选项卡部件如何改变选项卡底部线条颜色

Question

我想改变“选项卡底部线条颜色”，我按照以下步骤进行：
1. 在我的styles.xml文件中，我有：

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="android:actionBarTabStyle">@style/ActionBarTabStyle.Dgrey</item>
    </style>

    <style name="ActionBarTabStyle.Dgrey" parent="@android:style/Widget.Holo.ActionBar.TabView">
        <item name="android:background">@drawable/tab_indicator_ab_dgrey</item>
    </style>

</resources>

我有一个 tab_indicator_ab_dgrey，它有以下内容：

<?xml version="1.0" encoding="utf-8"?>

<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_dgrey" />
    <item android:state_focused="false" android:state_selected="true"  android:state_pressed="false" android:drawable="@drawable/tab_selected_dgrey" />

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

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

    <!--    Focused states -->
    <item android:state_focused="true" android:state_selected="false" android:state_pressed="true" android:drawable="@drawable/tab_unselected_pressed_dgrey" />
    <item android:state_focused="true" android:state_selected="true"  android:state_pressed="true" android:drawable="@drawable/tab_selected_pressed_dgrey" />
</selector>

3. 在我drawable文件夹（hdpi，mdpi，xhdpi，xxhdpi）中有以下文件：
- tab_selected_dgrey.9.png
- tab_selected_focused_dgrey.9.png
- tab_selected_pressed_dgrey.9.png
- tab_unselected_dgrey.9.png
- tab_unselected_focused_dgrey.9.png
- tab_unselected_pressed_dgrey.9.png

并且在我的drawable文件夹中有：
tab_indicator_ab_dgrey.xml文件

4. and at the end, this is my manifest.xml:

   <application
       android:allowBackup="true"
       android:icon="@drawable/ic_launcher"
       android:label="@string/app_name"
       android:theme="@style/AppTheme" >
       <activity
           android:name="ch.studentgrades.StudentGrades"
           android:label="@string/app_name" >
           <intent-filter>
               <action android:name="android.intent.action.MAIN" />
   
               <category android:name="android.intent.category.LAUNCHER" />
           </intent-filter>
       </activity>
   </application>
   

我不知道为什么（我跟着教程做了），但当我运行这个应用程序时，它没有做出任何更改，选项卡底部的颜色仍然是蓝色。

- Giovanni Far

Answer 1

这个答案解决了我的问题。

在设置选项卡后添加以下代码：

TabHost host = (TabHost)view.findViewById(R.id.tab_host);
TabWidget widget = host.getTabWidget();
for(int i = 0; i < widget.getChildCount(); i++) {
    View v = widget.getChildAt(i);

    // Look for the title view to ensure this is an indicator and not a divider.
    TextView tv = (TextView)v.findViewById(android.R.id.title);
    if(tv == null) {
        continue;
    }
    v.setBackgroundResource(R.drawable.tab_indicator_ab_dgrey);
}

那么，您可以从您的styles.xml中删除以下代码：

<item name="android:actionBarTabStyle">@style/ActionBarTabStyle.Dgrey</item>

并且

<style name="ActionBarTabStyle.Dgrey" parent="@android:style/Widget.Holo.ActionBar.TabView">
    <item name="android:background">@drawable/tab_indicator_ab_dgrey</item>
</style>

- The.Blue.Shrimp