Android view dithering

As you can see from the screenshot below, the "titlebar" 开发者_如何学Gois getting these ugly banding lines across the areas with text that extend the entire width of the screen. It's even more noticeable on a real device.

Is there any way to work around this?

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From Android Developers: Widget Design Guidelines:

In some cases, devices have low pixel depths that can cause visual banding and dithering issues. To solve this, application developers should pass assets through a "proxy" drawable defined as XML:. This technique references the original artwork, in this case "background.9.png", and instructs the device to dither it as needed.

EDIT: Example source. This is an xml file in your res/drawables directory:

<?xml version="1.0" encoding="UTF-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
    android:src="@drawable/title_bar_medium"
    android:dither="true" />

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Add android:tileMode="repeat" in this code, like this -

<?xml version="1.0" encoding="UTF-8"?>
<bitmap
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:src="@drawable/b1"
    android:tileMode="repeat"
    android:dither="true" />

Reason is, on some devices it still stretches the image and it looks pretty bad, check this Reference here