snapshot: 存档 flutter create 模板覆盖后的现场，作为多实例修复前的基线

android/app/src/main/kotlin/com/example/qingting_player/MainActivity.kt

@@ -4,14 +4,20 @@ import android.os.Build
 import android.os.Bundle
 import android.util.Log
 import androidx.core.content.FileProvider
-import io.flutter.embedding.android.FlutterActivity
+import com.ryanheise.audioservice.AudioServiceActivity
 import io.flutter.embedding.engine.FlutterEngine
 import io.flutter.plugin.common.MethodChannel
 import java.io.File
 import android.content.Context
 import android.media.AudioManager
 
-class MainActivity : FlutterActivity() {
+// 必须继承 AudioServiceActivity，而不是 FlutterActivity：
+// audio_service 0.18.x 会把 Dart 入口跑在一个单独的缓存引擎（audio_service_engine）里。
+// 若这里用 FlutterActivity，Activity 会自建第二个 FlutterEngine，
+// main() 因此被跑两遍，产生两个 PlaybackService / 两个 media_kit Player（libmpv 多实例），
+// 表现为两路声音、通知栏控制的是另一个实例。
+// AudioServiceActivity 通过 provideFlutterEngine() 复用同一个缓存引擎，保证全局只有一个 Player。
+class MainActivity : AudioServiceActivity() {
 
     private val CHANNEL = "com.lxh.qingting_player/file_provider"
 

android/qingting_player_android.iml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="FacetManager">
+    <facet type="android" name="Android">
+      <configuration>
+        <option name="ALLOW_USER_CONFIGURATION" value="false" />
+        <option name="GEN_FOLDER_RELATIVE_PATH_APT" value="/gen" />
+        <option name="GEN_FOLDER_RELATIVE_PATH_AIDL" value="/gen" />
+        <option name="MANIFEST_FILE_RELATIVE_PATH" value="/app/src/main/AndroidManifest.xml" />
+        <option name="RES_FOLDER_RELATIVE_PATH" value="/app/src/main/res" />
+        <option name="ASSETS_FOLDER_RELATIVE_PATH" value="/app/src/main/assets" />
+        <option name="LIBS_FOLDER_RELATIVE_PATH" value="/app/src/main/libs" />
+        <option name="PROGUARD_LOGS_FOLDER_RELATIVE_PATH" value="/app/src/main/proguard_logs" />
+      </configuration>
+    </facet>
+  </component>
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/app/src/main/java" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/app/src/main/kotlin" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/gen" isTestSource="false" generated="true" />
+    </content>
+    <orderEntry type="jdk" jdkName="Android API 24 Platform" jdkType="Android SDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Flutter for Android" level="project" />
+    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
+  </component>
+</module>

qingting_player.iml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/lib" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/.idea" />
+      <excludeFolder url="file://$MODULE_DIR$/build" />
+    </content>
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Dart SDK" level="project" />
+    <orderEntry type="library" name="Flutter Plugins" level="project" />
+    <orderEntry type="library" name="Dart Packages" level="project" />
+  </component>
+</module>