The camera on the surface view I implemented was rotated 90 degrees anti-clockwise at the start. I used the following code to make it erect.
if (activity.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
camera.setDisplayOrientation(90);
}
This is working fine on most of the devices but some still have the same issue.
I've also tried the code given on the android dev page but in vain.
How can this be rectified? Some of the devices still having this issue are Moto G5 and Honor 9N
Related
I have created a camera app and using the data to do something .But the data is always in landscape mode .
I have tried this which is making the preview in portrait mode but the byte[] I am getting still gives me a landscape photo.
public void surfaceCreated(SurfaceHolder holder) {
mCamera = Camera.open();
mCamera.setDisplayOrientation(90);
I know I can make it as a bitmap and rotate it 90 but I need only the data from onPictureTaken.
I also tried
param.setRotation(90);
Which is not working on some of the devices.
You are right, this is how camera API works (unlike iOS). There are some efficient methods that can rotate the pixels to portrait if you really need this, but they never come at 0 cost. So the best practice is to adjust your code that processes the arriving preview frames.
So I am making an application where you can take some pictures.
I had everything working as it should besides of the PictureSize.
After you take a picture, the preview is supposed to freeze with the last image taken, just like TakePhoto usually do for you. This works as it should until i do parameters.setPictureSize in this method:
public void setupCameraParameters() {
Camera.Parameters parameters = mCamera.getParameters();
Camera.Size preSize = determineBestPreviewSize(parameters);
Camera.Size picSize = determineBestPictureSize(parameters);
parameters.setPreviewSize(preSize.width, preSize.height);
parameters.setPictureSize(picSize.width, picSize.height);
parameters.setRotation(90);
mCamera.setParameters(parameters);
}
This gives my pictures the correct sizes, however what happends now is that my preview doesn't freeze after TakePhoto is called, it just keeps feeding from my camera.
I have even tried doing mCamera.stopPreviewing() without any freezing images. If i release the camera, the image gets black as it should do so I really am working on the right camera-instance as well.
Is there any documentation I have missed? Have someone else entered this problem before.
EDIT:
So I got back my xperia z3 compact from repair and checked this issue again. On z3 this never is an issue, the code will take a picture and then freeze the preview like I want it to. My other phone was a HTC one (m7).
In my current application, I've got a class holding an instance of a Camera object and trying to do the following:
1) Wait for a specified time, e.g. nothing (this is done via a TimerTask)
2) Request to focus via autoFocus
3) In autoFocus callback, request OneShotPreviewCallback
4) In preview callback, save image
5) Repeat
While the white balancing is working fine prior to the first autoFocus, it stops after the first focussing has been done. Well, of course I looked up the API, and there is one interesting statement in the autoFocus description.
But auto-focus routine may stop auto-exposure and auto-white balance transiently during focusing.
But it seems it is non stopped only transiently, but permantly. Funny enough, with the subsequent call of autoFocus, the camera tries to ajust the whitening again, but the correct value is mostly only with the second or third autoFocus.
I also tried to set the white balancing in code, but it didn't change anything.
setWhiteBalance(Camera.Parameters.WHITE_BALANCE_AUTO);
Does anyone else know this issue, or am I missing some point ? I know that I could permanently call autoFocus to force the white balancing, but that doesn't seem the optimal way for me, because prior to the first call auf autoFocus, it works perfectly fine.
P.S.: I'm testing on a Samsung Galaxy S2 with Android 4.0.3.
I have ran into similar issue on Samsung Galaxy 2 Duos 2. In this case, the auto exposure settings have stopped working instead of the WB. I tried to cycle (on/off) the auto exposure param and it worked for me.
mCamera.autoFocus(new Camera.AutoFocusCallback() {
#Override
public void onAutoFocus(boolean b, Camera camera) {
Camera.Parameters params = camera.getParameters();
if (params.isAutoExposureLockSupported()) {
params.setAutoExposureLock(true);
camera.setParameters(params);
params = camera.getParameters();
params.setAutoExposureLock(false);
camera.setParameters(params);
}
}
});
I've got the similar problem on Samsung Galaxy Ace - after first autofocus, camera white balancing turns off and does not turn on again, no matter how much I do autofocus after.
As there are no API methods to tell camera to resume white balancing, and resetting the camera parameters in autofocus callback doesn't do the trick, my guess is that it is a bug in camera driver in Samsung phones - I've tried my application with different phones and only on this Samsung Galaxy Ace (GT-S5830; updated to Android 2.3.3), camera white balancing does not resume after autofocusing.
Maybe we should issue a bug ticket on developer.samsung.com?
It seems that
mCamera.stopPreview();
mCamera.startPreview();
in AutoFocusCallback can enable auto exposure again, but bringing a very short pause on the preview as side effect.
I am writing an app that sets the flash mode to torch. I have been testing the application on my Droid X, and the LED light does not come on. I tried it on a Droid Incredible and it worked fine. I can't figure out what the problem is. Here is part of my code for turning on torch mode.
Camera mCamera = Camera.open();
Camera.Parameters params = mCamera.getParameters();
if(params.getFlashMode() != null){
params.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
}
mCamera.setParameters(params);
I have added mCamera.startPreview(); because I read that should make a difference, but it doesn't. I also made a list of available flash modes and displayed them to the screen to make sure that my Droid X does have torch mode, and it was in the list. I even created a new application from code I found online that turns the LED flash on and off with a button. Again it worked fine on the Droid Incredible but not the Droid X. Is there something I am missing to get this to run on the Droid X, or could it be something with Gingerbread? The Droid X is running Gingerbread and the Droid Incredible is running FroYo.
There are quite a few quirks when setting FLASH_MODE_TORCH.
Often you need to start a camera preview:
Camera mCamera = Camera.open();
mCamera.startPreview();
Camera.Parameters params = mCamera.getParameters();
if(params.getFlashMode() != null){
params.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
}
mCamera.setParameters(params);
That may resolve it on some phones, other phones also require the preview to be drawn to a SurfaceView. This can be done by implementing SurfaceHolder.Callback interface in your activity.
See an example here.
It could be that the Droid X doesn't support Torch Mode. Try something like this:
List<String> pList = camera.getParameters().getSupportedFlashModes();
if (pList.contains(Parameters.FLASH_MODE_TORCH))
parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(parameters);
Refer to Issue 191453:
SurfaceTexture mDummy = new SurfaceTexture(1); // any int argument will do
camera.setPreviewTexture(mDummy);
camera.startPreview();
The only thing I found that works on the Droid X is the code presented by Siddhpura Amit part way down the page in this answer Use camera flashlight in Android. He checks the manufacturer and checks to see if it contains the string "motorola." If so, he has special code that can switch the camera Flash LED on or off. I can verify that it does work as I have a Motorola Droid X.
I'm trying to develop an app which uses the Camera. So far it's been working well, except that I'm unable to force the orientation to be "portrait". It seems to work well if I force all activities to "landscape", because the camera preview seems to fit in landscape.
Is there anyway to use the Camera in portrait mode?
Android devices v2.2 and above contain and API to rotate the display to portrait. Devices below 2.2 are landscape only. Your best bet is to detect if the device is 2.2 and rotate 90 degrees. Fall back on landscape for devices under 2.2. The good news is most Android devices are on 2.2 and above.
Check out my answer here for more info:
Camera is wrong unless keyboard is open
public void surfaceCreated(SurfaceHolder holder)
{
// The Surface has been created, acquire the camera and tell it where to draw.
mCamera = Camera.open();
Parameters params = mCamera.getParameters();
if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE)
{
params.set("orientation", "portrait");
mCamera.setDisplayOrientation(90);
}
try
{
mCamera.setPreviewDisplay(holder);
}
catch (IOException exception)
{
mCamera.release();
mCamera = null;
}
}
edit: I was in the midst of Adobe AIR for Android development when I answered this question, and looking back at it, I realize this question didn't pertain to Adobe AIR.
Adobe says:
On devices that can change the screen orientation, such as mobile phones, a Video object attached to the camera will only show upright video in a landscape-aspect orientation. Thus, mobile apps should use a landscape orientation when displaying video and should not auto-rotate.
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/media/Camera.html
If you do really want to use the camera in portrait mode, my suggestion is to rotate the video object.
Here's some sample code that rotates the video object (_video) by an angle in degrees (source was pulled from elsewhere on stackoverflow):
var matrix:Matrix = _video.transform.matrix;
var rect:Rectangle = _video.getBounds(this);
matrix.translate(- (rect.left + (rect.width/2)), - (rect.top + (rect.height/2)));
matrix.rotate((angle/180)*Math.PI);
matrix.translate(rect.left + (rect.width/2), rect.top + (rect.height/2));
_video.transform.matrix = matrix;