Develop Reference

How to make buttons rounded with Material Design Theming?

I want my button to have rounded corners like:
// Image taken from google
To achieve this with material theming in android is to set the: shapeAppearanceSmallComponent to have a rounded corner.
But setting shapeAppearanceSmallComponent also affects all other components such as EditText so now they are rounded as well.
So instead of setting it to shapeAppearanceSmallComponent, I created a shapeMaterialOverlay. Set this overlay to a buttonStyle and set this button style in the theme as the default button style.
It works but only for default buttons. If I needed a TextButton as such:
<Button
...
style="#style/Widget.MaterialComponents.Button.TextButton"/>
The TextButton won't be rouned. So as a workaround, I created MyTextButton style which extends from TextButton and set the shapeOverlay there as well.
so Now if I need a TextButton, I'll do:
<Button
...
style="#style/Widget.MaterialComponents.Button.MyTextButton"/>
instead.
I will have to do this for all other button types. I was wondering whether this approach is correct and if not, can anyone guide me on how to properly do this?
Thank you very much.

Just use the app:shapeAppearanceOverlay attribute in the layout.
<com.google.android.material.button.MaterialButton
app:shapeAppearanceOverlay="#style/buttomShape"
.../>
with:
<style name="buttomShape">
<item name="cornerFamily">rounded</item>
<item name="cornerSize">50%</item>
</style>
The only way to apply it to all buttons is to define custom styles for all the button styles as you are just doing. Something like:
<style name="...." parent="Widget.MaterialComponents.Button">
<item name="shapeAppearance">#style/buttomShape</item>
</style>
<style name="..." parent="Widget.MaterialComponents.Button.TextButton">
<item name="shapeAppearance">#style/buttomShape</item>
</style>

You can set a background drawable on your button. The drawable could look like this:
<shape android:shape="rectangle">
<solid android:color="#android:color/blue" />
<corners android:radius="10dp" />
</shape>
This will give you rounded corners for your button background.

You know there is a site for creating custom layouts for buttons
here is the Link
it is a auto generated Code you don't have to code. Maybe it will be helpful for everyone

Create a drawable xml file
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle"
>
<stroke
android:color="#color/colorPrimary"
android:width="1dp" />
<corners
android:radius="30dp"
android:bottomLeftRadius="30dp"
/>
<solid
android:color="#4c95ec"
/>
</shape>

Android spinner with underline appcompat

I am using a appcompat theme for my application. Need to know how i can show underline to spinner. It is just showing anchor. I tried setting up underline using android:background but it makes the anchor disappear.

Update your support library and in XML use
Please add this style to your Spinner
style="#style/Base.Widget.AppCompat.Spinner.Underlined"

This is hacky (and not perfect) way to change spinner and underline color in appcompat theme. Main point that I customized Android support library images and xml files to change color.
1) go to support library package and copy 2 images (or download my custom from the bottom of this post)
/your-app/build/intermediates/exploded-aar/com.android.support/appcompat-v7/23.1.0/res/drawable-hdpi/abc_spinner_mtrl_am_alpha.9.png
and
/your-app/build/intermediates/exploded-aar/com.android.support/appcompat-v7/23.1.0/res/drawable-hdpi/abc_textfield_default_mtrl_alpha.9.png
2) Make a copy of those images
3) Change color of abc_spinner_mtrl_am_alpha.9.png (warning: leave black borders as they are, it's for 9 patch)
4) Change color of second bottom line of abc_textfield_default_mtrl_alpha.9.png (you can see in attached small image below)
5) Save and move files to your project drawables
6) Create bottom_line_color.xml drawable:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:top="-6dp" android:left="-6dp" android:right="-6dp">
<shape>
<stroke android:color="#color/brown" android:width="6dp"/>
</shape>
</item>
7) Create spinner_bottom_line.xml
<?xml version="1.0" encoding="utf-8"?>
<inset xmlns:android="http://schemas.android.com/apk/res/android"
android:insetLeft="#dimen/abc_control_inset_material"
android:insetTop="#dimen/abc_control_inset_material"
android:insetBottom="#dimen/abc_control_inset_material"
android:insetRight="#dimen/abc_control_inset_material">
<selector>
<item android:state_checked="false" android:state_pressed="false">
<layer-list>
<item android:drawable="#drawable/my_custom_abc_textfield_default_mtrl_alpha" />
<item android:drawable="#drawable/my_custom_abc_spinner_mtrl_am_alpha" />
</layer-list>
</item>
<item>
<layer-list>
<item android:drawable="#drawable/my_custom_abc_textfield_default_mtrl_alpha" />
<item android:drawable="#drawable/my_custom_abc_spinner_mtrl_am_alpha" />
</layer-list>
</item>
</selector>
</inset>
P.S. I couldn't achieve same visual style as default spinner (visual changes shown below). If you start using this custom spinner theme you should use it in all project.
So add to values/styles.xml
<style name="My.Spinner.Style" parent="Base.Widget.AppCompat.Spinner.Underlined">
<item name="android:background">#drawable/spinner_bottom_line</item>
</style>
And use it in application like this:
<Spinner
android:id="#+id/account_spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="#style/My.Spinner.Style"
/>
Important:
You should resize spinner and place to various drawables folders. You can find size in same path as I showed above.
There are few popular sizes:
drawables-mdpi 20x26
drawables-hdpi 29x38
drawables-xhdpi 38x50
drawables-xxhdpi 74x98
You can take my customized images from here:
my_custom_abc_spinner_mtrl_am_alpha:
my_custom_abc_textfield_default_mtrl_alpha:
Spinner example is (xxhdpi), line is mdpi (because we don't need various lines in various drawable folders, so we can have only 1).
Visual difference (from android studio xml preview window) is shown here:
First line is my custom underline spinner, second is default Base.Widget.AppCompat.Spinner.Underlined

Applying style="#style/Base.Widget.AppCompat.Spinner.Underlined" didn't show any difference .Then gave android:backgroundTint and android:backgroundTintMode to spinner and it worked.
<Spinner
android:id="#+id/spBookingType"
android:spinnerMode="dropdown"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="#style/Base.Widget.AppCompat.Spinner.Underlined"
android:backgroundTint="#ff000000"
android:backgroundTintMode="src_in" />

in styles.xml
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="android:spinnerStyle">#style/holoSpinner</item>
</style>
<style name="holoSpinner" parent="Widget.AppCompat.Spinner.Underlined">
<item name="android:textSize">16sp</item>
<item name="android:textColor">#color/colorPrimary</item>
</style>
========================
in Layout
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp">
<Spinner
android:id="#+id/spinCountry"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/edit_text_bottom_border"
android:paddingBottom="10dp" />
</android.support.design.widget.TextInputLayout>
===============================================
edit_text_bottom_border.xml file in Drawable
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:bottom="1dp"
android:left="-3dp"
android:right="-3dp"
android:top="-3dp">
<shape android:shape="rectangle">
<stroke
android:width="1dp"
android:color="#535353" />
<!--android:color="#535353" />-->
</shape>
</item>
</layer-list>

Android Material Design Button Styles

I'm confused on button styles for material design. I'd like to get colorful raised buttons like in the attached link., like the "force stop" and "uninstall" buttons seen under the usage section. Are there available styles or do I need to define them?
http://www.google.com/design/spec/components/buttons.html#buttons-usage
I couldn't find the default button styles.
Example:
<Button style="#style/PrimaryButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Calculate"
android:id="#+id/button3"
android:layout_below="#+id/editText5"
android:layout_alignEnd="#+id/editText5"
android:enabled="true" />
If I try to change the background color of the button by adding
android:background="#color/primary"
all of the styles go away, such as the touch animation, shadow, rounded corner, etc.

I will add my answer since I don't use any of the other answers provided.
With the Support Library v7, all the styles are actually already defined and ready to use, for the standard buttons, all of these styles are available:
style="#style/Widget.AppCompat.Button"
style="#style/Widget.AppCompat.Button.Colored"
style="#style/Widget.AppCompat.Button.Borderless"
style="#style/Widget.AppCompat.Button.Borderless.Colored"
Widget.AppCompat.Button:
Widget.AppCompat.Button.Colored:
Widget.AppCompat.Button.Borderless
Widget.AppCompat.Button.Borderless.Colored:
To answer the question, the style to use is therefore
<Button style="#style/Widget.AppCompat.Button.Colored"
.......
.......
.......
android:text="Button"/>
How to change the color
For the whole app:
The color of all the UI controls (not only buttons, but also floating action buttons, checkboxes etc.) is managed by the attribute colorAccent as explained here.
You can modify this style and apply your own color in your theme definition:
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
...
<item name="colorAccent">#color/Orange</item>
</style>
For a specific button:
If you need to change the style of a specific button, you can define a new style, inheriting one of the parent styles described above. In the example below I just changed the background and font colors:
<style name="AppTheme.Button" parent="Widget.AppCompat.Button.Colored">
<item name="colorButtonNormal">#color/Red</item>
<item name="android:textColor">#color/White</item>
</style>
Then you just need to apply this new style on the button with:
android:theme="#style/AppTheme.Button"
To set a default button design in a layout, add this line to the styles.xml theme:
<item name="buttonStyle">#style/btn</item>
where #style/btn is your button theme. This sets the button style for all the buttons in a layout with a specific theme

Simplest Solution
Step 1: Use the latest support library
compile 'com.android.support:appcompat-v7:25.2.0'
Step 2: Use AppCompatActivity as your parent Activity class
public class MainActivity extends AppCompatActivity
Step 3: Use app namespace in your layout XML file
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
Step 4: Use AppCompatButton instead of Button
<android.support.v7.widget.AppCompatButton
android:id="#+id/buttonAwesome"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Awesome Button"
android:textColor="#color/whatever_text_color_you_want"
app:backgroundTint="#color/whatever_background_color_you_want"/>

If I understand you correctly, you want to do something like this:
In such case, it should be just enough to use:
<item name="android:colorButtonNormal">#2196f3</item>
Or for API less than 21:
<item name="colorButtonNormal">#2196f3</item>
In addition to Using Material Theme Tutorial.
Animated variant is here.

You can use the
Material Component library.
Add the dependency to your build.gradle:
dependencies { implementation ‘com.google.android.material:material:1.3.0’ }
Then add the MaterialButton to your layout:
<com.google.android.material.button.MaterialButton
style="#style/Widget.MaterialComponents.Button.OutlinedButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/app_name"
app:strokeColor="#color/colorAccent"
app:strokeWidth="6dp"
app:layout_constraintStart_toStartOf="parent"
app:shapeAppearance="#style/MyShapeAppearance"
/>
You can check the full documentation here and API here.
To change the background color you have 2 options.
Using the backgroundTint attribute.
Something like:
<style name="MyButtonStyle"
parent="Widget.MaterialComponents.Button">
<item name="backgroundTint">#color/button_selector</item>
//..
</style>
It will be the best option in my opinion. If you want to override some theme attributes from a default style then you can use new materialThemeOverlay attribute.
Something like:
<style name="MyButtonStyle"
parent="Widget.MaterialComponents.Button">
<item name=“materialThemeOverlay”>#style/GreenButtonThemeOverlay</item>
</style>
<style name="GreenButtonThemeOverlay">
<!-- For filled buttons, your theme's colorPrimary provides the default background color of the component -->
<item name="colorPrimary">#color/green</item>
</style>
The option#2 requires at least the version 1.1.0.
You can use one of these styles:
Filled Button (default): style="#style/Widget.MaterialComponents.Button
Text Button: style="#style/Widget.MaterialComponents.Button.TextButton"
OutlinedButton: style="#style/Widget.MaterialComponents.Button.OutlinedButton"
OLD Support Library:
With the new Support Library 28.0.0, the Design Library now contains the MaterialButton.
You can add this button to our layout file with:
<android.support.design.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="YOUR TEXT"
android:textSize="18sp"
app:icon="#drawable/ic_android_white_24dp" />
By default this class will use the accent colour of your theme for the buttons filled background colour along with white for the buttons text colour.
You can customize the button with these attributes:
app:rippleColor: The colour to be used for the button ripple effect
app:backgroundTint: Used to apply a tint to the background of the button. If you wish to change the background color of the button, use this attribute instead of background.
app:strokeColor: The color to be used for the button stroke
app:strokeWidth: The width to be used for the button stroke
app:cornerRadius: Used to define the radius used for the corners of the button

Here is how I got what I wanted.
First, made a button (in styles.xml):
<style name="Button">
<item name="android:textColor">#color/white</item>
<item name="android:padding">0dp</item>
<item name="android:minWidth">88dp</item>
<item name="android:minHeight">36dp</item>
<item name="android:layout_margin">3dp</item>
<item name="android:elevation">1dp</item>
<item name="android:translationZ">1dp</item>
<item name="android:background">#drawable/primary_round</item>
</style>
The ripple and background for the button, as a drawable primary_round.xml:
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="#color/primary_600">
<item>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="1dp" />
<solid android:color="#color/primary" />
</shape>
</item>
</ripple>
This added the ripple effect I was looking for.

Beside android.support.design.button.MaterialButton (which mentioned by Gabriele Mariotti),
There is also another Button widget called com.google.android.material.button.MaterialButton which has different styles and extends from AppCompatButton:
style="#style/Widget.MaterialComponents.Button"
style="#style/Widget.MaterialComponents.Button.UnelevatedButton"
style="#style/Widget.MaterialComponents.Button.TextButton"
style="#style/Widget.MaterialComponents.Button.Icon"
style="#style/Widget.MaterialComponents.Button.TextButton.Icon"
Filled, elevated Button (default):
style="#style/Widget.MaterialComponents.Button"
Filled, unelevated Button:
style="#style/Widget.MaterialComponents.Button.UnelevatedButton"
Text Button:
style="#style/Widget.MaterialComponents.Button.TextButton"
Icon Button:
style="#style/Widget.MaterialComponents.Button.Icon"
app:icon="#drawable/icon_24px" // Icons can be added from this
A text Button with an icon::
Read: https://material.io/develop/android/components/material-button/
A convenience class for creating a new Material button.
This class supplies updated Material styles for the button in the
constructor. The widget will display the correct default Material
styles without the use of the style flag.

Here is a sample that will help in applying button style consistently across your app.
Here is a sample Theme I used with the specific styles..
<style name="MyTheme" parent="#style/Theme.AppCompat.Light">
<item name="colorPrimary">#color/primary</item>
<item name="colorPrimaryDark">#color/primary_dark</item>
<item name="colorAccent">#color/accent</item>
<item name="android:buttonStyle">#style/ButtonAppTheme</item>
</style>
<style name="ButtonAppTheme" parent="android:Widget.Material.Button">
<item name="android:background">#drawable/material_button</item>
</style>
This is how I defined the button shape & effects inside res/drawable-v21 folder...
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="?attr/colorControlHighlight">
<item>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="2dp" />
<solid android:color="#color/primary" />
</shape>
</item>
</ripple>
2dp corners are to keep it consistent with Material theme.

I tried a lot of answer & third party libs, but none was keeping the border and raised effect on pre-lollipop while having the ripple effect on lollipop without drawback. Here is my final solution combining several answers (border/raised are not well rendered on gifs due to grayscale color depth) :
Lollipop
Pre-lollipop
build.gradle
compile 'com.android.support:cardview-v7:23.1.1'
layout.xml
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/card"
card_view:cardElevation="2dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
card_view:cardMaxElevation="8dp"
android:layout_margin="6dp"
>
<Button
android:id="#+id/button"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="0dp"
android:background="#drawable/btn_bg"
android:text="My button"/>
</android.support.v7.widget.CardView>
drawable-v21/btn_bg.xml
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="?attr/colorControlHighlight">
<item android:drawable="?attr/colorPrimary"/>
</ripple>
drawable/btn_bg.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#color/colorPrimaryDark" android:state_pressed="true"/>
<item android:drawable="#color/colorPrimaryDark" android:state_focused="true"/>
<item android:drawable="#color/colorPrimary"/>
</selector>
Activity's onCreate
final CardView cardView = (CardView) findViewById(R.id.card);
final Button button = (Button) findViewById(R.id.button);
button.setOnTouchListener(new View.OnTouchListener() {
ObjectAnimator o1 = ObjectAnimator.ofFloat(cardView, "cardElevation", 2, 8)
.setDuration
(80);
ObjectAnimator o2 = ObjectAnimator.ofFloat(cardView, "cardElevation", 8, 2)
.setDuration
(80);
#Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
o1.start();
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
o2.start();
break;
}
return false;
}
});

1) You can create rounded corner button by defining xml drawable and you can increase or decrease radius to increase or decrease roundness of button corner.
Set this xml drawable as background of button.
<?xml version="1.0" encoding="utf-8"?>
<inset xmlns:android="http://schemas.android.com/apk/res/android"
android:insetLeft="4dp"
android:insetTop="6dp"
android:insetRight="4dp"
android:insetBottom="6dp">
<ripple android:color="?attr/colorControlHighlight">
<item>
<shape android:shape="rectangle"
android:tint="#0091ea">
<corners android:radius="10dp" />
<solid android:color="#1a237e" />
<padding android:bottom="6dp" />
</shape>
</item>
</ripple>
</inset>
2) To change default shadow and shadow transition animation between button states, you need to define selector and apply it to button using android:stateListAnimator property. For complete button customization reference : http://www.zoftino.com/android-button

I've just created an android library, that allows you to easily modify the button color and the ripple color
https://github.com/xgc1986/RippleButton
<com.xgc1986.ripplebutton.widget.RippleButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/btn"
android:text="Android button modified in layout"
android:textColor="#android:color/white"
app:buttonColor="#android:color/black"
app:rippleColor="#android:color/white"/>
You don't need to create an style for every button you want wit a different color, allowing you to customize the colors randomly

// here is the custom button style
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<gradient
android:angle="45"
android:centerColor="#color/colorPrimary"
android:startColor="#color/colorPrimaryDark"
android:endColor="#color/colorAccent"
>
</gradient>
<corners
android:topLeftRadius="10dp"
android:topRightRadius="10dp"
android:bottomLeftRadius="10dp"
android:bottomRightRadius="10dp"
>
</corners>
<stroke
android:width="2dp"
android:color="#color/colorWhite"
>
</stroke>
</shape>
</item>
</selector>

you can give aviation to the view by adding z axis to it and can have default shadow to it. this feature was provided in L preview and will be available after it release. For now you can simply add a image the gives this look for button background

Change default design theme to customized color

I am very new to Android Studio. As a beginner I have created a simple app just for testing purpose and to view the appearance of Android studio material theme. I am currently working with latest version ie. L preview - Studio 0.8.2 version.
Here, I have just created textview, edittext, radio buttons and checkboxes. When I select male or female, it appears sky blue color. Could I be able to change sky blue color as a green or yellow color?
I do not know what is the name for that. From the picture can able to see edittext, radio buttons and checkboxes selected state as a sky blue color. When I try to click or select anything then those checkboxes or radio buttons need to change from default color to other colors like green or yellow!
Code
In res/values/styles.xml,
<resources>
<!-- Base application theme. -->
<color name="custom_theme_color">#b0b0ff</color>
<style name="CustomTheme" parent="android:Theme.Material">
<item name="android:colorBackground">#color/custom_theme_color</item>
</style>
</resources>
In Android Studio Manifest.xml,
android:theme="#style/CustomTheme" >
Is there any other possible to change from default sky blue color to green or yellow or purple?
Is there any other way to change default sky blue color theme to other colors like pink or green?
How could I do this?

First Method:
In res/values-v21/styles.xml,
<style name="AppTheme" parent="android:Theme.Material.Light.DarkActionBar">
<item name="android:colorAccent">#color/custom_theme_color</item>
<item name="android:colorPrimaryDark">#color/custom_theme_color</item>
<item name="android:colorPrimary">#color/custom_theme_color</item>
</style>
The above code is simple and working well. In Android studio, it could be able to change from default sky blue color to any other colors like pink or green!
Second Method:
Create 3 files under xml ie. res/xml such as checked.xml, unchecked.xml and custom_checkbox.xml
checked.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<stroke android:width="2px" android:color="#FF00FF" />
<size android:height="20dp" android:width="20dp"/>
</shape>
unchecked.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<stroke android:width="2px" android:color="#ffc0c0c0" />
<size android:height="20dp" android:width="20dp"/>
</shape>
custom_checkbox.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="true"
android:drawable="#xml/checked" />
<item android:state_pressed="true"
android:drawable="#xml/checked" />
<item android:drawable="#xml/unchecked" />
</selector>
From above second method, it (customized file) also could be able to create any shapes and colors based on our requirements. Even we can be able to customize the style, shapes and themes for a widget by using 2nd method.
Above two methods are working fine for me!

Also in from v23 with AppCompat you can use android.support.v7.widget.AppCompatCheckBox and change CheckBox style like this:
<android.support.v7.widget.AppCompatCheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:theme="#style/CheckBox"
/>
where in style.xml:
<style name="CheckBox" parent="Widget.AppCompat.CompoundButton.CheckBox">
<item name="colorControlNormal">#color/checkbox_normal</item> <!-- border color -->
<item name="colorControlActivated">#color/checkbox_activated</item> <!-- fill color -->
<item name="colorControlHighlight">#color/checkbox_highlight</item> <!-- animation color -->
</style>

Android : change button text and background color

How can I change both text and background colors when my button is pressed, with xml ?
To change text color I can do :
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:color="mycolor"/>
<item android:color="mycolor2"/>
</selector>
To change the background I can do (using it in a selector/item with drawable reference) :
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#FF0079FF" />
</shape>
But how can I do both ? Let's say I want to have :
Default : black text / white background
Pressed : white text / blue background
EDIT : answer
I totaly forgot that the background and text color are managed separately, so this is how I did it :
<Button
android:textColor="#color/filtersbuttoncolors"
android:background="#drawable/mybackgroundcolors" />
In mybackgroundcolors.xml I manage the background and in filtersbuttoncolors.xml I manage the text color. In both xml files I manage the status (pressed, selected, default)

Since API level 21 you can use :
android:backgroundTint="#android:color/white"
you only have to add this in your xml

Here is an example of a drawable that will be white by default, black when pressed:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape>
<solid
android:color="#1E669B"/>
<stroke
android:width="2dp"
android:color="#1B5E91"/>
<corners
android:radius="6dp"/>
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp"/>
</shape>
</item>
<item>
<shape>
<gradient
android:angle="270"
android:endColor="#1E669B"
android:startColor="#1E669B"/>
<stroke
android:width="4dp"
android:color="#1B5E91"/>
<corners
android:radius="7dp"/>
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp"/>
</shape>
</item>
</selector>

I think doing this way is much simpler:
button.setBackgroundColor(Color.BLACK);
And you need to import android.graphics.Color; not: import android.R.color;
Or you can just write the 4-byte hex code (not 3-byte) 0xFF000000 where the first byte is setting the alpha.

Just complementing #Jonsmoke's answer.
For API level 21 and above you can use :
android:backgroundTint="#android:color/white"
in XML for the button layout.
For API level below 21 use an AppCompatButton using app namespace instead of android for backgroundTint.
For example:
<android.support.v7.widget.AppCompatButton
android:id="#+id/my_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="My Button"
app:backgroundTint="#android:color/white" />

add below line in styles.xml
<style name="AppTheme.Gray" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorButtonNormal">#color/colorGray</item>
</style>
in button, add android:theme="#style/AppTheme.Gray", example:
<Button
android:theme="#style/AppTheme.Gray"
android:textColor="#color/colorWhite"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#android:string/cancel"/>

When you create an App, a file called styles.xml will be created in your res/values folder. If you change the styles, you can change the background, text color, etc for all your layouts. That way you don’t have to go into each individual layout and change the it manually.
styles.xml:
<resources xmlns:android="http://schemas.android.com/apk/res/android">
<style name="Theme.AppBaseTheme" parent="#android:style/Theme.Light">
<item name="android:editTextColor">#295055</item>
<item name="android:textColorPrimary">#295055</item>
<item name="android:textColorSecondary">#295055</item>
<item name="android:textColorTertiary">#295055</item>
<item name="android:textColorPrimaryInverse">#295055</item>
<item name="android:textColorSecondaryInverse">#295055</item>
<item name="android:textColorTertiaryInverse">#295055</item>
<item name="android:windowBackground">#drawable/custom_background</item>
</style>
<!-- Application theme. -->
<style name="AppTheme" parent="AppBaseTheme">
<!-- All customizations that are NOT specific to a particular API-level can go here. -->
</style>
parent="#android:style/Theme.Light" is Google’s native colors. Here is a reference of what the native styles are:
https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/core/res/res/values/themes.xml
name="Theme.AppBaseTheme" means that you are creating a style that inherits all the styles from parent="#android:style/Theme.Light".
This part you can ignore unless you want to inherit from AppBaseTheme again. = <style name="AppTheme" parent="AppBaseTheme">
#drawable/custom_background is a custom image I put in the drawable’s folder. It is a 300x300 png image.
#295055 is a dark blue color.
My code changes the background and text color. For Button text, please look through Google’s native stlyes (the link I gave u above).
Then in Android Manifest, remember to include the code:
<application
android:theme="#style/Theme.AppBaseTheme">

Just use a MaterialButton and the app:backgroundTint and android:textColor attributes:
<MaterialButton
app:backgroundTint="#color/my_color"
android:textColor="#android:color/white"/>

add below lines in the styles.xml
<style name="AppTheme.Gray" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorGray</item>
</style>
and in button, add android:theme="#style/AppTheme.Gray", example:
<Button
android:theme="#style/AppTheme.Gray"
android:textColor="#color/colorWhite"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#android:string/cancel"/>