Develop Reference

Unable to see any icons at the Bottom Navigation bar

I have been trying to display the icon images on my bottom navigation bar. No matter what I try I still can't get it. I have been trying so many different ways to solve but to no avail. Could someone please help me on this? Maybe I have missed out on something.
<?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"
android:background="#color/yellow"
tools:context=".MainActivity">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:id="#+id/fragment_layout">
</FrameLayout>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottomNavView"
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_gravity="bottom"
android:background="#color/white"
app:menu="#menu/menu">
</com.google.android.material.bottomnavigation.BottomNavigationView>
</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/nav_donate"
android:icon="#drawable/donate_icon"
android:title="Donate"/>
<item
android:id="#+id/nav_status"
android:icon="#drawable/status_icon"
android:title="Status"/>
<item
android:id="#+id/nav_history"
android:icon="#drawable/history_icon"
android:title="History"/>
<item
android:id="#+id/nav_logout"
android:icon="#drawable/logout_icon"
android:title="Log Out"/>
</menu>
```
The image link below is how the display is as of now.
[1]: https://i.stack.imgur.com/EH6AQ.png

Your layout height is set to 0dp
android:layout_height="0dp" where it is matching the constraints it is given. I have not seen your display but I'm guessing the frame layout is hiding your bottomNavView.
Change it to
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:id="#+id/fragment_layout"
app:layout_constraintTop_toTopOf="parent">
app:layout_constraintBottom_toTopOf="#id/bottomNavView">
</FrameLayout>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottomNavView"
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_gravity="bottom"
android:background="#color/white"
app:layout_constraintBottom_toBottomOf="parent">
app:menu="#menu/menu"/>
EDIT
With help from #Niaj Mahmud .
Change the material version in your app level build.gradle files from 1.5.0 to 1.3.0

yes in physical device it's work properly but in preview it does not show. this issue is for material version 1.5.0 .. try material 1.3.0 version
live view of bottom navigation in design view is not showing icons and the menu resource

Is there any way to see the Custom Layout applied to the Action Bar in the Android Studio Layout Editor?

Assuming you did not modify any properties in style.xml, the Layout Editor in Android Studio displays the Action Bar as:
By adjusting the style of the action bar, I can do things like adjust the background color of it.
However, the ActionBar I use is a Toolbar that uses a custom layout that can not be expressed simply by adjusting the properties of the action bar, as shown below.
It is not difficult to apply the above layout to the Action Bar during runtime. (change custom view, or apply AppTheme to NoActionBar, then set SupportActionBar)
What I really want is that the AppBar with these custom layouts will print out all of the xml inside the project I'm working on, but I have not found the right answer for it so far.
Is this an operation not supported by the Android studio?

You can achieve this via ToolBar & FrameLayouts,
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/coordinator_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="?actionBarSize">
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?attr/colorPrimary"
app:contentInsetStart="0dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
//TextView
//ImageView
// etc
</LinearLayout>
</android.support.v7.widget.Toolbar>
</FrameLayout>
<FrameLayout
android:id="#+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="?actionBarSize">
</FrameLayout>
Organize your host activity layout as above and load fragments inside the main_container

How to set full width for bottom navigation in Android

I am working in an Android app,In this I want to make set full width for bottom navigation tabs when I rotate the screen to landscape mode.
activit_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:id="#+id/Conslayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="0dp"
android:layout_marginStart="0dp"
android:animateLayoutChanges="true"
android:layoutMode="opticalBounds"
android:background="?android:attr/windowBackground"
app:itemBackground="?android:attr/windowBackground"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="#menu/navigation"
app:itemIconTint="#color/color_selector"
app:itemTextColor="#color/color_selector" />
</android.support.constraint.ConstraintLayout>
In this view I want to set the bottom navigation tabs to take full with like the Tab layout in the screen.
Thanks.

I have a BottomNavigationView that fits the whole screen in landscape mode, I believe the key is to set android:background and app:itemBackground to the same color.
Here is my BottomNavigationView that fits the whole screen in landscape mode:
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottom_navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#color/colorBottomBar"
app:itemBackground="#color/colorBottomBar"
app:itemIconTint="#drawable/bottom_navigation_toolbar"
app:itemTextColor="#drawable/bottom_navigation_toolbar"
app:menu="#menu/bottom_bar"/>
EDIT:
I misunderstood your question, so basically you want to stretch your buttons, I copied your layout exactly, and in the folderres in the subfolder values I created a file named dimens.xml, inside this file put this:
<resources xmlns:tools="http://schemas.android.com/tools">
<dimen name="design_bottom_navigation_item_max_width" tools:override="true">600dp</dimen>
<dimen name="design_bottom_navigation_active_item_max_width" tools:override="true">600dp</dimen>
</resources>
And just run your project again, the buttons will stretch. This is a quick solution, make sure that you check out this answer, because you need to take care of other screen sizes, the answer in this link gives a full and detailed solution.

Try this it works for me in mobile as well as tab. Just set your own colors.
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottomNavigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:animateLayoutChanges="true"
android:background="#color/light_blue_500"
android:layoutMode="opticalBounds"
android:theme="#style/BottomNavAppTheme"
app:itemBackground="#color/light_blue_500"
app:itemIconTint="#drawable/nav_item_color_state"
app:itemTextColor="#drawable/nav_item_color_state"
app:menu="#menu/bottom_navigation_main" />
This is my nav_item_color_state.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="#color/white" android:state_enabled="true" />
<item android:color="#color/colorPrimaryDark" android:state_enabled="false" />
</selector>

Need to set your width to
"match_parent"

Content goes behind soft navigation bar for api 21 and up

Have upgraded app to use Material Design - Theme.AppCompat.Light.NoActionBar, Toolbar instead of ActionBar etc..
And have a problem.
Bottom content become to be hidden under soft NavigationBar (see picture below) on devices with APi >= 21
Have found solution to fix this:
in values-v21/styles.xml
<style name="MyTheme" parent="Theme.AppCompat.Light.NoActionBar">
...
<item name="colorPrimaryDark">#color/green</item>
<item name="android:windowDrawsSystemBarBackgrounds">false</item>
</styles>
if option <item name="android:windowDrawsSystemBarBackgrounds">false</item> - bottom content is visible, but statusbar become completely black. I cant change color to colorPrimaryDark (green in my case)
if option <item name="android:windowDrawsSystemBarBackgrounds">true</item> - bottom content is invisible, and statusbar is green, as expected.
I want to have statusbar colored(green) and visible bottom content..
Probably, issue is with toolbar. Is it pushes content down?
Any suggestions?
<item name="android:windowDrawsSystemBarBackgrounds">true</item>
<item name="android:windowDrawsSystemBarBackgrounds">false</item>
UPDATE:
As suggested #azizbekian, I've replaced container for fragmets to CoordinatorLayout(before FrameLayout) and applied android:fitsSystemWindows="true"
In this case bottom panel is visible, but not at the bottom..
Goal is to keep buttons athe bottom...
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical">
<include
layout="#layout/toolbar"/>
<!-- The main content view -->
<android.support.design.widget.CoordinatorLayout
android:id="#+id/content"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
layout of the screen:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android">
<FocusableScrollView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="#+id/order_editor_layout"
android:fillViewport="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<include
android:layout_width="match_parent"
android:layout_height="match_parent"
layout="#layout/o_e_content"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"/>
</RelativeLayout>
</FocusableScrollView>
<include
android:layout_width="match_parent"
android:layout_height="wrap_content"
layout="#layout/oe_bottom_pane"/>
</LinearLayout>
Here is result:
UPDATE#2
Activity Layout:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
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/ActionBarTheme"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
<!-- The main content view -->
<FrameLayout
android:id="#+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</android.support.design.widget.CoordinatorLayout>
Replaced LinearLayour with CoordinatorLayout as root for activity.
As root element for content I've keep FrameLayout.
Applied android:fitsSystemWindows="true" to CoordinatorLayout.
This way, all content was slightly moved up and part of placed below the toolbar(you can see on image below - top elements are circle with + and - symbold. But on previous images there are text on the top.) Regarding bottom elements (buttons panel) - still placed below navigation bar but also slightly moved up. I've marked android:background="#color/red" to easier recognize position of this panel.
Seems, we are on the right way. All we need - to resolve problem - why content moved below the toolbar.. If tolbar will be top ui elemnt, buttons will be visible..

Apply android:fitsSystemWindows="true" to your root view.
See this post for detailed explanation.

Why doesn't the Graphical Layout view change when I update the background color of my ActionBar?

So I've changed the background of my Action Bar in a styles.xml file in my project. I thought that I was doing everything wrong because nothing was changing in the graphical layout, but when I uploaded it to my phone and ran it, the colors were fine.
I tried right clicking>open with> android layout editor, but the color of the Action Bar remains grey.
How can I update the preview in the 'Graphical Layout' tab of my activity_main.xml?
For reference: my styles.xml is:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="Theme.ActionBar.Background" parent="#android:style/Theme.Holo.Light">
<item name="android:actionBarStyle">#style/ActionBar.Solid.StockGetter</item>
</style>
<style name="ActionBar.Solid.StockGetter" parent="#android:style/Widget.Holo.Light.ActionBar.Solid">
<item name="android:background">#color/OrangePeel</item>
</style>
And the activity_main.xml is:
<LinearLayout 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"
android:orientation="horizontal"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<EditText
android:id="#+id/enterStockSymbolEditText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="3"
android:hint="#string/enter_stock_symbol"
android:inputType="text"
android:maxLength="10"
android:scrollHorizontally="true" />
<Button
android:id="#+id/enterStockSymbolButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/enterStockSymbolButton" />
</LinearLayout>
Thanks in advance!

In the Graphical Layout view of Eclipse, there is a drop down selection box at the top of the tab which has a blue/grey star next to with the name of the currently applied theme name. Make sure you have the correct theme selected for your preview.