Develop Reference

How to make my fragment fit between my toolbar and bottom navigation bar and still make it scrollable?

So I will have my main-activity layout file below so you can understand what is happening
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<include
android:id="#+id/toolbar"
layout="#menu/toolbar"/>
<FrameLayout
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/bottom_nav">
</FrameLayout>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottom_nav"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
app:menu="#menu/bottom_navigation"
app:itemIconTint="#android:color/white"
android:background="#39b54a"
app:labelVisibilityMode="unlabeled">
</com.google.android.material.bottomnavigation.BottomNavigationView>
</RelativeLayout>
The problem with this layout is that the toolbar on the top and the bottom navigation bar cover content from my fragments. Also one of my fragments has got a recyclerview with many items and I can´t scroll down for some reason ? Is there a way to make the fragments fit exactly between the toolbar and bottomnavigation like resizing itself to fit into that area without cutting content and still make it scrollable ?

Do it like this ...
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<include
android:id="#+id/toolbar"
layout="#layout/toolbar_layout"/> <!--include your layout file here -->
<FrameLayout
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_below="#id/toolbar"
android:layout_height="match_parent"
android:layout_above="#+id/bottom_nav">
</FrameLayout>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottom_nav"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
app:menu="#menu/bottom_nav_menu"
app:itemIconTint="#android:color/white"
android:background="#39b54a"
app:labelVisibilityMode="unlabeled">
</com.google.android.material.bottomnavigation.BottomNavigationView>
</RelativeLayout>
And by the way, you are supposed to set a layout resource file into the toolbar layout while including but you are passing the menu resource file. Change that also accordingly...

What is a "Top-level destination" in android?

I am working in Android Studio using Java. I want to implement a Navigation Drawer(those left to right swipe ones) with a Hamburger icon always on top. But there is some issue of "Top-level destination" without which that Hamburger icon doesn't show up. One of the solutions I found was to make that activity as my Launcher activity but I don't want that.
Can someone please explain to me what this "Top-level destination" phrase means and a possible workaround for my Navigation Drawer problem!!
This is my navigation layout
<androidx.drawerlayout.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:layout_width="match_parent"
android:id="#+id/drawer_layout"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:visibility="visible"
tools:context=".Main_Screen"
tools:openDrawer="start">
<include
layout="#layout/app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<com.google.android.material.navigation.NavigationView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="#+id/nav_view"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:menu="#menu/drawer_menu"
app:headerLayout="#layout/drawer_header"
/>
</androidx.drawerlayout.widget.DrawerLayout>
this is the included appbar
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
style="#style/Widget.MaterialComponents.AppBarLayout.Primary">
<androidx.appcompat.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:id="#+id/toolbar"
app:contentInsetStartWithNavigation="0dp" />
</com.google.android.material.appbar.AppBarLayout>
</LinearLayout>

I have created an activity named LoginActivity, where I just put a button, and created an activity named MainActivity, where I put drawer. By clicking the button, I start the MainActivity.
In fact, I have not recurrented the problem you have said above.
But I have a suggestion that you may try creating the activity with drawer by file template not by hand, to avoid some mistakes that we have not discovered.
The step is: Right click the package name -> New -> Activity -> Navigation Drawer Activity.

Appbar not hiding when recyclerview scrolled

I am trying to hide appbar when user scrolled recyclerview layout code as per follows:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:fitsSystemWindows="true"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/my_appbar_container"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<include
android:layout_width="fill_parent"
android:layout_height="wrap_content"
layout="#layout/plp_header_card_view"
app:layout_scrollFlags="scroll|enterAlways" />
</LinearLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/item_list_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:scrollbars="none" />
</android.support.design.widget.CoordinatorLayout>
I want to hide appbar when this screen intialize & show appbar when user scroll the recyclerview. Please help me to do this one.

The below code is proper way to make toolbar hide when the scroll down.
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/tabanim_appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/tabanim_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways|snap"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>

Apply app:layout_scrollFlags="scroll|enterAlways" on LinearLayout work hide action recycleview scroll.
But you question is hide appbar when this screen intialize & show appbar when user scroll the recyclerview
My suggestion as belowit will help you to achieved target
1. Hide and show toolbar on scroll
2. you can use CollapsingToolbar

Floating action button anchor

I need to anchor floating action button in android, but have the trouble:
fab will be in navigationview
Here is my activity_main layout.
It includes navigation drawer.
<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:background="#color/colorBackground">
<!-- The main content view -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
layout="#layout/toolbar_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
<!-- The navigation drawer -->
<include
layout="#layout/nav_drawer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="start"/>
</android.support.v4.widget.DrawerLayout>
Navigation drawer layout:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
android:id="#+id/clDrawer"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorPrimary">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.design.widget.NavigationView
android:id="#+id/navView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:menu="#menu/menu_drawer_view"
app:headerLayout="#layout/anav_header"
android:background="#color/colorPrimary2"
app:itemIconTint="#color/colorIcon"
app:itemTextColor="#color/colorIcon"/>
</LinearLayout>
<android.support.design.widget.FloatingActionButton
android:id="#+id/navFAB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/activity_horizontal_margin"
android:clickable="true"
android:src="#drawable/plus_icon"
app:backgroundTint="#color/colorIcon"
app:layout_anchor="#id/headerLayout"
app:layout_anchorGravity="bottom|right|end" />
</android.support.design.widget.CoordinatorLayout>
And my anav_header for navigation view contains only the few text view.
I need fab to be anchored to the botom of the header, right between header and main content of ND.
The problem is layout_anchor works only if header and nav view are in the same layout. if i use navigationview property headerLayout , layout_anchor doesnt work. Also if i use NavigationView.addHeaderView(), it doesnt work too.
If i include header in navigation view layout by that way
<include
layout="#layout/anav_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
it works, BUT header and navigation view move like different parts. And i need them to act like one navigation drawer.
I need navigation drawer to lookes smth like that.

I have found my way.
First i've removed NavigationView and replaced it with drawer_header.xml with is simple LinearLayout with header image, and with drawer_list just after it with is a LinearLayout too with static menu items.
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorPrimary2">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:background="#color/colorPrimary2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!-- <android.support.design.widget.NavigationView
android:id="#+id/navView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/colorPrimary2"
app:headerLayout="#layout/drawer_header"
app:itemIconTint="#color/colorIcon"
app:itemTextColor="#color/colorIcon"
app:menu="#menu/menu_drawer_view" />-->
<include
layout="#layout/drawer_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="#dimen/activity_horizontal_margin"/>
<include
layout="#layout/layout_drawer_list"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</ScrollView>
<android.support.design.widget.FloatingActionButton
android:id="#+id/navFAB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/activity_horizontal_margin"
android:clickable="true"
android:src="#drawable/plus_icon"
app:backgroundTint="#color/colorIcon"
app:layout_anchor="#id/headerLayout"
app:layout_anchorGravity="bottom|right|end" />
</android.support.design.widget.CoordinatorLayout>
So, i made header and menu as LinearLayout, otherwise they both have scrolled, but i need em to scroll together. To add elements in header or menu you can use addView(View v).

Navigation Drawer unables clicks on page (Android Studio)

So basicly we implemented a Navigation Drawer to our project yesterday and since we can't click on items on our page anymore, as if the drawer still overlays the page even when closed enabling us to click on anything on the page. Is there a way to enable clicking on the elements below this "closed" navigation drawer?
Here's a sniplet of one of our pages using the Navigation Drawer, we're unable to click the single switchbutton even when the drawer is closed.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.cocacola.fastgids.SettingsActivity">
<android.support.v7.widget.Toolbar
android:id="#+id/my_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:elevation="4dp"
android:theme="#style/ThemeOverlay.AppCompat.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"/>
<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"
android:elevation="4dp"
>
<android.support.design.widget.NavigationView android:id="#+id/nav_view"
android:layout_width="wrap_content" android:layout_height="match_parent"
android:layout_gravity="start" android:fitsSystemWindows="true"
app:headerLayout="#layout/nav_header_main" app:menu="#menu/activity_main_drawer" />
</android.support.v4.widget.DrawerLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/setting_Bootanim"
android:id="#+id/textView2"
android:layout_marginLeft="22dp"
android:layout_marginStart="22dp"
android:layout_below="#+id/my_toolbar"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="28dp" />
<Switch
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/switchAnimation"
android:checked="true"
android:text="Disable/Enable"
android:layout_below="#+id/textView2"
android:layout_alignParentLeft="true"
android:layout_marginLeft="21dp" />
</RelativeLayout>

The first element in your layout when you want to use a navigation drawer, should always be a drawerlayout. Taken from the official Android developer site:
To add a navigation drawer, declare your user interface with a
DrawerLayout object as the root view of your layout.
I would highly suggest that you read this from the official android site, and redo your code.

don't add new View in DrawerLayout, it could intercept touch event.