有没有做网站的博士专业,网站推广系统,网站设计建设价格,外贸网站建设的意义在Android设备中#xff0c;做预览拍照的需求的时候#xff0c;我们会指定
CameraSelector DEFAULT_FRONT_CAMERA前置
或者后置CameraSelector DEFAULT_BACK_CAMERA
如果你使用的是平板或者工业平板#xff0c;那么就会遇到多摄像头以及外置摄像头问题#xff0c;简单的指… 在Android设备中做预览拍照的需求的时候我们会指定
CameraSelector DEFAULT_FRONT_CAMERA前置
或者后置CameraSelector DEFAULT_BACK_CAMERA
如果你使用的是平板或者工业平板那么就会遇到多摄像头以及外置摄像头问题简单的指定前后置是不行的哪怕是USB 外置也有挂载两个的情况 本文就是写于两个外置的特殊情况作为验证所以我们必须能获取所有可用的摄像头我们以最新的预览拍照控件为例 单摄像头推荐PreviewViewCameraSelector 与挂载的位置相关 且绑定了activity lifecycle 多摄像头推荐SurfaceviewCameraId 与id相关 surfaceview方式获取id在下面
PreviewView
为例初始化的时候需要使用
CameraSelector去绑定拍照的UseCase MainThreadNonNullpublic Camera bindToLifecycle(NonNull LifecycleOwner lifecycleOwner,NonNull CameraSelector cameraSelector,NonNull UseCase... useCases) {if (getCameraOperatingMode() CAMERA_OPERATING_MODE_CONCURRENT) {throw new UnsupportedOperationException(bindToLifecycle for single camera is not supported in concurrent camera mode, call unbindAll() first);}setCameraOperatingMode(CAMERA_OPERATING_MODE_SINGLE);Camera camera bindToLifecycle(lifecycleOwner, cameraSelector, null, emptyList(),useCases);return camera;}
因为我们需要获取所有可用的摄像头类似旧版的CameraId
将下面代码放入activity获取 val cameraProviderFuture ProcessCameraProvider.getInstance(this)cameraProviderFuture.addListener({LogUtils.log(摄像头结果返回)val cameraProvider cameraProviderFuture.get()var textC val cameraInfos cameraProvider.availableCameraInfosvar isSupportBack falsevar isSupportFront falsevar isExternal falsevar isUnknow falsefor (cameraInfo in cameraInfos) {when (cameraInfo.lensFacing) {CameraSelector.LENS_FACING_FRONT - {isSupportFront truetextC \n前置 lensFacing:[${cameraInfo.lensFacing},${cameraInfo.cameraSelector}]}CameraSelector.LENS_FACING_BACK - {isSupportBack truetextC \n后置 lensFacing:[${cameraInfo.lensFacing},${cameraInfo.cameraSelector}]}CameraSelector.LENS_FACING_EXTERNAL - {isExternal truetextC \n外置 lensFacing:[${cameraInfo.lensFacing},${cameraInfo.cameraSelector}]}CameraSelector.LENS_FACING_UNKNOWN - {isUnknow truetextC \n未知 lensFacing:[${cameraInfo.lensFacing},${cameraInfo.cameraSelector}]}}}LogUtils.logI(init,设备支持情况后置:${isSupportBack},前置:${isSupportFront},外置:${isExternal},未知:${isUnknow})binding.tvCheckResult.text len:$textC\n 设备支持情况后置:${isSupportBack},前置:${isSupportFront},外置:${isExternal},未知:${isUnknow}}, ContextCompat.getMainExecutor(this))
工业平板做的产品摄像头一般固定获取之后指定即可也可以自己编辑优先级逻辑下面是插两个摄像头的例子 可以使用上述打印的具体摄像头推荐 也可以自己bulid自己build有局限性比如两个外置你使用2去build就不行了 val selector: CameraSelector if (isSupportBack) {CameraSelector.DEFAULT_BACK_CAMERA} else if (isSupportFront) {CameraSelector.DEFAULT_FRONT_CAMERA} else if (isExternal) {CameraSelector.Builder().requireLensFacing(2).build()} else if (isUnknow) {CameraSelector.Builder().requireLensFacing(1).build()} else {CameraSelector.DEFAULT_BACK_CAMERA} // 如果你使用的是surfaceviewcameraId 而且是多预览 val cameraManager activity.getSystemService(AppCompatActivity.CAMERA_SERVICE) as CameraManagerval cameraIds cameraManager.cameraIdListfor (cameraId in cameraIds) {val characteristics cameraManager.getCameraCharacteristics(cameraId)val facing characteristics.get(CameraCharacteristics.LENS_FACING)}
明确了cameraId 其他通过预览的示例代码 我也传一下吧由于每个摄像头是独立 有多少个预览就new多少个出来
class CameraUtils {val TAG CameraUtilsprivate var mCameraDevice: CameraDevice? nullprivate var mCaptureSession: CameraCaptureSession? nullprivate var mPreviewBuilder: CaptureRequest.Builder? nullfun bindSurfaceView(activity: Activity,surfaceView: SurfaceView,len: Int,cId: String?): String {val cameraManager activity.getSystemService(AppCompatActivity.CAMERA_SERVICE) as CameraManagersurfaceView.holder.setFixedSize(9999, 9999)LogUtils.logI(TAG, bindSurfaceView)val cameraId cId ?: getCameraId(cameraManager, len)try {LogUtils.log(len:$len cameraId:$cameraId)if (TextUtils.isEmpty(cameraId)) {LogUtils.logE(TAG, cameraId null)return cameraId null}if (ActivityCompat.checkSelfPermission(activity,Manifest.permission.CAMERA) ! PackageManager.PERMISSION_GRANTED) {LogUtils.logE(TAG, 没有权限)return 没有权限}cameraManager.openCamera(cameraId!!, object : CameraDevice.StateCallback() {override fun onOpened(camera: CameraDevice) {LogUtils.logE(TAG, onOpened cameraId:$cameraId)mCameraDevice cameracreateCaptureSession(camera, surfaceView)}override fun onDisconnected(camera: CameraDevice) {LogUtils.logE(TAG, onDisconnected cameraId:$cameraId)}override fun onError(camera: CameraDevice, error: Int) {LogUtils.logE(TAG, onError:$error cameraId:$cameraId)}}, null)} catch (e: CameraAccessException) {e.printStackTrace()LogUtils.logE(TAG, onError:$e)return onError:$e}return cameraId:$cameraId}/*** 创建CaptureSession*/private fun createCaptureSession(camera: CameraDevice, surfaceView: SurfaceView) {try {surfaceView.run {val surfaceHolder: SurfaceHolder getHolder()surfaceHolder.setFixedSize(getWidth(), getHeight())val surfaces: MutableListSurface ArrayList()surfaces.add(surfaceHolder.surface)mPreviewBuilder camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)mPreviewBuilder?.addTarget(surfaceHolder.surface)camera.createCaptureSession(surfaces,object : CameraCaptureSession.StateCallback() {override fun onConfigured(session: CameraCaptureSession) {mCaptureSession sessionupdatePreview()}override fun onConfigureFailed(session: CameraCaptureSession) {// 配置会话失败}},null)}} catch (e: CameraAccessException) {e.printStackTrace()}}private fun updatePreview() {if (mCameraDevice null) {LogUtils.logE(TAG, mCameraDevice null)return}if (mCaptureSession null) {LogUtils.logE(TAG, mCaptureSession null)return}if (mPreviewBuilder null) {LogUtils.logE(TAG, mPreviewBuilder null)return}LogUtils.logI(TAG, updatePreview.)try {mCaptureSession?.setRepeatingRequest(mPreviewBuilder!!.build(), null, null)} catch (e: Exception) {e.printStackTrace()LogUtils.logE(TAG, updatePreview: $e)}}Throws(CameraAccessException::class)private fun getCameraId(cameraManager: CameraManager, len: Int): String? {val cameraIds cameraManager.cameraIdListfor (cameraId in cameraIds) {val characteristics cameraManager.getCameraCharacteristics(cameraId)val facing characteristics.get(CameraCharacteristics.LENS_FACING)// CameraCharacteristics.LENS_FACING_BACK CameraCharacteristics.LENS_FACING_FRONTif (facing ! null facing len) {return cameraId}}return null}}
比如用RecyclerView 多个item预览 可以这样初始化 fun getOneUtils(index: Int): CameraUtils {var cache mCameraUnitsMap[index]if (cache null) {cache CameraUtils()mCameraUnitsMap[index] cache}return cache}
使用 val text getOneUtils(position).bindSurfaceView(thisCameraInfoActivity,holder.getView(R.id.surfaceView),len, cameraId)
如果是uniapp同学需要买相关插件的可以留言联系
