Develop Reference

Prominent app bar with image appears behind status bar

I am using a prominent app bar with an image in a fragment.
My style and xml files look like this:
theme.xml:
<resources xmlns:tools="http://schemas.android.com/tools">
<!-- Base application theme. -->
<style name="Theme.MainTheme" parent="Theme.MaterialComponents.DayNight.NoActionBar">
<!-- Primary brand color. -->
<item name="colorPrimary">#color/DeepSkyBlue</item>
<item name="colorPrimaryVariant">#color/DeepSkyBlueVariant</item>
<item name="colorOnPrimary">#color/white</item>
<!-- Secondary brand color. -->
<item name="colorSecondary">#color/teal_200</item>
<item name="colorSecondaryVariant">#color/teal_700</item>
<item name="colorOnSecondary">#color/purple_500</item>
<!-- Status bar color. -->
<item name="android:statusBarColor">#android:color/transparent</item>
</style>
</resources>
main_activity.xml (which opens automatically the fragment):
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<androidx.fragment.app.FragmentContainerView
android:id="#+id/fragment_container_view_tag"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.example.tempapp.pkgFragments.PersonAddFragment" />
</androidx.constraintlayout.widget.ConstraintLayout>
fragment_add_person.xml (which uses a layout to prevent redudancy):
<androidx.coordinatorlayout.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"
>
<include
android:id="#+id/layoutAppBar"
layout="#layout/layout_app_bar_prominent" />
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
last but not least, my layout_app_bar_prominent.xml:
<?xml version="1.0" encoding="utf-8"?>
<!-- Layout tag not necessary, as we don't use any binding....-->
<com.google.android.material.appbar.AppBarLayout android:id="#+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="#dimen/app_bar_height_image_view"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<!--- contentScrim defines what should "appear" when the bar is not collapsed.
if not set in this case, the image will remain when bar is not collapsed-->
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:contentScrim="?attr/colorPrimary"
app:collapsedTitleTextColor="?attr/colorOnPrimary"
app:expandedTitleTextColor="?attr/colorOnPrimary"
>
<ImageView
android:id="#+id/expandedImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.7"
android:contentDescription="#string/app_bar_expanded_image"
/>
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:navigationIcon="?attr/homeAsUpIndicator"
>
</com.google.android.material.appbar.MaterialToolbar>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
So here is my situation:
My aim is that the toolbar image (expandedImage) should appear in the statusbar also.
After researching, some suggested adding the following code in my activity in order to accomplish this:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(
WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS
);
}
This works perfect and my image appears in my status bar:
HOWEVER, the issue I am having now, is that (when i collapse my toolbar), the title and menu icons appear behind the status bar due to the code I add above:
So there is basically no margin between the statusbar and my toolbar, which by default always exists.
If I remove the flag option, I don't have that issue anymore but then the image wouldn't appear in the status bar.
Any ideas how I could solve my issue? I've tried many solutions like:
<item name="android:windowDrawsSystemBarBackgrounds">true</item>
<item name="android:windowTranslucentStatus">true</item>
android:fitsSystemWindows="true"
but none of the situations worked for me...

Using CoordinatorLayout instead of ConstraintLayout for your activity will probably solve your problem.
NOTE: android:fitsSystemWindows=true is (in every subview) necessary, otherwise the app bar will never "fill" the status bar or you will experience some unexpected behaviour.
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
>
<androidx.fragment.app.FragmentContainerView
android:id="#+id/fragment_container_view_tag"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"´
android:name="com.example.tempapp.pkgFragments.PersonAddFragment" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>

Why doesn't the Bottom Navigation Menu appear in Android Studio

I am trying to add a bottom navigation menu for the application i am trying to make, I followed every step of the video and the bottom nav menu still not showing up. Can someone help me?
Dashboard xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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="Dashboard.Dashboard">
<androidx.fragment.app.FragmentContainerView
android:id="#+id/fragmentContainerView"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="0dp"
app:defaultNavHost="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="#navigation/bottom_nav" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottom_nav_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:menu="#menu/bottom_nav_menu"/>
</androidx.constraintlayout.widget.ConstraintLayout>
Bottom_Nav_Menu xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="#+id/feedFragment"
android:title="#string/home"
android:icon="#drawable/home_icon"/>
<item
android:id="#+id/searchFragment"
android:title="#string/search"
android:icon="#drawable/search_icon"/>
<item
android:id="#+id/postFragment"
android:title="#string/add"
android:icon="#drawable/add_post"/>
<item
android:id="#+id/notificationFragment"
android:title="#string/notification"
android:icon="#drawable/notification_icon"/>
<item
android:id="#+id/profileFragment"
android:title="#string/profile"
android:icon="#drawable/person_icon"/>
</menu>

never mind, I got it work somehow. Everything was working perfectly. I just needed to add a library before I use the bottom navigation bar.
This library in your build.grandle
implementation 'androidx.navigation:navigation-fragment:2.4.1'
implementation 'androidx.navigation:navigation-ui:2.4.1'

BottomNavigationView stuck at top

I've been trying to get a BottonNavigationView working. It just keeps sticking to the top of the layout and it's driving me nuts.
I've looked at Material Design Documentation for BottomNavigationView and it seems really simple, but I can't get it to work, https://material.io/develop/android/components/bottom-navigation/. I even tried making a completely clean project where I tried it and the same thing happened.
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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="wrap_content"
android:orientation="vertical"
tools:context=".MainActivity"
android:id="#+id/mainLayout">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottomNavigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="start"
app:menu="#menu/bottom_bar_menu" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="#+id/content"
android:enabled="true"
android:icon="#drawable/ic_menu_black_24dp"
android:title="Content"/>
<item
android:id="#+id/document"
android:enabled="true"
android:icon="#drawable/ic_picture_as_pdf_black_24dp"
android:title="Document"/>
<item
android:id="#+id/search"
android:enabled="true"
android:icon="#drawable/ic_search_black_24dp"
android:title="Search"/>
</menu>
Screenshot
Any ideas?

The gravity of your bottom navigation is set to start android:layout_gravity="start" changing it to android:layout_gravity="bottom" should work for you.

I would like to recommend to use ConstraintLayout and set constraints in Designer tool. Will be easier if you are new in android world.
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/mainLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottomNavigation"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:menu="#menu/bottom_bar_menu" />
</androidx.constraintlayout.widget.ConstraintLayout>

Navigation Drawer items not showing anything [duplicate]

This question already has answers here:
NavigationView OnNavigationItemSelectedListener not being called
(3 answers)
Navigation Drawer closes on click
(1 answer)
Android studio 3.5 refactor issue
(9 answers)
Closed 3 years ago.
I have updated the Android Studio to version 3.5 from August 9 2019. I have tried to get familiar with new idea for navigation drawer using Navigation Component. I created the new project and chose the Navigation Drawer Activity at start. After that, I have tried to run the app to see if everything works fine but the drawer menu doesn't work. The drawer gets open but when I click on any available items it just close the drawer not opening proper fragment. I have also tried to set different fragment as a Start Destination and it works fine, the correct fragment gets open at start correctly however the drawer menu still doesn't work.
What am I missing? How can I make it work?
Code comes straight from the fresh new Navigation Drawer Activity:
activity_main:
<?xml version="1.0" encoding="utf-8"?>
<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:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<com.google.android.material.navigation.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" />
<include
layout="#layout/app_bar_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.drawerlayout.widget.DrawerLayout>
app_bar_main:
<androidx.coordinatorlayout.widget.CoordinatorLayout 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">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/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>
<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="#android:drawable/ic_dialog_email" />
<include layout="#layout/content_main" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
content_main:
<androidx.constraintlayout.widget.ConstraintLayout 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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/app_bar_main">
<fragment
android:id="#+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="#navigation/mobile_navigation" />
</androidx.constraintlayout.widget.ConstraintLayout>
activity_main_drawer:
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:showIn="navigation_view">
<group android:checkableBehavior="single">
<item
android:id="#+id/nav_home"
android:icon="#drawable/ic_menu_camera"
android:title="#string/menu_home" />
<item
android:id="#+id/nav_gallery"
android:icon="#drawable/ic_menu_gallery"
android:title="#string/menu_gallery" />
<item
android:id="#+id/nav_slideshow"
android:icon="#drawable/ic_menu_slideshow"
android:title="#string/menu_slideshow" />
<item
android:id="#+id/nav_tools"
android:icon="#drawable/ic_menu_manage"
android:title="#string/menu_tools" />
</group>
<item android:title="Communicate">
<menu>
<item
android:id="#+id/nav_share"
android:icon="#drawable/ic_menu_share"
android:title="#string/menu_share" />
<item
android:id="#+id/nav_send"
android:icon="#drawable/ic_menu_send"
android:title="#string/menu_send" />
</menu>
</item>
</menu>
mobile_navigation:
<navigation 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/mobile_navigation"
app:startDestination="#+id/nav_home">
<fragment
android:id="#+id/nav_home"
android:name="com.broadenup.test.ui.home.HomeFragment"
android:label="#string/menu_home"
tools:layout="#layout/fragment_home" />
<fragment
android:id="#+id/nav_gallery"
android:name="com.broadenup.test.ui.gallery.GalleryFragment"
android:label="#string/menu_gallery"
tools:layout="#layout/fragment_gallery" />
<fragment
android:id="#+id/nav_slideshow"
android:name="com.broadenup.test.ui.slideshow.SlideshowFragment"
android:label="#string/menu_slideshow"
tools:layout="#layout/fragment_slideshow" />
<fragment
android:id="#+id/nav_tools"
android:name="com.broadenup.test.ui.tools.ToolsFragment"
android:label="#string/menu_tools"
tools:layout="#layout/fragment_tools" />
<fragment
android:id="#+id/nav_share"
android:name="com.broadenup.test.ui.share.ShareFragment"
android:label="#string/menu_share"
tools:layout="#layout/fragment_share" />
<fragment
android:id="#+id/nav_send"
android:name="com.broadenup.test.ui.send.SendFragment"
android:label="#string/menu_send"
tools:layout="#layout/fragment_send" />
</navigation>

Persistent Bottom Sheet with rounded corners in Android crashes when used in a card view

I have created a persistent bottom sheet in android with the intent of displaying a ListView containing additional information about locations. I want the sheet to have rounded corners. I got a ton of results for modal dialog but none for persistent. Is it possible or should I use the modal version?
As suggested in an answer here, I tried wrapping it in a card view but the app crashes when I try to open the fragment.
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
tools:context=".fragments.MapFragment">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
app:cardCornerRadius="20dp">
<fragment
android:id="#+id/autocomplete_fragment"
android:name="com.google.android.libraries.places.widget.AutocompleteSupportFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:layout="#layout/places_autocomplete_item_powered_by_google" />
</androidx.cardview.widget.CardView>
<com.google.android.gms.maps.MapView
android:id="#+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="450dp"
app:cardCornerRadius="24dp"
app:cardElevation="8dp"
app:layout_behavior="#string/bottom_sheet_behavior"
app:behavior_hideable="true"
app:behavior_peekHeight="55dp">
<androidx.core.widget.NestedScrollView
android:id="#+id/bottom_sheet"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/tvBottomSheet"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/placeholder_text"
android:textColor="#color/colorCommon_BLACK"
android:textSize="37sp" />
</androidx.core.widget.NestedScrollView>
</androidx.cardview.widget.CardView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>

With the new Material Component library you can customize the shape of your component using the shapeAppearanceOverlay attribute.
You can use something like:
<!-- BottomSheet -->
<style name="CustomBottomSheet" parent="Widget.MaterialComponents.BottomSheet">
<item name="shapeAppearanceOverlay">#style/CustomShapeAppearanceOverlay.MaterialComponents.BottomSheet</item>
....
</style>
<style name="CustomShapeAppearanceOverlay.MaterialComponents.BottomSheet" parent="">
<item name="cornerSizeTopRight">16dp</item>
<item name="cornerSizeTopLeft">16dp</item>
<item name="cornerSizeBottomRight">0dp</item>
<item name="cornerSizeBottomLeft">0dp</item>
</style>
Then you can apply this style to your single component or your theme app.
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.MaterialComponents.Light">
...
<item name="bottomSheetStyle">#style/CustomBottomSheet</item>
</style>
If you are using a non-modal bottom sheet just apply the style. For example:
<LinearLayout
android:id="#+id/standardBottomSheet"
app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior"
style="?attr/bottomSheetStyle"
...>

U can add shape for you bottom sheet background background
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#color/you_color"/>
<corners
android:bottomRightRadius="2dp"
android:bottomLeftRadius="2dp"
android:topLeftRadius="2dp"
android:topRightRadius="2dp"/>
</shape>

You could also use the app:shapeAppearance attribute:
Create a ShapeAppearance in styles.xml:
<resources>
...
<style name="BottomSheetShapeAppearance">
<item name="cornerFamily">rounded</item>
<item name="cornerSizeTopLeft">16dp</item>
<item name="cornerSizeTopRight">16dp</item>
</style>
</resources>
Set the app:shapeAppearance attribute on the BottomSheet component:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
style="#style/Widget.MaterialComponents.BottomSheet"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior"
app:shapeAppearance="#style/BottomSheetShapeAppearance">
...
</LinearLayout>
Here's how it looks:
More info: https://material.io/develop/android/theming/shape

You can wrap your sheet layout with a card view to have rounded corners.
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
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">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="450dp"
app:layout_behavior="#string/bottom_sheet_behavior"
app:cardCornerRadius="24dp"
app:cardElevation="8dp"
app:behavior_hideable="true"
app:behavior_peekHeight="55dp">
<androidx.core.widget.NestedScrollView
android:id="#+id/bottom_sheet"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/tvBottomSheet"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="ABC"
android:textSize="37sp" />
</androidx.core.widget.NestedScrollView>
</androidx.cardview.widget.CardView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>