MainActivity.java

package com.github.clans.fab.sample;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.widget.AbsListView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.github.fab.sample.R;
import com.github.clans.fab.FloatingActionButton;

import java.util.ArrayList;
import java.util.List;
import java.util.Locale;


public class MainActivity extends ActionBarActivity {

    private int mPreviousVisibleItem;

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

        Locale[] availableLocales = Locale.getAvailableLocales();
        List<String> locales = new ArrayList<>();
        for (Locale locale : availableLocales) {
            locales.add(locale.getDisplayName());
        }

        ListView listView = (ListView) findViewById(R.id.list);
        listView.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_list_item_1,
                android.R.id.text1, locales));

        final FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.hide(false);
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                fab.show(true);
                fab.setShowAnimation(AnimationUtils.loadAnimation(MainActivity.this, R.anim.show_from_bottom));
                fab.setHideAnimation(AnimationUtils.loadAnimation(MainActivity.this, R.anim.hide_to_bottom));
            }
        }, 300);

        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, FloatingMenusActivity.class));
            }
        });

        listView.setOnScrollListener(new AbsListView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
                if (firstVisibleItem > mPreviousVisibleItem) {
                    fab.hide(true);
                } else if (firstVisibleItem < mPreviousVisibleItem) {
                    fab.show(true);
                }
                mPreviousVisibleItem = firstVisibleItem;
            }
        });
    }
}