Scale image keeping its aspect ratio in background drawable

tilex picture tilex · Mar 27, 2012 · Viewed 89.8k times · Source

How do I make a background image fit the view but keep its aspect ratio when using <bitmap /> as a background drawable XML? None of <bitmap>'s android:gravity values gives the desired effect.

Answer

a.ch. picture a.ch. · Mar 27, 2012

It is impossible to achieve manipulating background attribute within xml-files only. There are two options:

  1. You cut/scale the bitmap programmatically with Bitmap.createScaledBitmap(Bitmap src, int dstWidth, int dstHeight, boolean filter) and set it as some View's background.

  2. You use ImageView instead of background placing it as the first layout's element and specify android:scaleType attribute for it:

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
    
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
    
            android:src="@drawable/backgrnd"
            android:scaleType="centerCrop" />
    
        ...
    
        rest layout components here
    
        ...
    
    </RelativeLayout>