Develop Reference

Tokbox video publish unfocused (Android)

I am using tokbox for video chat and I want to take pictures of printed documents. When I am trying this on a Samsung s7edge my captured image is so unfocused I cannot read it. When I am trying this on a Nexus 6p the image is fine.
It is not a resolution problem, I am always using CameraCaptureResolution.HIGH
any thoughts?

I fixed it:
I used this class:
https://github.com/opentok/opentok-android-sdk-samples/blob/master/Custom-Video-Driver/app/src/main/java/com/tokbox/android/tutorials/customvideodriver/CustomVideoCapturer.java
Changed the init function:
#Override
public void init() {
mCamera = Camera.open(mCameraIndex);
mCurrentDeviceInfo = new Camera.CameraInfo();
Camera.getCameraInfo(mCameraIndex, mCurrentDeviceInfo);
try{
//set camera to continually auto-focus
Camera.Parameters params = mCamera.getParameters();
params.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
mCamera.setParameters(params);
}catch (Exception e) {
e.printStackTrace();
}
}
and the swapCamera as well, so every time the back camera comes into play It must have autofocus.
And in my Activity, onConnected:
CustomVideoCapturer mCapturer = new CustomVideoCapturer(a) ;
mPublisher = new Publisher.Builder(this)
.capturer(mCapturer)
.resolution(Publisher.CameraCaptureResolution.HIGH).build();

OpenCV Library for Android (portrait camera)

I am developing android application with facial recogniton using opencv library. My problem is the screen orientation. I got a solution with code below in JavaCameraView class.
mCamera.setDisplayOrientation(90);
mCamera.setPreviewDisplay(getHolder());
The camera is good but the facial detection doesnt work.
I found this but I think that the solution does not work in latest version of opencv library.
Any ideas could be useful.
Thanks in advance.

You have to also create the setDisplayOrientation by adding this:
protected void setDisplayOrientation(Camera camera, int angle){
Method downPolymorphic;
try
{
downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[] { int.class });
if (downPolymorphic != null)
downPolymorphic.invoke(camera, new Object[] { angle });
}
catch (Exception e1)
{
}
}

Adding camera effects in android and save

I am working on a new android application.In my app i have to add show effects on image preview [like sepia,pinch, mirror, etc] and capture and save image in that particular effect.eg: I f user select pinch effect then he can capture and store the image with pinch effect.
I had read some faq's. But they are telling about some ndk's.But i don't have any idea about ndk's. Please help me friends.

You can set all these kind of effects with camera instance itself. Walk though the below code ...
Camera camera = null;
camera = Camera.open();
if (camera != null) {
try {
Camera.Parameters parameters = camera.getParameters();
// Set all kind of stuffs here..
parameters.setSceneMode(Camera.Parameters.FLASH_MODE_AUTO);
parameters.setColorEffect(Camera.Parameters.EFFECT_SEPIA);
camera.setParameters(parameters);
camera.setPreviewDisplay(surface_holder);
camera.startPreview();
} catch (IOException exception) {
camera.release();
camera = null;
}
}

When Setting Flash Mode for Camera Paramters in zxing set Parameters failed exception in android

I am integrating barcode scanning functionality using zxing in android, my app includes turn on/off flash light functionality by button press.
When the flash button is pressed it sets the flash to mode torch and that parameter is set to be a camera parameter. I got an exception: Set Paramters failed exception.
Here is my code.
Parameters p = camera.getParameters();
List<String> supportedFlashModes =p.getSupportedFlashModes();
if (active)
{
if(supportedFlashModes!= null)
{
if(supportedFlashModes.contains(Parameters.FLASH_MODE_TORCH))
{
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
}
}
CaptureActivity.flashLightON=true;
}
else
{
p.setFlashMode(Parameters.FLASH_MODE_OFF);
}
camera.setParameters(p);
I got the following exception:
06-07 12:15:26.107: E/AndroidRuntime(24642): FATAL EXCEPTION: main
06-07 12:15:26.107: E/AndroidRuntime(24642): java.lang.RuntimeException:
setParameters failed
06-07 12:15:26.107: E/AndroidRuntime(24642): at
android.hardware.Camera.native_setParameters(Native Method)
Please advice me how to resolve this issue?

I had the same problem with my Google Nexus One.
The problem was solved for me by canceling autofocus, set parameters and then reset autofocus
camera.cancelAutoFocus();
camera.setParameters(parameters);
camera.autoFocus(autoFocusCallback);
Unfortunately its not an universal workaround since it does not work for S3 or Galaxy Nexus who totally loses it...
S-G starts to flashes and S3 stop autofocus.
I solved the issue for S3 by stoping preview and then restarting after the parameters were set

I had the same problem, turning the flaslight with the camera on causes some autofocus collision, when setting the parameters at the same time (especially when your autofocus interval is low).
Paste this right before enabling/disabling the flashlight, it will slow down the enabling event, but hey, no crash (not 100% crash proof though).
//sleep time should be long, 3000ms should be enough to prevent crash on some devices, 2000 may by to little (still crashes on Sony Xperia devices) - I have no idea wy this works that way :D
try {
Thread.currentThread().sleep(3000);
}
catch (InterruptedException e) {
e.printStackTrace();
}
Edit:
Better way to solve this problem, is to put your setParameters method in a loop, and catch runtime exception everytime. Exit the loop when there is no exception, or when your (optional) loop counter reaches max value.
final int MAX_TRIES = 100;
boolean success = false;
int triesCounter = 0;
while (!success) {
try {
triesCounter++;
if (triesCounter > MAX_TRIES) {
success = true;
}
parameters = camera.getParameters();
if (parameters != null) {
parameters.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(parameters);
}
success = true;
} catch (Exception exception) {
}
}

Some of the devices do not support and gives such problems. You can refer the link bellow, so that you can get a clear idea about it.
How to turn on camera flash light programmatically in Android?

One solution that works is to create a queue of camera parameters. Setting the torch would add a torch parameter to the queue.
Inside the onAutoFocus callback, call a function that iterates through all of the queue items and commits them. This way you are guaranteed that you are not autofocusing.

turning the flaslight with the camera on/trouch (FLASH_MODE_TORCH)
causes some autofocus collision, when setting the parameters at the
same time (especially when your autofocus interval is low).
I don't like the thread workaround. So I fixed it like this
...
private Boolean _flashOn = null;
...
private Runnable doAutoFocus = new Runnable() {
public void run() {
if (previewing) {
if (_flashOn != null) {
Parameters p = mCamera.getParameters();
if (_flashOn) {
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
}else{
p.setFlashMode(Parameters.FLASH_MODE_OFF);
}
mCamera.setParameters(p);
_flashOn = null;
}
mCamera.autoFocus(autoFocusCB);
}
}
};
No RuntimeException now.
But still has FLASH_MODE_TORCH + autoFocus bug on some adroid devices, e.g. Motorala Milestone/Samsun I9100G/Blahblah...
See also a declined issue for Android: https://code.google.com/p/android/issues/detail?id=14360
BTW. ZBar is faster than ZXing :)

I wanted to start the flash light at the start of scanning and solve it with this.
I have changed in com.google.zxing.client.android.camera method openDriver
Camera theCamera = camera;
if (theCamera == null) {
theCamera = Camera.open();
if (theCamera == null) {
throw new IOException();
}
final Parameters p = theCamera.getParameters();
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
theCamera.setParameters(p);
camera = theCamera;
}
than I have removed from com.google.zxing.client.android.camera.CameraConfigurationManager
initializeTorch(parameters, prefs);
finaly I have changed AndroidManifest.xml
<uses-feature android:name="android.hardware.camera.flash" android:required="true"/>

Try out this code. It worked fine with me.
private void turnOnFlashLight(){
if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA))
{
//Check for Device Camera
Toast.makeText(this, getString(R.string.no_device_camera_msg), Toast.LENGTH_SHORT).show();
flashLightControl.setChecked(false);
return;
}else if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH))
{
//Check for Camera flash
Toast.makeText(this, getString(R.string.no_camera_flash), Toast.LENGTH_SHORT).show();
flashLightControl.setChecked(false);
return;
}else
{
//BIG ISSUE Fash mode is device specific
//Turn On Flash
String _model = android.os.Build.MODEL;
String _manufaturer = android.os.Build.MANUFACTURER;
if((_model.contains("GT-S5830") && _manufaturer.contains("samsung"))) //|| (_manufaturer.contains("lge")))
{
new Thread(new Runnable()
{
#Override
public void run()
{
// TODO Auto-generated method stub
Log.d(TAG, "From TimerTask..!!!");
cameraParams = CameraManager.camera.getParameters();
//cameraParams.setFlashMode(Parameters.FLASH_MODE_TORCH);
cameraParams.set("flash-mode", "on");
CameraManager.camera.setParameters(cameraParams);
CameraManager.camera.startPreview();
isFlash_On_Mode_Device = true;
isLightOn = true;
try{
Thread.sleep(2000);
Log.d(TAG, "From TimerTask After sleep!!!");
cameraParams = CameraManager.camera.getParameters();
cameraParams.setFlashMode(Parameters.FLASH_MODE_OFF);
CameraManager.camera.setParameters(cameraParams);
CameraManager.camera.startPreview();
isLightOn = true;
}
catch(Exception e){}
}
}).start();
}else if(_manufaturer.contains("lge"))
{
//Log.d(TAG, "From LG");
cameraParams = CameraManager.camera.getParameters();
cameraParams.setFlashMode(Parameters.FLASH_MODE_ON);
CameraManager.camera.setParameters(cameraParams);
CameraManager.camera.startPreview();
isLightOn = true;
}
else if(CameraManager.camera != null)
{
cameraParams = CameraManager.camera.getParameters();
//cameraParams.setFlashMode(Parameters.FLASH_MODE_TORCH);
cameraParams.set("flash-mode", "torch");
CameraManager.camera.setParameters(cameraParams);
CameraManager.camera.startPreview();
isLightOn = true;
}
}
private void turnOffFlashLight()
{
if (isLightOn)
{
if(CameraManager.camera != null)
{
if(isFlash_On_Mode_Device)
{
CameraManager.get().closeDriver();
SurfaceHolder surfaceHolder = surfaceView.getHolder();
if (hasSurface)
{
initCamera(surfaceHolder);
if(CameraManager.camera != null)
CameraManager.camera.startPreview();
}
//Log.d(TAG, "Stopping camera..!!!");
}else
{
cameraParams = CameraManager.camera.getParameters();
cameraParams.setFlashMode(Parameters.FLASH_MODE_OFF);
CameraManager.camera.setParameters(cameraParams);
CameraManager.camera.startPreview();
}
isLightOn = false;
isFlash_On_Mode_Device = false;
}
}
}

Use Android Camera without surface View

I'm developing on android, i want to do somethings with camera (process pixels's values), but just in background, is it possible to do it without surface view? just use a buffer to read pixels's values and do processing.
thanks for every one can help me

As of API-Level 11 the SurfaceTexture was added. With it a SurfaceView is no longer needed. I tested the following code with my Samsung Galaxy S3 Neo.
mCamera = Camera.open();
try {
mCamera.setPreviewTexture(new SurfaceTexture(10));
} catch (IOException e1) {
Log.e(Version.APP_ID, e1.getMessage());
}
Parameters params = mCamera.getParameters();
params.setPreviewSize(640, 480);
params.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
params.setPictureFormat(ImageFormat.JPEG);
mCamera.setParameters(params);
mCamera.startPreview();
mCamera.takePicture(null, null, null, new PictureCallback() {
#Override
public void onPictureTaken(byte[] data, Camera camera) {
Log.i(Version.APP_ID, "picture-taken");
}
});

I've been looking for an answer to this for a while. I found it there, copied here for convenience.
http://handycodeworks.com/?p=19
Basically, let's just create a dummy SurfaceView (it works even inside a Service), and use it for Camera functions.
SurfaceView view = new SurfaceView(this);
c.setPreviewDisplay(view.getHolder());
c.startPreview();
c.takePicture(shutterCallback, rawPictureCallback, jpegPictureCallback);