Unable To Make Toolbar Transparent In Android

My tool bar always stays gray when I try to set the background as transparent. Here is my XML.

1. Define a layout for your activity like below
2. Make sure the Toolbar is at the bottom of the XML so it'll be on top in the z-order.
3. Use RelativeLayout so you can make sure the Toolbar is visually at the top left on the screen.
4. @color/primary should be transparent (#00000000) OR you can set it in code if you need to use other colors as well.

5. (OPTIONALLY) Either add "android:layout_marginTop="?android:attr/actionBarSize" to the container below OR add it in your code. Otherwise, some of the content in the FrameLayout will be underneath the action bar.

   <android.support.v4.widget.DrawerLayout
       android:id="@+id/drawer_layout"
       android:layout_width="match_parent"
       android:layout_height="match_parent">
   
       <FrameLayout
           android:id="@+id/container"
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           />
   
       <ListView android:id="@+id/left_drawer"
           android:layout_width="260dp"
           android:layout_height="match_parent"
           android:layout_gravity="start"
           android:layout_marginRight="8dp"
           android:layout_marginTop="?android:attr/actionBarSize"
           android:choiceMode="singleChoice"
           android:divider="@android:color/transparent"
           android:dividerHeight="0dp"
           android:background="@color/drawer_background"
           />
   
   </android.support.v4.widget.DrawerLayout>
   
   <android.support.v7.widget.Toolbar
       android:id="@+id/toolbar"
       android:layout_width="match_parent"
       android:layout_height="?android:attr/actionBarSize"
       android:layout_alignParentLeft="true"
       android:layout_alignParentTop="true"
       android:background="@color/primary"
       />
   

Solution 2:

for the latest update of android x

use @color/transparent = #00000000

use of

android:background="@color/transparent"android:elevation="0dp"app:elevation="0dp"

on appbar

example layout

<?xml version="1.0" encoding="utf-8"?><layoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"><androidx.drawerlayout.widget.DrawerLayoutandroid:id="@+id/drawer_layout"android:layout_width="match_parent"android:layout_height="match_parent"android:fitsSystemWindows="true"><androidx.constraintlayout.widget.ConstraintLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><com.google.android.material.appbar.AppBarLayoutandroid:id="@+id/appbar"android:layout_width="match_parent"android:layout_height="wrap_content"app:layout_constraintTop_toTopOf="parent"android:background="@color/transparent"android:elevation="0dp"app:elevation="0dp"
                ><androidx.appcompat.widget.Toolbarandroid:id="@+id/toolbar"android:layout_width="match_parent"android:layout_height="?attr/actionBarSize"app:titleMarginStart="@dimen/margin_big"

                    /></com.google.android.material.appbar.AppBarLayout><fragmentandroid:id="@+id/nav_fragment"android:name="androidx.navigation.fragment.NavHostFragment"android:layout_width="match_parent"android:layout_height="match_parent"app:defaultNavHost="true"app:navGraph="@navigation/nav_main"
                /><com.google.android.material.bottomnavigation.BottomNavigationViewandroid:id="@+id/bottom_nav"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_gravity="bottom"android:background="@color/bottom"app:menu="@menu/navigation"app:layout_constraintBottom_toBottomOf="parent"
                /></androidx.constraintlayout.widget.ConstraintLayout><com.google.android.material.navigation.NavigationViewandroid:id="@+id/nav_view"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_gravity="start"app:menu="@menu/navigation"
            /></androidx.drawerlayout.widget.DrawerLayout></layout>