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activity_main.xml -> add CustomView -> search FloatingActionButton

- Add the following to res -> values -> styles.xml

<style name="Theme.MaterialButton" parent="AppTheme">
    <item name="colorAccent">@color/light_red</item>
    <item name="colorButtonNormal">@color/dark_red</item>
</style>

- Add the following to button XML

style="@style/Widget.AppCompat.Button.Colored"
android:theme="@style/Theme.MaterialButton"

button.setOnClickListener(new View.OnClickListener() {
  
   @Override
   public void onClick(View v) {
      //perform action
   }
});


ALTERNATIVE METHOD:

- Add "buttonClicked" method to android:onClick="" within XML layout file
- Write buttonClicked method within corresponding activity