android plain white background without gradient

问题:

I have set the background of my Android app to white and used the light theme to try and get a white background. I did so by setting the following attributes in the Manifest:

android:background="@android:color/white"
android:theme="@android:style/Theme.Light.NoTitleBar.Fullscreen"

This gives me a white background but there is also a color gradient from light gray to white. I would like to have the background a plain solid white with no gradient. Is there some way of easily achieving this?

回答1:

You've got a lot of different ways to do it. Just pick one, though.

Option 1

Set the background of each of your layouts to be android:background="@android:color/white" or android:background="#ffff".

Option 2

If you don't want to maintain this across your app, you could use android:background="@color/background" then make a resource file with <color name='background'>#ffff</color>.

Option 3

Another alternative is to make a FrameLayout file which you always use in setContentView() and which has your background color (as per option 1), then inflate your other layouts within it.

Option 4

You can do it through Java code, using layout.setBackgroundColor(Color.rgb(255, 255, 255));.

Option 5

Extend the theme and change its background:

<style name="AppTheme" parent="android:Theme.Light.NoTitleBar.Fullscreen">
  <item name="android:background">@android:color/white</item>
  <item name="android:windowBackground">@android:color/white</item>
  <item name="android:colorBackground">@android:color/white</item>
</style>

Then, in your manifest,

android:theme="@style/AppTheme"