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scaling – Android imageview not respecting maxWidth?

Posted by: admin March 11, 2020 Leave a comment

Questions:

So, I have an imageview that should display an arbitrary image, a profile picture downloaded from the internet. I want this the ImageView to scale its image to fit inside the height of the parent container, and a set max width of 60dip. However, if the image is tall ratio-wise, and doesn’t need the full 60dip of width, the ImageView’s width should decrease so the view’s background fits snugly around the image.

I tried this,

<ImageView android:id="@+id/menu_profile_picture"
    android:layout_width="wrap_content"
    android:maxWidth="60dip"
    android:layout_height="fill_parent"
    android:layout_marginLeft="2dip"
    android:padding="4dip"
    android:scaleType="centerInside"
    android:background="@drawable/menubar_button"
    android:layout_centerVertical="true"/>

but that made the ImageView super large for some reason, maybe it used the intrinsic width of the image and wrap_content to set it – anyway, it didn’t respect my maxWidth attribute.. Does that only work inside some types of containers? It’s in a LinearLayout…

Any suggestions?

How to&Answers:

Ah,

android:adjustViewBounds="true"

is required for maxWidth to work.

Works now!

Answer:

Setting adjustViewBounds does not help if you use match_parent, but workaround is simple custom ImageView:


public class LimitedWidthImageView extends ImageView {
    public LimitedWidthImageView(Context context) {
        super(context);
    }

    public LimitedWidthImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public LimitedWidthImageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int specWidth = MeasureSpec.getSize(widthMeasureSpec);
        int maxWidth = getMaxWidth();
        if (specWidth > maxWidth) {
            widthMeasureSpec = MeasureSpec.makeMeasureSpec(maxWidth,
                    MeasureSpec.getMode(widthMeasureSpec));
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}