            android:name=".ScreenService"
            android:enabled="true"
            android:exported="true"
            android:foregroundServiceType="mediaProjection"></service>

创建屏幕录制的 Service

import android.app.*
import android.content.Context
import android.content.Intent
import android.graphics.BitmapFactory
import android.hardware.display.DisplayManager
import android.hardware.display.VirtualDisplay
import android.media.CamcorderProfile
import android.media.MediaRecorder
import android.media.projection.MediaProjection
import android.media.projection.MediaProjectionManager
import android.os.Build
import android.os.IBinder
import android.util.DisplayMetrics
import android.util.Log
import android.view.WindowManager
import androidx.core.app.NotificationCompat
import java.io.IOException

class ScreenService : Service() {

    private var mContext:Context?=null
    private var projectionManager:MediaProjectionManager?=null
    private var mMediaProjection:MediaProjection?=null
    override fun onBind(intent: Intent): IBinder {
        TODO("Return the communication channel to the service.")
    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        mContext = this
        var resultCode = intent?.getIntExtra("resultCode", -1)
        var path = intent?.getStringExtra("path")
        var resultData: Intent? = intent?.getParcelableExtra("data")
        startNotification();
        projectionManager = getSystemService(MEDIA_PROJECTION_SERVICE) as MediaProjectionManager
        mMediaProjection = resultCode?.let { resultData?.let { it1 -> projectionManager?.getMediaProjection(it, it1) } }
        path?.let { startRecording(it) }
        return super.onStartCommand(intent, flags, startId)
    }

    private var NOTIFICATION_CHANNEL_ID="id";
    private var NOTIFICATION_CHANNEL_NAME="channel";
    private var NOTIFICATION_CHANNEL_DESC="desc";
    private fun startNotification() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            var notificationIntent = Intent(mContext, ScreenService::class.java)
            var pendingIntent: PendingIntent?=null
            pendingIntent = if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S) {
                PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_IMMUTABLE);
            } else {
                PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_ONE_SHOT);
            }
            var  notificationBuilder = mContext?.let {
                NotificationCompat.Builder(it, NOTIFICATION_CHANNEL_ID)
                    .setLargeIcon(BitmapFactory.decodeResource(mContext!!.resources, R.drawable.ic_launcher_foreground))
                    .setSmallIcon(R.drawable.ic_launcher_foreground)
                    .setContentTitle("start record")
                    .setContentText("=== start record ===")
                    .setContentIntent(pendingIntent)
            };
            var  notification = notificationBuilder?.build();
            var  channel = NotificationChannel(NOTIFICATION_CHANNEL_ID, NOTIFICATION_CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
            channel.description = NOTIFICATION_CHANNEL_DESC;
            var  notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
            notificationManager.createNotificationChannel(channel)
            startForeground(1, notification);
        }
    }


    private var isScreenRecoding = false
    private var  mMediaRecorder: MediaRecorder?=null
    private var mVirtualDisplay: VirtualDisplay? = null
    private fun startRecording(filePath:String) {
        if (!isScreenRecoding){
            try {
                // 创建 MediaRecorder 并设置参数
                val metrics = DisplayMetrics()
                val windowManager: WindowManager = mContext?.getSystemService(WINDOW_SERVICE) as WindowManager
                windowManager.defaultDisplay.getMetrics(metrics)
                mMediaRecorder = MediaRecorder()
                mMediaRecorder?.setVideoSource(MediaRecorder.VideoSource.SURFACE)
                mMediaRecorder?.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4)
                mMediaRecorder?.setOutputFile(filePath)
                mMediaRecorder?.setVideoSize(metrics.widthPixels, metrics.heightPixels)
                mMediaRecorder?.setVideoEncoder(MediaRecorder.VideoEncoder.H264)
                mMediaRecorder?.setVideoEncodingBitRate(1920*1080 * 3)
                mMediaRecorder?.setVideoFrameRate(30)

                // 准备 MediaRecorder
                mMediaRecorder?.prepare()

                // 创建 VirtualDisplay 以获取屏幕内容
                mVirtualDisplay = mMediaProjection?.createVirtualDisplay(
                    "ScreenRecord",
                    metrics.widthPixels, metrics.heightPixels, metrics.densityDpi,
                    DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
                    mMediaRecorder?.surface, null, null
                )

                // 开始录制
                mMediaRecorder?.start()
                isScreenRecoding = true
                Log.i(ScreenUtil.TAG,"开始录屏 $filePath")
            } catch (e: IOException) {
                Log.e(ScreenUtil.TAG, "录屏失败: " + e.message)
                e.printStackTrace()
            }
        }
    }
    public fun stopRecording() {
        if (isScreenRecoding) {
            try {
                // 停止录制
                mMediaRecorder?.stop()
                mMediaRecorder?.reset()
                mMediaRecorder?.release()
                mMediaRecorder = null

                // 停止 VirtualDisplay
                mVirtualDisplay?.release()

                // 停止 MediaProjection
                mMediaProjection?.stop()
                Log.i(ScreenUtil.TAG,"结束录屏")
            } catch (e: Exception) {
                Log.e(ScreenUtil.TAG, "停止录屏失败: " + e.message)
                e.printStackTrace()
            }
            isScreenRecoding = false
        }
    }

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

启动和停止录制

private var mProjectionManager: MediaProjectionManager? = null
var screenService:Intent?=null
fun start(){
	mProjectionManager = getSystemService(Context.MEDIA_PROJECTION_SERVICE) as MediaProjectionManager
	// 请求录屏权限
	startActivityForResult(mProjectionManager?.createScreenCaptureIntent(), 500);
}
fun stop(){
	stopService(screenService)
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    if (requestCode == 500){
        screenService = Intent(mConext, ScreenService::class.java)
        screenService?.let {
            it.putExtra("resultCode", resultCode);
            it.putExtra("data", data);
            it.putExtra("path", "screen.mp4");
            startForegroundService(it)
        }
    }
}