开发监听第三方应用通知并播放音效的应用：可行性及API咨询

Absolutely! This is a feasible project, though implementation details vary significantly between Android and iOS due to their respective platform restrictions. Below’s a breakdown of how to approach each, along with the key APIs you’ll need:

Android: Straightforward with NotificationListenerService #

Android provides a dedicated API for listening to system-wide notifications, and you don’t need to access notification content at all—just react to the event of a notification being posted.

Key Requirements & APIs #

• Permission: Your app will need the android.permission.ACCESS_NOTIFICATION_POLICY permission, and users must explicitly grant access via system settings (Settings > Notifications > Notification access). This is a special permission, so you’ll need to prompt users to navigate to the settings screen if they don’t grant it initially.
• Core API: Use NotificationListenerService, a subclass of Service that lets you listen for notification events. You only need to override the onNotificationPosted() method—this triggers every time a new notification is posted to the system.

Example Code Snippet #

Here’s a minimal implementation that plays a sound when a notification is detected:

class NotificationSoundListener : NotificationListenerService() {
    override fun onNotificationPosted(sbn: StatusBarNotification?) {
        super.onNotificationPosted(sbn)
        // Play your sound here—no need to access sbn content unless filtering is desired
        val mediaPlayer = MediaPlayer.create(this, R.raw.custom_notification_sound)
        mediaPlayer.start()
        mediaPlayer.setOnCompletionListener { it.release() }
    }
}

Don’t forget to declare the service in your AndroidManifest.xml:

<service
    android:name=".NotificationSoundListener"
    android:label="Notification Sound Player"
    android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE">
    <intent-filter>
        <action android:name="android.service.notification.NotificationListenerService" />
    </intent-filter>
</service>

Notes #

• You can add filters to play sounds only for specific apps (check sbn.packageName), but this is optional since you don’t need content access.
• Handle audio focus properly to avoid conflicting with other apps—use AudioManager to request temporary focus before playing your sound.

iOS: Limited Feasibility Due to Privacy Restrictions #

iOS is much stricter about accessing other apps’ data, including notifications. Unfortunately, there’s no official way to listen to arbitrary third-party notifications without explicit integration from those apps. Here’s what you can do:

Possible Workarounds (With Caveats) #

• Notification Service Extension: If a third-party app sends notifications with the mutable-content flag set, you can use a UNNotificationServiceExtension to intercept the notification before it’s displayed. However, this only works for apps that enable this flag (many don’t), and you still can’t access all system-wide notifications.
• Accessibility API: While technically possible to use accessibility features to detect notifications, this violates App Store guidelines unless your app is specifically designed for accessibility purposes. Your app will likely be rejected if you use this for general notification listening.

Key Takeaway for iOS #

Unless you’re targeting a specific set of apps that support integration with your service, building a system-wide notification sound player isn’t feasible on iOS due to Apple’s privacy constraints.

General Considerations #

• Battery Optimization: On both platforms, keep your listener lightweight—avoid unnecessary work during notification events to prevent battery drain.
• User Consent: Clearly explain to users why your app needs notification access (e.g., "Play custom sounds for your incoming notifications") to improve permission acceptance rates.
• Audio Playback: Ensure your sound plays even when the device is in silent mode (on Android, use AudioManager.STREAM_NOTIFICATION; on iOS, configure your audio session appropriately).

内容的提问来源于stack exchange，提问作者tzador