Develop Reference

TextureView TranslationX & Y not expected behaviour on API 23

Currently I am making a camera player with a textureview to render my camera. Because the preview can have any dimension I have created some custom code to alter the textureview when OnSurfaceTextureUpdated is called:
void updateTextureMatrix(int width, int height) {
Display display = WindowManager.DefaultDisplay;
var isPortrait = (display.Rotation == SurfaceOrientation.Rotation0 || display.Rotation == SurfaceOrientation.Rotation180);
int previewWidth = orgPreviewWidth;
int previewHeight = orgPreviewHeight;
if(isPortrait) {
previewWidth = orgPreviewHeight;
previewHeight = orgPreviewWidth;
}
// determine which part to crop
float widthRatio = (float)width / previewWidth;
float heightRatio = (float)height / previewHeight;
float scaleX;
float scaleY;
if(widthRatio > heightRatio) {
// height must be cropped
scaleX = 1;
scaleY = widthRatio * ((float)previewHeight / height);
} else {
// width must be cropped
scaleX = heightRatio * ((float)previewWidth / width);
scaleY = 1;
}
Android.Graphics.Matrix matrix = new Android.Graphics.Matrix();
matrix.SetScale(scaleX, scaleY);
_textureView.SetTransform(matrix);
float scaledWidth = width * scaleX;
float scaledHeight = height * scaleY;
float dx = (width - scaledWidth) * 0.5f;
float dy = (height - scaledHeight) * 0.5f;
_textureView.TranslationX = dx;
_textureView.TranslationY = dy;
}
The scaling & calculation of dx & dy work perfectly fine on older android devices but the devices I have at my disposal with API level 23 throw unexpected behaviour.
The galaxy S3 displays it correctly:
But on the S7:
The phone cuts off a lot of the image, despite positioning it correctly. This makes me believe the bottom part is not being rendered where on older devices it is. Can anyone confirm this and point me in the correct position to fix this issue?

After long testing I figured out the issue was due to the SetTransform method. I was setting my scale using the matrix but this somehow rendered my texture & ignored the TranslationX & TranslationY. Removing the matrix & replacing it by
float scaledWidth = width * scaleX;
float scaledHeight = height * scaleY;
float dx = (width - scaledWidth) * 0.5f;
float dy = (height - scaledHeight) * 0.5f;
_textureView.ScaleX = scaleX;
_textureView.ScaleY = scaleY;
_textureView.TranslationX = dx;
_textureView.TranslationY = dy;
Fixed my issue of rendering wrongly on certain android devices.

Matrix scale video on TextureView Android

I'm trying to play video with ExoPlaye on TextureView. In order to scale and crop video to fit view I use matrix. My custom view extends `TextureView' Here is my code:
#Override
public void onVideoSizeChanged(int width, int height, float pixelWidthHeightRatio) {
updateTextureViewSize(width, height);
Log.v("EXO", "onVideoSizeChanged() " + width + "x" + height);
}
private void updateTextureViewSize(float videoWidth, float videoHeight) {
float viewWidth = getWidth();
float viewHeight = getHeight();
float scaleX = 1.0f;
float scaleY = 1.0f;
float viewRatio = viewWidth / viewHeight;
float videoRatio = videoWidth / videoHeight;
if (viewRatio > videoRatio) {
// video is higher than view
scaleY = videoHeight / videoWidth;
} else {
//video is wider than view
scaleX = videoWidth / videoHeight;
}
Matrix matrix = new Matrix();
matrix.setScale(scaleX, scaleY, viewWidth / 2, viewHeight / 2);
setTransform(matrix);
}
I had a rectangular views and it worked perfectly. But now views have 2 states: expanded (the old ones that are still rectangular) and collapsed (have smaller height.
So now video is stretched vertically in those collapsed views.
For instance I have view 1080x480 and video 360x640 but it looks like video is scaled and cropped to 1080x1080 and than stretched to 1080x480.
What am I doing wrong here ?
UPD: Here are screenshots:

I fixed this issue next by multiplying or dividing scale factors by viewRatio (width / height):
if (viewRatio > videoRatio) {
// video is higher than view
scaleY = videoHeight / videoWidth * viewRatio;
} else {
//video is wider than view
scaleX = videoWidth / videoHeight / viewRatio;
}
But I did not get why it works like this. According to my calculations if I have, for instance, view 1080x480 and video 360x640 video should be scaled to have width x' = 1080 and height proportional. So height should be y' = 640*1080/360 (videoHeight * viewHeight / videoWidth) and x' = 1080
According to this image:
sx * 360 = 1080 => sx = 1080 / 360
sy * 640 = 640*1080/360 => sy = 1080 / 360
Looks like it makes sense. If we need save proportions width and height should be multiplied by the same factor. But it does not work this way. Where is a mistake ? Is there any good doc on this ?

check updateTextureViewSize :
/**
* Set the display options
*
* #param layout <ul>
* <li>{#link #VIDEO_LAYOUT_ORIGIN}
* <li>{#link #VIDEO_LAYOUT_SCALE}
* <li>{#link #VIDEO_LAYOUT_STRETCH}
* <li>{#link #VIDEO_LAYOUT_ZOOM}
* </ul>
*/
public void updateTextureViewSize(int layout,float videoWidth, float videoHeight) {
RelativeLayout.LayoutParams lp = (android.widget.RelativeLayout.LayoutParams) getLayoutParams();
DisplayMetrics disp = m_Context.getResources().getDisplayMetrics();
int windowWidth = disp.widthPixels, windowHeight = disp.heightPixels;
float windowRatio = windowWidth / (float) windowHeight;
float videoRatio = (float) videoWidth / (float) videoHeight;
m_iSurfaceHeight = videoHeight;
m_iSurfaceWidth = videoWidth;
if (VIDEO_LAYOUT_ORIGIN == layout && m_iSurfaceWidth < windowWidth && m_iSurfaceHeight < windowHeight) {
lp.width = (int) (m_iSurfaceHeight * videoRatio);
lp.height = m_iSurfaceHeight;
} else if (layout == VIDEO_LAYOUT_ZOOM) {
lp.width = windowRatio > videoRatio ? windowWidth : (int) (videoRatio * windowHeight);
lp.height = windowRatio < videoRatio ? windowHeight : (int) (windowWidth / videoRatio);
} else {
boolean full = layout == VIDEO_LAYOUT_STRETCH;
lp.width = (full || windowRatio < videoRatio) ? windowWidth : (int) (videoRatio * windowHeight);
lp.height = (full || windowRatio > videoRatio) ? windowHeight : (int) (windowWidth / videoRatio);
lp.leftMargin = (disp.widthPixels - lp.width) / 2;
lp.topMargin = (disp.heightPixels - lp.height) / 2;
}
lp.leftMargin = (disp.widthPixels - lp.width) / 2;
lp.topMargin = (disp.heightPixels - lp.height) / 2;
getHolder().setFixedSize(m_iSurfaceWidth, m_iSurfaceHeight);
setLayoutParams(lp);
m_iVideoLayout = layout;
}

How can I make quarter indicators in Android Wear Watch Face?

It's no secret. My math skills aren't that impressive.
I'm developing my own Wear Watchface. But I want to draw a Drawline to the center of the screen for every 10 minute place on the watch. (See the 500px analog example).
By using the Google example code I can achieve this but only an entire line from the side of the screen to the center. But I want it to be like 5% (or a fixed amount of pixels) in length of that like in the 500px watchface. This is Google's code for drawing the second dial:
float centerX = width / 2f;
float centerY = height / 2f;
float secRot = mTime.second / 30f * (float) Math.PI;
float secLength = centerX - 20;
float secX = (float) Math.sin(secRot) * secLength;
float secY = (float) -Math.cos(secRot) * secLength;
canvas.drawLine(centerX, centerY, centerX + secX, centerY + secY, mHandPaint);
By changing the mTime.second I can draw from a specific second.

Found the solution, here's a snippet:
int teller_minuut_stip = 0; //Current minute
float secRot_stip = teller_minuut_stip / 30f * (float) Math.PI;
float secRot_stip_klein = teller_minuut_stip / 30f * (float) Math.PI;
float secLength_stip = centerX - 10;
float secX = (float) Math.sin(secRot_stip) * secLength_stip;
float secY = (float) -Math.cos(secRot_stip) * secLength_stip;
float secLength_stip_klein = centerX - 140;
float secX_klein = (float) Math.sin(secRot_stip_klein) * secLength_stip_klein;
float secY_klein = (float) -Math.cos(secRot_stip_klein) * secLength_stip_klein;
float eindpunt_x = centerX + secX;
float eindpunt_y = centerY + secY;
float lijn_x = eindpunt_x - secX_klein;
float lijn_y = eindpunt_y - secY_klein;
canvas.drawLine(eindpunt_x, eindpunt_y, lijn_x, lijn_y, datePaint_cirkel_kleurtien);

android 3d vertical carousel view

I am using http://www.codeproject.com/Articles/146145/Android-3D-Carousel code to create a vertical carousel view.i can see the vertical carousel using below changes in the code but center item is not properly placed in the screen and if the list items size increased, diameter moves upwards.
private void setUpChild(CarouselImageView child, int index, float angleOffset) {
// Ignore any layout parameters for child, use wrap content
addViewInLayout(child, -1 /*index*/, generateDefaultLayoutParams());
child.setSelected(index == mSelectedPosition);
int h;
int w;
if (mInLayout)
{
h = (getMeasuredHeight() - getPaddingBottom()-getPaddingTop())/3;
w = getMeasuredWidth() - getPaddingLeft() - getPaddingRight()/3;
}
else
{
h = (getMeasuredHeight() - getPaddingBottom()-getPaddingTop())/3;
w = getMeasuredWidth() - getPaddingLeft() - getPaddingRight()/3;
}
child.setCurrentAngle(angleOffset);
// modify the diameter.
Calculate3DPosition(child, w*(getAdapter().getCount()/4), angleOffset);
// Measure child
child.measure(w, h);
int childLeft;
// Position vertically based on gravity setting
int childTop = calculateTop(child, true);
childLeft = 0;
child.layout(childLeft, childTop, w, h);
}
change in calculate3position function as below
float x = (float) (-diameter/2 * Math.cos(angleOffset) * 0.00001);
float z = diameter/2 * (1.0f - (float)Math.cos(angleOffset));
float y = (float) (diameter/2 * Math.sin(angleOffset)) + diameter/2 - child.getWidth();
child.setX(x);
child.setZ(z);
child.setY(y);

I think that this calculation:
float x = (float) (-diameter/2 * Math.cos(angleOffset) * 0.00001);
float z = diameter/2 * (1.0f - (float)Math.cos(angleOffset));
float y = (float) (diameter/2 * Math.sin(angleOffset)) + diameter/2 - child.getWidth();
should be this:
float x = 0.0f
float z = diameter/2.0f * (1.0f - (float)Math.cos(angleOffset));
float y = (diameter/2.0f * Math.sin(angleOffset)) + diameter/2.0f - child.getHeight()/2.0f;
Your x position should always be zero, and your y position should be based on the sin, and should be offset by 1/2 of the height of the child instead of 1/2 of the width.

Hello try this code and replace with this code in your Calculate3DPosition method
angleOffset = angleOffset * (float) (Math.PI / 180.0f);
float y = (float) (((diameter * 60) / 100) * Math.sin(angleOffset)) + ((diameter * 50) / 100);
float z = diameter / 2 * (1.0f - (float) Math.cos(angleOffset));
float x = (float) (((diameter * 5) / 100) * Math.cos(angleOffset) * 0.3);
child.setItemX(x);
child.setItemZ((z * 30) / 100);
child.setItemY(-(y));
its solve my problem please try this one

Get the displayed size of an image inside an ImageView

The code is simple:
<ImageView android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src="#drawable/cat"/>
Notice the ImageView used fill_parent for width and height.
The image cat is a small image and it will be zoomed in to fit the ImageView, and keep the width/height ratio at the same time.
My question is how to get the displayed size of the image? I tried:
imageView.getDrawable().getIntrinsicHeight()
But which it the original height of the image cat.
I tried:
imageView.getDrawable().getBounds()
But which returns Rect(0,0,0,0).

the following will work:
ih=imageView.getMeasuredHeight();//height of imageView
iw=imageView.getMeasuredWidth();//width of imageView
iH=imageView.getDrawable().getIntrinsicHeight();//original height of underlying image
iW=imageView.getDrawable().getIntrinsicWidth();//original width of underlying image
if (ih/iH<=iw/iW) iw=iW*ih/iH;//rescaled width of image within ImageView
else ih= iH*iw/iW;//rescaled height of image within ImageView
(iw x ih) now represents the actual rescaled (width x height) for the image within the view (in other words the displayed size of the image)
EDIT: I think a nicer way to write the above answer (and one that works with ints) :
final int actualHeight, actualWidth;
final int imageViewHeight = imageView.getHeight(), imageViewWidth = imageView.getWidth();
final int bitmapHeight = ..., bitmapWidth = ...;
if (imageViewHeight * bitmapWidth <= imageViewWidth * bitmapHeight) {
actualWidth = bitmapWidth * imageViewHeight / bitmapHeight;
actualHeight = imageViewHeight;
} else {
actualHeight = bitmapHeight * imageViewWidth / bitmapWidth;
actualWidth = imageViewWidth;
}
return new Point(actualWidth,actualHeight);

Here is a helper function to get the bounds of image in an imageView.
/**
* Helper method to get the bounds of image inside the imageView.
*
* #param imageView the imageView.
* #return bounding rectangle of the image.
*/
public static RectF getImageBounds(ImageView imageView) {
RectF bounds = new RectF();
Drawable drawable = imageView.getDrawable();
if (drawable != null) {
imageView.getImageMatrix().mapRect(bounds, new RectF(drawable.getBounds()));
}
return bounds;
}

I guess a lot of people are coming from this example https://developer.android.com/training/animation/zoom.html and don't want to use android:scaleType="centerCrop" (maybe because the ImageView is in a constraint layout and you want to see the small picture uncroped) don't you worry, I got your back!
Just replace the entire block beginning with
// Adjust the start bounds to be the same aspect ratio as the final
// bounds using the "center crop" technique.
with the following
//adjust for scaled image to constraint
int realheight = ResourcesCompat.getDrawable(getResources(),imageResId,null).getIntrinsicHeight();
int realwidth = ResourcesCompat.getDrawable(getResources(),imageResId,null).getIntrinsicWidth();
// Adjust the start bounds to be the same aspect ratio as the final
// bounds using ueen's adjusteddimensions technique. This prevents undesirable
// stretching during the animation. Also calculate the start scaling
// factor (the end scaling factor is always 1.0).
float startScale;
if ((float) finalBounds.width() / finalBounds.height()
> (float) startBounds.width() / startBounds.height()) {
// Extend start bounds horizontally
// after check whether height or width needs adjusting
if ((float) startBounds.width() / startBounds.height() < (float) realwidth / realheight) {
int adjustedheight = realheight*startBounds.width()/realwidth;
int adjustedoffset = (startBounds.height()-adjustedheight) / 2;
startScale = (float) adjustedheight / finalBounds.height();
float startWidth = startScale * finalBounds.width();
float deltaWidth = (startWidth - startBounds.width()) / 2;
startBounds.left -= deltaWidth;
startBounds.right += deltaWidth;
startBounds.offset(+0, +adjustedoffset);
} else {
int adjustedwidth = realwidth*startBounds.height()/realheight;
int adjustedoffset = (startBounds.width()-adjustedwidth) / 2;
startScale = (float) startBounds.height() / finalBounds.height();
float startWidth = startScale * finalBounds.width();
float deltaWidth = (startWidth - adjustedwidth) / 2;
startBounds.left -= deltaWidth;
startBounds.right += deltaWidth;
startBounds.offset(+adjustedoffset, +0);
}
} else {
// Extend start bounds vertically
// after check whether height or width needs adjusting
if ((float) startBounds.width() / startBounds.height() > (float) realwidth / realheight) {
int adjustedwidth = realwidth*startBounds.height()/realheight;
int adjustedoffset = (startBounds.width()-adjustedwidth) / 2;
startScale = (float) adjustedwidth / finalBounds.width();
float startHeight = startScale * finalBounds.height();
float deltaHeight = (startHeight - startBounds.height()) / 2;
startBounds.top -= deltaHeight;
startBounds.bottom += deltaHeight;
startBounds.offset(+adjustedoffset, +0);
} else {
int adjustedheight = realheight*startBounds.width()/realwidth;
int adjustedoffset = (startBounds.height()-adjustedheight) / 2;
startScale = (float) startBounds.width() / finalBounds.width();
float startHeight = startScale * finalBounds.height();
float deltaHeight = (startHeight - adjustedheight) / 2;
startBounds.top -= deltaHeight;
startBounds.bottom += deltaHeight;
startBounds.offset(+0, +adjustedoffset);
}
}
works like a charme,
you're welcome :)
Further explanation: as usual we check wheter the picture is taller than wide (expanded the height of the picture should match the height of expandedImageView) or vice versa. Then we check if the picture in the original (smaller) ImageView (thumbView) is matching the width or the heigth, so we can adjust for the space.
This way we achieve a smooth scaling animation while not croping the picture in the thumbView, no matter it's dimension (as they may change from device to device when using constarints) or that of the picture.

use
// For getting imageview height
imgObj.getMeasuredHeight()
// For getting imageview width
imgObj.getMeasuredWidth();
//For getting image height inside ImageView
imgObj.getDrawable().getIntrinsicHeight();
//For getting image width inside ImageView
imgObj.getDrawable().getIntrinsicWidth();