setPreviewSize() bug in Android? - android

I have the following code in my app:
camera = Camera.open(CameraInfo.CAMERA_FACING_FRONT);
Camera.Parameters setting_param = camera.getParameters();
setting_param.setPreviewSize(128,128);
camera.setParameters(setting_param);
Camera.Parameters read_param = camera.getParameters();
Camera.Size sz = read_param.getPreviewSize();
The code works exactly as expected on my galaxy tab 10.1 running Android 3.1. but on My Galaxy S II phone running 4.1.2, the width and height of the preview, i.e. sz.width and sz.height are 640 and 480! Is this a bug in 4.1.2, or a consequence of an error of mine I am getting away with in 3.1 and not getting away with in 4.1.2?

Before setting a preview size you should check if that preview size is supported.
You have a method on Camera called getSupportedPreviewSizes which will return you a list of supported preview sizes.

Mick, you should check if a preview size is supported by camera before setting it. Change your onSurfaceChanged method a bit like following.
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
Camera.Parameters mParameters = mCamera.getParameters();
Camera.Size bestSize = null;
List<Camera.Size> sizeList = mCamera.getParameters().getSupportedPreviewSizes();
bestSize = sizeList.get(0);
for(int i = 1; i < sizeList.size(); i++){
if((sizeList.get(i).width * sizeList.get(i).height) >
(bestSize.width * bestSize.height)){
bestSize = sizeList.get(i);
}
}
mParameters.setPreviewSize(bestSize.width, bestSize.height);
mCamera.setParameters(mParameters);
mCamera.startPreview();
//any other code ....
}

Related

SurfaceView setVisibility() throws RuntimeException

I'm facing following problem. I'm using SurfaceView to show Camera preview, but when I set surface view to visible, I get following exception.
java.lang.RuntimeException: getParameters failed (empty parameters)
at android.hardware.Camera.native_getParameters(Native Method)
at android.hardware.Camera.getParameters(Camera.java:1460)
at com.the.package.activity.ShowPhotoActivity$2.surfaceChanged(ShowPhotoActivity.java:111)
at android.view.SurfaceView.updateWindow(SurfaceView.java:558)
at android.view.SurfaceView.setVisibility(SurfaceView.java:248)
ShowPhotoActivity:
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Camera.Parameters parameters = mCamera.getParameters(); // <-- line 101
Camera.Size size = getBestPreviewSize(width, height, parameters);
if (mInPreview) {
mCamera.stopPreview();
}
Display display = ((WindowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
if (display.getRotation() == Surface.ROTATION_0) {
mCamera.setDisplayOrientation(90);
parameters = mCamera.getParameters(); // <---- line 111
size = getBestPreviewSize(width, height, parameters);
}
if (display.getRotation() == Surface.ROTATION_270) {
mCamera.setDisplayOrientation(180);
parameters = mCamera.getParameters();
size = getBestPreviewSize(width, height, parameters);
}
Camera.Size s = getBestResolution(parameters);
parameters.setPreviewSize(size.width, size.height);
parameters.setPictureSize(s.width, s.height);
mCamera.setParameters(parameters);
if (mInPreview) {
mCamera.startPreview();
}
}
It really drives me crazy, why line 101 is processed with no problem and line 111 throws exception. This happens only on device Sony st26i (Xperia J) with Android 4.1.1. I haven't noticed any problems on Galaxy Nexus, Galaxy SIII or 4.1.2 emulator. Thanks for every idea.
It has been answered over here, check the accepted answer:
Correct handling of exception: "getParameters failed (empty parameters)"
My guess is that stopPreview here is problematic, potentially called from the wrong thread. Check your logs around the time you call stopPreview, it might give you a clue.

How come that a camera preview in a textureview is much more fuzzy than in a surfaceview?

I have found out that when using a textureview instead of a surfaceview as a camera preview (both hooked up to the camera via a mediarecorder) then the preview is much more fuzzy.
What I mean by fuzzy is that in a texture view you can see the pixels, especially when zooming. That is not the case when using a surfaceview. Why is that the case?
UPD:
Sorry,but after I re-write my shit code, the key is the preview size too small that caused "fuzziness", so you should set a reasonable preview Size,not the reason strikeout below, but auto-focus is suggested ...
Size size = getBestSupportSize(parameters.getSupportedPreviewSizes(), width, height);
parameters.setPreviewSize(size.width, size.height);
As to the method getBestSupportSize(), how to get the bestSize for your project needs, in this case, it is as large as the screen width andhe ratio is 4/3 your's may be some other, I calculate the ration dividing width/height.
private Size getBestSupportSize(List<Size> sizes, int width, int height) {
Size bestsize = sizes.get(0);
int screenWidth = getResources().getDisplayMetrics().widthPixels;
int dt = Integer.MAX_VALUE;
for (int i = sizes.size() - 1; i >= 0; i--) {
Log.d(TAG, "-index : " + i);
Size s = sizes.get(i);
if (s.width * 3.0f / 4 == s.height) {
int newDT = Math.abs(screenWidth - s.width);
if (newDT < dt && screenWidth < s.width) {
dt = newDT;
bestsize = s;
}
}
}
return bestsize;//note that if no "4/3" size supported,default return size[0]
}
So this "fuzziness" was caused by a small previewSize calcualate a best size for the camera using this getSupportedPreviewSizes() method
And I will keep the autoFocus snippet below, strikeout though, FYR if is needed.
Well i got the solution for this "fuzzy" problem,and my case is just using TextureView andsurfaceTexture to take a pic instead of old surfaceView withsurfaceHolderway.
The key is set this mCamera.autofocus(), why the pic is"fuzzy" is bacause we lack of this autoFocus setting.
like below :
mCamera.setPreviewTexture(surface);
//enable autoFocus if moving
mCamera.setAutoFocusMoveCallback(new AutoFocusMoveCallback() {
#Override
public void onAutoFocusMoving(boolean start, Camera camera) {
if (start) { //true means you are moving the camera
mCamera.autoFocus(myAutoFocus);
}
}
});
mCamera.startPreview();
The autoFocusCallback like this:
AutoFocusCallback myAutoFocus = new AutoFocusCallback() {
#Override
public void onAutoFocus(boolean success, Camera camera) {
}
};

Record video with a size of 480 * 480 px in android?

I have built a module similar to vine app video recording. But I am not able to make the video size to 480x480 px . Is there any way to do that. Thanks
The Android camera has a limited list of available sizes for the camera. So we need to select best camera size and select sub image(480x480) from the original camera image.
For example on my HTC one m8 I have this sizes for the camera:
1920x1088
1920x1080
1808x1080
....
720x480
640x360
640x480
576x432
480x320
384x288
352x288
320x240
240x160
176x144
You can retrieve list of available size by use getSupportedPreviewSizes() method.
public Camera mCamera;//Your camera instance
public List<Camera.Size> cameraSizes;
private final int CAMERA_IMAGE_WIDTH = 480;
private final int CAMERA_IMAGE_HEIGHT = 480;
...
cameraSizes = mCamera.getParameters().getSupportedPreviewSizes()
After that, you need to find most suitable camera size and set preview size for the camera.
Camera.Size findBestCameraSize(int width, int height){
Camera.Size bestSize = cameraSizes.get(0);
int minimalArea = bestSize.height * bestSize.width;
for(int i = 1;i < cameraSizes.size();i++){
Camera.Size size = cameraSizes.get(i);
int area = size.height * size.width;
if(size.width < width || size.height < height){
continue;
}
if(area < minimalArea){
bestSize = size;
minimalArea = area;
}
}
return bestSize;
}
...
SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {
public void surfaceCreated(SurfaceHolder holder) {
//Do something
}
public void surfaceChanged(SurfaceHolder holder,
int format, int width,
int height) {
Camera.Parameters params = mCamera.getParameters();
Camera.Size size = findBestCameraSize(CAMERA_IMAGE_WIDTH, CAMERA_IMAGE_HEIGHT);
params.setPreviewSize(size.width, size.height);
camera.setParameters(params);
if(mCamera != null){
mCamera.startPreview();
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// Do something
}
};
After setup camera size, we need to get sub image from result bitmap, from the camera. You need put this code where you receive a bitmap picture(Usually I use an OpenCV library and matrixes for better performance).
Bitmap imageFromCamera = //here ve receive image from camera.
Camera.Size size = mCamera.getParameters().getPreviewSize();
int x = (size.width - CAMERA_IMAGE_WIDTH)/2;
int y = (size.height - CAMERA_IMAGE_HEIGHT)/2;
Bitmap resultBitmap = null;
if(x < 0 || y < 0){
resultBitmap = imageFromCamera;
}else{
resultBitmap = Bitmap.createBitmap(imageFromCamera, x, y, CAMERA_IMAGE_WIDTH, CAMERA_IMAGE_HEIGHT);
}
The video capture resolution for android are limited to the native resolutions supported by the camera.
You can try using a 3rd party library for video post processing. So you can crop or re-scale the video captured by the camera.
I am using this one
android-gpuimage-videorecording
and it works quite well.

Samsung Galaxy S4 , Image gets corrupted while taking from camera

I'm using camera on my app. Camera is working perfect on all devices upto Samsung S3 even. Image is correct from all other devices.
While taking image from S4 , image gets corrupted and image gets saved with some lines in horizontal.
I tried changing resolution and everything but still issue is there .
Any help
I've been pulling my hair out over this and I think I found the issue, at least with regards to my app - it's got something to do with the aspect ratio of the preview image versus the captured image.
In my case, my code was sniffing out the ideal preview size based on the aspect ratio of the screen. The S4 is a 1080p phone, so the preview image was 1920x1080, which is a 16:9 aspect ratio. But my code was hardcoded to capturing a 1600x1200 image, which is 4:3, because that's all I needed. But 1600x1200 is not one of the valid sizes the S4 supports.
Without setting the size, the S4 captured 4128x3096, which is the maximum size, and is 4:3, but the lines still appeared. Once I told the camera to capture a 16:9 photo, the lines went away. In your case, you might want to adjust the preview's aspect ratio.
Here's some code which can tell you the available sizes.
List<Camera.Size> previewSizes = p.getSupportedPreviewSizes();
int i = 1;
for (Size previewSize : previewSizes) {
Log.v("DebugCamera", "previewSize " + i++ + " width: " + previewSize.width + " height: " + previewSize.height);
}
Just tried this code on S4 and it works. Try it:
private Camera.Size getBestPreviewSize(int width, int height)
{
Camera.Size result=null;
Camera.Parameters p = camera.getParameters();
for (Camera.Size size : p.getSupportedPreviewSizes()) {
if (size.width<=width && size.height<=height) {
if (result==null) {
result=size;
} else {
int resultArea=result.width*result.height;
int newArea=size.width*size.height;
if (newArea>resultArea) {
result=size;
}
}
}
}
return result;
}
public void surfaceCreated(SurfaceHolder holder) {
if(myCamera == null){
myCamera = getCameraInstance();
try {
myCamera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// empty. Take care of releasing the Camera preview in your activity.
// Surface will be destroyed when we return, so stop the preview.
if (myCamera != null)
{
myCamera.stopPreview();
myCamera.setPreviewCallback(null);
myCamera.release();
}
}
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
//This line helped me set the preview Display Orientation to Portrait
//Only works API Level 8 and higher unfortunately.
camera.setDisplayOrientation(90);
Camera.Parameters parameters = camera.getParameters();
Camera.Size size = getBestPreviewSize(width, height);
parameters.setPreviewSize(size.width, size.height);
camera.setParameters(parameters);
camera.startPreview();
}

Camera orientation not changing Android 2.3

For my application I am using android native camera and previewing the image using surface view. in my case everything is working except the camera orientation. When I open the camera by setting screenOrientation="landscape on manifest file I am getting the preview without any problem in landscape mode. But I need to take image in portrait mode, for this I changed my manifest like android:screenOrientation="portrait" and change my code like mCamera.setDisplayOrientation(90), params.set("orientation", "landscape"),params.set("rotation", 90), but still I am getting 90 degree rotated image.
And my code is
public void setupCamera(int width, int height) {
Log.i(TAG, "setupCamera");
synchronized (this) {
if (mCamera != null) {
Camera.Parameters params = mCamera.getParameters();
List<Camera.Size> sizes = params.getSupportedPreviewSizes();
List<Camera.Size> imgsize=params.getSupportedPictureSizes();
mFrameWidth = width;
mFrameHeight = height;
// mCamera.setDisplayOrientation(90);
params.set("orientation", "landscape");
params.set("rotation", 90);
// selecting optimal camera preview size
{
int minDiff = Integer.MAX_VALUE;
for (Camera.Size size : sizes) {
if (Math.abs(size.height - height) < minDiff) {
mFrameWidth = size.width;
mFrameHeight = size.height;
minDiff = Math.abs(size.height - height);
}
}
}
params.setPreviewSize(getFrameWidth(), getFrameHeight());
List<String> FocusModes = params.getSupportedFocusModes();
if (FocusModes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO))
{
params.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
}
mCamera.setParameters(params);
mCamera.startPreview();
}
}
}
I am using Micromax A 52 model...
Any one please help.....
If your application runs on v2.2 or above you can rotate camera orientation to portrait using camera.setDisplayOrientation(90).
For others:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO)
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
//After opening camera - call via reflection
Method rotateMethod = android.hardware.Camera.class.getMethod("setDisplayOrientation", int.class);
rotateMethod.invoke(mCamera, 90);
for more details please refer this link and this Hope this will be helpful

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