노란 앱 아이콘 (노랑·검정 두 색) 추가 및 환경 설정에서 앱 아이콘 고르기

- 아이콘 5종: 노랑(기본) · 검정 · 필름+JJ · 필름 · 처음 아이콘(파랑)
- Android: 아이콘마다 activity-alias, 중계 LauncherActivity 로 바꿔도 앱 화면 유지
- Windows: 창 · 작업 표시줄 · 트레이 아이콘, 앱 안 홈 버튼도 고른 아이콘으로

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

android/app/src/main/AndroidManifest.xml

@@ -38,10 +38,7 @@
               android:name="io.flutter.embedding.android.NormalTheme"
               android:resource="@style/NormalTheme"
               />
-            <intent-filter>
-                <action android:name="android.intent.action.MAIN"/>
-                <category android:name="android.intent.category.LAUNCHER"/>
-            </intent-filter>
+            <!-- 앱 목록 · 홈 화면 아이콘은 아래 activity-alias (환경 설정 > 일반 > 앱 아이콘 에서 고른 것 하나만 켬) -->
             <!-- 연결 프로그램: 파일 앱 등에서 동영상 "다음으로 열기" -->
             <intent-filter>
                 <action android:name="android.intent.action.VIEW"/>
@@ -59,6 +56,69 @@
                 <data android:mimeType="video/*"/>
             </intent-filter>
         </activity>
+        <!-- 아이콘이 여는 중계 화면 (MainActivity 를 열고 바로 닫힘: 아이콘을 바꿔도 앱 화면이 닫히지 않게) -->
+        <activity
+            android:name=".LauncherActivity"
+            android:exported="false"
+            android:excludeFromRecents="true"
+            android:noHistory="true"
+            android:theme="@android:style/Theme.Translucent.NoTitleBar" />
+        <!-- 앱 아이콘 (고를 수 있는 것마다 하나, 처음에는 노랑만 켜짐) -->
+        <activity-alias
+            android:name=".IconYellow"
+            android:targetActivity=".LauncherActivity"
+            android:icon="@mipmap/ic_launcher_yellow"
+            android:enabled="true"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity-alias>
+        <activity-alias
+            android:name=".IconBlack"
+            android:targetActivity=".LauncherActivity"
+            android:icon="@mipmap/ic_launcher_black"
+            android:enabled="false"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity-alias>
+        <activity-alias
+            android:name=".IconFilmJj"
+            android:targetActivity=".LauncherActivity"
+            android:icon="@mipmap/ic_launcher_film_jj"
+            android:enabled="false"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity-alias>
+        <activity-alias
+            android:name=".IconFilm"
+            android:targetActivity=".LauncherActivity"
+            android:icon="@mipmap/ic_launcher_film"
+            android:enabled="false"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity-alias>
+        <activity-alias
+            android:name=".IconBlue"
+            android:targetActivity=".LauncherActivity"
+            android:icon="@mipmap/ic_launcher_blue"
+            android:enabled="false"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity-alias>
         <!-- 업데이트 APK 를 설치 화면에 넘기기 위한 파일 공유 (cache/updates 만) -->
         <provider
             android:name="androidx.core.content.FileProvider"

android/app/src/main/kotlin/com/jj/jj_mkvmaker/LauncherActivity.kt

@@ -0,0 +1,19 @@
+package com.jj.jj_mkvmaker
+
+import android.app.Activity
+import android.content.Intent
+import android.os.Bundle
+
+/// 앱 목록 · 홈 화면 아이콘 (activity-alias) 이 여는 중계 화면: MainActivity 를 열고 바로 닫는다.
+/// MainActivity 작업이 alias 로 시작되면 환경 설정에서 아이콘을 바꿀 때 (그 alias 를 끄면) 앱 화면이 닫히므로.
+class LauncherActivity : Activity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        startActivity(Intent(this, MainActivity::class.java).apply {
+            action = Intent.ACTION_MAIN
+            addCategory(Intent.CATEGORY_LAUNCHER)
+            addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+        })
+        finish()
+    }
+}

android/app/src/main/kotlin/com/jj/jj_mkvmaker/MainActivity.kt

@@ -61,6 +61,7 @@ class MainActivity : FlutterActivity() {
                     result.error("INSTALL", e.message ?: e.toString(), null)
                 }
                 "openFolder" -> result.success(openFolder(call.argument<String>("path") ?: ""))
+                "setAppIcon" -> result.success(setAppIcon(call.argument<String>("id") ?: ""))
                 "keepAlive" -> {
                     keepAlive(call.argument<String>("text") ?: "", call.argument<Int>("progress") ?: -1)
                     result.success(null)
@@ -238,6 +239,23 @@ class MainActivity : FlutterActivity() {
     }
 
     /// 폴더를 파일 앱으로 연다 (내장 저장소 안의 폴더만). 열 앱이 없으면 false.
+    /// 앱 아이콘 바꾸기: 고른 아이콘의 activity-alias 만 켜고 나머지는 끈다 (앱은 계속 켜 둔 채로)
+    private fun setAppIcon(id: String): Boolean {
+        val ids = listOf("yellow", "black", "film_jj", "film", "blue")
+        if (id !in ids) return false
+        val pm = packageManager
+        for (i in ids) {
+            val name = "$packageName.Icon" + i.split('_').joinToString("") { it.replaceFirstChar(Char::uppercaseChar) }
+            val state = if (i == id) PackageManager.COMPONENT_ENABLED_STATE_ENABLED
+            else PackageManager.COMPONENT_ENABLED_STATE_DISABLED
+            val cn = android.content.ComponentName(this, name)
+            if (pm.getComponentEnabledSetting(cn) != state) {
+                pm.setComponentEnabledSetting(cn, state, PackageManager.DONT_KILL_APP)
+            }
+        }
+        return true
+    }
+
     private fun openFolder(path: String): Boolean {
         // 내장 저장소 (primary) 또는 SD 카드 · USB (/storage/XXXX-XXXX → 문서 ID "XXXX-XXXX:...")
         val root = Environment.getExternalStorageDirectory().path

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@mipmap/ic_launcher_background"/>
-    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
-    <monochrome android:drawable="@mipmap/ic_launcher_foreground"/>
+    <background android:drawable="@mipmap/ic_launcher_bg"/>
+    <foreground android:drawable="@mipmap/ic_launcher_fg"/>
+    <monochrome android:drawable="@mipmap/ic_launcher_fg"/>
 </adaptive-icon>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_black.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_launcher_black_bg"/>
+    <foreground android:drawable="@mipmap/ic_launcher_black_fg"/>
+    <monochrome android:drawable="@mipmap/ic_launcher_black_fg"/>
+</adaptive-icon>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_blue.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_launcher_blue_bg"/>
+    <foreground android:drawable="@mipmap/ic_launcher_blue_fg"/>
+    <monochrome android:drawable="@mipmap/ic_launcher_blue_fg"/>
+</adaptive-icon>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_film.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_launcher_film_bg"/>
+    <foreground android:drawable="@mipmap/ic_launcher_film_fg"/>
+    <monochrome android:drawable="@mipmap/ic_launcher_film_fg"/>
+</adaptive-icon>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_film_jj.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_launcher_film_jj_bg"/>
+    <foreground android:drawable="@mipmap/ic_launcher_film_jj_fg"/>
+    <monochrome android:drawable="@mipmap/ic_launcher_film_jj_fg"/>
+</adaptive-icon>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_yellow.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_launcher_yellow_bg"/>
+    <foreground android:drawable="@mipmap/ic_launcher_yellow_fg"/>
+    <monochrome android:drawable="@mipmap/ic_launcher_yellow_fg"/>
+</adaptive-icon>