diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index 6fb7073..f6a413e 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -78,6 +78,7 @@
 
         <activity android:name=".GameActivity"
             android:label="@string/app_name"
+            android:process=":game"
             android:alwaysRetainTaskState="true"
             android:configChanges="layoutDirection|locale|orientation|uiMode|screenLayout|screenSize|smallestScreenSize|keyboard|keyboardHidden|navigation"
             android:theme="@style/AppTheme"
diff --git a/android/app/src/main/java/io/github/kichikuou/xsystem35/GameActivity.kt b/android/app/src/main/java/io/github/kichikuou/xsystem35/GameActivity.kt
index b8f3e86..3c4415d 100644
--- a/android/app/src/main/java/io/github/kichikuou/xsystem35/GameActivity.kt
+++ b/android/app/src/main/java/io/github/kichikuou/xsystem35/GameActivity.kt
@@ -20,6 +20,7 @@ package io.github.kichikuou.xsystem35
 import android.app.AlertDialog
 import android.media.MediaPlayer
 import android.os.Bundle
+import android.os.Process
 import android.text.InputType
 import android.util.Log
 import android.widget.EditText
@@ -56,6 +57,18 @@ class GameActivity : SDLActivity() {
         midi.onActivityResume()
     }
 
+    override fun onDestroy() {
+        try {
+            super.onDestroy()
+        } finally {
+            try {
+                midi.release()
+            } finally {
+                Process.killProcess(Process.myPid())
+            }
+        }
+    }
+
     override fun getLibraries(): Array<String> {
         return arrayOf("SDL2", "xsystem35")
     }
@@ -75,7 +88,6 @@ class GameActivity : SDLActivity() {
                 return
         }
         File(gameRoot, Launcher.TITLE_FILE).writeText(str)
-        Launcher.updateGameList()
     }
 
     private fun textInputDialog(msg: String, oldVal: String, maxLen: Int, result: Array<String?>) {
@@ -154,11 +166,21 @@ class GameActivity : SDLActivity() {
 }
 
 private class MidiPlayer {
+    private enum class State {
+        STOPPED,
+        PLAYING,
+        PAUSED,
+        RELEASED,
+    }
+
     private val player = MediaPlayer()
-    private var playing = false
-    private var playerPaused = false
+    private var state = State.STOPPED
 
     fun start(path: String, loop: Boolean) {
+        if (state == State.RELEASED) {
+            return
+        }
+        state = State.STOPPED
         try {
             player.apply {
                 reset()
@@ -167,7 +189,7 @@ private class MidiPlayer {
                 prepare()
                 start()
             }
-            playing = true
+            state = State.PLAYING
         } catch (e: IOException) {
             Log.e("midiStart", "Cannot play midi", e)
             player.reset()
@@ -175,27 +197,41 @@ private class MidiPlayer {
     }
 
     fun stop() {
-        if (playing && player.isPlaying) {
-            player.stop()
-            playing = false
+        when (state) {
+            State.PLAYING, State.PAUSED -> {
+                player.stop()
+                state = State.STOPPED
+            }
+            State.STOPPED, State.RELEASED -> Unit
         }
     }
 
     fun currentPosition(): Int {
-        return if (playing) player.currentPosition else 0
+        return when (state) {
+            State.PLAYING, State.PAUSED -> player.currentPosition
+            State.STOPPED, State.RELEASED -> 0
+        }
     }
 
     fun onActivityStop() {
-        if (playing && player.isPlaying) {
+        if (state == State.PLAYING && player.isPlaying) {
             player.pause()
-            playerPaused = true
+            state = State.PAUSED
         }
     }
 
     fun onActivityResume() {
-        if (playerPaused) {
+        if (state == State.PAUSED) {
             player.start()
-            playerPaused = false
+            state = State.PLAYING
         }
     }
+
+    fun release() {
+        if (state == State.RELEASED) {
+            return
+        }
+        state = State.RELEASED
+        player.release()
+    }
 }
diff --git a/android/app/src/main/java/io/github/kichikuou/xsystem35/Launcher.kt b/android/app/src/main/java/io/github/kichikuou/xsystem35/Launcher.kt
index e932061..f7887ef 100644
--- a/android/app/src/main/java/io/github/kichikuou/xsystem35/Launcher.kt
+++ b/android/app/src/main/java/io/github/kichikuou/xsystem35/Launcher.kt
@@ -60,9 +60,6 @@ class Launcher private constructor(rootDir: File) {
             return gLauncher!!
         }
 
-        fun updateGameList() {
-            gLauncher?.updateGameList()
-        }
     }
 
     private val store = GameStore(rootDir)
@@ -160,7 +157,7 @@ class Launcher private constructor(rootDir: File) {
         observer?.onGameListChange()
     }
 
-    private fun updateGameList() {
+    fun refreshGameList() {
         store.updateGameList()
         observer?.onGameListChange()
     }
diff --git a/android/app/src/main/java/io/github/kichikuou/xsystem35/LauncherActivity.kt b/android/app/src/main/java/io/github/kichikuou/xsystem35/LauncherActivity.kt
index e55bdc9..71a61bc 100644
--- a/android/app/src/main/java/io/github/kichikuou/xsystem35/LauncherActivity.kt
+++ b/android/app/src/main/java/io/github/kichikuou/xsystem35/LauncherActivity.kt
@@ -68,6 +68,11 @@ class LauncherActivity : Activity(), LauncherObserver {
         super.onDestroy()
     }
 
+    override fun onResume() {
+        super.onResume()
+        launcher.refreshGameList()
+    }
+
     private fun onListItemClick(position: Int) {
         startGame(launcher.games[position].path, null)
     }