SurfaceView 截屏方案

1.PixelCopy这个类是安卓提供的截取SurfaceView 的一个类：

        val surfaceView: SurfaceView = binding.realTimeMap.getBinding()val bitmap = Bitmap.createBitmap(surfaceView.width, surfaceView.height, Bitmap.Config.ARGB_8888)val surfaceHolder = surfaceView.holderif (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {val copyResult = PixelCopy.request(surfaceHolder.surface,bitmap,PixelCopy.OnPixelCopyFinishedListener { copyResult ->if (copyResult == PixelCopy.SUCCESS) {// 截图成功，可以在这里处理Bitmap对象binding.ivMaxSpeed.setImageBitmap(bitmap)} else {// 截图失败，根据需要进行处理}},Handler() // 可选的Handler对象，用于指定回调在哪个线程执行，如果不指定，默认在主线程执行)}

2.使用MediaProjection ，这个是系统级的截屏方法，但是比较繁琐：
a.建立前台服务；
//启动MediaService服务

    fun startMediaService() {if (isstartservice) {startService(Intent(this, MediaService::class.java))isstartservice = false}}***## MediaSercice:***:
package com.allynav.iefa.serviceimport android.R
import android.app.*
import android.content.Context
import android.content.Intent
import android.graphics.BitmapFactory
import android.os.Build
import android.os.IBinder
import androidx.core.app.NotificationCompatclass MediaService : Service() {private val NOTIFICATION_CHANNEL_ID = "com.tencent.trtc.apiexample.MediaService"private val NOTIFICATION_CHANNEL_NAME = "com.tencent.trtc.apiexample.channel_name"private val NOTIFICATION_CHANNEL_DESC = "com.tencent.trtc.apiexample.channel_desc"override fun onCreate() {super.onCreate()startNotification()}fun startNotification() {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//Call Start foreground with notificationval notificationIntent = Intent(this, MediaService::class.java)val pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0)val notificationBuilder: NotificationCompat.Builder = NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID).setLargeIcon(BitmapFactory.decodeResource(getResources(),R.drawable.alert_dark_frame)).setSmallIcon(R.drawable.alert_dark_frame).setContentTitle("Starting Service").setContentText("Starting monitoring service").setContentIntent(pendingIntent)val notification: Notification = notificationBuilder.build()val channel = NotificationChannel(NOTIFICATION_CHANNEL_ID,NOTIFICATION_CHANNEL_NAME,NotificationManager.IMPORTANCE_DEFAULT)channel.description = NOTIFICATION_CHANNEL_DESCval notificationManager =getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManagernotificationManager.createNotificationChannel(channel)startForeground(1,notification) //必须使用此方法显示通知，不能使用notificationManager.notify，否则还是会报上面的错误}}override fun onBind(intent: Intent?): IBinder {throw UnsupportedOperationException("Not yet implemented")}
}b.// 申请截屏权限private fun getScreenShotPower() {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {mediaProjectionManager =getSystemService(Context.MEDIA_PROJECTION_SERVICE) as MediaProjectionManagerif (mediaProjectionManager != null) {val intent = mediaProjectionManager!!.createScreenCaptureIntent()startActivityForResult(intent, REQUEST_MEDIA_PROJECTION)}}}c.  @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)override fun onActivityResult(requestCode: Int, resultCode: Int, @Nullable data: Intent?) {super.onActivityResult(requestCode, resultCode, data)if (requestCode == REQUEST_MEDIA_PROJECTION && data != null) {//            mediaProjection = mediaProjectionManager!!.getMediaProjection(RESULT_OK, data)val mediaPro = mediaProjectionManager!!.getMediaProjection(RESULT_OK, data)val bitmap = screenShot(mediaPro)      //截屏val bs = getBitmapByte(bitmap)//对图片进行处理逻辑  例如可以保存本地、进行图片分享等Log.e("WWW", "EEE" + bitmap)if (bitmap != null) {shareTipsPop.setShare(bitmap)shareTipsPop.showPopupWindow()}}}
d.处理图片的方法：@RequiresApi(api = Build.VERSION_CODES.KITKAT)fun screenShot(mediaProjection: MediaProjection): Bitmap? {val wm1 = this.windowManagerval width = wm1.defaultDisplay.widthval height = wm1.defaultDisplay.heightObjects.requireNonNull(mediaProjection)@SuppressLint("WrongConstant") val imageReader: ImageReader =ImageReader.newInstance(width, height, PixelFormat.RGBA_8888, 60)var virtualDisplay: VirtualDisplay? = nullif (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {virtualDisplay = mediaProjection.createVirtualDisplay("screen",width,height,1,DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,imageReader.getSurface(),null,null)}SystemClock.sleep(1000)//取最新的图片val image: Image = imageReader.acquireLatestImage()// Image image = imageReader.acquireNextImage();//释放 virtualDisplay,不释放会报错virtualDisplay!!.release()return image2Bitmap(image)}@RequiresApi(api = Build.VERSION_CODES.KITKAT)fun image2Bitmap(image: Image?): Bitmap? {if (image == null) {println("image 为空")return null}val width: Int = image.getWidth()val height: Int = image.getHeight()val planes: Array<Image.Plane> = image.planesval buffer: ByteBuffer = planes[0].bufferval pixelStride: Int = planes[0].pixelStrideval rowStride: Int = planes[0].rowStrideval rowPadding = rowStride - pixelStride * widthval bitmap =Bitmap.createBitmap(width + rowPadding / pixelStride, height, Bitmap.Config.ARGB_8888)bitmap.copyPixelsFromBuffer(buffer)//截取图片// Bitmap cutBitmap = Bitmap.createBitmap(bitmap,0,0,width/2,height/2);//压缩图片// Matrix matrix = new Matrix();// matrix.setScale(0.5F, 0.5F);// System.out.println(bitmap.isMutable());// bitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, false);image.close()return bitmap}

3.使用 holder.lockCanvas()：

// 获取SurfaceView
SurfaceView surfaceView = findViewById(R.id.surface_view);
// 获取SurfaceView的Holder对象
SurfaceHolder holder = surfaceView.getHolder();
// 创建Canvas对象
Canvas canvas = holder.lockCanvas();
// 绘制你想要的内容
// ...
// 将Canvas中的内容转换为Bitmap
Bitmap bitmap = Bitmap.createBitmap(canvas.getWidth(), canvas.getHeight(), Bitmap.Config.ARGB_8888);
canvas.setBitmap(bitmap);
// 解锁Canvas并刷新SurfaceView
holder.unlockCanvasAndPost(canvas);
// 至此，你已经成功获取SurfaceView的图片了或者：
// 1. 创建一个与 SurfaceView 大小相同的 Bitmap 对象
val surfaceView: SurfaceView = findViewById(R.id.your_surface_view_id)
val bitmap = Bitmap.createBitmap(surfaceView.width, surfaceView.height, Bitmap.Config.ARGB_8888)// 2. 获取 SurfaceView 的 SurfaceHolder
val surfaceHolder = surfaceView.holder// 3. 锁定 Surface，并将其绘制到 Bitmap 中
var canvas: Canvas? = null
try {canvas = surfaceHolder.lockCanvas(null)canvas?.drawBitmap(bitmap, 0f, 0f, null)
} finally {if (canvas != null) {surfaceHolder.unlockCanvasAndPost(canvas)}
}// 现在，bitmap 中就包含了 SurfaceView 的内容

其他方法不做表述。

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