Background image quality

I want to apply a background image to a linear layout and I have problems because the image loose from quality when stretched.

The image is composed by the fill color and some dots pattern applied over the background. enter image description here

The image was made with Adobe Illustrator (png). Also I tried using nine-patch but does not work, the dots are stretched.

Should I make this background from code(override onDraw from the linear layout)?

Solution

I'm guessing you want to repeat that pattern, not stretch it. Create a drawable resource in xml form, representing your tiled background:

<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
    android:tileMode="repeat"
    android:src="@drawable/background_image"
/>