From bd0bbfa8023c08b29ac300986685425564e70160 Mon Sep 17 00:00:00 2001
From: Severiano Jaramillo <severiano.jaramillo@gmail.com>
Date: Wed, 11 Jul 2018 16:51:15 -0500
Subject: [PATCH] Hide add contact button when scrolling down the contacts list

---
 .../activities/BoardActivity.java             |  2 --
 .../fragments/ContactsFragment.java           | 21 +++++++++++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/app/src/main/java/cy/agorise/crystalwallet/activities/BoardActivity.java b/app/src/main/java/cy/agorise/crystalwallet/activities/BoardActivity.java
index c9f5a16..6767fa1 100644
--- a/app/src/main/java/cy/agorise/crystalwallet/activities/BoardActivity.java
+++ b/app/src/main/java/cy/agorise/crystalwallet/activities/BoardActivity.java
@@ -26,8 +26,6 @@ import android.view.View;
 import android.view.animation.LinearInterpolator;
 import android.widget.ImageView;
 
-import com.sjaramillo10.animatedtablayout.AnimatedTabLayout;
-
 import java.io.File;
 
 import butterknife.BindView;
diff --git a/app/src/main/java/cy/agorise/crystalwallet/fragments/ContactsFragment.java b/app/src/main/java/cy/agorise/crystalwallet/fragments/ContactsFragment.java
index 3d9d608..d17c179 100644
--- a/app/src/main/java/cy/agorise/crystalwallet/fragments/ContactsFragment.java
+++ b/app/src/main/java/cy/agorise/crystalwallet/fragments/ContactsFragment.java
@@ -7,6 +7,7 @@ import android.arch.paging.PagedList;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
+import android.support.design.widget.FloatingActionButton;
 import android.support.v4.app.Fragment;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
@@ -28,6 +29,8 @@ public class ContactsFragment extends Fragment {
 
     ContactListAdapter adapter;
 
+    FloatingActionButton fabAddContact;
+
     public ContactsFragment() {
         // Required empty public constructor
     }
@@ -56,6 +59,24 @@ public class ContactsFragment extends Fragment {
         adapter = new ContactListAdapter();
         rvContacts.setAdapter(adapter);
 
+        fabAddContact = getActivity().findViewById(R.id.fabAddContact);
+
+        // Hides the fab when scrolling down
+        rvContacts.addOnScrollListener(new RecyclerView.OnScrollListener() {
+            @Override
+            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
+                super.onScrolled(recyclerView, dx, dy);
+
+                // Scroll down
+                if(dy > 0 && fabAddContact.isShown())
+                    fabAddContact.hide();
+
+                // Scroll up
+                if(dy < 0 && !fabAddContact.isShown())
+                    fabAddContact.show();
+            }
+        });
+
         // Gets contacts LiveData instance from ContactsViewModel
         ContactListViewModel contactListViewModel =
                 ViewModelProviders.of(this).get(ContactListViewModel.class);