Fix dialog animations

android/uhabits-android/src/main/res/anim/fade_in.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2016-2020 Álinson Santos Xavier <isoron@gmail.com>
+  ~
+  ~ This file is part of Loop Habit Tracker.
+  ~
+  ~ Loop Habit Tracker is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by the
+  ~ Free Software Foundation, either version 3 of the License, or (at your
+  ~ option) any later version.
+  ~
+  ~ Loop Habit Tracker is distributed in the hope that it will be useful, but
+  ~ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+  ~ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  ~ more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along
+  ~ with this program. If not, see <http://www.gnu.org/licenses/>.
+  -->
+<set
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:interpolator="@android:anim/linear_interpolator">
+    <alpha
+        android:duration="150"
+        android:fromAlpha="0"
+        android:toAlpha="1">
+    </alpha>
+</set>

android/uhabits-android/src/main/res/anim/fade_out.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2016-2020 Álinson Santos Xavier <isoron@gmail.com>
+  ~
+  ~ This file is part of Loop Habit Tracker.
+  ~
+  ~ Loop Habit Tracker is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by the
+  ~ Free Software Foundation, either version 3 of the License, or (at your
+  ~ option) any later version.
+  ~
+  ~ Loop Habit Tracker is distributed in the hope that it will be useful, but
+  ~ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+  ~ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  ~ more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along
+  ~ with this program. If not, see <http://www.gnu.org/licenses/>.
+  -->
+<set
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:interpolator="@android:anim/linear_interpolator">
+    <alpha
+        android:duration="150"
+        android:fromAlpha="1"
+        android:toAlpha="0">
+    </alpha>
+</set>

android/uhabits-android/src/main/res/values/styles.xml

@@ -285,12 +285,18 @@
         <item name="android:lineSpacingMultiplier">1.25</item>
     </style>
 
+    <style name="PopupAnimation">
+        <item name="android:windowEnterAnimation">@anim/fade_in</item>
+        <item name="android:windowExitAnimation">@anim/fade_out</item>
+    </style>
+
     <style name="Translucent">
         <item name="android:windowNoTitle">true</item>
         <item name="android:windowBackground">@android:color/transparent</item>
         <item name="android:colorBackgroundCacheHint">@null</item>
         <item name="android:windowIsTranslucent">true</item>
         <item name="android:windowTranslucentStatus">true</item>
+        <item name="android:windowAnimationStyle">@style/PopupAnimation</item>
     </style>
 
     <style name="FormLabel">