animate history items appearing

Author: roman01la

app/src/main/java/replete/HistoryAdapter.kt

@@ -6,6 +6,7 @@ import android.text.SpannableString
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.view.animation.AnimationUtils
 import android.widget.ArrayAdapter
 import android.widget.ListView
 import android.widget.TextView
@@ -28,6 +29,8 @@ fun inflateItem(viewHolder: HistoryAdapter.ViewHolder, item: Item) {
 class HistoryAdapter(context: Context, id: Int, val parent: ListView) :
     ArrayAdapter<Item>(context, id) {
 
+    val animation = AnimationUtils.loadAnimation(parent.context, R.anim.entry_appears)
+
     fun update(item: Item) {
         this.add(item)
         parent.post {
@@ -51,6 +54,8 @@ class HistoryAdapter(context: Context, id: Int, val parent: ListView) :
                 inflateItem(viewHolder, item)
             }
 
+            _itemView.startAnimation(animation)
+
             return _itemView
         } else {
             if (item != null) {

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

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+     android:duration="@android:integer/config_mediumAnimTime">
+
+    <translate
+            android:fromXDelta="-100%"
+            android:toXDelta="0"
+            android:interpolator="@android:anim/decelerate_interpolator"
+    />
+
+    <alpha
+            android:fromAlpha="0"
+            android:toAlpha="1"
+            android:interpolator="@android:anim/decelerate_interpolator"
+    />
+
+</set>