android.hardware.camera2.CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY源码实例Demo

@RequiresApi(21)
public static int getLowestSupportedHardwareLevel(@NonNull Context context) {
  @SuppressLint("RestrictedApi") CameraManager cameraManager = CameraManagerCompat.from(context).unwrap();

  try {
    int supported = maxHardwareLevel();

    for (String cameraId : cameraManager.getCameraIdList()) {
      CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraId);
      Integer               hwLevel         = characteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);

      if (hwLevel == null || hwLevel == CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY) {
        return CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY;
      }

      supported = smallerHardwareLevel(supported, hwLevel);
    }

    return supported;
  } catch (CameraAccessException e) {
    Log.w(TAG, "Failed to enumerate cameras", e);

    return CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY;
  }
}
 

static int getCaptureApiType(int id) {
    final CameraCharacteristics cameraCharacteristics = getCameraCharacteristics(id);
    if (cameraCharacteristics == null) {
        return VideoCaptureApi.UNKNOWN;
    }

    final int supportedHWLevel =
            cameraCharacteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);
    switch (supportedHWLevel) {
        case CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY:
            return VideoCaptureApi.ANDROID_API2_LEGACY;
        case CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_FULL:
            return VideoCaptureApi.ANDROID_API2_FULL;
        case CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED:
            return VideoCaptureApi.ANDROID_API2_LIMITED;
        default:
            return VideoCaptureApi.ANDROID_API2_LEGACY;
    }
}
 

@RequiresApi(21)
private static int smallerHardwareLevel(int levelA, int levelB) {

  int[] hardwareInfoOrdering = getHardwareInfoOrdering();
  for (int hwInfo : hardwareInfoOrdering) {
    if (levelA == hwInfo || levelB == hwInfo) return hwInfo;
  }

  return CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY;
}
 

@RequiresApi(21)
public static boolean isMixedModeSupported(@NonNull Context context) {
  return getLowestSupportedHardwareLevel(context) != CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY;
}
 

static boolean isLegacyDevice(int id) {
    final CameraCharacteristics cameraCharacteristics = getCameraCharacteristics(id);
    return cameraCharacteristics != null
            && cameraCharacteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL)
            == CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY;
}