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

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