How do I keep the aspect ratio on image buttons in android?

Question

I have 5 square ImageButtons that I want to have lined up side by side on the bottom of the screen. I have each one set (different id's) as:

        <ImageButton
         android:id="@+id/box1" 
         android:layout_width="fill_parent"
         android:layout_height="wrap_content" 
         android:layout_gravity="center"
         android:adjustViewBounds="true"
         android:scaleType="fitXY"
         android:layout_weight="1"
         android:layout_margin="1dp"
         /> 

and I have the background assigned in main java like this:

    int[] imageIds = new int[] {R.id.box1,R.id.box2,R.id.box3,R.id.box4,R.id.box5};
    for(int i = 0; i<5; i++){
        imageButtons[i] = (ImageButton) findViewById(imageIds[i]);
        imageButtons[i].setBackgroundResource(R.drawable.blank);
    }

What I would like to have it do is scale the width to fit neatly side-by-side at the bottom of the screen (which it does now ok), but have the height automatically scale to match the width as well. is this possible? I don't want to use setImageSource because then it puts a border around the imagebutton.

Answer 1

   <LinearLayout
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:id="@+id/layoutButtons">

     <com.package.SquareButton         
        android:layout_height="fill_parent"
        android:layout_width="0dip"          
        android:layout_weight="1"

        <ImageView
        android:id="@+id/box1"
        android:layout_gravity="center"
        android:adjustViewBounds="true"
        android:scaleType="centerInside"
        android:layout_height="wrap_content"
        android:layout_width="0dp"          
        android:layout_weight="1" 
        android:layout_marginLeft="5dp" 
        android:layout_marginRight="5dp"/>

      </com.package.SquareButton>

      <com.package.SquareButton         
        android:layout_height="fill_parent"
        android:layout_width="0dip"          
        android:layout_weight="1"

        <ImageView
        android:id="@+id/box2"
        android:layout_gravity="center"
        android:adjustViewBounds="true"
        android:scaleType="centerInside"
        android:layout_height="fill_parent"
        android:layout_width="fill_parent"          
        android:layout_marginLeft="5dp" 
        android:layout_marginRight="5dp"/>

</com.package.SquareButton>

   .........          
 </LinearLayout>

And then add this custom button class:

public class SquareButton extends LinearLayout {

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

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

    // This is used to make square buttons.
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, widthMeasureSpec);
    }
}