From 454d8048df699f79464859663dc66eea24a4e078 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Florian=20M=C3=A4rkl?= <info@florianmaerkl.de>
Date: Sun, 20 Oct 2019 21:54:33 +0200
Subject: [PATCH] Animate Display Hosts on Android

---
 .../java/com/metallic/chiaki/main/MainActivity.kt   |  6 +++++-
 android/app/src/main/res/anim/item_drop.xml         | 13 +++++++++++++
 android/app/src/main/res/anim/layout_drop.xml       |  6 ++++++
 android/app/src/main/res/layout/activity_main.xml   |  1 +
 4 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 android/app/src/main/res/anim/item_drop.xml
 create mode 100644 android/app/src/main/res/anim/layout_drop.xml

diff --git a/android/app/src/main/java/com/metallic/chiaki/main/MainActivity.kt b/android/app/src/main/java/com/metallic/chiaki/main/MainActivity.kt
index 1814a98..6d06d7d 100644
--- a/android/app/src/main/java/com/metallic/chiaki/main/MainActivity.kt
+++ b/android/app/src/main/java/com/metallic/chiaki/main/MainActivity.kt
@@ -24,6 +24,7 @@ import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
+import android.view.animation.AnimationUtils
 import androidx.lifecycle.Observer
 import androidx.lifecycle.ViewModelProviders
 import androidx.recyclerview.widget.LinearLayoutManager
@@ -72,7 +73,10 @@ class MainActivity : AppCompatActivity()
 		val recyclerViewAdapter = DisplayHostRecyclerViewAdapter()
 		hostsRecyclerView.adapter = recyclerViewAdapter
 		hostsRecyclerView.layoutManager = LinearLayoutManager(this)
-		viewModel.displayHosts.observe(this, Observer { recyclerViewAdapter.hosts = it })
+		viewModel.displayHosts.observe(this, Observer {
+			recyclerViewAdapter.hosts = it
+			hostsRecyclerView.scheduleLayoutAnimation()
+		})
 
 		viewModel.discoveryActive.observe(this, Observer { active ->
 			discoveryMenuItem?.let { updateDiscoveryMenuItem(it, active) }
diff --git a/android/app/src/main/res/anim/item_drop.xml b/android/app/src/main/res/anim/item_drop.xml
new file mode 100644
index 0000000..65728b9
--- /dev/null
+++ b/android/app/src/main/res/anim/item_drop.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+    android:duration="200">
+    <translate
+        android:fromXDelta="20%"
+        android:toXDelta="0"
+        android:interpolator="@android:anim/decelerate_interpolator"/>
+
+    <alpha
+        android:fromAlpha="0.0"
+        android:toAlpha="1.0"
+        android:interpolator="@android:anim/decelerate_interpolator"/>
+</set>
\ No newline at end of file
diff --git a/android/app/src/main/res/anim/layout_drop.xml b/android/app/src/main/res/anim/layout_drop.xml
new file mode 100644
index 0000000..c2421a2
--- /dev/null
+++ b/android/app/src/main/res/anim/layout_drop.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layoutAnimation
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:animation="@anim/item_drop"
+    android:delay="15%"
+    android:animationOrder="normal" />
\ No newline at end of file
diff --git a/android/app/src/main/res/layout/activity_main.xml b/android/app/src/main/res/layout/activity_main.xml
index a042b36..83b4542 100644
--- a/android/app/src/main/res/layout/activity_main.xml
+++ b/android/app/src/main/res/layout/activity_main.xml
@@ -14,6 +14,7 @@
         android:paddingBottom="8dp"
         android:clipToPadding="false"
         android:clipChildren="false"
+        android:layoutAnimation="@anim/layout_drop"
         app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
 
     <FrameLayout