可以使用CameraCompat库来实现向后兼容性。

示例代码：

//创建CameraDevice.StateCallback作为摄像机设备打开的回调 private CameraDevice.StateCallback mCameraDeviceStateCallback = new CameraDevice.StateCallback() { @Override public void onOpened(CameraDevice cameraDevice) { //初始化相机设备。 mCameraDevice = cameraDevice; //启动预览 startPreview(); } ... };

//打开摄像机设备方法 private void openCamera() { CameraManager cameraManager = (CameraManager)getSystemService(Context.CAMERA_SERVICE); try { //获取支持向后兼容性的摄像机ID列表 String[] cameraIdList = cameraManager.getCameraIdList(); ArrayList backwardCompatibleCameraIdList = new ArrayList<>(); for (String cameraId : cameraIdList) { CameraCharacteristics cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId); if (CameraCompat.isBackwardCompatible(cameraCharacteristics)) { backwardCompatibleCameraIdList.add(cameraId); } } //选择第一个向后兼容的相机 String cameraId = backwardCompatibleCameraIdList.get(0); //使用与打开后兼容相机的相同回调打开相机设备。 cameraManager.openCamera(cameraId, mCameraDeviceStateCallback, null); } catch (CameraAccessException e) { e.printStackTrace(); } }

//在启动预览时使用CameraCompat帮助类检查向后兼容性 private void startPreview() { try { //通过ImageReader获得Surface。 ImageReader imageReader = ImageReader.newInstance(mPreviewSize.getWidth(), mPreviewSize.getHeight(), ImageFormat.YUV_420_888, 2); Surface surface = imageReader.getSurface(); //创建一个CaptureRequest.Builder CaptureRequest.Builder builder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW); //设置目标应用程序Surface builder.addTarget(surface); //使用CameraCompat帮助类确定是否应