android.hardware.camera2.CameraAccessException#CAMERA_ERROR源码实例Demo

@SuppressLint("SwitchIntDef")
@Override
public String getErrorString(CameraAccessException e) {
    String errorMessage;
    switch (e.getReason()) {
        case CameraAccessException.CAMERA_DISABLED:
            errorMessage = getString(R.string.camera_disabled);
            break;
        case CameraAccessException.CAMERA_DISCONNECTED:
            errorMessage = getString(R.string.camera_disconnected);
            break;
        case CameraAccessException.CAMERA_ERROR:
            errorMessage = getString(R.string.camera_error);
            break;
        default:
            errorMessage = getString(R.string.camera_unknown, e.getReason());
            break;
    }
    return errorMessage;
}
 

private void checkIfCameraClosedOrInError() throws CameraAccessException {
    if (mRemoteDevice == null) {
        throw new IllegalStateException("CameraDevice was already closed");
    }
    if (mInError) {
        throw new CameraAccessException(CameraAccessException.CAMERA_ERROR,
                "The camera device has encountered a serious error");
    }
}
 

/** Fetches the camera characteristics for the current camera. */
private boolean initCameraCharacteristics() {
  CameraManager manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
  try {
    // Extract characteristics for the current camera.
    CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);

    activeArraySize = characteristics.get(SENSOR_INFO_ACTIVE_ARRAY_SIZE);
    maxDigitalZoom = characteristics.get(SCALER_AVAILABLE_MAX_DIGITAL_ZOOM);

    // Require a stream configuration map. Don't know why there wouldn't be one.
    StreamConfigurationMap map = characteristics.get(
        CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
    if (map == null) {
      throw new CameraAccessException(CameraAccessException.CAMERA_ERROR);
    }

    int facing = characteristics.get(CameraCharacteristics.LENS_FACING);
    boolean lensFacingFront = (facing == CameraCharacteristics.LENS_FACING_FRONT);
    int sensorOrientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
    outputOrientation = Orientation.getOutputOrientation(
        lensFacingFront, displayRotationCode, sensorOrientation);

    return true;
  } catch (CameraAccessException | NullPointerException e) {
    // NPE's can be thrown when unboxing some of the characteristics. This should never happen
    // on Pixel{1,2}.
    Log.w(TAG, "Failed to inspect camera characteristics", e);
  }
  return false;
}