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I want to use an elevation in a custom layout element and I want to set in XML the value of that element using the default action bar elevation value. I can't find a way to get it in XML and I'd like to avoid to call getElevation() in code. Any tips?
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The default elevation of the action bar is 4dp.
To use the ActionBar utility methods, call the activity's getSupportActionBar() method. This method returns a reference to an appcompat ActionBar object. Once you have that reference, you can call any of the ActionBar methods to adjust the app bar. For example, to hide the app bar, call ActionBar.
This example demonstrate about how to create a custom action bar in Android. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main. xml.
The key differences that distinguish the Toolbar from the ActionBar include: Toolbar is a View included in a layout like any other View. As a regular View , the toolbar is easier to position, animate and control. Multiple distinct Toolbar elements can be defined within a single activity.
Default value is 8dp, create dimen with this value and use on whole project, I got it from sources, but the material design guidelines state the action bar elevation should be 4dp. 
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The standard elevation of the app bar is 4dp according to material design spec. Here is the link: https://material.io/guidelines/material-design/elevation-shadows.html#elevation-shadows-shadows
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