我在一个背景图像的条上有四个按钮。我想要做的是增加按钮之间的间距(使它们分散在整个条上),并将重力设置为center_horizontal。我尝试在ImageButtons(okcancelbar_button_home)本身上使用paddingLeft和paddingRight,但似乎没有任何作用。我想也许是Image Buttons的父级是关键,但我不知道应该设置什么。以下是我的布局:
///////// main .xml //////////////////
<merge
xmlns:android="http://schemas.android.com/apk/res/android">
<com.onesix.test.OkCancelBar
android:layout_width="fill_parent"
android:layout_height="60dip"
android:layout_gravity="top"
android:paddingTop="0dip"
android:gravity="center_horizontal"
android:background="@drawable/header_bkgrnd"
/>
<!--"#AA000000"-->
</merge>
////////// okCancelBar ////////////////
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<include
layout="@layout/okcancelbar_button_home"
android:id="@+id/okcancelbar_home"
android:layout_height="90dip" />
<include
layout="@layout/okcancelbar_button_lists"
android:id="@+id/okcancelbar_lists"
android:layout_height="90dip"
/>
<include
layout="@layout/okcancelbar_button_calendar"
android:id="@+id/okcancelbar_calendar"
android:layout_height="90dip"
/>
<include
layout="@layout/okcancelbar_button_search"
android:id="@+id/okcancelbar_search"
android:layout_height="90dip"
/>
</merge>
////////////// okcancelbar_button_home ////////////////
<?xml version="1.0" encoding="utf-8"?>
<ImageButton
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/but_home"
android:layout_width="75dip"
android:layout_height="60dip"
android:layout_alignParentBottom="true"
android:background="@android:color/transparent"
android:src="@drawable/button_menu_states_home"
android:paddingLeft="7dip"
android:paddingRight="7dip"
/>
////////////button_menu_states_home/////////
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"
android:drawable="@drawable/menu_button_home1_over" /> <!-- pressed -->
<item android:state_focused="true"
android:drawable="@drawable/menu_button_home1_over" /> <!-- focused -->
<item android:drawable="@drawable/menu_button_home1" /> <!-- default -->
</selector>