The color of Android--button

. xml

<?XML version= "1.0" encoding= "Utf-8"?><LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"android:orientation= "vertical">    <ButtonAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "Call"Android:id= "@+id/phone" android:background= "@drawable/anniu1"        />    <ButtonAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "Do not dial the phone"Android:background= "@drawable/anniu2"        />    <ButtonAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "Call" android:drawableleft= "@drawable/anniu5"         />        <ButtonAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "Do not dial the phone" android:drawableright= "@drawable/anniu6"             />       <ImageButton   Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"android:src = "@drawable/anniu3"            /></LinearLayout>

The color of Android--button