Add animation to recyclerview

app/src/main/java/me/impy/aegis/ui/views/EntryListView.java

@@ -1,5 +1,6 @@
 package me.impy.aegis.ui.views;
 
+import android.content.Context;
 import android.graphics.PorterDuff;
 import android.os.Bundle;
 import androidx.fragment.app.Fragment;
@@ -9,6 +10,8 @@ import androidx.recyclerview.widget.ItemTouchHelper;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.animation.AnimationUtils;
+import android.view.animation.LayoutAnimationController;
 
 import java.util.List;
 
@@ -23,6 +26,7 @@ public class EntryListView extends Fragment implements EntryAdapter.Listener {
     private Listener _listener;
     private SimpleItemTouchHelperCallback _touchCallback;
 
+    private RecyclerView _rvKeyProfiles;
     private PeriodProgressBar _progressBar;
     private boolean _showProgress;
 
@@ -44,13 +48,17 @@ public class EntryListView extends Fragment implements EntryAdapter.Listener {
         _progressBar.getProgressDrawable().setColorFilter(primaryColorId, PorterDuff.Mode.SRC_IN);
 
         // set up the recycler view
-        RecyclerView rvKeyProfiles = view.findViewById(R.id.rvKeyProfiles);
+        _rvKeyProfiles = view.findViewById(R.id.rvKeyProfiles);
         LinearLayoutManager mLayoutManager = new LinearLayoutManager(view.getContext());
-        rvKeyProfiles.setLayoutManager(mLayoutManager);
+        _rvKeyProfiles.setLayoutManager(mLayoutManager);
         _touchCallback = new SimpleItemTouchHelperCallback(_adapter);
         ItemTouchHelper touchHelper = new ItemTouchHelper(_touchCallback);
-        touchHelper.attachToRecyclerView(rvKeyProfiles);
+        touchHelper.attachToRecyclerView(_rvKeyProfiles);
-        rvKeyProfiles.setAdapter(_adapter);
+        _rvKeyProfiles.setAdapter(_adapter);
+
+        int resId = R.anim.layout_animation_fall_down;
+        LayoutAnimationController animation = AnimationUtils.loadLayoutAnimation(getContext(), resId);
+        _rvKeyProfiles.setLayoutAnimation(animation);
         
         _refresher = new UiRefresher(new UiRefresher.Listener() {
             @Override
@@ -71,6 +79,8 @@ public class EntryListView extends Fragment implements EntryAdapter.Listener {
         _adapter.setGroupFilter(group);
         _touchCallback.setIsLongPressDragEnabled(group == null);
         checkPeriodUniformity();
+
+        runLayoutAnimation(_rvKeyProfiles);
     }
 
     public void refresh(boolean hard) {
@@ -165,6 +175,16 @@ public class EntryListView extends Fragment implements EntryAdapter.Listener {
         checkPeriodUniformity();
     }
 
+    private void runLayoutAnimation(final RecyclerView recyclerView) {
+        final Context context = recyclerView.getContext();
+        final LayoutAnimationController controller =
+                AnimationUtils.loadLayoutAnimation(context, R.anim.layout_animation_fall_down);
+
+        recyclerView.setLayoutAnimation(controller);
+        recyclerView.getAdapter().notifyDataSetChanged();
+        recyclerView.scheduleLayoutAnimation();
+    }
+
     public interface Listener {
         void onEntryClick(DatabaseEntry entry);
         void onEntryMove(DatabaseEntry entry1, DatabaseEntry entry2);

app/src/main/res/anim/item_animation_fall_down.xml

@@ -0,0 +1,26 @@
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+    android:duration="400">
+
+    <translate
+        android:fromYDelta="-20%"
+        android:toYDelta="0"
+        android:interpolator="@android:anim/decelerate_interpolator"
+        />
+
+    <alpha
+        android:fromAlpha="0"
+        android:toAlpha="1"
+        android:interpolator="@android:anim/decelerate_interpolator"
+        />
+
+    <scale
+        android:fromXScale="105%"
+        android:fromYScale="105%"
+        android:toXScale="100%"
+        android:toYScale="100%"
+        android:pivotX="50%"
+        android:pivotY="50%"
+        android:interpolator="@android:anim/decelerate_interpolator"
+        />
+
+</set>

app/src/main/res/anim/layout_animation_fall_down.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layoutAnimation
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:animation="@anim/item_animation_fall_down"
+    android:delay="15%"
+    android:animationOrder="normal"
+    />

app/src/main/res/layout/fragment_entry_list_view.xml

@@ -19,5 +19,6 @@
         android:layout_height="0dp"
         android:scrollbars="vertical"
         android:id="@+id/rvKeyProfiles"
+        android:layoutAnimation="@anim/layout_animation_fall_down"
         android:layout_weight="1"/>
 </LinearLayout>