Develop Reference

camera2 capture image different with preview

my capture picture output not same with my camera preview in landscape mode
before cpture
after capture
whats wrong ? and whats have i do. thanks

This is the AutoFitTextView class which I pulled from Google sample. You can take a look at here. It aims to show camera view and config the ratio base on the physical size of device.
public class AutoFitTextureView extends TextureView {
private int mRatioWidth = 0;
private int mRatioHeight = 0;
// Some codes here...
public void setAspectRatio(int width, int height) {
if (width < 0 || height < 0) {
throw new IllegalArgumentException("Size cannot be negative.");
}
mRatioWidth = width;
mRatioHeight = height;
requestLayout();
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
if (0 == mRatioWidth || 0 == mRatioHeight) {
setMeasuredDimension(width, height);
} else {
if (width < height * mRatioWidth / mRatioHeight) {
setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
} else {
setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
}
}
}
}
There are 2 points in this class:
You can't ensure the ratio works properly in every device. However, we are able to choose optimized size which is already defined in this class.
This condition is wrong: if (width < height * mRatioWidth / mRatioHeight). It should be > because when width is bigger than height, we calculate and set measure dimension base on width (not height).
UPDATED
If you just want every device will work properly in a particular ratio, then set hard ratio for it (for instance: 4/3)
You can achieve that by replacing those lines of code:
mPreviewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class),
rotatedPreviewWidth, rotatedPreviewHeight, maxPreviewWidth,
maxPreviewHeight, largest);
-> previewSize = Size(4, 3)

Android Camera 2 preview size and devices aspect ratio

I'm implementing Camera 2 API in my project. I'm using TextureView and these line of codes to set the camera fullscreen preview size:
StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
mPreviewSize = map.getOutputSizes(SurfaceTexture.class)[0];
This seems to be the largest preview size that device support. I'm not sure if this size works with all devices and fit its device's aspect ratio without being stretched. Does anyone know?

If your Camera resolutions , texture view and your device's display dimensions are not same then you have to adjust the dimensions. For that you have to put your TextureView inside of FrameLayout. Below Code is applicable to all the devices with various Display resolutions.
Take your Display Dimetions if you are previewing in full screen.Take int DSI_height, int DSI_width global variable.
DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
DSI_height = displayMetrics.heightPixels;
DSI_width = displayMetrics.widthPixels;
select your required resolutions from Camera2 API and assign to Size imageDimension, Take private Size imageDimension globally and use
setAspectRatioTextureView(imageDimension.getHeight(),imageDimension.getWidth());
and use below logic
private void setAspectRatioTextureView(int ResolutionWidth , int ResolutionHeight )
{
if(ResolutionWidth > ResolutionHeight){
int newWidth = DSI_width;
int newHeight = ((DSI_width * ResolutionWidth)/ResolutionHeight);
updateTextureViewSize(newWidth,newHeight);
}else {
int newWidth = DSI_width;
int newHeight = ((DSI_width * ResolutionHeight)/ResolutionWidth);
updateTextureViewSize(newWidth,newHeight);
}
}
private void updateTextureViewSize(int viewWidth, int viewHeight) {
Log.d(TAG, "TextureView Width : " + viewWidth + " TextureView Height : " + viewHeight);
textureView.setLayoutParams(new FrameLayout.LayoutParams(viewWidth, viewHeight));
}

There might be edge cases where that approach would fail, but I don't have a perfect answer to your question why.
In contrast, I have a proper approach on how to implement a version that will most certainly work:
Looking at the Google API demos for the Camera 2, I found some sample code that should be helpful to you to make sure it will fit all screen sized correctly:
/**
* Given {#code choices} of {#code Size}s supported by a camera, choose the smallest one that
* is at least as large as the respective texture view size, and that is at most as large as the
* respective max size, and whose aspect ratio matches with the specified value. If such size
* doesn't exist, choose the largest one that is at most as large as the respective max size,
* and whose aspect ratio matches with the specified value.
*
* #param choices The list of sizes that the camera supports for the intended output
* class
* #param textureViewWidth The width of the texture view relative to sensor coordinate
* #param textureViewHeight The height of the texture view relative to sensor coordinate
* #param maxWidth The maximum width that can be chosen
* #param maxHeight The maximum height that can be chosen
* #param aspectRatio The aspect ratio
* #return The optimal {#code Size}, or an arbitrary one if none were big enough
*/
private static Size chooseOptimalSize(Size[] choices, int textureViewWidth,
int textureViewHeight, int maxWidth, int maxHeight, Size aspectRatio) {
// Collect the supported resolutions that are at least as big as the preview Surface
List<Size> bigEnough = new ArrayList<>();
// Collect the supported resolutions that are smaller than the preview Surface
List<Size> notBigEnough = new ArrayList<>();
int w = aspectRatio.getWidth();
int h = aspectRatio.getHeight();
for (Size option : choices) {
if (option.getWidth() <= maxWidth && option.getHeight() <= maxHeight &&
option.getHeight() == option.getWidth() * h / w) {
if (option.getWidth() >= textureViewWidth &&
option.getHeight() >= textureViewHeight) {
bigEnough.add(option);
} else {
notBigEnough.add(option);
}
}
}
// Pick the smallest of those big enough. If there is no one big enough, pick the
// largest of those not big enough.
if (bigEnough.size() > 0) {
return Collections.min(bigEnough, new CompareSizesByArea());
} else if (notBigEnough.size() > 0) {
return Collections.max(notBigEnough, new CompareSizesByArea());
} else {
Log.e(TAG, "Couldn't find any suitable preview size");
return choices[0];
}
}
Source
Also you should take a look at the whole Camera2BasicFragment.java and AutoFitTextureView.java classes for proper implementation.

I solved this problem via a different approach. I get the screen width and height and calculate how much wider or higher the preview would have to be to fill the whole screen and keep aspect ratio. It works pretty well for me without any distortions.
Add a class member variable:
public DisplayMetrics mMetrics = new DisplayMetrics();
Use the following as onMeasure:
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
if (0 == mRatioWidth || 0 == mRatioHeight) {
setMeasuredDimension(width, height);
} else {
WindowManager windowManager = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
windowManager.getDefaultDisplay().getMetrics(mMetrics);
double ratio = (double)mRatioWidth / (double)mRatioHeight;
double invertedRatio = (double)mRatioHeight / (double)mRatioWidth;
double portraitHeight = width * invertedRatio;
double portraitWidth = width * (mMetrics.heightPixels / portraitHeight);
double landscapeWidth = height * ratio;
double landscapeHeight = (mMetrics.widthPixels / landscapeWidth) * height;
if (width < height * mRatioWidth / mRatioHeight) {
setMeasuredDimension((int)portraitWidth, mMetrics.heightPixels);
} else {
setMeasuredDimension(mMetrics.widthPixels, (int)landscapeHeight);
}
}
}
Any feedback is greatly appreciated ;)
Best M

Change the AutoFitTextureView.java file and set value like below:
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
if (0 == mRatioWidth || 0 == mRatioHeight) {
setMeasuredDimension(width, height);
} else {
if (width < height * mRatioWidth / mRatioHeight) {
setMeasuredDimension(width, height);
Log.d("rlijeolid1",String.valueOf(width)+"\t"+String.valueOf(height));
} else {
setMeasuredDimension(width , height);
Log.d("rlijeolid2",String.valueOf(height * mRatioWidth / mRatioHeight)+"\t"+String.valueOf(height));
}
}
}

ListView with images with different height coming from network causes "flickers"

Here's the scenario: I've some info to show on a ListView. Every row can have, title, body, date, avatar, and more data. And a ImageView that comes from network. The ImageView has a different height on every row. I know what will be it's height in px once downloaded.
What I'm doing right now is to adjust the width of the image to fill it's parent, and auto adjusting the it's height automatically.
I'm loading a fixed placeholder while the image is downloaded.
Here's the code of the ImageView:
public class ResizableImageView2 extends ImageView {
public ResizableImageView2(Context context, AttributeSet attrs) {
super(context, attrs);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
Drawable d = getDrawable();
if(d!=null){
// ceil not round - avoid thin vertical gaps along the left/right edges
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = (int) Math.ceil((float) width * (float) d.getIntrinsicHeight() / (float) d.getIntrinsicWidth());
setMeasuredDimension(width, height);
}else{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
}
The problem is: The placeholder is loaded with a fixed size, and once downloaded we put the ImageView, the layout recalculates it self, and that causes wasted cpu, slow scrolling.
I'm already pre-caching the incoming rows to "minimize" this problem. This way the app loads an image from disk/memory 80% of the time (if you are in a good network and you scroll in a normal speed) and the listview does not "flicker".
The solution I'm searching is to preset the size of the placeholder at the same size that will be the downloaded image. But for some reason I'm having a hard time doing this.
I can make a little cropping of the image (some small pixels) if needed, but nothing as make all the images croped at the same size :P
Ideas? examples?

Finally for me the solution was:
public class ResizableImageView2 extends ImageView {
private int fixedHeight = -1;
private int fixedWidth = -1;
public ResizableImageView2(Context context, AttributeSet attrs) {
super(context, attrs);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (BuildConfig.DEBUG) Log.e("ResizableImageView2", "onMeasure called!");
if (fixedHeight != -1 && fixedWidth != -1) {
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = (int) Math.ceil((float) width * (float) fixedHeight / (float) fixedWidth);
setMeasuredDimension(width, height);
} else {
Drawable d = getDrawable();
if (d != null) {
// ceil not round - avoid thin vertical gaps along the left/right edges
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = (int) Math.ceil((float) width * (float) d.getIntrinsicHeight() / (float) d.getIntrinsicWidth());
setMeasuredDimension(width, height);
} else {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
}
public void setFixedHeight(int fixedHeight) {
this.fixedHeight = fixedHeight;
}
public void setFixedWidth(int fixedWidth) {
this.fixedWidth = fixedWidth;
}
I can set the height and the width before downloading the bitmap with setFixedHeight and setFixedWidth. The place holder should be a 9 patch for better stretching. and at the layout I've android:scaleType="fitXY".
With this I can pre-set the size of the imageview before downloading it, and once downloaded the image view will fill the width and have a height with the correct aspect ratio.

How to change position of point as per screen resolution?

Suppose I put some points as (x1,y1) = (133,123), (x2,y2) = (149,136), (x3,y3) = (182,136) and so on which makes a shape something like this:
Now I want to change the position of these points as per the screen resolution such that the shape gets resized and gets centered and also such that the shape doesn't get damaged. Please help me.

You can grab the scale factor from the DisplayMetrics as shown in the Android - Supporting Multiple Screens documentation:
final float scale = getResources().getDisplayMetrics().density;
Multiply all you x and y coordinates with scale and your points are screen density independent.
To fit the image on the screen (or View probably), you can grab the width and height of your View. Check the width and height of your image and calculate the maximum scale factor.
Combine (multiply) both scale factors and your image should fit your View.

you can use onMeasure method to get measure then you can start painting with that position. I dont know below code is working truly, maybe it need to be optimized.
protected void onDraw(Canvas canvas) {
int height = getMeasuredHeight();
int width = getMeasuredWidth();
// Find the center
px = width / 2;
py = height / 2;
canvas.drawColor(BACKGROUND);
canvas.drawBitmap(mBitmap, 0, 0, null);
canvas.drawPath(mPath, mPaint);
// TODO remove if you dont want points to be drawn
for (Point point : mPoints) {
canvas.drawPoint(point.x + px, point.y + py, mPaint);
}
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int measuredHeight = measureHeight(heightMeasureSpec);
int measuredWidth = measureWidth(widthMeasureSpec);
setMeasuredDimension(measuredHeight, measuredWidth);
}
private int measureHeight(int measureSpec) {
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
// Default size if no limits are specified.
int result = 500;
if (specMode == MeasureSpec.AT_MOST) {
// Calculate the ideal size of your
// control within this maximum size.
// If your control fills the available
// space return the outer bound.
result = specSize;
} else if (specMode == MeasureSpec.EXACTLY) {
// If your control can fit within these bounds return that value.
result = specSize;
}
return result;
}
private int measureWidth(int measureSpec) {
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
// Default size if no limits are specified.
int result = 500;
if (specMode == MeasureSpec.AT_MOST) {
// Calculate the ideal size of your control
// within this maximum size.
// If your control fills the available space
// return the outer bound.
result = specSize;
} else if (specMode == MeasureSpec.EXACTLY) {
// If your control can fit within these bounds return that value.
result = specSize;
}
return result;
}

ImageView adjustViewBounds not working

I have an ImageView with android:layout_width=100dp, android:layout_height=wrap_content and android:adjustViewBounds=true
It's source is a 50 x 50 px picture. But the aspect ratio is not preserved - height of the ImageView is 50px, not 100px (i.e. adjustViewBounds is not working). If I have a 200x200px picture it works - width and height are 100px. This code results in a 100px wide and 50px tall picture but the src image is square:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:id="#+id/photo"
android:src="#drawable/icon"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:adjustViewBounds="true" />
</LinearLayout>

The issue is that adjustViewBounds will not increase the size of the ImageView beyond the natural dimensions of the drawable. It will only shrink the view to maintain aspect ratio; if you provide a 500x500 image instead of a 50x50 image, this should work.
If you're interested in the spot where this behavior is implemented, see ImageView.java's onMeasure implementation.
One workaround is to implement a custom ImageView that changes this behavior in onMeasure.

There's a more simple way. Make your ImageView like this:
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitCenter"
android:adjustViewBounds="true"/>
This way drawable will stretch to fit in the ImageView center by preserving
the aspect ratio. We just have to calculate the right height to make it proportional
so we don't have any blank space:
private void setImageBitmap(Bitmap bitmap, ImageView imageView){
float i = ((float)imageWidth)/((float)bitmap.getWidth());
float imageHeight = i * (bitmap.getHeight());
imageView.setLayoutParams(new RelativeLayout.LayoutParams(imageWidth, (int) imageHeight));
imageView.setImageBitmap(bitmap);
}

In addition to #RomanNurik's answer
You can find working solution here, either copy-paste code or just add the Gradle dependency
dependencies {
compile 'com.inthecheesefactory.thecheeselibrary:adjustable-imageview:1.0.1'
}
P.S. Solution provided by #Nilzor didn't work for me

I had a similar requirement; in my case, I wanted the image to be square, and wanted the ImageView to match the aspect ratio so I could use its background and padding to draw a border.
I read the answers here but instead of overriding ImageView, I decided to make a Layout that guarantees its contents (should be only one view) are square. That way I could use a standard ImageView inside it. (And you never know, I might want to make something else square later. Although probably not.)
In case it's useful for anyone else, here's the code (feel free to copy). There are probably bugs as I just made it work for my app then stopped. :)
public class SquareLayout extends ViewGroup
{
public SquareLayout(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
}
public SquareLayout(Context context, AttributeSet attrs)
{
super(context, attrs);
}
public SquareLayout(Context context)
{
super(context);
}
#Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
// Work out width and height, and square size.
int width = r - l;
int height = b - t;
int size, xOffset, yOffset;
if(width < height)
{
size = width;
xOffset = 0;
yOffset = (height - size) / 2;
}
else
{
size = height;
xOffset = (width - size) / 2;
yOffset = 0;
}
for(int i = 0; i < getChildCount(); i++)
{
View child = getChildAt(i);
child.layout(xOffset, yOffset, size + xOffset, size + yOffset);
}
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
// Get width and height.
int w = -1, h = -1;
switch(MeasureSpec.getMode(widthMeasureSpec))
{
case MeasureSpec.AT_MOST:
case MeasureSpec.EXACTLY:
w = MeasureSpec.getSize(widthMeasureSpec);
break;
case MeasureSpec.UNSPECIFIED:
break;
}
switch(MeasureSpec.getMode(heightMeasureSpec))
{
case MeasureSpec.AT_MOST:
case MeasureSpec.EXACTLY:
h = MeasureSpec.getSize(heightMeasureSpec);
break;
case MeasureSpec.UNSPECIFIED:
break;
}
// If only one of width/height is unspecified, set them both the same.
if(w == -1 && h != -1)
{
w = h;
}
else if(h == -1 && w != -1)
{
h = w;
}
// Either they're both specified or both unspecified.
int childMeasureSpec;
if(w == -1)
{
childMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
}
else
{
childMeasureSpec = MeasureSpec.makeMeasureSpec(w, MeasureSpec.EXACTLY);
}
// Pass through to children.
int maxDimension = 1;
for(int i = 0; i < getChildCount(); i++)
{
View child = getChildAt(i);
child.measure(childMeasureSpec, childMeasureSpec);
maxDimension = Math.max(maxDimension, child.getMeasuredWidth());
maxDimension = Math.max(maxDimension, child.getMeasuredHeight());
}
if(w == -1)
{
w = maxDimension;
h = maxDimension;
}
setMeasuredDimension(w, h);
}
}

this line will do it for you android:scaleType="fitXY"