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                #### 6.2.5 LevelListDrawable LevelListDrawable對應于`<level-list>`標簽,它同樣表示一個Drawable集合,集合中的每個Drawable都有一個等級(level)的概念。根據不同的等級,LevelListDrawable會切換為對應的Drawable,它的語法如下所示。 <? xml version="1.0" encoding="utf-8"? > <level-list xmlns:android="http://schemas.android.com/apk/res/android" > <item android:drawable="@drawable/drawable_resource" android:maxLevel="integer" android:minLevel="integer" /> </level-list> 上面的語法中,每個item表示一個Drawable,并且有對應的等級范圍,由android:min-Level和android:maxLevel來指定,在最小值和最大值之間的等級會對應此item中的Drawable。下面是一個實際的例子,當它作為View的背景時,可以通過Drawable的setLevel方法來設置不同的等級從而切換具體的Drawable。如果它被用來作為ImageView的前景Drawable,那么還可以通過ImageView的setImageLevel方法來切換Drawable。最后,Drawable的等級是有范圍的,即0~10000,最小等級是0,這也是默認值,最大等級是10000。 <? xml version="1.0" encoding="utf-8"? > <level-list xmlns:android="http://schemas.android.com/apk/res/android" > <item android:drawable="@drawable/status_off" android:maxLevel="0" /> <item android:drawable="@drawable/status_on" android:maxLevel="1" /> </level-list>
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