在Android上添加叠加层到相机实时视频的解决方法包括以下步骤:
步骤1:添加权限和依赖项 在AndroidManifest.xml文件中添加以下权限:
在app的build.gradle文件中添加以下依赖项:
implementation 'androidx.camera:camera-camera2:1.1.0-alpha03'
implementation 'androidx.camera:camera-lifecycle:1.1.0-alpha03'
implementation 'androidx.camera:camera-view:1.0.0-alpha24'
implementation 'androidx.camera:camera-core:1.1.0-alpha03'
步骤2:布局文件 在布局文件中添加一个预览视图和一个叠加层视图:
步骤3:创建相机实例 在Activity或Fragment中创建一个相机实例:
private lateinit var camera: Camera
private fun startCamera() {
val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
cameraProviderFuture.addListener(Runnable {
val cameraProvider = cameraProviderFuture.get()
val preview = Preview.Builder().build().also {
it.setSurfaceProvider(previewView.createSurfaceProvider())
}
val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
camera = cameraProvider.bindToLifecycle(this, cameraSelector, preview)
cameraControl = camera.cameraControl
}, ContextCompat.getMainExecutor(this))
}
步骤4:创建叠加层视图 在Activity或Fragment中创建一个叠加层视图:
val overlayView: View = LayoutInflater.from(this).inflate(R.layout.overlay_layout, overlayView, false)
overlayView.visibility = View.VISIBLE
overlayView.alpha = 0.5f
overlayView.setBackgroundColor(Color.RED)
overlayView.setOnClickListener {
// 处理叠加层点击事件
}
overlayView.setOnTouchListener { _, event ->
// 处理叠加层触摸事件
true
}
overlayView.layoutParams = FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT)
overlayView.isClickable = true
overlayView.isFocusable = true
overlayView.requestFocus()
overlayView.setOnKeyListener { _, keyCode, event ->
// 处理叠加层按键事件
false
}
overlayView.setOnLongClickListener {
// 处理叠加层长按事件
true
}
overlayLayout.addView(overlayView)
步骤5:在预览中绘制叠加层 在相机预览中绘制叠加层:
val surfaceTexture = SurfaceTexture(0)
overlayView.surfaceTexture = surfaceTexture
val surface = Surface(surfaceTexture)
val imageReader = ImageReader.newInstance(previewView.width, previewView.height, ImageFormat.RGB_565, 2)
imageReader.setOnImageAvailableListener({ reader ->
val image = reader.acquireLatestImage()
// 在叠加层上绘制图像
val canvas = overlayView.lockCanvas()
canvas.drawBitmap(image.toBitmap(), 0f, 0f, null)
overlayView.unlockCanvasAndPost(canvas)
image.close()
}, null)
cameraSession = camera.cameraControl.startFocusAndMetering(FocusMeteringAction.Builder().setAutoCancelDuration(5, TimeUnit.SECONDS).build())
cameraSession.capture(imageReader.surface, object : CameraCaptureSession.CaptureCallback() {}, null)
通过以上步骤,您可以将叠加层添加到相机实时视频中。请根据您的需求自定义叠加层的样式和逻辑。