Creating an activity with navigation drawer in Android Studio causes this to be shown in the XML code:
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
If I remove the tools:openDrawer="start"
, on the layout preview, the navigation drawer will be closed instead of open.
I thought this was a replacement attribute, similar to android:text
that can be replaced with tools:text
to put some placeholder text in the layout preview. But when I change it to android:openDrawer
or app:openDrawer
, the app can't be compiled because they are unknown attributes.
So I wonder how tools:openDrawer
works, and whether it is documented anywhere.
This means that
tools
attribute is used by the IDE and not used in the code functionality.I am still trying to find the complete documentation of all
tools
attributes. I can't find out theopenDrawer
attribute anywhere. But the following are great documentation ontools
:http://tools.android.com/tech-docs/tools-attributes
http://tools.android.com/tips/layout-designtime-attributes
UPDATE
Now a complete documentation of all
tools
attribute is available here.