Develop Reference

How to add second line to text on bottom bar for Android?

I'm trying to have my text go down to a second line so it's not cut off but not sure whether this is possible using the Google MaterialBottomBar?
Something like the image below please.
But this is what I have:
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottomNav"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#color/white"
app:labelVisibilityMode="labeled"
app:itemIconTint="#drawable/nav_items_color"
app:itemTextColor="#drawable/nav_items_color"
app:menu="#menu/bottom_menu_nav" />
Thank you.

Add a style to BottomNavigation in style.xml
<style name="BottomNavigationStyle">
<item name="android:lines">2</item>
</style>
And then use above style in your xml
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottomNav"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#color/white"
app:labelVisibilityMode="labeled"
app:itemIconTint="#drawable/nav_items_color"
app:itemTextColor="#drawable/nav_items_color"
android:theme="#style/BottomNavigationStyle"
app:menu="#menu/bottom_menu_nav" />

This is just a hint to #chand mohd answer to have the text centered like that you would like to have.
So, besides android:lines, add the android:gravity attribute to have a centered text
<style name="BottomNavigationStyle">
<item name="android:gravity">center</item>
<item name="android:lines">2</item>
</style>

Custom Seekbar with on top value

I'm trying to make some Seekbar for my app as a distance value. I had liked it to looks something like this (image was taken from - link):
Can someone please show a simple example of how to make something like this?
I know that I can use "already made" Seekbars from Github but I'm trying to understand the concept so I can further design it.
Thank you

With the Material Components Library version 1.2.0 provided by Google you can use the Slider component.
Just add in your layout:
<LinearLayout
android:layout_height="wrap_content"
android:clipChildren="false"
android:clipToPadding="false"
...>
<com.google.android.material.slider.Slider
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
app:labelBehavior="withinBounds"
android:value="7"
android:valueFrom="0"
android:valueTo="10"
.../>
</LinearLayout>
You can customize the colors using these attrs:
<com.google.android.material.slider.Slider
app:activeTrackColor="#color/primaryDarkColor"
app:inactiveTrackColor="#color/primaryLightColor"
app:thumbColor="#color/primaryDarkColor"
.../>
or you can override the default colors using a custom style with the materialThemeOverlay attribute:
<com.google.android.material.slider.Slider
style="#style/Custom_Slider_Style"
with:
<style name="Custom_Slider_Style" parent="Widget.MaterialComponents.Slider">
<item name="materialThemeOverlay">#style/slider_overlay</item>
</style>
<style name="slider_overlay">
<item name="colorPrimary">#color/...</item>
<item name="colorOnPrimary">#color/...</item>
</style>
or use the android:theme attr in the layout:
<com.google.android.material.slider.Slider
android:theme="#style/slider_overlay"
../>
Example:
If you want to customize the tooltip shape you can use the labelStyle attribute:
<com.google.android.material.slider.Slider
app:labelStyle="#style/tooltip"
with:
<style name="tooltip" parent="Widget.MaterialComponents.Tooltip">
<item name="shapeAppearanceOverlay">#style/tooltipShOverylay</item>
<item name="backgroundTint">#color/....</item>
</style>
<style name="tooltipShOverylay">
<item name="cornerSize">50%</item>
</style>

Android FAB icon always black with MaterialComponents theme

I'm creating an Android app and I'm using the AndroidX libraries and Material design theme. My app theme on styles.xml is:
<style name="AppTheme" parent="Theme.MaterialComponents.Light.DarkActionBar">
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
I have the following FAB from a custom library:
<com.leinardi.android.speeddial.SpeedDialView
android:id="#+id/work_log_fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
app:layout_behavior="#string/speeddial_scrolling_view_snackbar_behavior"
app:sdMainFabClosedSrc="#drawable/ic_add_white_24dp"
app:sdOverlayLayout="#id/overlay" />
And also tried the default FAB:
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:src="#drawable/ic_add_white_24dp"
android:layout_margin="16dp" />
No mater the color of the icon (a vector drawable), the icon inside the FAB (from the library and from the default) is always black. I have narrowed down the problem to the material design theme, since using the old Theme.AppCompat.Light.DarkActionBar instead of the new Theme.MaterialComponents.Light.DarkActionBar the icon inside the FAB gets the color of the original vector drawable.
Does anyone know why this is happening and how to solve it?

I solved this by using:
app:tint="#color/COLOR_OF_ICON"
and NOT:
android:tint="#color/COLOR_OF_ICON"
Reference: https://github.com/material-components/material-components-android/blob/master/docs/components/FloatingActionButton.md

For MaterialComponents Theme you can define the following colors.
<style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
<item name="colorPrimary">#color/primary</item>
<item name="colorPrimaryDark">#color/primaryDark</item>
<item name="colorPrimaryVariant">#color/primaryVariant</item>
<item name="colorOnPrimary">#color/onPrimary</item>
<item name="colorSecondary">#color/secondary</item>
<item name="colorSecondaryVariant">#color/secondaryVariant</item>
<item name="colorOnSecondary">#color/onSecondary</item>
<item name="colorAccent">#color/accent</item>
<item name="colorSurface">#color/surface</item>
<item name="colorOnSurface">#color/onSurface</item>
<item name="colorError">#color/error</item>
<item name="colorOnError">#color/onError</item>
<item name="colorButtonNormal">#color/buttonNormal</item>
<item name="colorControlNormal">#color/controlNormal</item>
<item name="colorControlActivated">#color/controlActivated</item>
<item name="colorControlHighlight">#color/controlHighlight</item>
<item name="colorBackgroundFloating">#color/backgroundFloating</item>
</style>
colorSecondary is the responsible color for FloatingActionButton.
and
colorOnSecondary is the responsible color for icon color of FloatingActionButton.
In your AppTheme you have not defied the colorSecondary. So, it took the default black color from parent Theme.MaterialComponents.Light.DarkActionBar.
Reference : Android dev summit, 2018 - The Components of Material Design

As said in this answer, if your icon has multiple colors or if you want to keep your icon original color(s), then assign #null as the tint:
app:tint="#null"

According to the GitHub documentation page for the Material Components library's FloatingActionButton, the only attributes that affect the icon are
app:srcCompat
app:tint
app:maxImageSize
In this case, since your color is defined as a constant (#FFF), the only one that seems to make sense is app:tint. Perhaps something in your theme has set this to black?
You ought to be able to override it by setting app:tint="#FFF" on your FAB.

Is Your Icon is multicolor
Add Only
app:tint="#null"
but if you only want to change color
#dimen/fab_margin -> 16dp
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
style="#style/Widget.MaterialComponents.FloatingActionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
app:backgroundTint="#color/colorAccent"
app:srcCompat="#drawable/ic_add"
app:tint="#color/colorWhite" />
Style :
<style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
Programmatically in kotlin :
fab.setImageDrawable(ContextCompat.getDrawable(context!!, R.drawable.your_drawable))

In my case, I just follow this
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/bottom_home"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/ic_home"
android:scaleType="centerCrop"
android:src="#drawable/ic_add_sign"
app:backgroundTint="#color/app_dark_green"
app:borderWidth="0dp"
app:elevation="6dp"
app:fabSize="normal"
app:layout_anchor="#id/nav_view"
app:tint="#FFF" />
And my result is

use app:tint="#color/white"
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab_add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="16dp"
app:tint="#color/white"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:srcCompat="#drawable/ic_done"/>

I was looking for it and the following code worked.
android:backgroundTint="#color/primarycolor"
android:textColor="#color/white"
app:iconTint="#color/white"

Using vector asset as icon for FAB . Here is what worked for me .
app:tint is changing vector icon color and app:backgroundTint is changing background of FAB .
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/idFABAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:gravity="bottom"
android:layout_gravity="bottom|right"
android:layout_marginBottom="70dp"
android:layout_alignParentBottom="true"
android:layout_marginStart="18dp"
android:layout_marginTop="18dp"
android:layout_marginEnd="18dp"
app:srcCompat="#drawable/ic_baseline_home_24"
app:tint="#color/white"
app:backgroundTint="#color/purple_500"
android:contentDescription="TODO" />

I'm also using Heinardi speed dial library. According to the document about customizing items, you can define a theme for the component:
<style name="Theme.FAB">
<item name="colorPrimary">#color/Primary</item>
<item name="colorAccent">#color/Accent</item>
<item name="colorOnSecondary">#color/white</item>
</style>
Note that colorPrimary defines the color of extended buttons,
colorAccent the color of main button,
colorOnSecondary the color of icon.
Then you can add the theme to SpeedDialView:
<com.leinardi.android.speeddial.SpeedDialView
android:id="#+id/speedDial"
android:theme="#style/Theme.FAB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
app:sdMainFabClosedSrc="#drawable/ic_add_white"
app:sdOverlayLayout="#id/speedDialOverlay" />

app:backgroundTint="#color/white"
app:fabSize="mini"
app:srcCompat="#drawable/ic_"
app:tint="#null"

Color of icons are overrided by colorOnSecondary (see themes.xml).
To put the icon colour you want you must use:
app:tint="#colour/icon_colour"
And for the background:
app:backgroundTint="#colour/icon_colour"
You can change these colours automatically by the theme using https://stackoverflow.com/a/24043959/1200914

Just want to add my 2 cents. There are a few options how to fix your color issue for Material Components. The majority of them are already covered in the answers.
However, there's another and, probably, more general approach in this case. You can set a default "floatingActionButtonStyle" to your theme which will be used for all FloatingActionButtons.
<style name="Theme.Design" parent="Theme.MaterialComponents.Light.NoActionBar">
<item name="floatingActionButtonStyle">#style/Theme.Design.FloatingActionButton</item>
</style>
<style name="Theme.Design.FloatingActionButton" parent="Widget.MaterialComponents.FloatingActionButton">
<item name="tint">#null</item>
</style>
More details about styling of FloatingActionButtons is available there Theming Fabs

UPDATED
Shortly:
#gab-ledesma comment did the trick:
https://stackoverflow.com/a/53843325/5451349
implementation 'com.google.android.material:material:1.2.0-alpha05'
<com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
...
app:iconTint="#color/white"
app:icon="#drawable/ic_add_white"
...
Finnaly app:iconTint changed an icon color.
I've found it in the source code:
https://github.com/material-components/material-components-android/blob/master/lib/java/com/google/android/material/floatingactionbutton/res/values/styles.xml#L81
Of cource, you need to check the instruction before:
https://github.com/material-components/material-components-android/blob/master/docs/getting-started.md

When using Theme.MaterialComponents.Light.NoActionBar style, setting Button Background has no effect

In order to use Chip and ChipGroup, I set Application style extends Theme.MaterialComponents.Light.NoActionBar int manifests.xml, then I set Button "android:background" attr, but it does not effect! why? and what can I do?
This is my style:
<style name="AppBaseTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
<item name="colorPrimary">#color/primary_material_light</item>
<item name="colorPrimaryDark">#color/header_color</item>
<item name="actionBarSize">48dp</item>
<item name="android:screenOrientation">portrait</item>
<!--<item name="buttonStyle">#style/AntButton</item>-->
<!--<item name="materialButtonStyle">#style/AntButton</item>-->
<!--<item name="android:button"></item>-->
<!--<item name="android:progressTint">#color/ffc000</item>-->
<item name="colorAccent">#color/ffc000</item>
</style>
<style name="AntButton" parent="android:Widget">
<item name="android:background">#drawable/abc_btn_default_mtrl_shape</item>
<item name="android:textAppearance">?android:attr/textAppearanceButton</item>
<item name="android:minHeight">48dip</item>
<item name="android:minWidth">88dip</item>
<item name="android:focusable">true</item>
<item name="android:clickable">true</item>
<item name="android:gravity">center_vertical|center_horizontal</item>
<!--<item name="android:colorButtonNormal">#color/white</item>-->
</style>
I have tried to change buttonStyle and materialButtonStyle, but not effect too!
this is my layout XML:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/ll_popup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#color/white"
android:divider="#drawable/shape_divider_05dp"
android:orientation="vertical"
android:showDividers="beginning|middle">
<!--only can use backgroundTint to change background color-->
<Button
android:id="#+id/item_popupwindows_Photo"
android:layout_width="match_parent"
android:layout_height="55dp"
android:backgroundTint="#color/white"
android:text="Pictrue"
android:textColor="#color/c_666666"
android:textSize="16sp" />
<!--background not effect !!-->
<Button
android:id="#+id/item_popupwindows_cancel"
android:layout_width="match_parent"
android:layout_height="55dp"
android:background="#color/white"
android:text="cancel"
android:textColor="#color/c_666666"
android:textSize="16sp" />
</LinearLayout>
</LinearLayout>
this is result :
Because I have used Chip and ChipGroup in APP, I have to user theme extends MaterialComponents! do you know how to resolve it ？please tell me, thanks!
in this page Can't use android:background with button from the new material components, the author wants to change the default padding, but I want to change the backgroundDrawable, so, it does not work for me.

If you want a true Button, but one that you can modify like the framework Button (instead of the MaterialButton), then you can explicitly specify the framework version in your layout file. Replace this:
<Button
android:id="#+id/item_popupwindows_cancel"
... />
with this:
<android.widget.Button
android:id="#+id/item_popupwindows_cancel"
... />
This will give you what it says on the tin: an android.widget.Button, which should respond to styling the way you expect.
Similarly, you could use a <androidx.appcompat.widget.AppCompatButton> if you want support library features but not material components features.

In this particular case, the LinearLayout holding your second Button seems to have a white background color. That means you don't need to explicitly specify a white background for your Button; you can just let the LinearLayout's background show through.
This can be accomplished by using the "Text Button" style of MaterialButton:
style="#style/Widget.MaterialComponents.Button.TextButton"

Use this code for change the color
app:backgroundTint="#color/primaryColor"

You can also use ImageButton instead of Button from material components. android:background is working on ImageButton.
<ImageButton
android:id="#+id/item_popupwindows_cancel"
... />

Android - CardView elevation shadow make darker

I am using 'com.android.support:cardview-v7:23.4.0' and I see the shadow but is not a dark grey shadow, and I would like to get a darker elevation shadow, but I do not see any attribute to get it, any ideas?
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginRight="8dp"
android:layout_marginLeft="8dp"
android:layout_marginBottom="8dp"
app:cardElevation="8dp"
app:cardPreventCornerOverlap="false"
app:cardCornerRadius="1dp"
app:cardUseCompatPadding="false">
<include layout="#layout/any_layout"/>
</android.support.v7.widget.CardView>

I believe that the shadow intensity is defined by the underlying theme that the app uses. So for API level more than 21, you can override the intensity of shadows. In your styles.xml add these two extra lines of ambientShadowAlpha and spotShadowAlpha. Please note that these values range from 0 to 1, with 0 being completely transparent and 1 being completely opaque(almost black) :
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.MaterialComponents.DayNight.NoActionBar">
<!-- Customize your theme here. -->
<item name="android:fontFamily">#font/barlow_family</item>
<item name="android:ambientShadowAlpha">1</item>
<item name="android:spotShadowAlpha">1</item>
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
<item name="android:statusBarColor">#android:color/background_light</item>
</style>

<androidx.cardview.widget.CardView app:cardCornerRadius="10dp"
app:cardUseCompatPadding="true"
android:elevation="10dp"
android:outlineSpotShadowColor="#color/black"
android:outlineAmbientShadowColor="#color/grey"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
app:cardUseCompatPadding="true"
try this

You can't change cardView shadow color but to make it darker you can use app:cardElevation="15dp" like
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_margin="10dp"
app:cardElevation="15dp"
> </android.support.v7.widget.CardView>

there is no way to change color of official CardView elevation, look at this Carbon

Try using this solution. Wrap your cardview in a RelativeLayout and give a background to it.
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="150dp"
android:background="#FFE7E2E4">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:cardElevation="5dp"
app:cardUseCompatPadding="true"/>
</RelativeLayout>