定住这个commit，切换至test分支进行部分破坏性变更：涉及到app内多实例异常问题修复

android/app/src/main/AndroidManifest.xml

@@ -7,6 +7,7 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
 
     <application
         android:name="${applicationName}"

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

@@ -8,6 +8,8 @@ import io.flutter.embedding.android.FlutterActivity
 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() {
 
@@ -32,9 +34,32 @@ class MainActivity : FlutterActivity() {
 
         super.onCreate(savedInstanceState)
 
+        requestAudioFocus()
+
         setHighRefreshRate()
     }
 
+    private fun requestAudioFocus() {
+        val audioManager = getSystemService(Context.AUDIO_SERVICE) as AudioManager
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            audioManager.requestAudioFocus(
+                AudioManager.OnAudioFocusChangeListener { focusChange ->
+                    Log.d("MainActivity", "音频焦点变化: $focusChange")
+                },
+                AudioManager.STREAM_MUSIC,
+                AudioManager.AUDIOFOCUS_GAIN
+            )
+        } else {
+            @Suppress("DEPRECATION")
+            audioManager.requestAudioFocus(
+                null,
+                AudioManager.STREAM_MUSIC,
+                AudioManager.AUDIOFOCUS_GAIN
+            )
+        }
+        Log.d("MainActivity", "✅ 已请求音频焦点")
+    }
+
     override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
         super.configureFlutterEngine(flutterEngine)