How to Apply a Style to All Buttons of an Android Application

How do I apply a style to all buttons of an Android application

For Android styles, you reference the preset attributes that Android has laid out in R.attr. In this case, it looks like you want to to reference android:buttonStyle. I think this would work:

<style name="ApplicationStyle" parent="android:Theme">
  <item name="android:buttonStyle">@style/CKButton</item>
</style>

Changing button style in the whole application

For styling your Button you can use this:

Go to the drawable folder and make an XML (e.g. button.xml) file called "style" which contains the following:

<?xml version="1.0" encoding="utf-8"?> 

<selector xmlns:android="http://schemas.android.com/apk/res/android">  

    <item>
         <shape>
             <gradient android:startColor="#449def" android:endColor="#2f6699" android:angle="270" />
             <stroke   android:width="1px"          android:color="#000000" />  
                <corners android:bottomLeftRadius="0dp"
                android:bottomRightRadius="0dp"
                android:topLeftRadius="8dp"
                android:topRightRadius="8dp"/>       
              <padding  android:left="10dp"  android:top="10dp" android:right="10dp" android:bottom="10dp" />
         </shape>  
   </item> 

</selector>

This is my code, you can make the necessary changes you want

Now call it in your layout XML (mainactivity.xml) like this

android:background="@drawable/button.xml"

Now to change the font color and style you can use the following which comes as part of the styles.xml in the values folder

<style name="buttonStyle" parent="@android:style/Widget.Button.Small">
    <item name="android:textColor">#FFFFFF</item>
    <item name="android:textSize">12sp</item>
    <item name="android:textStyle">bold</item>
</style>

Now call this in the layout XML (mainactivity.xml) like this

  style="@style/buttonStyle"

The final code is:

<Button
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_marginTop="15dp"
 android:text="@string/edit"
 android:id="@+id/btnEdit"
 android:background="@drawable/button.xml"
 style="@style/buttonStyle"
/>

Hope this helps :)

How to apply Material Theme to all buttons in application (activity)?

Figured it out. If you're testing on your phisical device and it is set on dark mode, you should make the changes in your values-night/themes.xml file, otherwise, working on your values/themes.xml should be enough

Set all button style in styles.xml

Try this style to change for just buttons in the app

  <style name="ThemeIndigo" parent="@android:style/Theme.Material.NoActionBar">
  <item name="android:buttonStyle">@style/MyButton</item>
</style>

<style name="MyButton" parent="android:Widget.Material.Button">
  <item name="android:textSize">19sp</item>
  <item name="android:layout_margin">0dip</item>
  <item name="android:background">#ff0000</item>
 </style>

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