Develop Reference

Android slider theme secondary color is not changed why?

I have a range slider as below:
<com.google.android.material.slider.RangeSlider
android:id="#+id/priceSlider"
android:layout_width="match_parent"
android:layout_height="5dp"
android:theme="#style/Myslider"
android:valueFrom="0.0"
android:valueTo="100.0"
android:visibility="visible"
app:thumbColor="#color/themecolor2"
app:thumbRadius="8dp"
app:values="#array/initial_slider_values" />
This slider has a style as below:
<style name="Myslider" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
<item name="colorPrimary">#c0c0c0</item>
<item name="colorPrimaryVariant">#color/purple_700</item>
<item name="colorOnPrimary">#color/white</item>
<!-- Secondary brand color. -->
<item name="colorSecondary">#color/purple_700</item>
<item name="colorSecondaryVariant">#color/purple_700</item>
<item name="colorOnSecondary">#color/purple_700</item>
</style>
The slider takes the line color as primary color (colorPrimay), but the line between the 2 thumbs of the slider is not the colorSecondary specified in the style, it is the colorPrimary but darker,
why doesn't the slider take the secondary color from the style ?

You cannot control the two lines on your graphic separately.
But with ThemeOverlay.Slider it is possible to change the color [for both(!)] without changing the whole app:theme color like colorPrimary.
Therefore add this snippet of code to your styles.xml:
<style name="Rslider" parent="#style/Widget.MaterialComponents.Slider">
<item name="materialThemeOverlay">#style/ThemeOverlay.Slider</item>
</style>
<style name="ThemeOverlay.Slider" parent="">
<!-- change the line color -->
<item name="colorPrimary">#304FFE</item>
</style>
And finally apply the #style to your layout that contains the RangeSlider:
<com.google.android.material.slider.RangeSlider
android:id="#+id/priceSlider"
android:layout_width="match_parent"
android:layout_height="5dp"
android:theme="#style/Rslider"
android:valueFrom="0.0"
android:valueTo="100.0"/>
...
Wish I had better news, but MaterialDesign decided to clue both of the line types together with a fixed relation between each other in terms of color coding.

My UI doesn't work anymore after applying Material Design

I started learning Material Design with this video: https://www.youtube.com/watch?v=0hR2skWlb_U&t=183s
After some changes in the styles.xml and a new added styles.xml for v21 (for backward compatibility), My UI Screen is completely black (I have to set background color on my own) and elements like buttons do not work. Check this picture:
The textsize was nearly invisible, I had to make it bigger. But check the buttons - they are not even buttons! Yeah I did not add constraints yet, I just want to show you what's going on.
The xml code for the design should be fine, I just took it from another project of mine, but in case it is important here:
activity_main.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"
android:background="#ffffff"
tools:context=".MainActivity">
<Button
android:id="#+id/button"
android:layout_width="85dp"
android:layout_height="64dp"
android:text="Button"
android:textSize="20sp"
tools:layout_editor_absoluteX="127dp"
tools:layout_editor_absoluteY="97dp" />
<Button
android:id="#+id/button2"
android:layout_width="124dp"
android:layout_height="71dp"
android:text="Button"
android:textSize="20sp"
tools:layout_editor_absoluteX="125dp"
tools:layout_editor_absoluteY="223dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
The important changes - and I think that's what has caused the error - is this: I changed the styles.xml.
styles.xml:
<resources>
<!-- below api 21 -->
<style name="AppMaterialTheme" parents="SuperMaterialTheme">
</style>
<style name="SuperMaterialTheme" parent="Theme.AppCompat.Light">
<!-- Customize your theme here. -->
<!-- muss 500 tint sein -->
<item name="colorPrimary">#color/colorPrimary</item>
<!-- muss 700 tint sein -->
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<!-- muss 200 tint sein -->
<item name="colorAccent">#color/colorAccent</item>
</style>
</resources>
And I added another styles.xml for phones with API 21 or above, here is the structure:
the styles.xml under values-v21 looks like this:
values-v21/styles.xml:
<resources>
<style name="AppMaterialTheme" parents="SuperMaterialTheme">
</style>
</resources>
I have no idea what is going on and would be really thankful if someone can bring some light into the dark.
Thanks for every answer!

Change parent="Theme.AppCompat.Light" in style.xml to parent="Theme.MaterialComponents.Light", and if it's showing error there then check if you have added Material design dependency in your gradle file or not.

If you are using material library then it must needs to extend your app theme with the material theme
<style name="SuperMaterialTheme" parent="Theme.MaterialComponents.Light">
<!-- Customize your theme here. -->
....
</style>

Customizing TextInputLayout's colors on 4.x doesn't work

I'm doing the following in my syles.xml
<style name="TextLabel" parent="TextAppearance.AppCompat">
<!-- Hint color and label color in FALSE state -->
<item name="android:textColorHint">#color/app_white</item>
<item name="android:textColorHighlight">#color/app_white</item>
<item name="android:textColorLink">#color/app_white</item>
<item name="android:textSize">#dimen/app_text_small</item>
<!-- Label color in TRUE state and bar color FALSE and TRUE State -->
<item name="colorAccent">#color/app_white</item>
<item name="colorControlNormal">#color/app_white</item>
<item name="colorControlActivated">#color/app_white</item>
</style>
and then setting the style to the TextInputLayout like so: android:theme="#style/TextLabel"
My problem is that it won't set the colors of the bottom border to white, nor the floating text. At least not on 4.1.1 and 4.2.2 Any ideas? On 5.0 and above it works just fine.

Create a style for your text appearance in this way.
<style name="TextAppearence.App.TextInputLayout" parent="#android:style/TextAppearance">
<item name="android:textColor">#color/colorPrimary</item>
</style>
Implementation code for your layout is given below.
<android.support.design.widget.TextInputLayout
android:id="#+id/input_layout_email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
app:hintTextAppearance="#style/TextAppearence.App.TextInputLayout">
<EditText
android:id="#+id/et_Email_Login"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/transparent"
android:hint="#string/hint_email" />
</android.support.design.widget.TextInputLayout>

Apparently the problem is that pre Lollipop the OS doesn't know the android:theme attribute. So what I did was move all the custom attributes from the TextLabel style to the maine style that overrides the app compat one directly.
i.e.
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
This seemed to be just fine on pre Lollipop.

ImageButton background color with appcompat

I've got problems to have a good background from an AppCompatImageButton, just to try I'm comparing this two layouts:
<android.support.v7.widget.AppCompatImageButton
android:id="#+id/imageButtonI"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:contentDescription="#string/icolor"
android:tint="#color/accent"
app:srcCompat="#drawable/magnify"/>
<ImageButton
android:id="#+id/imageButtonS"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:contentDescription="#string/scolor"
android:tint="#color/accent"
android:src="#drawable/magnify"/>
and the style file:
<style name="AppBaseTheme" parent="android:Theme.Material">
<item name="android:colorPrimary">#color/primary</item>
<item name="android:colorPrimaryDark">#color/primaryDark</item>
<item name="android:colorAccent">#color/accent</item>
</style>
As you can see from this image however, the background of ImageButton is "normal" while there isn't any background in the appcompat one. How can I have the "normal" background using AppCompatImageButton?

A good way to style the Button is to use the style #style/Widget.AppCompat.Button.Colored.
The Widget.AppCompat.Button.Colored style extends the Widget.AppCompat.Button style and applies automatically the accent color you selected in your app theme.
<Button
style="#style/Widget.AppCompat.Button.Colored"
/>
To customize the background color without changing the accent color in your main theme you can create a custom theme for your Button using the android:theme attribute and extending the ThemeOverlay theme.
<Button
style="#style/Widget.AppCompat.Button.Colored"
android:theme="#style/MyButtonTheme"/>
defining the following theme:
<!-- res/values/themes.xml -->
<style name="MyButtonTheme" parent="ThemeOverlay.AppCompat.Light">
<item name="colorAccent">#color/my_color</item>
</style>

I am not sure which version of support library are you using, but before there was bug in the library which is reported here,
https://code.google.com/p/android/issues/detail?id=78428
But they have resolved it in the latest update,
Yes, it appears to work now with the introduction of
android.support.v7.widget.AppCompatButton in AppCompat v22.1.0, color
can be controlled at overall theme level with "colorButtonNormal".
http://android-developers.blogspot.com/2015/04/android-support-library-221.html
http://chris.banes.me/2015/04/22/support-libraries-v22-1-0/
for theme
<item name="colorButtonNormal">#color/button_color</item>
for version 21
<item name="android:colorButtonNormal">#color/button_color</item>
Hope this will help you.
Thanks

Android Button background color not changing

In this android project im creating a default button style.
my styles.xml
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="android:buttonStyle">#style/ButtonStlye123</item>
</style>
<style name="ButtonStlye123" parent="android:style/Widget.Button">
<item name="android:textSize">19dp</item>
<item name="android:layout_margin">8dp</item>
<item name="android:padding">8dp</item>
<item name="android:textColor">#color/ColorDivider</item>
<item name="android:background">#color/ColorAccent</item>
</style>
my button in a fragment.
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/btnLogin"
android:id="#+id/btn_login"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:theme="#style/ButtonStlye123"
android:onClick="login" />
In the preview in android studio it looks exactly like I want, but when I run the app on my device the background color is gray ("default button color"). If i change the text color in my styles.xml like:
<item name="android:textColor">#color/ColorPrimary</item>
it changes (also on my device) so the custom style is loading, i tryd different colors (that worked for the text) for the button but it wont change.
Why isnt my background color loading?

Try use AppCompactButton
instead of
<Button
use
<androidx.appcompat.widget.AppCompatButton
that will do the trick
Update: 01/06/2021
Found out that the above will not work on earlier Android versions.
For materiel design Button use
app:backgroundTint="#color/green"

Please Use androidx.appcompat.widget.AppCompatButton instead of Button.
<androidx.appcompat.widget.AppCompatButton
android:id="#+id/button_id_Login"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_below="#id/textInnputLayout_editText_id_password"
android:layout_centerHorizontal="true"
android:layout_marginTop="50dp"
android:text="#string/Login_screen_button_text"
android:background="#drawable/login_button_style"
android:textAllCaps="false">
</androidx.appcompat.widget.AppCompatButton>

You might be using targetSdkVersion 30 material theme
The solution is change theme.xml style
From
<style name="AppTheme" parent="Theme.MaterialComponents.DayNight.NoActionBar">
To
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">

<style name="AppTheme" parent="Theme.MaterialComponents.Light.DarkActionBar">
Replace with
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
Changing MaterialComponents to AppCompat works for me..

I think you need to change your attribute from "theme" to "style". These files are intended for different things, so are used differently.
Style is used to assign attributes to individual views or components, and Theme is used to apply attributes to the entire app.
So try this instead:
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/btnLogin"
android:id="#+id/btn_login"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
<!-- This attribute was changed -->
android:style="#style/ButtonStlye123"
android:onClick="login" />
You should also split these different types of XML into the correct files as appropriate (styles.xml and themes.xml - instead of keeping them all in the same file). This is convention, and won't effect the code compilation or execution, but is recommended as a code style.

Use this attribute backgroundTint it will help you. It work for me. Example :
android:backgroundTint="#color/md_orange_800"

if you are using Android Studio Version 4.1 and above (Beta)
check your themes.xml file in values.
<style name="Theme.NavaFlashLightV4" parent="Theme.MaterialComponents.DayNight.NoActionBar">
<!-- Primary brand color. -->
<item name="colorPrimary">#color/purple_500</item>
<item name="colorPrimaryVariant">#color/purple_700</item>
<item name="colorOnPrimary">#color/white</item>
</style>
change the attribute to #null
<style name="Theme.NavaFlashLightV4" parent="Theme.MaterialComponents.DayNight.NoActionBar">
<!-- Primary brand color. -->
<item name="colorPrimary">#null</item> <!-- HERE -->
<item name="colorPrimaryVariant">#color/purple_700</item>
<item name="colorOnPrimary">#color/white</item>
</style>
for other old versions of Android Studio
just change this attribute
<item name="colorPrimary">#color/colorPrimary</item>
to
<item name="colorPrimary">#color/#null</item>
finally set the background of the button to the drawable icon you want.
example:
<Button
android:id="#+id/btnSwitch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:background="#drawable/ic_launcher_background" /> <!--the drawable you want-->

You only need to change your App Theme from Theme.MaterialComponents.DayNight.DarkActionBar to Theme.AppCompat.Light.NoActionBar inside styles.xml file
example :
from : style name="AppTheme" parent="Theme.MaterialComponents.DayNight.NoActionBar"
To : style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar"

your style should be like this....
<style name="ButtonStlye123" >
<item name="android:textSize">19dp</item>
<item name="android:layout_margin">8dp</item>
<item name="android:padding">8dp</item>
<item name="android:textColor">#color/ColorDivider</item>
<item name="android:background">#color/ColorAccent</item>
</style>
and in layout
<Button
android:id="#+id/btn3"
style="#style/ButtonStlye123"
android:layout_width="#dimen/sixzero"
android:layout_height="#dimen/sixzero"
android:text="3" />

I am using targetSdk 30 and compileSdk 32 and I am using Button widget. Android Studio version 2021.1.1
In my case, following change worked,
In AndroidManifest.xml, under "application" tag changing "android:theme" from
android:theme="#style/Theme.AppCompat.Light.NoActionBar"
to
android:theme="#style/Theme.MaterialComponents.DayNight.NoActionBar"
I moved to Theme.AppCompat.Light.NoActionBar to remove the title bar. At first I tried to change "style" to "Theme.AppCompat.Light.NoActionBar" inside themes.xml but it didn't work for me.