如何在Android中使用camera2 判断相机是否可用？针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
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
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