Develop Reference

colorButtonNormal has no effect?

I am trying to apply a unified style on my button.
This is my v21/styles.xml
<style name="DefaultButton" parent="Widget.AppCompat.Button.Colored">
<item name="android:colorButtonNormal">#f00</item>
<item name="android:textColor">#color/colorTextSecondary</item>
</style>
I apply this to my button like this
<Button
android:id="#+id/submit_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginTop="#dimen/unit_large"
style="#style/DefaultButton"
android:text="Lemme In!" />
nothing fancy going on in here. Yet the color of my button doesn't change. Did something change over the material support packages? I am using '25.3.1'
Actually all of this is part of a greater effort I have to do to change the default button style of the application like this
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="android:buttonStyle">#style/DefaultButton</item>
</style>
I would then remove the individual styling attributes on all the buttons

Change this style="#style/DefaultButton" to
android:theme="#style/DefaultButton"

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.

Android: How do you set default view attributes?

I have multiple buttons that all have the same textSize, layout_width, etc. and I do not want to copy and paste these attributes over and over as it makes for hard to edit code. In other words, I am looking to take many of these:
<Button
android:id="#+id/button1"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#drawable/round_button_normal"
android:text="#string/button1"
android:textSize="50sp" />
And instead be able to use a preset button (where the layout_width, layout_height, layout_weight, background, and textSize are all set to the above values, by default):
<PresetButton
android:id="#+id/button1"
android:text="#string/button1" />

Just use styles.
Styles and Themes
Example:
In: res/values/styles.xml
<style name="Numbers">
<item name="android:inputType">number</item>
</style>
Use like this:
<EditText
style="#style/Numbers" />

You can use styles.xml to create a style, then you can apply that styling to each button.
http://developer.android.com/guide/topics/ui/themes.html

in your values -> style.xml file put the xml attribute
<style name="buttonConfirm" parent="#android:style/Widget.Button">
<item name="android:textColor">#FFFFFF</item>
<item name="android:textSize">15dip</item>
<item name="android:focusable">true</item>
<item name="android:clickable">true</item>
<item name="android:layout_width">wrap_content</item>
<item name="android:layout_height">wrap_content</item>
</style>
and in your layout call it by this xml
<Button
android:id="#+id/button1"
style="#style/buttonConfirm"
android:text="Button"
/>

android: set textColor with textAppearance attribute

I have created several styles for font in my app.
How can I add these styles to views? - 1) Using style attribute 2) Using textAppearance.
To use style is not an option because views may have other attributes (margins, paddings, min width, etc - I cant specify 2 styles for a view), so I need to specify text-related attributes separately, but android:textColor doesnt work here:
styles.xml:
<style name="TextAppearance.baseText" parent="#android:style/TextAppearance">
<item name="android:textAppearance">?android:textAppearanceSmall</item>
<item name="android:typeface">sans</item>
<item name="android:textColor">#android:color/white</item>
<item name="android:textSize">15sp</item>
</style>
layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="65dp"
android:orientation="horizontal" >
<Button
android:id="#+id/backButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sometext"
android:textAppearance="#style/TextAppearance.baseText"/>
</RelativeLayout>
Why doesnt it work? How can I specify textcolor in textappearance?

As Oderik has mentioned in the comments, the Button view has a default value for it's textColor attribute. This textColor value overrides whatever value is set through the textAppearance attribute. Therefore you have two options:
Set the textColor to #null in the style:
<style name="Application.Button">
<item name="android:textAppearance">#style/Application.Text.Medium.White</item>
<item name="android:textColor">#null</item>
</style>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#style/Application.Button" />
Set the textColor to #null in the Button XML:
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#style/Application.Button"
android:textColor="#null" />

It works. Your text color is white - the same as default color. Put there any other color like <item name="android:textColor">#AA6699</item> and you will see difference.
Second thing is that you are trying to set text appearance in text appearance - doen's make sense. If you want to set small letters do this using parent parent="#android:style/TextAppearance.Small and delete line <item name="android:textAppearance">?android:textAppearanceSmall</item>
Third thing is that you want to have small letters and put additional textSize - doesn't make sense.
Try this, works for me:
<style name="BaseText" parent="#android:style/TextAppearance.Small">
<item name="android:typeface">sans</item>
<item name="android:textColor">#AA7755</item>
</style>
If you want to set everything in style:
<style name="BaseText" parent="#android:style/TextAppearance.Large">
<item name="android:typeface">sans</item>
<item name="android:textColor">#AA7755</item>
</style>
<style name="BaseText.Margins">
<item name="android:layout_margin">10dip</item>
</style>
Where BaseText.Margins inherits from BaseText.
Then you can just use:
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
style="#style/BaseText.Margins" />

If you want to use android:TextAppearance instead of style: to set your android:textColor, you need to set android:textColor=#null on your TextView.
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:textAppearance="#style/TextAppearance.AppCompat.Medium.MySubheader"
android:textColor="#null"
tools:text="Section" />
Then it will inherit correctly from your android:TextAppearance
<style name="TextAppearance.AppCompat.Medium.MySubheader">
<item name="android:fontFamily">sans-serif-medium</item>
<item name="android:textSize">16sp</item>
<item name="android:textColor">#color/black_54</item>
</style>

TextColor defined in style being applied to TextView, but not Button?

I've defined some style resources that include TextAppearance with a defined TextColor. I then apply the styles to some TextViews and Buttons. All the styles come through with the TextView, but not the Button. For some reason, the textColor attribute is not showing up. Is this a bug, or am I missing something in the case of the Button?
Here is the style definition:
<?xml version="1.0" encoding="UTF-8"?>
<resources>
<style name="TestApp">
</style>
<!-- Text Appearances -->
<style name="TestApp.TextAppearance">
<item name="android:typeface">sans</item>
<item name="android:textStyle">bold</item>
<item name="android:textSize">16px</item>
<item name="android:textColor">#6666FF</item>
</style>
<!-- Widget Styles -->
<style name="TestApp.Widget">
<item name="android:layout_margin">3sp</item>
</style>
<style name="TestApp.Widget.Label">
<item name="android:textAppearance">#style/TestApp.TextAppearance</item>
<item name="android:layout_width">wrap_content</item>
<item name="android:layout_height">wrap_content</item>
</style>
<style name="TestApp.Widget.Switch">
<item name="android:textAppearance">#style/TestApp.TextAppearance</item>
<item name="android:layout_width">100px</item>
<item name="android:layout_height">100px</item>
</style>
</resources>
and here's the layout where I attempt to apply them:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
style="#style/TestApp.Widget.Label"
android:text="This is my label." />
<TextView
style="#style/TestApp.Widget.Label"
android:text="This is my disabled label."
android:enabled="false" />
<Button
style="#style/TestApp.Widget.Switch"
android:text="This is my switch." />
<Button
style="#style/TestApp.Widget.Switch"
android:text="This is my disabled switch."
android:enabled="false" />
</LinearLayout>

Apparently the way to achieve this is to override the textColor attribute in the button styling. Android does it this way in their Global Theme Styles:
https://android.googlesource.com/platform/frameworks/base/+/master/core/res/res/values/styles.xml
I'd love to understand why this is the case.

For the case of Buttons, there are two ways to define text color through attributes: textColor and through a style defined by textAppearance.
The value set by textColor (which is set by the default style) will override any text color value set by the textAppearance style. Therefore you must set the textColor attribute to #null in one of two ways.
Set the textColor to #null in the style:
<style name="Application.Button">
<item name="android:textAppearance">#style/Application.Text.Medium.White</item>
<item name="android:textColor">#null</item>
</style>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#style/Application.Button" />
Set the textColor to #null in the Button XML:
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#style/Application.Button"
android:textColor="#null" />

There appears to be a textAppearanceButton as well:
http://developer.android.com/reference/android/R.attr.html#textAppearanceButton
You may want to try that.