android:windowNoTitle will not hide actionbar with appcompat-v7 21.0.0

问题

I updated appcompat-v7 to lollipop version(21.0.0)

then I can't hide ActionBar with following style that worked before.

<style name="AppTheme.NoActionBar">
    <item name="android:windowActionBar">false</item>
    <item name="android:windowNoTitle">true</item>
</style>

I set it to specific activity.

<activity android:name=".NoActionBarActivity"
        android:theme="@style/AppTheme.NoActionBar"/>

When I use appcompat-v7 20.0.0 version, actionbar will be hidden as it is intended.

How can I hide actionbar with custom style with AppCompat version 21 library?

回答1:

@Chk0nDanger your answer is true but you should use below code :

<style name="Theme.AppCompat.NoActionBar" parent="Theme.AppCompat.Light">
   <item name="windowActionBar">false</item>
   <item name="android:windowNoTitle">true</item>
</style> 

without parent element, everything will be white color (textviews,buttons,chekcboxs, etc)!

in your manifest.xml file :

    <activity android:name=".MyClass"
        android:theme="@style/Theme.AppCompat.NoActionBar"
        />

updated 2015 29 July

make sure android:windowNoTitle should be replaced by windowNoTitle when Upgraded to AppCompat v22.1.0

回答2:

OK, I found the answer.

There is Theme.AppCompat.NoActionBar theme in appcompat-v7:21.0.0. It is defined as following.

<style name="Theme.AppCompat.NoActionBar">
   <item name="windowActionBar">false</item>
   <item name="android:windowNoTitle">true</item>
</style>

There is no android prefix in windowActionBar attribute.

来源：https://stackoverflow.com/questions/26878386/androidwindownotitle-will-not-hide-actionbar-with-appcompat-v7-21-0-0