import com.google.android.material.button;
It is for button?
or Generalized
Yes if din't work try
import com.google.android.material.button.*;
And what about Floating Action Button
https://developer.android.com/reference/com/google/android/material/floatingactionbutton/FloatingActionButton#summary
For button I posted
For general
import com.google.android.material.*;
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What about This.... 
Really I needed the library for Snackbar
I thought that it would be better to learn from simplest to hardest 
Import last line of the chart
com.google....
So for Snackbar, we need to use-
com.google.android.material.snackbar.Snackbar
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Import that fully
Yes use it
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Thank you let me check.. 
Can I PM you?
U can pm,
import com.google.android.material.snackbar.*;
For snackbar
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As far as I know app Inventor doesn't have any library that adds the snackbar class, you would also have to add the android material design library to your extension ( which contains the Snackbar classes ). Or you would get an error that the package doesn't exist.
How can I add?
I have added this class-
com.google.android.material.floatingactionbutton.FloatingActionButtonYou would have to get the material library jar file, because it doesn't exist in the current sources.
You will find its Aar file here, you can try to extract the classes.jar file, and use it with your extension ( for the app Inventor Sources see here, for the extension template see this topic, if you are using Appybuilder, so it's not possible ):
https://mvnrepository.com/artifact/com.google.android.material/material/1.3.0
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Ya I thought same in extension template after
There won't be
So u need .jar file or .aar file...