In one of the projects, client require to built a design where a secondary drawer will opened over already opened primary drawer.
As per Android Material Design guidelines its not recommended and its not implemented in android.support.v4.widget.DrawerLayout. If we try to implement it in code like following, it throws exception, only one drawer can be shown.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<!-- Layout to contain contents of main body -->
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!-- First container for drawer contents -->
<android.support.design.widget.NavigationView
android:id="@+id/first_nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true" />
<!-- Second container for drawer contents -->
<android.support.design.widget.NavigationView
android:id="@+id/second_nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true" />
</android.support.v4.widget.DrawerLayout>To show both drawers from same side we need to extend the android.support.v4.widget.DrawerLayout to handle the navigation of secondary drawer over primary.