Since Material Design was introduced, Android has 3 main types of buttons:
- Floating action buttons
- Raised buttons
- Flat buttons
According to the spec, the raised button definition is:
A typically rectangular material button that lifts and displays ink reactions on press.
But why should it lift? Does your finger work like a magnet? When you press any real button, the force you apply makes the button go down.
To lift the raised button, Android uses this StateListAnimator.
From that file, we can see that:
- When the button is pressed, a z-translation (of 4dp) is applied, raising the button from 2dp to 6dp.
- When the button isn’t pressed, the elevation is 2dp
- When the button is disabled, the elevation becomes 0dp
What I did was creating a similar one, but instead of applying a positive z-translation and 2dp of elevation, I just set both to 0.
Lowering the button
Here’s a StateListAnimator that can lower the button: link.
Now, you could set this to a button using the android:stateListAnimator attribute, but with this approach, you won’t be able to use a different elevation, since the value will be hardcoded.
For this reason, I created a library that creates a custom StateListAnimator programmatically using the elevation passed to the view.
You can get it here: RaiflatButton. (Ugly name, I know, but I couldn’t figure out a better one).
Now, you can just replace your normal buttons with:
Here’s a short preview:
So, what do you think? Doesn’t this feel more natural for a button?