99 lines
4.7 KiB
Kotlin
99 lines
4.7 KiB
Kotlin
package top.yeij.hearth.media
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import android.content.ComponentName
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import android.content.Context
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import android.media.MediaMetadata
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import android.media.session.MediaController
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import android.media.session.MediaSessionManager
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import android.media.session.PlaybackState
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import android.util.Log
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// 监听系统活跃媒体会话，取第一个 controller 的 metadata + playbackState 构造 MediaInfo 回调
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// Watch active media sessions; build MediaInfo from the first controller's metadata + playbackState
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class MediaSessionSource(context: Context) {
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private val msm = context.getSystemService(Context.MEDIA_SESSION_SERVICE) as MediaSessionManager
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// 通知监听组件作为授权凭据传入 addOnActiveSessionsChangedListener，
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// 取代依赖 MEDIA_CONTENT_CONTROL 系统权限的 null 方案。
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// The notification listener component is passed as the authorization credential,
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// replacing the null-based approach that relied on the MEDIA_CONTENT_CONTROL permission.
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private val listenerComponent = ComponentName(context, HearthNotificationListenerService::class.java)
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private var callback: ((MediaInfo?) -> Unit)? = null
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private var registered = false
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// 具名监听器字段：会话列表变化时回调
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// Named listener field: fires when the active-session list changes
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private val activeSessionsListener =
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MediaSessionManager.OnActiveSessionsChangedListener { controllers ->
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val cb = callback ?: return@OnActiveSessionsChangedListener
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notifyMedia(controllers?.firstOrNull(), cb)
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}
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// 注册监听：幂等——先移除旧监听再注册，避免重复 start 累积监听器。
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// 注册后主动拉取一次当前活跃会话：注册前已开始的播放不会触发变化回调，
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// 主动拉取保证启动时媒体卡即可显示。
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// Register the listener: idempotent — remove the old one first to avoid accumulation.
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// After registering, actively pull the current sessions once: playback that started
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// before registration never fires the change callback, so the active pull makes the
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// media card show immediately on startup.
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fun start(cb: (MediaInfo?) -> Unit) {
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stop()
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callback = cb
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try {
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msm.addOnActiveSessionsChangedListener(activeSessionsListener, listenerComponent)
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registered = true
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Log.d(TAG, "start: media session listener registered")
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val current = msm.getActiveSessions(listenerComponent).firstOrNull()
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notifyMedia(current, cb)
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} catch (e: SecurityException) {
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// 未授权「通知使用权」时系统抛 SecurityException：媒体监听降级为不可用，不崩溃。
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// 用户在系统设置开启通知使用权后，重启 Hearth 才会恢复媒体卡。
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// MediaSessionService throws SecurityException without notification access;
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// degrade to media listening disabled instead of crashing. Media card recovers
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// after the user grants notification access and restarts Hearth.
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Log.w(TAG, "start: no notification access, media listener disabled: ${e.message}")
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registered = false
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}
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}
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// 注销监听：释放回调引用，供 Activity onDestroy 调用
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// Unregister the listener: release the callback, call from Activity onDestroy
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fun stop() {
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if (registered) {
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msm.removeOnActiveSessionsChangedListener(activeSessionsListener)
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registered = false
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Log.d(TAG, "stop: media session listener removed")
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}
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callback = null
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}
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// 从 controller 提取 metadata + playbackState 构造 MediaInfo 并回调
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// Build MediaInfo from the controller's metadata + playbackState and invoke the callback
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private fun notifyMedia(controller: MediaController?, cb: (MediaInfo?) -> Unit) {
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if (controller == null) {
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Log.d(TAG, "no active media session")
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cb(null)
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return
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}
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val meta = controller.metadata
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val state = controller.playbackState
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cb(
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MediaInfo(
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meta?.getString(MediaMetadata.METADATA_KEY_TITLE) ?: "",
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meta?.getString(MediaMetadata.METADATA_KEY_ARTIST) ?: "",
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meta?.getString(MediaMetadata.METADATA_KEY_ALBUM) ?: "",
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state?.state == PlaybackState.STATE_PLAYING,
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state?.position ?: 0L,
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meta?.getLong(MediaMetadata.METADATA_KEY_DURATION) ?: 0L,
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controller.packageName,
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)
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)
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Log.d(TAG, "media: ${controller.packageName}")
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}
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companion object {
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private const val TAG = "HearthMedia"
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}
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}
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