键盘按钮效果

 <RelativeLayout         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_weight="1"        android:gravity="center"        >         <ImageButton                 android:id="@+id/dial_num_1"                android:layout_width="fill_parent"                android:layout_height="fill_parent"                android:background="@drawable/bottom_selector"/>         <ImageView            android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_weight="1"                android:layout_centerInParent="true"                android:background="@drawable/dial_num_1_pressed"             />    </RelativeLayout>

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<selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:state_pressed="true" android:drawable="@drawable/btn_list_item_pressed" /> <!-- pressed --><item android:state_focused="true" android:drawable="@drawable/btn_list_item_pressed" /> <!-- focused --><item android:drawable="@drawable/btn_list_item_normal" /> <!-- default --></selector>

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