Remove action bar shadow programmatically

Question

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

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>

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

Answer 1

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>

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"/>

Or you can set the right theme programmatically in onCreate() method:

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

    //...
}