AOSP/Music - Add Kotlin version of Music Java code

Test: none currently

Change-Id: Id7dccf22a6b3c5b7119a28ddf2a621c111af62a1
diff --git a/Android.bp b/Android.bp
index 07fa43b..f9afa8a 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,6 +1,7 @@
 android_app {
     name: "Music",
     srcs: ["src/**/*.java"],
+    resource_dirs: ["kotlin/res"],
     sdk_version: "current",
     product_specific: true,
     optimize: {
diff --git a/kotlin/Android.bp b/kotlin/Android.bp
new file mode 100644
index 0000000..3788111
--- /dev/null
+++ b/kotlin/Android.bp
@@ -0,0 +1,9 @@
+android_app {
+    name: "MusicKotlin",
+    srcs: ["src/**/*.kt"],
+    sdk_version: "current",
+    product_specific: true,
+    optimize: {
+        proguard_flags_files: ["proguard.flags"],
+    },
+}
diff --git a/kotlin/AndroidManifest.xml b/kotlin/AndroidManifest.xml
new file mode 100644
index 0000000..48d416c
--- /dev/null
+++ b/kotlin/AndroidManifest.xml
@@ -0,0 +1,107 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Copyright (C) 2017 The Android Open Source Project
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.android.music"
+	  xmlns:tools="http://schemas.android.com/tools">
+
+    <!-- Package Name -->
+    <original-package android:name="com.android.music"/>
+
+    <!-- SDK Versions -->
+    <uses-sdk android:minSdkVersion="19"
+              android:targetSdkVersion="29"/>
+
+    <!-- Permissions -->
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+
+    <!-- App Declaration -->
+    <application
+            android:allowBackup="true"
+            android:label="@string/app_name"
+            android:supportsRtl="true"
+            android:launchMode="singleTop"
+            android:requestLegacyExternalStorage="true">
+
+        <activity android:name="AudioPreview" android:theme="@android:style/Theme.Dialog"
+                  android:taskAffinity=""
+                  android:excludeFromRecents="true" android:exported="true" >
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:scheme="file"/>
+                <data android:mimeType="audio/*"/>
+                <data android:mimeType="application/ogg"/>
+                <data android:mimeType="application/x-ogg"/>
+                <data android:mimeType="application/itunes"/>
+            </intent-filter>
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="http" />
+                <data android:mimeType="audio/*"/>
+                <data android:mimeType="application/ogg"/>
+                <data android:mimeType="application/x-ogg"/>
+                <data android:mimeType="application/itunes"/>
+            </intent-filter>
+            <intent-filter
+                    android:priority="-1">
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="content" />
+                <data android:mimeType="audio/*"/>
+                <data android:mimeType="application/ogg"/>
+                <data android:mimeType="application/x-ogg"/>
+                <data android:mimeType="application/itunes"/>
+            </intent-filter>
+        </activity>
+
+        <activity android:name="com.android.music.MusicPicker"
+                  android:label="@string/music_picker_title" android:exported="true" >
+            <!-- First way to invoke us: someone asks to get content of
+                 any of the audio types we support. -->
+            <intent-filter>
+                <action android:name="android.intent.action.GET_CONTENT" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.OPENABLE" />
+                <data android:mimeType="audio/*"/>
+                <data android:mimeType="application/ogg"/>
+                <data android:mimeType="application/x-ogg"/>
+            </intent-filter>
+            <!-- Second way to invoke us: someone asks to pick an item from
+                 some media Uri. -->
+            <intent-filter>
+                <action android:name="android.intent.action.PICK" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.OPENABLE" />
+                <data android:mimeType="vnd.android.cursor.dir/audio"/>
+            </intent-filter>
+        </activity>
+
+        <service android:name="com.android.music.MediaPlaybackService"
+                 android:exported="true"
+                 android:label="Android Open Source Music Playback Service">
+            <intent-filter>
+                <action android:name="android.media.browse.MediaBrowserService" />
+            </intent-filter>
+        </service>
+
+    </application>
+
+</manifest>
diff --git a/kotlin/proguard.flags b/kotlin/proguard.flags
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/kotlin/proguard.flags
diff --git a/res/drawable-hdpi/album_border_large.9.png b/kotlin/res/drawable-hdpi/album_border_large.9.png
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rename from res/drawable-hdpi/album_border_large.9.png
rename to kotlin/res/drawable-hdpi/album_border_large.9.png
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diff --git a/res/drawable-hdpi/albumart_mp_unknown.png b/kotlin/res/drawable-hdpi/albumart_mp_unknown.png
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rename to kotlin/res/drawable-hdpi/albumart_mp_unknown.png
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diff --git a/res/drawable-hdpi/albumart_mp_unknown_list.png b/kotlin/res/drawable-hdpi/albumart_mp_unknown_list.png
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diff --git a/res/drawable-hdpi/app_music.png b/kotlin/res/drawable-hdpi/app_music.png
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rename to kotlin/res/drawable-hdpi/app_music.png
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diff --git a/res/drawable-hdpi/btn_playback_ic_play_small.png b/kotlin/res/drawable-hdpi/btn_playback_ic_play_small.png
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diff --git a/res/drawable-hdpi/btn_playback_small_normal.png b/kotlin/res/drawable-hdpi/btn_playback_small_normal.png
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diff --git a/res/drawable-hdpi/btn_playback_small_selected.png b/kotlin/res/drawable-hdpi/btn_playback_small_selected.png
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diff --git a/res/drawable-hdpi/ic_appwidget_music_next.png b/kotlin/res/drawable-hdpi/ic_appwidget_music_next.png
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diff --git a/res/drawable-hdpi/ic_appwidget_music_play.png b/kotlin/res/drawable-hdpi/ic_appwidget_music_play.png
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diff --git a/res/drawable-hdpi/ic_launcher_shortcut_music_playlist.png b/kotlin/res/drawable-hdpi/ic_launcher_shortcut_music_playlist.png
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diff --git a/res/drawable-hdpi/ic_menu_music_library.png b/kotlin/res/drawable-hdpi/ic_menu_music_library.png
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diff --git a/res/drawable-hdpi/ic_mp_playlist_list.png b/kotlin/res/drawable-hdpi/ic_mp_playlist_list.png
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diff --git a/res/values-en-rAU-keysexposed/strings.xml b/kotlin/res/values-en-rAU-keysexposed/strings.xml
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diff --git a/res/values-en-rIN-keysexposed/strings.xml b/kotlin/res/values-en-rIN-keysexposed/strings.xml
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diff --git a/res/values-es-keysexposed/strings.xml b/kotlin/res/values-es-keysexposed/strings.xml
similarity index 100%
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similarity index 100%
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diff --git a/res/values-es-rUS-keysexposed/strings.xml b/kotlin/res/values-es-rUS-keysexposed/strings.xml
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diff --git a/res/values-es/strings.xml b/kotlin/res/values-es/strings.xml
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diff --git a/res/values-et-keysexposed/strings.xml b/kotlin/res/values-et-keysexposed/strings.xml
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diff --git a/res/values-et/strings.xml b/kotlin/res/values-et/strings.xml
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diff --git a/res/values-fa-keysexposed/strings.xml b/kotlin/res/values-fa-keysexposed/strings.xml
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diff --git a/res/values-fi-keysexposed/strings.xml b/kotlin/res/values-fi-keysexposed/strings.xml
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diff --git a/res/values-fr-keysexposed/strings.xml b/kotlin/res/values-fr-keysexposed/strings.xml
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diff --git a/res/values-fr-rCA-keysexposed/strings.xml b/kotlin/res/values-fr-rCA-keysexposed/strings.xml
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similarity index 100%
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diff --git a/res/values-hi-keysexposed/strings.xml b/kotlin/res/values-hi-keysexposed/strings.xml
similarity index 100%
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similarity index 100%
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diff --git a/res/values-hi/strings.xml b/kotlin/res/values-hi/strings.xml
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diff --git a/res/values-hr-keysexposed/strings.xml b/kotlin/res/values-hr-keysexposed/strings.xml
similarity index 100%
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similarity index 100%
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similarity index 100%
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diff --git a/res/values-hu-keysexposed/strings.xml b/kotlin/res/values-hu-keysexposed/strings.xml
similarity index 100%
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diff --git a/res/values-in-keysexposed/strings.xml b/kotlin/res/values-in-keysexposed/strings.xml
similarity index 100%
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similarity index 100%
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diff --git a/res/values-in/strings.xml b/kotlin/res/values-in/strings.xml
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diff --git a/res/values-it-keysexposed/strings.xml b/kotlin/res/values-it-keysexposed/strings.xml
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similarity index 100%
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diff --git a/res/values-it/strings.xml b/kotlin/res/values-it/strings.xml
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diff --git a/res/values-iw-keysexposed/strings.xml b/kotlin/res/values-iw-keysexposed/strings.xml
similarity index 100%
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diff --git a/res/values-ja-keysexposed/strings.xml b/kotlin/res/values-ja-keysexposed/strings.xml
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diff --git a/res/values-keysexposed/strings.xml b/kotlin/res/values-keysexposed/strings.xml
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diff --git a/res/values-ko-keysexposed/strings.xml b/kotlin/res/values-ko-keysexposed/strings.xml
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diff --git a/res/values-lt-keysexposed/strings.xml b/kotlin/res/values-lt-keysexposed/strings.xml
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diff --git a/res/values-lv-keysexposed/strings.xml b/kotlin/res/values-lv-keysexposed/strings.xml
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diff --git a/res/values-ms-keysexposed/strings.xml b/kotlin/res/values-ms-keysexposed/strings.xml
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diff --git a/res/values-nb-keysexposed/strings.xml b/kotlin/res/values-nb-keysexposed/strings.xml
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diff --git a/res/values-nl-keysexposed/strings.xml b/kotlin/res/values-nl-keysexposed/strings.xml
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diff --git a/res/values-pa/strings.xml b/kotlin/res/values-pa/strings.xml
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rename from res/values-pa/strings.xml
rename to kotlin/res/values-pa/strings.xml
diff --git a/res/values-pl-keysexposed/strings.xml b/kotlin/res/values-pl-keysexposed/strings.xml
similarity index 100%
rename from res/values-pl-keysexposed/strings.xml
rename to kotlin/res/values-pl-keysexposed/strings.xml
diff --git a/res/values-pl-keyshidden/strings.xml b/kotlin/res/values-pl-keyshidden/strings.xml
similarity index 100%
rename from res/values-pl-keyshidden/strings.xml
rename to kotlin/res/values-pl-keyshidden/strings.xml
diff --git a/res/values-pl/strings.xml b/kotlin/res/values-pl/strings.xml
similarity index 100%
rename from res/values-pl/strings.xml
rename to kotlin/res/values-pl/strings.xml
diff --git a/res/values-pl/strings2.xml b/kotlin/res/values-pl/strings2.xml
similarity index 100%
rename from res/values-pl/strings2.xml
rename to kotlin/res/values-pl/strings2.xml
diff --git a/res/values-pt-keysexposed/strings.xml b/kotlin/res/values-pt-keysexposed/strings.xml
similarity index 100%
rename from res/values-pt-keysexposed/strings.xml
rename to kotlin/res/values-pt-keysexposed/strings.xml
diff --git a/res/values-pt-keyshidden/strings.xml b/kotlin/res/values-pt-keyshidden/strings.xml
similarity index 100%
rename from res/values-pt-keyshidden/strings.xml
rename to kotlin/res/values-pt-keyshidden/strings.xml
diff --git a/res/values-pt-rPT-keysexposed/strings.xml b/kotlin/res/values-pt-rPT-keysexposed/strings.xml
similarity index 100%
rename from res/values-pt-rPT-keysexposed/strings.xml
rename to kotlin/res/values-pt-rPT-keysexposed/strings.xml
diff --git a/res/values-pt-rPT-keyshidden/strings.xml b/kotlin/res/values-pt-rPT-keyshidden/strings.xml
similarity index 100%
rename from res/values-pt-rPT-keyshidden/strings.xml
rename to kotlin/res/values-pt-rPT-keyshidden/strings.xml
diff --git a/res/values-pt-rPT/strings.xml b/kotlin/res/values-pt-rPT/strings.xml
similarity index 100%
rename from res/values-pt-rPT/strings.xml
rename to kotlin/res/values-pt-rPT/strings.xml
diff --git a/res/values-pt-rPT/strings2.xml b/kotlin/res/values-pt-rPT/strings2.xml
similarity index 100%
rename from res/values-pt-rPT/strings2.xml
rename to kotlin/res/values-pt-rPT/strings2.xml
diff --git a/res/values-pt/strings.xml b/kotlin/res/values-pt/strings.xml
similarity index 100%
rename from res/values-pt/strings.xml
rename to kotlin/res/values-pt/strings.xml
diff --git a/res/values-pt/strings2.xml b/kotlin/res/values-pt/strings2.xml
similarity index 100%
rename from res/values-pt/strings2.xml
rename to kotlin/res/values-pt/strings2.xml
diff --git a/res/values-rm-keysexposed/strings.xml b/kotlin/res/values-rm-keysexposed/strings.xml
similarity index 100%
rename from res/values-rm-keysexposed/strings.xml
rename to kotlin/res/values-rm-keysexposed/strings.xml
diff --git a/res/values-rm-keyshidden/strings.xml b/kotlin/res/values-rm-keyshidden/strings.xml
similarity index 100%
rename from res/values-rm-keyshidden/strings.xml
rename to kotlin/res/values-rm-keyshidden/strings.xml
diff --git a/res/values-ro-keysexposed/strings.xml b/kotlin/res/values-ro-keysexposed/strings.xml
similarity index 100%
rename from res/values-ro-keysexposed/strings.xml
rename to kotlin/res/values-ro-keysexposed/strings.xml
diff --git a/res/values-ro-keyshidden/strings.xml b/kotlin/res/values-ro-keyshidden/strings.xml
similarity index 100%
rename from res/values-ro-keyshidden/strings.xml
rename to kotlin/res/values-ro-keyshidden/strings.xml
diff --git a/res/values-ro/strings.xml b/kotlin/res/values-ro/strings.xml
similarity index 100%
rename from res/values-ro/strings.xml
rename to kotlin/res/values-ro/strings.xml
diff --git a/res/values-ro/strings2.xml b/kotlin/res/values-ro/strings2.xml
similarity index 100%
rename from res/values-ro/strings2.xml
rename to kotlin/res/values-ro/strings2.xml
diff --git a/res/values-ru-keysexposed/strings.xml b/kotlin/res/values-ru-keysexposed/strings.xml
similarity index 100%
rename from res/values-ru-keysexposed/strings.xml
rename to kotlin/res/values-ru-keysexposed/strings.xml
diff --git a/res/values-ru-keyshidden/strings.xml b/kotlin/res/values-ru-keyshidden/strings.xml
similarity index 100%
rename from res/values-ru-keyshidden/strings.xml
rename to kotlin/res/values-ru-keyshidden/strings.xml
diff --git a/res/values-ru/strings.xml b/kotlin/res/values-ru/strings.xml
similarity index 100%
rename from res/values-ru/strings.xml
rename to kotlin/res/values-ru/strings.xml
diff --git a/res/values-ru/strings2.xml b/kotlin/res/values-ru/strings2.xml
similarity index 100%
rename from res/values-ru/strings2.xml
rename to kotlin/res/values-ru/strings2.xml
diff --git a/res/values-sk-keysexposed/strings.xml b/kotlin/res/values-sk-keysexposed/strings.xml
similarity index 100%
rename from res/values-sk-keysexposed/strings.xml
rename to kotlin/res/values-sk-keysexposed/strings.xml
diff --git a/res/values-sk-keyshidden/strings.xml b/kotlin/res/values-sk-keyshidden/strings.xml
similarity index 100%
rename from res/values-sk-keyshidden/strings.xml
rename to kotlin/res/values-sk-keyshidden/strings.xml
diff --git a/res/values-sk/strings.xml b/kotlin/res/values-sk/strings.xml
similarity index 100%
rename from res/values-sk/strings.xml
rename to kotlin/res/values-sk/strings.xml
diff --git a/res/values-sk/strings2.xml b/kotlin/res/values-sk/strings2.xml
similarity index 100%
rename from res/values-sk/strings2.xml
rename to kotlin/res/values-sk/strings2.xml
diff --git a/res/values-sl-keysexposed/strings.xml b/kotlin/res/values-sl-keysexposed/strings.xml
similarity index 100%
rename from res/values-sl-keysexposed/strings.xml
rename to kotlin/res/values-sl-keysexposed/strings.xml
diff --git a/res/values-sl-keyshidden/strings.xml b/kotlin/res/values-sl-keyshidden/strings.xml
similarity index 100%
rename from res/values-sl-keyshidden/strings.xml
rename to kotlin/res/values-sl-keyshidden/strings.xml
diff --git a/res/values-sl/strings.xml b/kotlin/res/values-sl/strings.xml
similarity index 100%
rename from res/values-sl/strings.xml
rename to kotlin/res/values-sl/strings.xml
diff --git a/res/values-sl/strings2.xml b/kotlin/res/values-sl/strings2.xml
similarity index 100%
rename from res/values-sl/strings2.xml
rename to kotlin/res/values-sl/strings2.xml
diff --git a/res/values-sr-keysexposed/strings.xml b/kotlin/res/values-sr-keysexposed/strings.xml
similarity index 100%
rename from res/values-sr-keysexposed/strings.xml
rename to kotlin/res/values-sr-keysexposed/strings.xml
diff --git a/res/values-sr-keyshidden/strings.xml b/kotlin/res/values-sr-keyshidden/strings.xml
similarity index 100%
rename from res/values-sr-keyshidden/strings.xml
rename to kotlin/res/values-sr-keyshidden/strings.xml
diff --git a/res/values-sr/strings.xml b/kotlin/res/values-sr/strings.xml
similarity index 100%
rename from res/values-sr/strings.xml
rename to kotlin/res/values-sr/strings.xml
diff --git a/res/values-sr/strings2.xml b/kotlin/res/values-sr/strings2.xml
similarity index 100%
rename from res/values-sr/strings2.xml
rename to kotlin/res/values-sr/strings2.xml
diff --git a/res/values-sv-keysexposed/strings.xml b/kotlin/res/values-sv-keysexposed/strings.xml
similarity index 100%
rename from res/values-sv-keysexposed/strings.xml
rename to kotlin/res/values-sv-keysexposed/strings.xml
diff --git a/res/values-sv-keyshidden/strings.xml b/kotlin/res/values-sv-keyshidden/strings.xml
similarity index 100%
rename from res/values-sv-keyshidden/strings.xml
rename to kotlin/res/values-sv-keyshidden/strings.xml
diff --git a/res/values-sv/strings.xml b/kotlin/res/values-sv/strings.xml
similarity index 100%
rename from res/values-sv/strings.xml
rename to kotlin/res/values-sv/strings.xml
diff --git a/res/values-sv/strings2.xml b/kotlin/res/values-sv/strings2.xml
similarity index 100%
rename from res/values-sv/strings2.xml
rename to kotlin/res/values-sv/strings2.xml
diff --git a/res/values-sw-keysexposed/strings.xml b/kotlin/res/values-sw-keysexposed/strings.xml
similarity index 100%
rename from res/values-sw-keysexposed/strings.xml
rename to kotlin/res/values-sw-keysexposed/strings.xml
diff --git a/res/values-sw-keyshidden/strings.xml b/kotlin/res/values-sw-keyshidden/strings.xml
similarity index 100%
rename from res/values-sw-keyshidden/strings.xml
rename to kotlin/res/values-sw-keyshidden/strings.xml
diff --git a/res/values-sw/strings.xml b/kotlin/res/values-sw/strings.xml
similarity index 100%
rename from res/values-sw/strings.xml
rename to kotlin/res/values-sw/strings.xml
diff --git a/res/values-sw/strings2.xml b/kotlin/res/values-sw/strings2.xml
similarity index 100%
rename from res/values-sw/strings2.xml
rename to kotlin/res/values-sw/strings2.xml
diff --git a/res/values-th-keysexposed/strings.xml b/kotlin/res/values-th-keysexposed/strings.xml
similarity index 100%
rename from res/values-th-keysexposed/strings.xml
rename to kotlin/res/values-th-keysexposed/strings.xml
diff --git a/res/values-th-keyshidden/strings.xml b/kotlin/res/values-th-keyshidden/strings.xml
similarity index 100%
rename from res/values-th-keyshidden/strings.xml
rename to kotlin/res/values-th-keyshidden/strings.xml
diff --git a/res/values-th/strings.xml b/kotlin/res/values-th/strings.xml
similarity index 100%
rename from res/values-th/strings.xml
rename to kotlin/res/values-th/strings.xml
diff --git a/res/values-th/strings2.xml b/kotlin/res/values-th/strings2.xml
similarity index 100%
rename from res/values-th/strings2.xml
rename to kotlin/res/values-th/strings2.xml
diff --git a/res/values-tl-keysexposed/strings.xml b/kotlin/res/values-tl-keysexposed/strings.xml
similarity index 100%
rename from res/values-tl-keysexposed/strings.xml
rename to kotlin/res/values-tl-keysexposed/strings.xml
diff --git a/res/values-tl-keyshidden/strings.xml b/kotlin/res/values-tl-keyshidden/strings.xml
similarity index 100%
rename from res/values-tl-keyshidden/strings.xml
rename to kotlin/res/values-tl-keyshidden/strings.xml
diff --git a/res/values-tl/strings.xml b/kotlin/res/values-tl/strings.xml
similarity index 100%
rename from res/values-tl/strings.xml
rename to kotlin/res/values-tl/strings.xml
diff --git a/res/values-tl/strings2.xml b/kotlin/res/values-tl/strings2.xml
similarity index 100%
rename from res/values-tl/strings2.xml
rename to kotlin/res/values-tl/strings2.xml
diff --git a/res/values-tr-keysexposed/strings.xml b/kotlin/res/values-tr-keysexposed/strings.xml
similarity index 100%
rename from res/values-tr-keysexposed/strings.xml
rename to kotlin/res/values-tr-keysexposed/strings.xml
diff --git a/res/values-tr-keyshidden/strings.xml b/kotlin/res/values-tr-keyshidden/strings.xml
similarity index 100%
rename from res/values-tr-keyshidden/strings.xml
rename to kotlin/res/values-tr-keyshidden/strings.xml
diff --git a/res/values-tr/strings.xml b/kotlin/res/values-tr/strings.xml
similarity index 100%
rename from res/values-tr/strings.xml
rename to kotlin/res/values-tr/strings.xml
diff --git a/res/values-tr/strings2.xml b/kotlin/res/values-tr/strings2.xml
similarity index 100%
rename from res/values-tr/strings2.xml
rename to kotlin/res/values-tr/strings2.xml
diff --git a/res/values-uk-keysexposed/strings.xml b/kotlin/res/values-uk-keysexposed/strings.xml
similarity index 100%
rename from res/values-uk-keysexposed/strings.xml
rename to kotlin/res/values-uk-keysexposed/strings.xml
diff --git a/res/values-uk-keyshidden/strings.xml b/kotlin/res/values-uk-keyshidden/strings.xml
similarity index 100%
rename from res/values-uk-keyshidden/strings.xml
rename to kotlin/res/values-uk-keyshidden/strings.xml
diff --git a/res/values-uk/strings.xml b/kotlin/res/values-uk/strings.xml
similarity index 100%
rename from res/values-uk/strings.xml
rename to kotlin/res/values-uk/strings.xml
diff --git a/res/values-uk/strings2.xml b/kotlin/res/values-uk/strings2.xml
similarity index 100%
rename from res/values-uk/strings2.xml
rename to kotlin/res/values-uk/strings2.xml
diff --git a/res/values-vi-keysexposed/strings.xml b/kotlin/res/values-vi-keysexposed/strings.xml
similarity index 100%
rename from res/values-vi-keysexposed/strings.xml
rename to kotlin/res/values-vi-keysexposed/strings.xml
diff --git a/res/values-vi-keyshidden/strings.xml b/kotlin/res/values-vi-keyshidden/strings.xml
similarity index 100%
rename from res/values-vi-keyshidden/strings.xml
rename to kotlin/res/values-vi-keyshidden/strings.xml
diff --git a/res/values-vi/strings.xml b/kotlin/res/values-vi/strings.xml
similarity index 100%
rename from res/values-vi/strings.xml
rename to kotlin/res/values-vi/strings.xml
diff --git a/res/values-vi/strings2.xml b/kotlin/res/values-vi/strings2.xml
similarity index 100%
rename from res/values-vi/strings2.xml
rename to kotlin/res/values-vi/strings2.xml
diff --git a/res/values-zh-rCN-keysexposed/strings.xml b/kotlin/res/values-zh-rCN-keysexposed/strings.xml
similarity index 100%
rename from res/values-zh-rCN-keysexposed/strings.xml
rename to kotlin/res/values-zh-rCN-keysexposed/strings.xml
diff --git a/res/values-zh-rCN-keyshidden/strings.xml b/kotlin/res/values-zh-rCN-keyshidden/strings.xml
similarity index 100%
rename from res/values-zh-rCN-keyshidden/strings.xml
rename to kotlin/res/values-zh-rCN-keyshidden/strings.xml
diff --git a/res/values-zh-rCN/strings.xml b/kotlin/res/values-zh-rCN/strings.xml
similarity index 100%
rename from res/values-zh-rCN/strings.xml
rename to kotlin/res/values-zh-rCN/strings.xml
diff --git a/res/values-zh-rCN/strings2.xml b/kotlin/res/values-zh-rCN/strings2.xml
similarity index 100%
rename from res/values-zh-rCN/strings2.xml
rename to kotlin/res/values-zh-rCN/strings2.xml
diff --git a/res/values-zh-rHK-keysexposed/strings.xml b/kotlin/res/values-zh-rHK-keysexposed/strings.xml
similarity index 100%
rename from res/values-zh-rHK-keysexposed/strings.xml
rename to kotlin/res/values-zh-rHK-keysexposed/strings.xml
diff --git a/res/values-zh-rHK-keyshidden/strings.xml b/kotlin/res/values-zh-rHK-keyshidden/strings.xml
similarity index 100%
rename from res/values-zh-rHK-keyshidden/strings.xml
rename to kotlin/res/values-zh-rHK-keyshidden/strings.xml
diff --git a/res/values-zh-rHK/strings.xml b/kotlin/res/values-zh-rHK/strings.xml
similarity index 100%
rename from res/values-zh-rHK/strings.xml
rename to kotlin/res/values-zh-rHK/strings.xml
diff --git a/res/values-zh-rHK/strings2.xml b/kotlin/res/values-zh-rHK/strings2.xml
similarity index 100%
rename from res/values-zh-rHK/strings2.xml
rename to kotlin/res/values-zh-rHK/strings2.xml
diff --git a/res/values-zh-rTW-keysexposed/strings.xml b/kotlin/res/values-zh-rTW-keysexposed/strings.xml
similarity index 100%
rename from res/values-zh-rTW-keysexposed/strings.xml
rename to kotlin/res/values-zh-rTW-keysexposed/strings.xml
diff --git a/res/values-zh-rTW-keyshidden/strings.xml b/kotlin/res/values-zh-rTW-keyshidden/strings.xml
similarity index 100%
rename from res/values-zh-rTW-keyshidden/strings.xml
rename to kotlin/res/values-zh-rTW-keyshidden/strings.xml
diff --git a/res/values-zh-rTW/strings.xml b/kotlin/res/values-zh-rTW/strings.xml
similarity index 100%
rename from res/values-zh-rTW/strings.xml
rename to kotlin/res/values-zh-rTW/strings.xml
diff --git a/res/values-zh-rTW/strings2.xml b/kotlin/res/values-zh-rTW/strings2.xml
similarity index 100%
rename from res/values-zh-rTW/strings2.xml
rename to kotlin/res/values-zh-rTW/strings2.xml
diff --git a/res/values-zu-keysexposed/strings.xml b/kotlin/res/values-zu-keysexposed/strings.xml
similarity index 100%
rename from res/values-zu-keysexposed/strings.xml
rename to kotlin/res/values-zu-keysexposed/strings.xml
diff --git a/res/values-zu-keyshidden/strings.xml b/kotlin/res/values-zu-keyshidden/strings.xml
similarity index 100%
rename from res/values-zu-keyshidden/strings.xml
rename to kotlin/res/values-zu-keyshidden/strings.xml
diff --git a/res/values-zu/strings.xml b/kotlin/res/values-zu/strings.xml
similarity index 100%
rename from res/values-zu/strings.xml
rename to kotlin/res/values-zu/strings.xml
diff --git a/res/values-zu/strings2.xml b/kotlin/res/values-zu/strings2.xml
similarity index 100%
rename from res/values-zu/strings2.xml
rename to kotlin/res/values-zu/strings2.xml
diff --git a/res/values/colors.xml b/kotlin/res/values/colors.xml
similarity index 100%
rename from res/values/colors.xml
rename to kotlin/res/values/colors.xml
diff --git a/res/values/dimens.xml b/kotlin/res/values/dimens.xml
similarity index 100%
rename from res/values/dimens.xml
rename to kotlin/res/values/dimens.xml
diff --git a/res/values/strings.xml b/kotlin/res/values/strings.xml
similarity index 100%
rename from res/values/strings.xml
rename to kotlin/res/values/strings.xml
diff --git a/res/values/strings2.xml b/kotlin/res/values/strings2.xml
similarity index 100%
rename from res/values/strings2.xml
rename to kotlin/res/values/strings2.xml
diff --git a/kotlin/src/com/android/music/AudioPreview.kt b/kotlin/src/com/android/music/AudioPreview.kt
new file mode 100644
index 0000000..e883b23
--- /dev/null
+++ b/kotlin/src/com/android/music/AudioPreview.kt
@@ -0,0 +1,449 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.music
+
+import android.app.Activity
+import android.content.AsyncQueryHandler
+import android.content.ContentResolver
+import android.content.Context
+import android.content.Intent
+import android.database.Cursor
+import android.media.AudioManager
+import android.media.AudioManager.OnAudioFocusChangeListener
+import android.media.MediaPlayer
+import android.media.MediaPlayer.OnCompletionListener
+import android.media.MediaPlayer.OnErrorListener
+import android.media.MediaPlayer.OnPreparedListener
+import android.net.Uri
+import android.os.Bundle
+import android.os.Handler
+import android.provider.MediaStore
+import android.provider.OpenableColumns
+import android.text.TextUtils
+import android.util.Log
+import android.view.KeyEvent
+import android.view.Menu
+import android.view.MenuItem
+import android.view.View
+import android.view.Window
+import android.view.WindowManager
+import android.widget.ImageButton
+import android.widget.ProgressBar
+import android.widget.SeekBar
+import android.widget.SeekBar.OnSeekBarChangeListener
+import android.widget.TextView
+import android.widget.Toast
+import java.io.IOException
+
+/**
+ * Dialog that comes up in response to various music-related VIEW intents.
+ */
+class AudioPreview : Activity(), OnPreparedListener, OnErrorListener, OnCompletionListener {
+    private lateinit var mTextLine1: TextView
+    private lateinit var mTextLine2: TextView
+    private lateinit var mLoadingText: TextView
+    private lateinit var mSeekBar: SeekBar
+    private lateinit var mAudioManager: AudioManager
+
+    private var mPlayer: PreviewPlayer? = null
+    private var mSeeking = false
+    private var mUiPaused = true
+    private var mDuration = 0
+    private var mUri: Uri? = null
+    private var mMediaId: Long = -1
+    private var mPausedByTransientLossOfFocus = false
+
+    private val mProgressRefresher = Handler()
+
+    override fun onCreate(icicle: Bundle?) {
+        super.onCreate(icicle)
+        val intent: Intent? = getIntent()
+        if (intent == null) {
+            finish()
+            return
+        }
+        mUri = intent.getData()
+        if (mUri == null) {
+            finish()
+            return
+        }
+        val scheme: String? = mUri?.getScheme()
+        setVolumeControlStream(AudioManager.STREAM_MUSIC)
+        requestWindowFeature(Window.FEATURE_NO_TITLE)
+        setContentView(R.layout.audiopreview)
+        mTextLine1 = findViewById(R.id.line1) as TextView
+        mTextLine2 = findViewById(R.id.line2) as TextView
+        mLoadingText = findViewById(R.id.loading) as TextView
+        if (scheme == "http") {
+            val msg: String = getString(R.string.streamloadingtext, mUri!!.getHost())
+            mLoadingText.setText(msg)
+        } else {
+            mLoadingText.setVisibility(View.GONE)
+        }
+        mSeekBar = findViewById(R.id.progress) as SeekBar
+        mAudioManager = getSystemService(Context.AUDIO_SERVICE) as AudioManager
+        val player = getLastNonConfigurationInstance() as PreviewPlayer?
+        if (player == null) {
+            mPlayer = PreviewPlayer()
+            mPlayer!!.setActivity(this)
+            try {
+                mPlayer!!.setDataSourceAndPrepare(mUri!!)
+            } catch (ex: Exception) {
+                // catch generic Exception, since we may be called with a media
+                // content URI, another content provider's URI, a file URI,
+                // an http URI, and there are different exceptions associated
+                // with failure to open each of those.
+                Log.d(TAG, "Failed to open file: $ex")
+                Toast.makeText(this, R.string.playback_failed, Toast.LENGTH_SHORT).show()
+                finish()
+                return
+            }
+        } else {
+            mPlayer = player
+            mPlayer!!.setActivity(this)
+            // onResume will update the UI
+        }
+        val mAsyncQueryHandler: AsyncQueryHandler = object : AsyncQueryHandler(getContentResolver()) {
+            protected override fun onQueryComplete(token: Int, cookie: Any?, cursor: Cursor?) {
+                if (cursor != null && cursor.moveToFirst()) {
+                    val titleIdx: Int = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE)
+                    val artistIdx: Int = cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST)
+                    val idIdx: Int = cursor.getColumnIndex(MediaStore.Audio.Media._ID)
+                    val displaynameIdx: Int = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME)
+                    if (idIdx >= 0) {
+                        mMediaId = cursor.getLong(idIdx)
+                    }
+                    if (titleIdx >= 0) {
+                        val title: String = cursor.getString(titleIdx)
+                        mTextLine1.setText(title)
+                        if (artistIdx >= 0) {
+                            val artist: String = cursor.getString(artistIdx)
+                            mTextLine2.setText(artist)
+                        }
+                    } else if (displaynameIdx >= 0) {
+                        val name: String = cursor.getString(displaynameIdx)
+                        mTextLine1.setText(name)
+                    } else {
+                        // Couldn't find anything to display, what to do now?
+                        Log.w(TAG, "Cursor had no names for us")
+                    }
+                } else {
+                    Log.w(TAG, "empty cursor")
+                }
+                cursor?.let {
+                    it.close()
+                }
+                setNames()
+            }
+        }
+        if (scheme == ContentResolver.SCHEME_CONTENT) {
+            if (mUri!!.getAuthority() === MediaStore.AUTHORITY) {
+                // try to get title and artist from the media content provider
+                mAsyncQueryHandler.startQuery(0, null, mUri, arrayOf<String>(MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.ARTIST),
+                        null, null, null)
+            } else {
+                // Try to get the display name from another content provider.
+                // Don't specifically ask for the display name though, since the
+                // provider might not actually support that column.
+                mAsyncQueryHandler.startQuery(0, null, mUri, null, null, null, null)
+            }
+        } else if (scheme == "file") {
+            // check if this file is in the media database (clicking on a download
+            // in the download manager might follow this path
+            val path: String? = mUri?.getPath()
+            mAsyncQueryHandler.startQuery(0, null, MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, arrayOf<String>(MediaStore.Audio.Media._ID, MediaStore.Audio.Media.TITLE,
+                    MediaStore.Audio.Media.ARTIST), MediaStore.Audio.Media.DATA.toString() + "=?", arrayOf(path), null)
+        } else {
+            // We can't get metadata from the file/stream itself yet, because
+            // that API is hidden, so instead we display the URI being played
+            if (mPlayer!!.isPrepared) {
+                setNames()
+            }
+        }
+    }
+
+    override fun onPause() {
+        super.onPause()
+        mUiPaused = true
+        mProgressRefresher.removeCallbacksAndMessages(null)
+    }
+
+    override fun onResume() {
+        super.onResume()
+        mUiPaused = false
+        if (mPlayer!!.isPrepared) {
+            showPostPrepareUI()
+        }
+    }
+
+    override fun onRetainNonConfigurationInstance(): Any? {
+        val player = mPlayer
+        mPlayer = null
+        return player
+    }
+
+    override fun onDestroy() {
+        stopPlayback()
+        super.onDestroy()
+    }
+
+    private fun stopPlayback() {
+        mProgressRefresher.removeCallbacksAndMessages(null)
+        if (mPlayer != null) {
+            mPlayer?.release()
+            mPlayer = null
+            mAudioManager.abandonAudioFocus(mAudioFocusListener)
+        }
+    }
+
+    override fun onUserLeaveHint() {
+        stopPlayback()
+        finish()
+        super.onUserLeaveHint()
+    }
+
+    override fun onPrepared(mp: MediaPlayer?) {
+        if (isFinishing()) return
+        mPlayer = mp as PreviewPlayer
+        setNames()
+        mPlayer?.start()
+        showPostPrepareUI()
+    }
+
+    private fun showPostPrepareUI() {
+        val pb: ProgressBar = findViewById(R.id.spinner) as ProgressBar
+        pb.setVisibility(View.GONE)
+        mDuration = mPlayer!!.getDuration()
+        if (mDuration != 0) {
+            mSeekBar.setMax(mDuration)
+            mSeekBar.setVisibility(View.VISIBLE)
+            if (!mSeeking) {
+                mSeekBar.setProgress(mPlayer!!.getCurrentPosition())
+            }
+        }
+        mSeekBar.setOnSeekBarChangeListener(mSeekListener)
+        mLoadingText.setVisibility(View.GONE)
+        val v: View = findViewById(R.id.titleandbuttons)
+        v.setVisibility(View.VISIBLE)
+        mAudioManager.requestAudioFocus(mAudioFocusListener, AudioManager.STREAM_MUSIC,
+                AudioManager.AUDIOFOCUS_GAIN_TRANSIENT)
+        mProgressRefresher.removeCallbacksAndMessages(null)
+        mProgressRefresher.postDelayed(ProgressRefresher(), 200)
+        updatePlayPause()
+    }
+
+    private val mAudioFocusListener: OnAudioFocusChangeListener = object : OnAudioFocusChangeListener {
+        override fun onAudioFocusChange(focusChange: Int) {
+            if (mPlayer == null) {
+                // this activity has handed its MediaPlayer off to the next activity
+                // (e.g. portrait/landscape switch) and should abandon its focus
+                mAudioManager.abandonAudioFocus(this)
+                return
+            }
+            when (focusChange) {
+                AudioManager.AUDIOFOCUS_LOSS -> {
+                    mPausedByTransientLossOfFocus = false
+                    mPlayer?.pause()
+                }
+                AudioManager.AUDIOFOCUS_LOSS_TRANSIENT, AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK -> if (mPlayer!!.isPlaying()) {
+                    mPausedByTransientLossOfFocus = true
+                    mPlayer?.pause()
+                }
+                AudioManager.AUDIOFOCUS_GAIN -> if (mPausedByTransientLossOfFocus) {
+                    mPausedByTransientLossOfFocus = false
+                    start()
+                }
+            }
+            updatePlayPause()
+        }
+    }
+
+    private fun start() {
+        mAudioManager.requestAudioFocus(mAudioFocusListener, AudioManager.STREAM_MUSIC,
+                AudioManager.AUDIOFOCUS_GAIN_TRANSIENT)
+        mPlayer?.start()
+        mProgressRefresher.postDelayed(ProgressRefresher(), 200)
+    }
+
+    private fun setNames() {
+        if (TextUtils.isEmpty(mTextLine1.getText())) {
+            mTextLine1.setText(mUri!!.getLastPathSegment())
+        }
+        if (TextUtils.isEmpty(mTextLine2.getText())) {
+            mTextLine2.setVisibility(View.GONE)
+        } else {
+            mTextLine2.setVisibility(View.VISIBLE)
+        }
+    }
+
+    internal inner class ProgressRefresher : Runnable {
+        override fun run() {
+            if (mPlayer != null && !mSeeking && mDuration != 0) {
+                mSeekBar.setProgress(mPlayer!!.getCurrentPosition())
+            }
+            mProgressRefresher.removeCallbacksAndMessages(null)
+            if (!mUiPaused) {
+                mProgressRefresher.postDelayed(ProgressRefresher(), 200)
+            }
+        }
+    }
+
+    private fun updatePlayPause() {
+        val b: ImageButton? = findViewById(R.id.playpause) as ImageButton?
+        if (b != null && mPlayer != null) {
+            if (mPlayer!!.isPlaying()) {
+                b.setImageResource(R.drawable.btn_playback_ic_pause_small)
+            } else {
+                b.setImageResource(R.drawable.btn_playback_ic_play_small)
+                mProgressRefresher.removeCallbacksAndMessages(null)
+            }
+        }
+    }
+
+    private val mSeekListener: OnSeekBarChangeListener = object : OnSeekBarChangeListener {
+        override fun onStartTrackingTouch(bar: SeekBar?) {
+            mSeeking = true
+        }
+
+        override fun onProgressChanged(bar: SeekBar?, progress: Int, fromuser: Boolean) {
+            if (!fromuser) {
+                return
+            }
+            // Protection for case of simultaneously tapping on seek bar and exit
+            mPlayer?.let{
+                it.seekTo(progress)
+            }
+        }
+
+        override fun onStopTrackingTouch(bar: SeekBar?) {
+            mSeeking = false
+        }
+    }
+
+    override fun onError(mp: MediaPlayer?, what: Int, extra: Int): Boolean {
+        Toast.makeText(this, R.string.playback_failed, Toast.LENGTH_SHORT).show()
+        finish()
+        return true
+    }
+
+    override fun onCompletion(mp: MediaPlayer?) {
+        mSeekBar.setProgress(mDuration)
+        updatePlayPause()
+    }
+
+    fun playPauseClicked(v: View?) {
+        // Protection for case of simultaneously tapping on play/pause and exit
+        mPlayer?.let {
+            if (it.isPlaying()) {
+                it.pause()
+            } else {
+                start()
+            }
+            updatePlayPause()
+        }
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
+        super.onCreateOptionsMenu(menu)
+        // TODO: if mMediaId != -1, then the playing file has an entry in the media
+        // database, and we could open it in the full music app instead.
+        // Ideally, we would hand off the currently running mediaplayer
+        // to the music UI, which can probably be done via a public static
+        menu.add(0, OPEN_IN_MUSIC, 0, "open in music")
+        return true
+    }
+
+    override fun onPrepareOptionsMenu(menu: Menu): Boolean {
+        val item: MenuItem = menu.findItem(OPEN_IN_MUSIC)
+        if (mMediaId >= 0) {
+            item.setVisible(true)
+            return true
+        }
+        item.setVisible(false)
+        return false
+    }
+
+    override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
+        when (keyCode) {
+            KeyEvent.KEYCODE_HEADSETHOOK, KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE -> {
+                if (mPlayer!!.isPlaying()) {
+                    mPlayer?.pause()
+                } else {
+                    start()
+                }
+                updatePlayPause()
+                return true
+            }
+            KeyEvent.KEYCODE_MEDIA_PLAY -> {
+                start()
+                updatePlayPause()
+                return true
+            }
+            KeyEvent.KEYCODE_MEDIA_PAUSE -> {
+                if (mPlayer!!.isPlaying()) {
+                    mPlayer?.pause()
+                }
+                updatePlayPause()
+                return true
+            }
+            KeyEvent.KEYCODE_MEDIA_FAST_FORWARD,
+            KeyEvent.KEYCODE_MEDIA_NEXT,
+            KeyEvent.KEYCODE_MEDIA_PREVIOUS,
+            KeyEvent.KEYCODE_MEDIA_REWIND -> return true
+            KeyEvent.KEYCODE_MEDIA_STOP, KeyEvent.KEYCODE_BACK -> {
+                stopPlayback()
+                finish()
+                return true
+            }
+            else -> return super.onKeyDown(keyCode, event)
+        }
+    }
+
+    /*
+     * Wrapper class to help with handing off the MediaPlayer to the next instance
+     * of the activity in case of orientation change, without losing any state.
+     */
+    private class PreviewPlayer : MediaPlayer(), OnPreparedListener {
+        private lateinit var mActivity: AudioPreview
+        var isPrepared = false
+
+        fun setActivity(activity: AudioPreview) {
+            mActivity = activity
+            setOnPreparedListener(this)
+            setOnErrorListener(mActivity)
+            setOnCompletionListener(mActivity)
+        }
+
+        @Throws(IllegalArgumentException::class, SecurityException::class, IllegalStateException::class, IOException::class)
+        fun setDataSourceAndPrepare(uri: Uri) {
+            setDataSource(mActivity, uri)
+            prepareAsync()
+        }
+
+        /* (non-Javadoc)
+         * @see android.media.MediaPlayer.OnPreparedListener#onPrepared(android.media.MediaPlayer)
+         */
+        override fun onPrepared(mp: MediaPlayer?) {
+            isPrepared = true
+            mActivity.onPrepared(mp)
+        }
+    }
+
+    companion object {
+        private const val TAG = "AudioPreview"
+        private const val OPEN_IN_MUSIC = 1
+    }
+}
\ No newline at end of file
diff --git a/kotlin/src/com/android/music/MediaPlaybackService.kt b/kotlin/src/com/android/music/MediaPlaybackService.kt
new file mode 100644
index 0000000..c7df9ec
--- /dev/null
+++ b/kotlin/src/com/android/music/MediaPlaybackService.kt
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.music
+
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import android.media.browse.MediaBrowser.MediaItem
+import android.media.session.MediaSession
+import android.media.session.PlaybackState
+import android.os.Bundle
+import android.service.media.MediaBrowserService
+import android.util.Log
+
+/**
+ * Provides "background" audio playback capabilities, allowing the
+ * user to switch between activities without stopping playback.
+ */
+class MediaPlaybackService : MediaBrowserService() {
+
+    private lateinit var mSession: MediaSession
+
+    override fun onCreate() {
+        super.onCreate()
+
+        // Start a new MediaSession
+        mSession = MediaSession(this, "MediaPlaybackService")
+        // Enable callbacks from MediaButtons and TransportControls
+        mSession.setFlags(MediaSession.FLAG_HANDLES_MEDIA_BUTTONS
+                or MediaSession.FLAG_HANDLES_TRANSPORT_CONTROLS)
+        // Set an initial PlaybackState with ACTION_PLAY, so media buttons can start the player
+        val stateBuilder: PlaybackState.Builder = PlaybackState.Builder().setActions(
+                PlaybackState.ACTION_PLAY or PlaybackState.ACTION_PLAY_PAUSE)
+        mSession.setPlaybackState(stateBuilder.build())
+        setSessionToken(mSession.getSessionToken())
+        val context: Context = getApplicationContext()
+        val intent = Intent(context, MusicBrowserActivity::class.java)
+        val pi: PendingIntent = PendingIntent.getActivity(
+                context, 99 /*request code*/, intent, PendingIntent.FLAG_UPDATE_CURRENT)
+        mSession.setSessionActivity(pi)
+    }
+
+    override fun onStartCommand(startIntent: Intent?, flags: Int, startId: Int): Int {
+        return START_STICKY
+    }
+
+    override fun onDestroy() {}
+
+    override fun onGetRoot(clientPackageName: String, clientUid: Int, rootHints: Bundle?): BrowserRoot? {
+        return null
+    }
+
+    override fun onLoadChildren(parentMediaId: String, result: Result<List<MediaItem>>) {
+        result.sendResult(null)
+    }
+
+    private inner class MediaSessionCallback : MediaSession.Callback() {
+        override fun onPlay() {}
+
+        override fun onSkipToQueueItem(queueId: Long) {}
+
+        override fun onSeekTo(position: Long) {}
+
+        override fun onPlayFromMediaId(mediaId: String?, extras: Bundle?) {}
+
+        override fun onPause() {}
+
+        override fun onStop() {}
+
+        override fun onSkipToNext() {}
+
+        override fun onSkipToPrevious() {}
+
+        override fun onPlayFromSearch(query: String?, extras: Bundle?) {}
+
+        override fun onCustomAction(action: String, extras: Bundle?) {}
+    }
+}
\ No newline at end of file
diff --git a/kotlin/src/com/android/music/MusicBrowserActivity.kt b/kotlin/src/com/android/music/MusicBrowserActivity.kt
new file mode 100644
index 0000000..458615c
--- /dev/null
+++ b/kotlin/src/com/android/music/MusicBrowserActivity.kt
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.music
+
+import android.app.Activity
+import android.os.Bundle
+
+/**
+ * A skeleton class that provides empty implementations for Activity class.
+ */
+class MusicBrowserActivity : Activity() {
+    override fun onCreate(icicle: Bundle?) {}
+
+    override fun onDestroy() {}
+
+    override fun onRequestPermissionsResult(
+            requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
+    }
+}
\ No newline at end of file
diff --git a/kotlin/src/com/android/music/MusicPicker.kt b/kotlin/src/com/android/music/MusicPicker.kt
new file mode 100644
index 0000000..8c8b460
--- /dev/null
+++ b/kotlin/src/com/android/music/MusicPicker.kt
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.music
+
+import android.app.ListActivity
+import android.content.Intent
+import android.net.Uri
+import android.os.Bundle
+import android.provider.MediaStore
+import android.util.Log
+import android.view.Menu
+import android.view.MenuItem
+import android.view.View
+import android.widget.ListView
+
+/**
+ * A dummy class to handle android.intent.action.PICK Intent.
+ */
+class MusicPicker : ListActivity(), View.OnClickListener {
+    /** Uri to the directory of all music being displayed.  */
+    var mBaseUri: Uri? = null
+
+    /** Called when the activity is first created.  */
+    override fun onCreate(icicle: Bundle?) {
+        super.onCreate(icicle)
+        mBaseUri = if (Intent.ACTION_GET_CONTENT.equals(getIntent().getAction())) {
+            MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
+        } else {
+            getIntent().getData()
+        }
+        Log.w("MusicPicker", "Doesn't handle for data URI given to PICK action")
+    }
+
+    override fun onRestart() {
+        super.onRestart()
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        return super.onOptionsItemSelected(item)
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
+        super.onCreateOptionsMenu(menu)
+        return true
+    }
+
+    protected override fun onSaveInstanceState(icicle: Bundle) {
+        super.onSaveInstanceState(icicle)
+    }
+
+    override fun onPause() {
+        super.onPause()
+    }
+
+    override fun onStop() {
+        super.onStop()
+    }
+
+    protected override fun onListItemClick(l: ListView?, v: View?, position: Int, id: Long) {}
+
+    override fun onClick(v: View?) {}
+
+    companion object {
+        const val DBG = false
+        const val TAG = "MusicPicker"
+    }
+}
\ No newline at end of file
diff --git a/src/com/android/music/MusicPicker.java b/src/com/android/music/MusicPicker.java
index 3a227cd..b244146 100644
--- a/src/com/android/music/MusicPicker.java
+++ b/src/com/android/music/MusicPicker.java
@@ -17,38 +17,15 @@
 package com.android.music;
 
 import android.app.ListActivity;
-import android.content.AsyncQueryHandler;
-import android.content.ContentUris;
-import android.content.Context;
 import android.content.Intent;
-import android.database.CharArrayBuffer;
-import android.database.Cursor;
-import android.media.AudioManager;
-import android.media.MediaPlayer;
-import android.media.RingtoneManager;
 import android.net.Uri;
 import android.os.Bundle;
-import android.os.Parcelable;
 import android.provider.MediaStore;
-import android.text.TextUtils;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
-import android.view.ViewGroup;
-import android.view.Window;
-import android.view.animation.AnimationUtils;
-import android.widget.ImageView;
 import android.widget.ListView;
-import android.widget.RadioButton;
-import android.widget.SectionIndexer;
-import android.widget.SimpleCursorAdapter;
-import android.widget.TextView;
-
-import java.io.IOException;
-import java.text.Collator;
-import java.util.Formatter;
-import java.util.Locale;
 
 /**
  * A dummy class to handle android.intent.action.PICK Intent.