ImageView adjustViewBounds not working

Question

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> 

Answer 1

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.

Answer 2

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); }