关于Tabhost怎么更改下划线长度和颜色

修改当前Activity的主题里的 @style/Widget.Holo.TabWidget

修改tabLayout这一项

<item name="tabStripLeft">@null</item> <item name="tabStripRight">@null</item> <item name="tabStripEnabled">false</item> <item name="divider">?attr/dividerVertical</item> <item name="showDividers">middle</item> <item name="dividerPadding">8dip</item> <item name="measureWithLargestChild">true</item> <item name="tabLayout">@layout/tab_indicator_holo</item>

    默认的布局如下
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="?android:attr/actionBarSize"
android:orientation="horizontal"
style="@android:style/Widget.Holo.Tab">

<ImageView
    android:id="@android:id/icon"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    android:visibility="gone" />

<TextView
    android:id="@android:id/title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    style="@android:style/Widget.Holo.TabText" />

修改LinearLayout的stytle

修改其中background背景这一项

<item name="background">@drawable/tab_indicator_holo</item> <item name="layout_width">0dip</item> <item name="layout_weight">1</item> <item name="minWidth">80dip</item>

    默认的背景如下
    <selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Non focused states -->
<item android:state_focused="false" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/tab_unselected_holo" />
<item android:state_focused="false" android:state_selected="true"  android:state_pressed="false" android:drawable="@drawable/tab_selected_holo" />

<!-- Focused states -->
<item android:state_focused="true" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/tab_unselected_focused_holo" />
<item android:state_focused="true" android:state_selected="true"  android:state_pressed="false" android:drawable="@drawable/tab_selected_focused_holo" />

<!-- Pressed -->
<!--    Non focused states -->
<item android:state_focused="false" android:state_selected="false" android:state_pressed="true" android:drawable="@drawable/tab_unselected_pressed_holo" />
<item android:state_focused="false" android:state_selected="true"  android:state_pressed="true" android:drawable="@drawable/tab_selected_pressed_holo" />

<!--    Focused states -->
<item android:state_focused="true" android:state_selected="false" android:state_pressed="true" android:drawable="@drawable/tab_unselected_pressed_holo" />
<item android:state_focused="true" android:state_selected="true"  android:state_pressed="true" android:drawable="@drawable/tab_selected_pressed_holo" />

http://blog.csdn.net/huohao_blogs/article/details/72638319