Develop Reference

ImageView Scaling: fix height variable width with maxWidth

I am going to show some images, but my constraint is as title. I want to make all images have same height but according to their width they must have different width. I just do not want to lose any part of the image when scaling. here is my code:
<com.android.volley.toolbox.NetworkImageView
android:id="#+id/ImageView_IssueFirstLookActivity_magas"
android:layout_width="wrap_content"
android:layout_height="170dp"
android:layout_marginLeft="32dip"
android:layout_weight="2"
android:maxWidth="40dp"
android:adjustViewBounds="true"
android:scaleType="fitStart" />
I tried all I could with different values of android:scaleType but get nowhere.
here is a figure that what I want but when I play with those properties it dose not scale it as I want for example some time it dose not show image width completely and it crops it badly. Another try for example is android:scaleType="fitStart" which cause the width of my images to be fine but the heights are not fit anymore. Any idea?

andriod ImageView attributes does not support the requirement you said just by statically choosing combination of width,height and saleType in the layout xml.
Instead you can do it in the java code by actually finding the width for the image for a given fixed height and setting them programattically to each view in dp(make sure you do the pixel to dp calculation for achieving right output, salable across devices)

If you don't mind an extra dependency, you can do it with Picasso
Picasso.get()
.load(R.drawable.my_image_resource)
.placeholder(R.drawable.ic_image_placeholder)
.error(R.drawable.ic_broken_image)
.resize(0, (int) imagefixedHeight)
// optional:
// .centerInside()
.into(myImageView);

ImageView as Mask or Parameter for images from web - How to?

I built an app and used an imageview (SmartImageView to be exactly, but i doubt that the problem) as reference for the place where I want my images to be, the thing is: the imageview has 50x50 px (set to wrap_content) but when I pull the images from web (favicons, to be exactly) if they are bigger than 60x60 instead of keeping the imageview size, they keep their own size.
I want my imageview to work as a mask and crop and/or resize the favicons to it's 50x50 size, how can I do it?
Heres the xml of the imageview:
<com.loopj.android.image.SmartImageView
android:id="#+id/favicon_placeholder"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/favicon_example2" />
And here's the java bit of code that pulls the images to it:
linkImageView.setImageUrl(link.favicon);

You are setting your height and width to wrap_content which means that it is going to resize itself to fit the content that you give it. If you want it to always be 50px no matter what size image you give it then you need to declare the size statically instead of wrap_content. And set your scaleType so the system knows how to manipulate the image should it be a different size. See here for possible values
<com.loopj.android.image.SmartImageView
android:id="#+id/favicon_placeholder"
android:layout_width="50px"
android:layout_height="50px"
android:scaleType="fitXY"
android:src="#drawable/favicon_example2" />
note that the use of the px unit is generally discouraged. dp is used more often because it can scale up or down for smaller and larger resolution devices. But if you want it to be the exact same pixels on every device then you must declare it with px

Look at ImageView.ScaleType. You may want to have a calculated size or fixed size in dp when using ImageView.ScaleType properties.

Image View doesn't show clear image defined in xml

In my code I want to set a default image for my imageview. All my images are of 174px X 174px. So, I want the default image to be same size. This is my xml for image view
//....code
<ImageView
android:id="#+id/ivCover"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:contentDescription="Default Image"
android:src="#drawable/default_cover" />
//....some other code
Now, my default_cover.jpg is also 174px X 174px. But it shows a smaller image. I've tried all
android:scaleType="centerInside"
android:scaleType="center"
android:scaleType="matrix"
even when most of them were senseless for me but still I tried all of 'em & none of them works. Then I specified the height & width of image by specifying
android:layout_width="174px"
android:layout_height="174px"
(I know using dp is better than px but because this image size is fixed & I was just testing it). So it shows
[default image]
while when loaded from an external url using
Bitmap bitmap = BitmapFactory.decodeStream((InputStream) new URL(url_source_for_image).getContent());
ivCover.setImageBitmap(bitmap);
desired image
[]
The two pictures may not look very different here but the difference is very clear on my android device. And please don't say that I didn't try other solutions..
Here is a list of links of so itself..
ImageView fit without stretching the image
Fit image into ImageView, keep aspect ratio and then resize ImageView to image dimensions?
ImageView one dimension to fit free space and second evaluate to keep aspect ration
Resizing ImageView to fit to aspect ratio
Maximum width and height for ImageView in Android
Image in ImageView is stretched - Android
Android: How to prevent image from being scaled in ImageView or ImageButton?

Sounds like the answer is to use drawable-nodpi. For future reference, if you have the same named image in both the ldpi/hdpi/etc and in no-dpi, I think the no-dpi one will be ignored.

How to create an ImageView that fills the parent height and displays an Image as big as possible?

I have an ImageView that is defined in the following way:
<ImageView
android:id="#+id/cover_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_below="#id/title"
android:layout_above="#id/divider"
android:adjustViewBounds="true"
android:src="#drawable/image_placeholder"
android:scaleType="fitStart"/>
Now after downloading a new bitmap I change the drawable. The image now appears in the top left corner of the ImageView. Is there a way to have the image fill up the whole height that is possible and then adjust the width of the view to enable scaling the image without changing the ascpect ratio?
The image fills up all the space on a standard screen but on a WVGA Resolution the image takes only about half of the actual height of the ImageView.

If I'm understanding you correctly, what you need to use is the centerCrop scaleType. fitStart scales the image proportionally, but neither the width nor height will exceed the size of the view, and the image will, as you said, have a top|left gravity.
Using centerCrop scales the image proportionally, but causes the shortest edge of the image to match the size of the view, and if there is additional data on the long side that does not fit, it is simply cropped off. The gravity is, of course, center. The below worked for me:
<ImageView
android:src="#drawable/image_placeholder"
android:id="#+id/cover_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="centerCrop"
/>

You can change scale type to fitXY via call to
imageView.setScaleType(ScaleType.FIT_XY);

simply do it in xml like
android:scaleType="fitXY"

Basically the answer here is that there is no predefined value for what you are trying to achieve. The solution is to create a Matrix that fits to your needs and call setImageMatrix(matrix) on your ImageView.

Android image scaling and alignment

I'm trying to show an image scaled while preserving its aspect ratio, but at the same time align it to the bottom.
Using android:scaleType="FitXY" causes the image to be centered vertically and horizontally, so it doesn't get aligned to the bottom.
Using "FitEnd" causes the image to be aligned to the bottom right corner, so it isn't centered horizontally.
Is there any way to get around this? Maybe using some matrix to scale it (scaleType="matrix")?
EDIT: To clarify a bit on what it is I want exactly...
I have an ImageView, whose layout (location, size, gravity, etc.) I can't change. I want to load a bitmap as its source image, but have that bitmap get scaled to the ImageView's size (preserving the aspect ratio of the bitmap) and then aligned to the ImageView's bottom.
EDIT: After trying everything I could think of (and everything that was suggested here), we ended up sub-classing ImageView and doing the scaling/translation ourselves in onDraw.

Try using android:scaleType="centerInside" instead of fitXY.
Layout being used in a Blrfl Labs application to scale an image to fit the area the layout gives it without hosing up the aspect ratio:
<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1.0"
android:gravity="center"
android:src="#drawable/blah_blah_blah"
android:scaleType="centerInside"
android:adjustViewBounds="false"
/>

You can use
android:layout_centerHorizontal="true"
android:scaleType="fitEnd"
if your ImageView is inside a RelativeLayout.

Untested, but try adding:
android:layout_gravity="bottom|center_horizontal"
to your ImageView along with FitXY scaling.