Android camera2 判断相机功能是否可控的实例

Android Camera2 可调功能适配

首先获取到设备等级：

Float hardwareLevel = mCameraCharacteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);

LEGACY < LIMITED < FULL < LEVEL_3. 越靠右边权限越大

•INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY = 2
•INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED = 0
•INFO_SUPPORTED_HARDWARE_LEVEL_FULL = 1
•INFO_SUPPORTED_HARDWARE_LEVEL_3 = 3

在相应的等级下面会有各自支持的功能，LEGACY为最低权限

在LIMITED中

Additional capabilities may optionally be supported by a LIMITED-level device, and can be checked for in *android.request.availableCapabilities*.

android.request.availableCapabilities

介绍：List of capabilities that this camera device advertises as fully supporting.

int[] ints = mCameraCharacteristics.get(CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES);

Possible values:

•BACKWARD_COMPATIBLE
•MANUAL_SENSOR
•MANUAL_POST_PROCESSING
•RAW
•PRIVATE_REPROCESSING
•READ_SENSOR_SETTINGS
•BURST_CAPTURE
•YUV_REPROCESSING
•DEPTH_OUTPUT
•CONSTRAINED_HIGH_SPEED_VIDEO

For example manual_semsor:REQUEST_AVAILABLE_CAPABILITIES_MANUAL_SENSOR 
The camera device can be manually controlled (3A algorithms such as auto-exposure, and auto-focus can be bypassed). The camera device supports basic manual control of the sensor image acquisition related stages. This means the following controls are guaranteed to be supported: 
Manual frame duration control 
- android.sensor.frameDuration 
- android.sensor.info.maxFrameDuration 
Manual exposure control 
- android.sensor.exposureTime 
- android.sensor.info.exposureTimeRange 
Manual sensitivity control 
- android.sensor.sensitivity 
- android.sensor.info.sensitivityRange 
Manual lens control (if the lens is adjustable) 
- android.lens.* 
Manual flash control (if a flash unit is present) 
- android.flash.* 
Manual black level locking 
- android.blackLevel.lock 
Auto exposure lock 
- android.control.aeLock 

这些值对应的特征值举例：

final String name3 = CaptureRequest.SENSOR_FRAME_DURATION.getName();
name3 -》android.sensor.frameDuration

列出这个的意思是，如果想知道该设备是否支持此功能，可以通过getName()获取其包名，然后在

mCameraCharacteristics.getAvailableCaptureRequestKeys()；生成的队列中寻找。

如果有匹配则是可控；

CaptureRequest.LENS_FOCUS_DISTANCE；调节焦距
CaptureRequest.CONTROL_AF_MODE；自动对焦模式
CaptureRequest.SENSOR_SENSITIVITY 调节iso
CaptureRequest.CONTROL_AE_MODE 自动曝光模式