android Apps Tips & Tricks

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Creating Project Here i have created a Android Studio project with package shahedkhondaker .fabanimation  also Activity as  MainActivity  and layout as  activity_main . We have a larger FAB and two smaller FAB. When the larger FAB is pressed the two smaller FAB pop up. Initially the two smaller Fab are invisible.The layout  activity_main  is given as, activity_main.xml <? xml version = "1.0" encoding = "utf-8" ?> < android.support.design.widget.CoordinatorLayout      xmlns:android = "http://schemas.android.com/apk/res/android"      xmlns:app = "http://schemas.android.com/apk/res-auto"      xmlns:tools = "http://schemas.android.com/tools"      android:layout_width = "match_parent"      android:layout_height = "match_parent"      android:fitsSystemWindows = "true"      tools:context = ".MainActivity" >        < android.support.de