Develop Reference

camera2 : Problems with focused area and focus distance

I tried many time to set a distance focus on camera2 API, or set autofocus just on a specific area initialized at the start of the activity.
But it still not working...
Could you help me please ? :)
here is my configuration :
captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CaptureRequest.CONTROL_MODE_AUTO);
captureRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
CaptureRequest.CONTROL_AF_TRIGGER_START);
MeteringRectangle[] focusArea = new MeteringRectangle[1];
focusArea[0] = new MeteringRectangle(new Rect(rectangle.getLeft(),rectangle.getTop(),
rectangle.getRight(), rectangle.getBottom()), MeteringRectangle.METERING_WEIGHT_MAX);
captureRequestBuilder.set(CaptureRequest.CONTROL_AF_REGIONS, focusArea);
//captureRequestBuilder.set(CaptureRequest.LENS_FOCUS_DISTANCE,10000000000.0f);

You don't include the code where you call either CameraCaptureSession.capture or setRepeatingRequest. But you should not set TRIGGER_START in a repeating request, since that'll restart focus on every frame. Only use it in a single capture() call.
Also, did you mean you change CONTROL_AF_MODE, not CONTROL_MODE? The latter doesn't affect the type of autofocus used, and I'm assuming you want to do AF_MODE_AUTO for a touch-to-focus operation.
If you want manual focus, you'd need to set AF_MODE_OFF to disable autofocus.

Android Camera2 API manual exposure change

According to offical google team statement the CONTROL_AE_EXPOSURE_COMPENSATION manual change is broken on Android 5.1. I'm lookin for a workaround for couple of days and the only one I found is connected to SENSOR_INFO_SENSITIVITY_RANGE. However, I found some difficulties in using it. My code look like this:
if(!modeDisabled){
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF);
modeDisabled=true;
}
range1 = characteristics.get(CameraCharacteristics.SENSOR_INFO_SENSITIVITY_RANGE);
minmin = range1.getLower();
maxmax = range1.getUpper();
int iso = ((i * (maxmax - minmin)) / 100 + minmin);
mPreviewRequestBuilder.set(CaptureRequest.SENSOR_SENSITIVITY, iso);
mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), null, mBackgroundHandler);
Of course the 'i' value is a progress value taken from the seekbar and everyting is closed in OnProgressChanged function.
The problem is that there are no visible changes when manipulating the seekbar. I'd be really gratetful for any help.

CONTROL_AE_EXPOSURE_COMPENSATION isn't broken in Android 5.1 in general, it was disabled on the Nexus 6 only (and will be re-enabled in a future update).
If you're disabling auto-exposure, you probably also need to set the exposure time, in addition to the sensitivity. You also preferably need to set the frame duration, though the defaults for both are probably 1/30s, which is reasonable. You can also copy the latest values for those from the most-recent capture result that did you auto-exposure.
That said, you should still see some sort of change here. Is it possible that you're overwriting your capture request elsewhere right after you set this one as the repeating request? You can check the returned capture results to see what the sensitivity setting the camera device is receiving is.

Android Camera: fixed lens focus

I'm developing an Android application with a camera-related functionality feature.
First of all, I read a lot of stuff on SO, XDA and so on, then please don't redirect me to other useless posts.
I am trying to implement something like a "fixed focus mode", so that:
I start my application with FOCUS_MODE_AUTO (or something else);
bring into focus an object at an arbitrary distance;
fix the current focus;
move the camera on another object at a different distance which is out of focus.
I tried different solutions, i.e.:
mCamera.cancelAutoFocus() in the AutoFocusCallback to prevent the adjustment of the focus;
set a FocusArea: new Camera.Area(new Rect(-50, -50, 50, 50), 1000) to fix the focus on the current area.
I'm targeting API 20 and I'm working on a Samsung Galaxy S5. On this device, the supported focus modes are:
- auto
- infinity
- macro
- continuous-video
- continuous-picture
The suggestion that I found more frequently is to recompile Android...

"AUTO" mode doesn't mean that the camera continuously focuses - just that when you call the autoFocus command the focus is done automatically with no indication on what result you expect not like "Macro" or "Infinity".
http://developer.android.com/reference/android/hardware/Camera.html#autoFocus(android.hardware.Camera.AutoFocusCallback)
So if you don't have a loop that calls the autoFocus (as many examples do or call it again in the Callback) your focus should stay after it runs once.

If I understand, you want to focus keep the focus of the first object.
Have you tried to change the camera mode to FOCUS_MODE_FIXED after you focus the first object ?
Like that :
Camera.Parameters mParam = mCamera.getParameters();
mParam.setFocusMode(Camera.Parameters.FOCUS_MODE_FIXED);
mCamera.setParameters(mParam);

Turn off auto focus in android

It is any way to turn off auto focus in camera in code my application. I want to check how my scanner work if phone has no auto focus, but in my phone I have that function.

Use FOCUS_MODE_INFINITY or FOCUS_MODE_FIXED. You can also use FOCUS_MODE_MACRO, but that will require holding your phone quite close to the object you're scanning.
On a second thought, the word 'scanner' evokes thoughts of barcodes and QR codes, so unless you print them as full-size page, you actually might be better off with FOCUS_MODE_MACRO.
You can set the desired focus mode with Camera.Parameters.setFocusMode() when opening your camera.

You Can use mCamera.cancelAutoFocus();
Also if you want to set Macro or another Focus Mode, you shall write:
Camera.Parameters mParam = mCamera.getParameters();
mParam.setFocusMode(Camera.Parameters.FOCUS_MODE_MACRO);
mCamera.setParameters(mParam);
All the focus mode and Camera parameters are availble here:

Android Camera.takePicture - Possible to disable shutter sound and preview surface?

I am working on an app that will allow a user to take quick click and forget snapshots. Most of the app is done except for the camera working that way I would like. Right now I have the camera working but I can't seem to find a way to disable the shutter sound and I cant find a way to disable displaying the preview. I was able to cover the preview up with a control but I would rather just not have it displayed if possible.
To sum things up, these are the items that I would like to disable while utilizing the built in Camera controls.
Shutter sound
Camera screen display
Image preview onPictureTaken
Does anyone know of a resource that could point me in the right direction, I would greatly appreciate it. I have been following CommonsWare's example from this sample fairly closely.
Thank you.

This is actually a property in the build.prop of a phone. I'm unsure if its possible to change this. Unless you completely override it and use your own camera code. Using what you can that is available in the SDK.
Take a look at this:
CameraService.cpp
. . .
CameraService::Client::Client(const sp<CameraService>& cameraService,
const sp<ICameraClient>& cameraClient,
const sp<CameraHardwareInterface>& hardware,
int cameraId, int cameraFacing, int clientPid) {
mPreviewCallbackFlag = FRAME_CALLBACK_FLAG_NOOP;
mOrientation = getOrientation(0, mCameraFacing == CAMERA_FACING_FRONT);
mOrientationChanged = false;
cameraService->setCameraBusy(cameraId);
cameraService->loadSound();
LOG1("Client::Client X (pid %d)", callingPid)
}
void CameraService::loadSound() {
Mutex::Autolock lock(mSoundLock);
LOG1("CameraService::loadSound ref=%d", mSoundRef);
if (mSoundRef++) return;
mSoundPlayer[SOUND_SHUTTER] = newMediaPlayer("/system/media/audio/ui/camera_click.ogg");
mSoundPlayer[SOUND_RECORDING] = newMediaPlayer("/system/media/audio/ui/VideoRecord.ogg");
}
As can be noted, the click sound is started without your interaction.
This is the service used in the Gingerbread Source code.
The reason they DON'T allow this is because it is illegal is some countries. Only way to achieve what you want is to have a custom ROM.
Update
If what being said here: http://androidforums.com/t-mobile-g1/6371-camera-shutter-sound-effect-off.html
still applies, then you could write a timer that turns off the sound (Silent Mode) for a couple of seconds and then turn it back on each time you take a picture.

You may use the data from the preview callback using a function to save it at a picture on some type of trigger such as a button, using onclick listener. you could compress the image to jpeg or png. In this way, there no shutterCallback to be implemented. and therefore you can play any sound you want or none when taking a picture.

You can effectively hide the preview surface by giving it dimensions of 1p in the xml file (I found an example the said 0p but for some reason that was giving me errors).
It may be illegal to have a silent shutter in some places, but it doesn't appear that the US is such a place, as my HTC One gives me an option to silence it, and in fact, since Android 4.2 you can do this:
Camera.CameraInfo info=new Camera.CameraInfo();
if (info.canDisableShutterSound) {
camera.enableShutterSound(false);
}