Develop Reference

Android navigation bar and status bar elevation/shadows

I would like to set my navigation bar and my status bar like in the example in the image in the link below.
How could I do that
see the example

you can do this simply by setting style attributes like this:
<resources xmlns:android="http://schemas.android.com/apk/res/android">
<style name="Theme" parent="android:Theme.Material.Wallpaper.NoTitleBar">
<item name="android:statusBarColor">set_your_color</item>
<item name="android:navigationBarColor">set_your_color</item>
<item name="android:windowTranslucentStatus">true</item>
<item name="android:windowTranslucentNavigation">true</item>
</style>
</resources>
Hope it will help you!!

If you want to remove elevation and shadow of toolbar add app:elevation="0dp" in toolbar like below:
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:elevation="0dp"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/custom_toolbar"
android:layout_width="match_parent"
android:elevation="0dp"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:popupTheme="#style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>

android:elevation applied to toolbar AND its title

I use a very simple style to format my Toolbar, I use android:elevation to display a shadow under the Toolbar like this:
<style
name="AppToolbarTheme"
parent="AppTheme">
<item name="android:background">#color/colorPrimary</item>
<item name="android:titleTextColor">#android:color/white</item>
<item name="android:elevation">4dip</item>
</style>
And I'm applying it simply like that:
<Toolbar
android:id="#+id/main_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppToolbarTheme"/>
The shadow displays under the toolbar like I want, howerver it is also somehow applied to the title of the toolbar which looks very weird:

Remove <item name="android:elevation">4dip</item> from style and put it in toolbar xml
<Toolbar
android:id="#+id/main_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppToolbarTheme"
android:elevation="4dp"/>

I was looking at this and helped me to identify my mistake, which I think it is the same as yours:
You are using style properties (Widget) in a theme. Theme are used to define global properties such as colorOnSurface, colorSurface, primaryColor, etc. Here you are using:
<item name="android:background">#color/colorPrimary</item>
<item name="android:titleTextColor">#android:color/white</item>
<item name="android:elevation">4dip</item>
which are specific to a toolbar.
I recommend to define a style like below (you can set whatever parent you want as long as it is Widget.whatever.Toolbar)
<style name="Widget.Toolbar" parent="Widget.MaterialComponents.Toolbar.Surface">
<item name="elevation">4dp</item>
</style>
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="#style/Widget.Toolbar"/>
What I am doing at the moment is using appbar, so you can apply elevation there instead:
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appbar"
android:theme="#style/Theme.AppBarTheme"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</com.google.android.material.appbar.AppBarLayout>
<style name="Theme.AppBarTheme">
<item name="elevation">6dp</item>
<item name="toolbarStyle">#style/Widget.Toolbar</item>
</style>
<style name="Widget.Toolbar" parent="Widget.MaterialComponents.Toolbar.Surface">
<item name="android:titleTextColor">#android:color/white</item>
</style>

You use
android:theme="#style/AppToolbarTheme"
in your toolbar and in that case it add elevation to nested components as well 'cause you define a theme.
Use
style="#style/AppToolbarTheme"
instead.

How to make colorPrimary not show as toolbar background

I am trying to make the toolbar background color transparent however, the colorPrimary theme seems to be showing instead. When I set the background of the toolbar to a standard color, it overrides colorPrimary and work as intended, but is there a way for me to get rid of it completely as to make the toolbar background transparent? The reason that I still want colorPrimary is because of the recent apps tab color, I just want it to not show in the toolbar. Thank you.
Toolbar
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#android:color/transparent" />
Style
<style name="AppTheme1" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#android:color/transparent</item>
<item name="colorAccent">#color/colorPrimary</item>
<item name="android:windowLightStatusBar">true</item>
<item name="android:windowContentOverlay">#null</item>
<item name="android:elevation">0dp</item>
<item name="elevation">0dp</item>
<item name="drawerArrowStyle">#style/DrawerArrowStyle</item>
<item name="android:textColorSecondary">#color/colorPrimary</item>
</style>

use the code instead of only toolbar
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="8dp"
android:background="#android:color/transparent"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#android:color/transparent"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>

use this
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
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/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#drawable/background_toolbar_translucent" />
background_toolbar_translucent.xml
<?xml version="1.0" encoding="utf-8"?>
<gradient
android:angle="270"
android:endColor="#android:color/transparent"
android:startColor="#color/black_alpha_40"/>
colors.xml
<color name="black_alpha_40">#66000000</color>

make toolbar.xml inside layout folder. Use below code:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
android:background="#android:color/transparent"
local:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
local:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
And use this toolbar in your activity's xml. This way you will have a transparent toolbar.

TabLayout highlite and Ripple effect

I have two question with TabLayout
1)Can i remove TabLayout highlight or change highlight color of tab layout?
2)Can i add ripple effect for tab. Each tab contain TextView i try to add custom background something like this
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="?android:colorControlHighlight">
<item android:drawable="#drawable/btn_white_bg" />
</ripple>
but it doesn't work.

To remove the highlight, add the below line to your XML:
app:tabRippleColor="#android:color/transparent"

Another solution that works for me
<android.support.design.widget.TabLayout
android:id="#+id/tab_layout"
android:minHeight="?attr/actionBarSize"
android:layout_width="match_parent"
app:tabMode="fixed"
app:tabGravity="fill"
android:clipToPadding="false"
android:elevation="0dp"
style="#style/MyCustomTabLayout"
android:background="#color/colorPrimary"
app:tabBackground="?attr/selectableItemBackground"
app:tabIndicatorColor="#color/app_yellow"
app:tabIndicatorHeight="4dip"
android:layout_height="wrap_content"/>
I just added following lines
android:background="#color/colorPrimary"
app:tabBackground="?attr/selectableItemBackground"

You can customize the TabLayout like this:
Make a xml file inside values MyCustomTabLayout.xml and then put these
<resources>
<style name="MyCustomTabLayout" parent="Widget.Design.TabLayout">
<item name="tabMaxWidth">#dimen/tab_max_width</item>
<item name="tabIndicatorColor">#color/black</item>
<!-- <item name="tabIndicatorColor">?attr/colorAccent</item> -->
<item name="tabIndicatorHeight">5dp</item>
<item name="tabPaddingStart">12dp</item>
<item name="tabPaddingEnd">12dp</item>
<item name="tabBackground">?attr/selectableItemBackground</item>
<item name="tabTextAppearance">#style/MyCustomTabTextAppearance</item>
<item name="tabSelectedTextColor">?android:textColorPrimary</item>
</style>
<style name="MyCustomTabTextAppearance" parent="TextAppearance.Design.Tab">
<item name="android:textSize">16sp</item>
<item name="android:textColor">?android:textColorSecondary</item>
<item name="textAllCaps">true</item>
</style>
and inside ur layout add this:
<android.support.design.widget.TabLayout
android:id="#+id/mainSlidingTab"
style="#style/MyCustomTabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/tool_bar"
android:background="#color/ColorPrimary" />
<!-- app:tabMode="scrollable" when many tabs -->

Alternatively, you can make the ripple transparent programmatically:
val tabs = findViewById<TabLayout>(R.id.your_tablayout)
for (n in 0 until tabs.tabCount) {
val tab = (tabs.getChildAt(0) as ViewGroup).getChildAt(n)
tab?.let {
val ripple = it.background as? RippleDrawable
ripple?.setColor(ColorStateList.valueOf(Color.parseColor("#00000000")))
}
}
This approach can also be used to set own ripple color for each tab.

Toolbar options menu background color

I am using the toolbar for android.
I just want to change the background color of the overflow menu. But it is not changing.
Style xml
<style name="MyDarkToolbarStyle" parent="Widget.AppCompat.Toolbar">
<item name="popupTheme">#style/PopupMenuStyle</item>
<item name="theme">#style/ThemeOverlay.AppCompat.Dark.ActionBar</item>
</style>
<style name="PopupMenuStyle" parent="android:Widget.Holo.Light.PopupMenu">
<item name="android:popupBackground">#android:color/white</item>
</style>
Toolbar XML
<android.support.v7.widget.Toolbar
android:id="#+id/tool_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/ColorPrimary"
android:elevation="2dp"
android:theme="#style/MyDarkToolbarStyle" />

To change the toolbar options menu color, add this to your toolbar element
app:popupTheme="#style/MyDarkToolbarStyle"
Then in your styles.xml define the popup menu style
<style name="MyDarkToolbarStyle" parent="ThemeOverlay.AppCompat.Light">
<item name="android:colorBackground">#color/mtrl_white_100</item>
<item name="android:textColor">#color/mtrl_light_blue_900</item>
</style>
Note that you need to use colorBackground not background. The latter would be applied to everything (the menu itself and each menu item), the former applies only to the popup menu.

Edit:
if you just want a white overflow popup menu just do this
<android.support.v7.widget.Toolbar
android:id="#+id/tool_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/ColorPrimary"
android:elevation="2dp"
app:theme="#style/MyDarkToolbarStyle"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"" />
and remove the redundant popupTheme your Style xml
<style name="MyDarkToolbarStyle" parent="Widget.AppCompat.Toolbar">
<item name="theme">#style/ThemeOverlay.AppCompat.Dark.ActionBar</item>
</style>
You should also include this in your top (parent) Layout
xmlns:app="http://schemas.android.com/apk/res-auto"

Simplest way
If you just want a white overflow popup menu just do this:
<android.support.v7.widget.Toolbar
android:id="#+id/tool_bar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/ColorPrimary"
android:elevation="2dp"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
Also, take a look at the value of android:layout_height attribute.