How can i remove the drop shadow of action bar from java code ?.

如果我删除它做工精细的风格。

If i remove from the style it is working fine.

<style name="MyTheme" parent="Theme.Sherlock">
....
<item name="windowContentOverlay">@null</item>
<item name="android:windowContentOverlay">@null</item>
....
</style>

但我需要删除并动态地从Java code添加。

But i need to remove and add it dynamically from java code.

推荐答案

有没有办法设置值 windowContentOverlay 属性编程。但是你可以定义两个不同的主题，一个是有明显的动作条阴影活动，一个为他人：

There is no way to set value for windowContentOverlay attribute programmatically. But you can define two different themes, one for Activities with a visible ActionBar shadow and one for others:

<!-- Your main theme with ActionBar shadow. -->
<style name="MyTheme" parent="Theme.Sherlock">
    ....
</style>

<!-- Theme without ActionBar shadow (inherits main theme) -->
<style name="MyNoActionBarShadowTheme" parent="MyTheme">
    <item name="windowContentOverlay">@null</item>
    <item name="android:windowContentOverlay">@null</item>
</style>

现在，你可以将其设置为活动的Andr​​oidManifest.xml ：

Now you can set them to activities in AndroidManifest.xml:

<!-- Activity with ActionBar shadow -->
<activity
    android:name=".ShadowActivity"
    android:theme="@style/MyTheme"/>

<!-- Activity without ActionBar shadow -->
<activity
    android:name=".NoShadowActivity"
    android:theme="@style/MyNoActionBarShadowTheme"/>

或者你也可以在的onCreate编程设置正确的主题（）方法：

@Override
protected void onCreate(Bundle savedInstanceState) {
    setTheme(R.style.MyNoActionBarShadowTheme);
    super.onCreate(savedInstanceState);

    //...
}