Xml代码1         <ImageButton   2                        android:id="@+id/player_sound" 3                        android:layout_width="55px"   4                        android:layout_height="55px" 5                        android:layout_marginTop="2px" 6                        android:focusable="true" 7                        android:layout_marginLeft="16px" 8                        android:src="@drawable/soundonbutton"/> <!--background也可以-->    android:src="@drawable/soundonbutton"   soundonbutotn如下：Xml代码9         <selectorxmlns:android="https://schemas.android.com/apk/res/android">   10       11     <item   12     android:drawable="@drawable/tab_unselected"   13     android:state_selected="false"   14     android:state_pressed="false"/>   15       16     <item   17     android:drawable="@drawable/tab_unselected"   18     android:state_selected="false"   19     android:state_pressed="true"/>   20       21     <item   22     android:drawable="@drawable/tab_selected"   23     android:state_selected="true"/>   24       25     </selector>