Android view dithering

问题

As you can see from the screenshot below, the "titlebar" is 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?

回答1:

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" />

回答2:

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

来源：https://stackoverflow.com/questions/2210976/android-view-dithering