ActionBar Back Button to Navigation Button

Question

Hello, I'm using the default drawer template from visual studio for my Android App. When I set the drawer hamburger Icon to show as a back arrow: SupportActionBar.SetDisplayUseLogoEnabled(false); SupportActionBar.SetDisplayHomeAsUpEnabled(true); I get the back arrow: /AppTheme.AppBarOverlay"> <androidx.appcompat.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" android:background="?attr/colorPrimary" app:popupTheme="@STYLE /AppTheme.PopupOverlay" /> </com.google.android.material.appbar.AppBarLayout> <include layout="@layout/base_content" /> <!-- <com.google.android.material.floatingactionbutton.FloatingActionButton android:id="@+id/fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin" app:srcCompat="@Krak ruiz :drawable/ic_dialog_email" />--> </androidx.coordinatorlayout.widget.CoordinatorLayout> [1]: /api/attachments/81903-image.png?platform=QnA

Answer 1

've read some blogs about you have to catch the OnOptionsItemSelected event ... But this doesn't get fired when I click the back arrow.

The OnOptionsItemSelected event is to detect the toolbar of the Activity. But the default drawer template from VS place the toolbar inside the DrawerLayout. To fix this, please move the Toolbar outside the DrawerLayout las below.

<LinearLayout 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:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.appcompat.widget.Toolbar  
        android:id="@+id/toolbar"  
        android:layout_width="match_parent"  
        android:layout_height="wrap_content"  
        android:minHeight="?attr/actionBarSize"  
        android:background="#33B86C"  
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"  
        app:layout_scrollFlags="scroll|enterAlways" />  

    <androidx.drawerlayout.widget.DrawerLayout
        android:id="@+id/drawer_layout"  
        android:layout_height="match_parent"  
        android:fitsSystemWindows="true"  
        android:layout_width="match_parent">  
        <RelativeLayout  
            android:orientation="vertical"  
            android:layout_width="match_parent"  
            android:layout_height="match_parent" />  
        <com.google.android.material.navigation.NavigationView
            android:id="@+id/nav_view"  
            android:layout_height="match_parent"  
            android:layout_width="200dp"  
            android:layout_gravity="start"  
            android:fitsSystemWindows="true"  
            app:menu="@menu/_menu" />  
    </androidx.drawerlayout.widget.DrawerLayout>  
</LinearLayout>