Question

I have simply extended the ImageView so an image goes full width. Like so:..

public class BannerImageView extends ImageView {

    public BannerImageView(Context context) {
        super(context);
    }

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

    public BannerImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int width = MeasureSpec.getSize(widthMeasureSpec);
        int height = width * getDrawable().getIntrinsicHeight() / getDrawable().getIntrinsicWidth();
        setMeasuredDimension(width, height);
    }
}

In XML I have declared it as follows:

<com.whatever.next.BannerImageView
      android:id="@+id/banner"
      android:src="@+drawable/logo"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content" />

I receive the following errors:

main.xml: Unable to resolve drawable “com.android.layoutlib.bridge.ResourceValue@48537a0f” in attribute “src”

then I get the expected null pointer exceptions.

I am confused as I thought since I am not altering the default behaviour of the ImageView it would show in the graphical layout. I have read through the other similar questions and that confused me some more.

For the record the above code works fine on an actual device.

Any help is appreciated!

Answer 1

instead of

android:src="@+drawable/logo"

use

android:src="@drawable/logo"

No + for the src attribute