Android ApiDemos示例解析(18) App->Activity->Wallpaper

Wallpaper介紹一個Activity如何通過Style把系統Wallpaper作為當前Activity的背景。

這是WallpaperActivity在 AndroidManifest.xml中的定義：

<activity android:name=”.app.WallpaperActivity”

android:label=” @string/activity_wallpaper”

android:theme=”@style/Theme.Wallpaper”>

<intent-filter>

< action android:name=”android.intent.action.MAIN” />

<category android:name=” android.intent.category.SAMPLE_CODE” />

< /intent-filter>

< /activity>

@style/Theme.Wallpaper定義如下：繼承系統android:style/Theme.Wallpaper，並將前景色設為白色（ 這裡是文字的顏色）

<!– A theme that has a wallpaper background.  Here we explicitly specify

that this theme is to inherit from the system’s wallpaper theme,

which sets up various attributes correctly. –>

<style name=”Theme.Wallpaper” parent=”android:style/Theme.Wallpaper”>

<item name=”android:colorForeground”>#fff</item>

< /style>