Adding Floating Action Button (Java)

The Floating Action Button (FAB) is a circular button that triggers primary action in your app's UI. This tutorial shows you how to add the FAB to your layout , customize some of its appearance , and respond to the button taps. We will show Snackbar on FAB click.
We will use Java and Android Studio.
Minimum API: Android 2.1 is API level 7

Step 1: Create a new project OR Open your project

Step 2: Add design library in build.gradle(Module:app) under dependencies{...}

implementation 'com.android.support:design:27.1.0'

Step 3: Place an image in res>drawable folder

Step 4: Code

activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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"tools:context=".MainActivity"><TextViewandroid:id="@+id/textView"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Click Floating Action Button to show Toast..."android:textStyle="bold"android:layout_centerVertical="true"android:layout_centerHorizontal="true"/><android.support.design.widget.FloatingActionButtonandroid:id="@+id/fab"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@drawable/done"android:layout_margin="16dp"android:layout_alignParentBottom="true"android:layout_alignParentEnd="true"android:layout_alignParentRight="true" /></RelativeLayout>

MainActivity.java

package com.blogspot.devofandroid.myapplication;import android.support.design.widget.FloatingActionButton;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Toast;public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);FloatingActionButton mFab = findViewById(R.id.fab);mFab.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {Toast.makeText(MainActivity.this , "FAB is clicked..." , Toast.LENGTH_LONG).show();}});}}

Step 5: Run Project

Output