Android FloatingActionButton example

FloatingActionButton are used for a special type of promoted action. They are distinguished by a circled icon floating above the UI and have special motion behaviors related to morphing, launching, and the transferring anchor point.

Floating action buttons come in two sizes: the default and the mini. The size can be controlled with the fabSize attribute.

Example:

<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="20dp"
    android:padding="10dp"
    android:id="@+id/coordinatorLayout"
    android:background="#000050"
    tools:context=".MainActivity">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="20dp"
        android:padding="10dp"
        android:background="#005000">

        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:autoLink="web"
            android:textSize="24dp"
            android:layout_alignParentTop="true"
            android:text="http://android-er.blogspot.com/"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textStyle="bold"
            android:textSize="30dp"
            android:layout_alignParentBottom="true"
            android:text="Android FloatingActionButton example" />
    </RelativeLayout>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/floatingActionButton1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:layout_marginRight="20dp"
        android:src="@mipmap/ic_launcher"
        app:fabSize="normal"
        app:layout_anchor="@id/coordinatorLayout"
        app:layout_anchorGravity="bottom|left|end"/>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/floatingActionButton2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:layout_marginRight="20dp"
        android:src="@mipmap/ic_launcher"
        app:fabSize="mini"
        app:layout_anchor="@id/coordinatorLayout"
        app:layout_anchorGravity="bottom|right|end"/>

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

package com.example.eric.androidfloatingactionbutton;

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 {

    FloatingActionButton floatingActionButton1, floatingActionButton2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        floatingActionButton1 =
                (FloatingActionButton)findViewById(R.id.floatingActionButton1);
        floatingActionButton2 =
                (FloatingActionButton)findViewById(R.id.floatingActionButton2);

        floatingActionButton1.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this,
                        "floatingActionButton1 (normal) clicked",
                        Toast.LENGTH_LONG).show();
            }
        });

        floatingActionButton2.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this,
                        "floatingActionButton2 (mini) clicked",
                        Toast.LENGTH_LONG).show();
            }
        });
    }

}

Design Support Library is needed, refer to "Add Android Design Support Library to Android Studio Project".

Next:
- CoordinatorLayout + FloatingActionButton + Snackbar of Android Design Support Library