新推送到达时如何提前终止当前推送通知音效？含29秒铃声场景

Absolutely, this is totally achievable—you just need to take control of audio playback instead of relying solely on the system's default notification handling. Here's how to implement it across iOS and Android:

iOS Implementation #

On iOS, the system manages default notification sounds, but to interrupt and replace a playing ringtone, you’ll need to handle audio playback yourself using AVPlayer/AVAudioPlayer and listen for notification delivery events.

1. Configure Audio Session: First, set up your app’s audio session to allow background playback. Add this in your AppDelegate or SceneDelegate on launch:

   import AVFoundation
   
   do {
       try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
       try AVAudioSession.sharedInstance().activate()
   } catch {
       print("Audio session setup failed: \(error)")
   }
   

2. Track Active Player: Keep a class-level reference to your audio player so you can stop it when a new notification arrives:

   var activePlayer: AVPlayer?
   

3. Handle Notification Delivery: When a notification comes in (foreground or background), stop the current player if it’s running, then initialize a new one with your custom sound:

   func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
       // Stop existing playback
       activePlayer?.pause()
       activePlayer = nil
   
       // Play new notification sound
       if let soundURL = Bundle.main.url(forResource: "your-custom-sound", withExtension: "mp3") {
           activePlayer = AVPlayer(url: soundURL)
           activePlayer?.play()
       }
   
       completionHandler([.sound, .banner])
   }
   

   Note: Since you’re managing playback yourself, the 30-second limit for default system notification sounds doesn’t apply here—your 29-second audio will work fine.

Android Implementation #

On Android, use a BroadcastReceiver to listen for incoming notifications and MediaPlayer to control audio playback.

1. Register a Broadcast Receiver: Add this to your app manifest to declare the receiver:

   <receiver android:name=".NotificationReceiver" />
   

2. Implement Audio Control in the Receiver: In the receiver, check for an active MediaPlayer instance, stop it if it’s playing, then start playback for the new notification:

   class NotificationReceiver : BroadcastReceiver() {
       private var mediaPlayer: MediaPlayer? = null
   
       override fun onReceive(context: Context, intent: Intent) {
           // Clean up existing player
           mediaPlayer?.let {
               if (it.isPlaying) it.stop()
               it.release()
               mediaPlayer = null
           }
   
           // Play new notification sound
           mediaPlayer = MediaPlayer.create(context, R.raw.your_custom_sound)
           mediaPlayer?.start()
       }
   }
   

3. Trigger the Receiver: When building your notification, use a custom intent to trigger your receiver instead of relying on the system’s default sound. If using Firebase Cloud Messaging, you can also handle playback directly in onMessageReceived.

Key Tips for Both Platforms #

• Audio Focus: Always request audio focus before playing (iOS handles this via the playback category; Android requires AudioManager.requestAudioFocus()) to ensure your sound interrupts other media.
• Background Permissions: For notifications received when the app is in the background, enable necessary permissions: iOS needs "Audio, AirPlay, and Picture in Picture" under Background Modes; Android may require FOREGROUND_SERVICE.
• Memory Management: Always release audio players when they’re no longer needed to avoid memory leaks.

内容的提问来源于stack exchange，提问作者user8674636