FAB expand

fab_actions.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="88dp"
    android:layout_gravity="bottom"
    android:orientation="vertical">


    <ImageButton
        android:id="@+id/fab"
        android:layout_width="@dimen/fab_size"
        android:layout_height="@dimen/fab_size"
        android:layout_gravity="bottom|right"
        android:layout_marginBottom="16dp"
        android:layout_marginRight="16dp"
        android:background="@drawable/ripple"
        android:elevation="8dp"
        android:src="@drawable/ic_add"
        android:stateListAnimator="@anim/fab_raise"
        android:tint="@color/primary_dark" />

    <RelativeLayout
        android:id="@+id/expanded_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/accent"
        android:orientation="horizontal"
        android:padding="16dp"
        android:visibility="invisible">

        <ImageButton
            android:id="@+id/act_collapse"
            android:layout_width="56dp"
            android:layout_height="56dp"
            android:layout_alignParentRight="true"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:src="@drawable/ic_add"
            android:tint="@color/primary_dark" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_toLeftOf="@+id/act_collapse"
            android:orientation="horizontal">


            <ImageButton
                android:id="@+id/btn_action_1"
                android:layout_width="56dp"
                android:layout_height="56dp"
                android:background="?attr/selectableItemBackgroundBorderless"
                android:src="@drawable/ic_action"
                android:tint="@color/primary_dark" />

            <ImageButton
                android:id="@+id/btn_action_2"
                android:layout_width="56dp"
                android:layout_height="56dp"
                android:background="?attr/selectableItemBackgroundBorderless"
                android:src="@drawable/ic_action"
                android:tint="@color/primary_dark" />

            <ImageButton
                android:id="@+id/btn_action_3"
                android:layout_width="56dp"
                android:layout_height="56dp"
                android:background="?attr/selectableItemBackgroundBorderless"
                android:src="@drawable/ic_action"
                android:tint="@color/primary_dark" />

            <ImageButton
                android:id="@+id/btn_action_4"
                android:layout_width="56dp"
                android:layout_height="56dp"
                android:background="?attr/selectableItemBackgroundBorderless"
                android:src="@drawable/ic_action"
                android:tint="@color/primary_dark" />


        </LinearLayout>


    </RelativeLayout>

</FrameLayout>

layout_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <include layout="@layout/fab_actions"/>

</FrameLayout>

UIActivity.java

package com.materialdesign.chris.materialdesignexperimenting;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.ViewAnimationUtils;
import android.view.animation.Interpolator;

/**
 * Created by Chris Basha on 14/12/2014.
 */
public class UIActivity extends Activity {

    public static final int FAB_STATE_COLLAPSED = 0;
    public static final int FAB_STATE_EXPANDED = 1;

    public static int FAB_CURRENT_STATE = FAB_STATE_COLLAPSED;

    View mFab, mExpandedView, mCollapseFabButton;
    View act1, act2, act3, act4;
    

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

        mFab = findViewById(R.id.fab);
        mExpandedView = findViewById(R.id.expanded_view);
        mCollapseFabButton = findViewById(R.id.act_collapse);

        act1 = findViewById(R.id.btn_action_1);
        act2 = findViewById(R.id.btn_action_2);
        act3 = findViewById(R.id.btn_action_3);
        act4 = findViewById(R.id.btn_action_4);


        mFab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                revealView(mExpandedView);
                FAB_CURRENT_STATE = FAB_STATE_EXPANDED;

                 new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        mFab.setVisibility(View.GONE);
                    }
                }, 50);

                mCollapseFabButton.animate().rotationBy(135).setDuration(250).start();


            }
        });

        mCollapseFabButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                hideView(mExpandedView);

                FAB_CURRENT_STATE = FAB_STATE_COLLAPSED;

                mCollapseFabButton.animate().rotationBy(-135).setDuration(200).start();


            }
        });


    }


    public void revealView(View myView) {


        int cx = (mFab.getLeft() + mFab.getRight()) / 2;
        int cy = (mFab.getTop() + mFab.getBottom()) / 2;

        int finalRadius = Math.max(myView.getWidth(), myView.getHeight());

        Animator anim =
                ViewAnimationUtils.createCircularReveal(myView, cx, cy, 0, finalRadius);
        anim.setDuration(300);

        myView.setVisibility(View.VISIBLE);

        slideView(act1);
        slideView(act2);
        slideView(act3);
        slideView(act4);

        anim.start();


    }

    public void hideView(final View myView) {


        int cx = (mFab.getLeft() + mFab.getRight()) / 2;
        int cy = (mFab.getTop() + mFab.getBottom()) / 2;

        int initialRadius = myView.getWidth();

        Animator anim = ViewAnimationUtils.createCircularReveal(myView, cx, cy, initialRadius, 0);
        anim.setDuration(300);
        anim.setInterpolator(getLinearOutSlowInInterpolator());

        anim.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                super.onAnimationEnd(animation);

                myView.setVisibility(View.INVISIBLE);

            }
        });


        //Normally I would restore visibility when the hide animation has ended, but it doesn't look as good, so I'm doing it earlier.
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                mFab.setVisibility(View.VISIBLE);
            }
        }, 200);

        anim.start();

    }

    //Animation to slide the action buttons
    public void slideView(View view) {
        ObjectAnimator slide = ObjectAnimator.ofFloat(view, View.TRANSLATION_X, 112, 0);
        slide.setDuration(500);
        slide.setInterpolator(getLinearOutSlowInInterpolator());
        slide.start();
    }


    //Code for these: https://gist.github.com/chris95x8/4d74591bed75fd151799
    public static Interpolator getLinearOutSlowInInterpolator() {
        //Decelerate Interpolator - For elements that enter the screen
        return new CubicBezierInterpolator(0, 0, 0.2, 1);
    }

    public static Interpolator getFastInSlowOutInterpolator() {
        //Ease In Out Interpolator - For elements that change position while staying in the screen
        return new CubicBezierInterpolator(0.4, 0, 0.2, 1);
    }


}

Hey Chris! I just stumbled upon this while Googling for something specific. Is this code for pressing a FAB which would then expand a View?

Great piece of code. Thanks.