Develop Reference

ImageView static height, dynamic width

Thanks to this site, I successfully implemented a Horizontal ListView of ImageViews.
Now what I need is for the ImageViews in the list to have a fixed height (they're part of a more complex layout, so I'm using the LinearLayout weight trick to give it a height equal to 1/3 of the screen height), and a width that adjusts in relation to the height without destroying aspect ratio. The images have a longer height than width - an aspect ratio similar to a phone on portrait.
Now I've tried setting the scaleType to the different available settings, also set adjustViewBounds to true, and set the layout_width to wrap_content and layout_height to fill_parent. The nearest I got to doing it was this:
http://img849.imageshack.us/img849/1289/device20120831133004.png
(i placed the white borders as image background)
What else can be done?

Problem here is that your ImageView cannot be adjusted to desired height because it's aspect ratio is different from screen. Your view matching screen height (or 1/3 of it) and width cannot be scaled proportionally without crop.
Try to set scaleType to centerCrop and load images resized to desired height.

Setting programmatically the pixel size of a remote ImageVIew?

Let's say that I have a layout that contains
<ImageView
android:id="#+id/my_id"
android:layout_width="123px"
android:layout_height="345px"
android:padding="0dip"
android:scaleType="fitXY" />
which is used in an AppWidget and is set via a RemoteViews. How can I programmatically set the width and height in pixels (overriding the 123 and 345 in the above xml)?
(motivation: this image view shows a dynamic png file that is set at runtime via a file URL. If the layout_width and layout_height above are set to wrap_content, the image is displayed scaled down the the device's density(). Setting the exact width and height in pixels solves the problem but the file size changes and I don't know how to set it programmatically).

You can do it in a different way. Put your ImageView in a LinerLayout and set layout_width and layout_height of ImageView to "fill_parent". Then change LinearLayout's width and height.
I assume you know about app widgets size rules.

Proportionately re-sizing ImageView when width is set to fill parent

Is there a way to proportionally set the height of an ImageView if the width is set to android:layout_width="fill_parent"?
It appears there is no direct way of adjusting an ImageView without skewing one of it's dimensions. This seems bizarre given the application is expected to support a slew of screen sizes and resolutions.

You can use wrap_content for the height and set the correct scale type (either in code or via the android:scaleType attribute in XML). You are probably looking for CENTER_INSIDE/android:scaleType="centerInside".
See ImageView.ScaleType

marginRight property of imageview not working

I have an image view whose background is a xml shape drawable i.e. a rectangle shape drawable.My app's orientation is fixed to landscape view.
The imageview is in relative layout.
I am trying to move it to the right of the screen by setting the appropriate value of layout_marginRight but this does not work .The imageView always stays in its's original position.
I have tried the following other options also but none helped.
The other options which I tried are:
Creating a new relative layout params and setting the right margin
Creating new margin layout params and setting the position
Trying padding option
Setting the imageview to right position relative to another imageview...
Using display metrics to get width of screen and accordingly setting the margin....
I am stuck since a week setting the position of this imageview...
I was thinking the best approach is to set this imageview in between two imageview as I am not able to move it by setting margin but that does not work either...
Here is the current xml of my imageview in main.xml:-
<ImageView
android:id="#+id/rect1"
android:background="#drawable/rect"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginRight="70dp"
android:scaleType="fitCenter"/>

I don't see why adding a margin to the right of the image would help move the image to the right, it just extends the right side bounds of the imageview by the margin. As long as the imageview isn't actually on the right side of the parentview, it would be allowed to grow without changing position. I suggest using layout_alignParentRight="true" on the imageview if you want it on the right of your relativelayout, and then you can use the marginRight to control how far off the right side you want it.

Make the layout_width attribute of the RelativeLayout to fill_parent and see it work :)

My issue was that my parent layout's width was set to wrap_content, which doesn't have a defined width during the editor, I think. Thus, I couldn't use marginRight to get an offset. I had to change the width to a fixed size like match_parent or a constant dp size.

put the image view in a linearlayout, then use android:layout_marginRight="70dp

How to Change size of ImageView Dynamically?

I am creating a dynamic table whose rows contains a imageview and a textview. My problem is this imageview is taking full size of original image but I want to change the size of imageview.I have used setLayoutParams which has no effect.
As an alternative I also used textview instead of imageview and set image as textview's background and used setWidth and setHeight but it has the same problem.
Plz Help Me.

Have you tried the scaleType-Attribute?
Check out the setMaxWidth and setMaxHeight-methods of the ImageView-class:
To set an image to be a maximum of 100
x 100 while preserving the original
aspect ratio, do the following: 1) set
adjustViewBounds to true 2) set
maxWidth and maxHeight to 100 3) set
the height and width layout params to
WRAP_CONTENT.
Link

Assuming your image is a drawable resource, you can use ScaleDrawable instead, and use the xml attributes android:scaleHeight and android:scaleWidth to shrink your image.

OK I found the Solution
Resizing an ImageView within a TableLayout programmatically

Try changing your ImageView's layout_width and layout_height inside the layout file to some constant values measured in sp, for example 100sp. This will make all ImageViews look the same.