void setDesiredCameraParameters(OpenCamera camera, boolean safeMode) {
Camera theCamera = camera.getCamera();
Camera.Parameters parameters = theCamera.getParameters();
// theCamera.setDisplayOrientation(90);//add 这句代码作用是旋转镜头90度，使相机预览方向正确显示
if (parameters == null) {
Log.w(
TAG,
"Device error: no camera parameters are available. Proceeding without configuration.");
return;
}
Log.i(TAG, "Initial camera parameters: " + parameters.flatten());
if (safeMode) {
Log.w(TAG, "In camera config safe mode -- most settings will not be honored");
}
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
initializeTorch(parameters, prefs, safeMode);
CameraConfigurationUtils.setFocus(parameters, true, true, safeMode);
if (!safeMode) {
CameraConfigurationUtils.setBarcodeSceneMode(parameters);
CameraConfigurationUtils.setVideoStabilization(parameters);
CameraConfigurationUtils.setFocusArea(parameters);
CameraConfigurationUtils.setMetering(parameters);
}
parameters.setPreviewSize(bestPreviewSize.x, bestPreviewSize.y);
theCamera.setParameters(parameters);
theCamera.setDisplayOrientation(cwRotationFromDisplayToCamera);
Camera.Parameters afterParameters = theCamera.getParameters();
Camera.Size afterSize = afterParameters.getPreviewSize();
if (afterSize != null
&& (bestPreviewSize.x != afterSize.width || bestPreviewSize.y != afterSize.height)) {
Log.w(
TAG,
"Camera said it supported preview size "
+ bestPreviewSize.x
+ 'x'
+ bestPreviewSize.y
+ ", but after setting it, preview size is "
+ afterSize.width
+ 'x'
+ afterSize.height);
bestPreviewSize.x = afterSize.width;
bestPreviewSize.y = afterSize.height;
}
}
/** Reads, one time, values from the camera that are needed by the app. */
void initFromCameraParameters(OpenCamera camera) {
Camera.Parameters parameters = camera.getCamera().getParameters();
WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = manager.getDefaultDisplay();
int displayRotation = display.getRotation();
int cwRotationFromNaturalToDisplay;
switch (displayRotation) {
case Surface.ROTATION_0:
cwRotationFromNaturalToDisplay = 0;
break;
case Surface.ROTATION_90:
cwRotationFromNaturalToDisplay = 90;
break;
case Surface.ROTATION_180:
cwRotationFromNaturalToDisplay = 180;
break;
case Surface.ROTATION_270:
cwRotationFromNaturalToDisplay = 270;
break;
default:
// Have seen this return incorrect values like -90
if (displayRotation % 90 == 0) {
cwRotationFromNaturalToDisplay = (360 + displayRotation) % 360;
} else {
throw new IllegalArgumentException("Bad rotation: " + displayRotation);
}
}
Log.i(TAG, "Display at: " + cwRotationFromNaturalToDisplay);
int cwRotationFromNaturalToCamera = camera.getOrientation();
Log.i(TAG, "Camera at: " + cwRotationFromNaturalToCamera);
// Still not 100% sure about this. But acts like we need to flip this:
if (camera.getFacing() == CameraFacing.FRONT) {
cwRotationFromNaturalToCamera = (360 - cwRotationFromNaturalToCamera) % 360;
Log.i(TAG, "Front camera overriden to: " + cwRotationFromNaturalToCamera);
}
cwRotationFromDisplayToCamera =
(360 + cwRotationFromNaturalToCamera - cwRotationFromNaturalToDisplay) % 360;
Log.i(TAG, "Final display orientation: " + cwRotationFromDisplayToCamera);
if (camera.getFacing() == CameraFacing.FRONT) {
Log.i(TAG, "Compensating rotation for front camera");
cwNeededRotation = (360 - cwRotationFromDisplayToCamera) % 360;
} else {
cwNeededRotation = cwRotationFromDisplayToCamera;
}
Log.i(TAG, "Clockwise rotation from display to camera: " + cwNeededRotation);
Point theScreenResolution = new Point();
display.getSize(theScreenResolution);
screenResolution = theScreenResolution;
Log.i(TAG, "Screen resolution in current orientation: " + screenResolution);
cameraResolution = CameraConfigurationUtils.findBestPreviewSizeValue(parameters, new Point());
Log.i(TAG, "Camera resolution: " + cameraResolution);
bestPreviewSize = CameraConfigurationUtils.findBestPreviewSizeValue(parameters, new Point());
Log.i(TAG, "Best available preview size: " + bestPreviewSize);
boolean isScreenPortrait = screenResolution.x < screenResolution.y;
boolean isPreviewSizePortrait = bestPreviewSize.x < bestPreviewSize.y;
if (isScreenPortrait == isPreviewSizePortrait) {
previewSizeOnScreen = bestPreviewSize;
} else {
previewSizeOnScreen = new Point(bestPreviewSize.y, bestPreviewSize.x);
}
Log.i(TAG, "Preview size on screen: " + previewSizeOnScreen);
}