Android Floating Action Button- Simple Example

1. The Project Download Link

The entire project can be downloaded from this github repo.

2. Adding Dependencies

We just need to add the following sentence to build.gradle. This allows you to add supporting material design components and patterns to your apps.

 compile 'com.android.support:design:24.2.1'

3. Adding Floating Action Button

Next, we need to add floating action button to activity_main.xml.

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="16dp"
        android:src="@android:drawable/ic_menu_send" />

The complete activity_main.xml will be like this after adding the above code.

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.example.aknay.floatingactionbutton.MainActivity">

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="16dp"
        android:src="@android:drawable/ic_menu_send" />

</android.support.design.widget.CoordinatorLayout>

4. Adding click action for Floating Action Button

Finally, all we just need to add is set on click listener for the floating action button in MainActivity. We want to see action when click on it, don’t we?

        FloatingActionButton mFloatActionButton = (FloatingActionButton) findViewById(R.id.fab_button);
        mFloatActionButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "Sending dummy email", Toast.LENGTH_SHORT).show();
            }
        });

The complete code for ‘MainActivity.java’ will be like the following code.

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 {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        FloatingActionButton mFloatActionButton = (FloatingActionButton) findViewById(R.id.fab_button);
        mFloatActionButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "Sending dummy email", Toast.LENGTH_SHORT).show();
            }
        });

    }
}

5. Run the Application

You will see this view after the application is successfully run.