Add MediaNotificationManager for notification handling

Author: osphvdhwj

external-player/src/main/java/org/newpipe/externalplayer/MediaNotificationManager.kt

@@ -0,0 +1,46 @@
+package org.newpipe.externalplayer
+
+import android.app.Notification
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import android.graphics.BitmapFactory
+import androidx.core.app.NotificationCompat
+import androidx.media.app.NotificationCompat.MediaStyle
+
+class MediaNotificationManager(private val context: Context) {
+
+    fun buildNotification(player: com.google.android.exoplayer2.ExoPlayer?, token: android.os.Parcelable?): Notification {
+        val playIntent = Intent(context, PlayerService::class.java).apply { action = PlayerService.ACTION_PLAY }
+        val pauseIntent = Intent(context, PlayerService::class.java).apply { action = PlayerService.ACTION_PAUSE }
+        val stopIntent = Intent(context, PlayerService::class.java).apply { action = PlayerService.ACTION_STOP }
+
+        val playPending = PendingIntent.getService(context, 0, playIntent, PendingIntent.FLAG_IMMUTABLE)
+        val pausePending = PendingIntent.getService(context, 1, pauseIntent, PendingIntent.FLAG_IMMUTABLE)
+        val stopPending = PendingIntent.getService(context, 2, stopIntent, PendingIntent.FLAG_IMMUTABLE)
+
+        val isPlaying = player?.isPlaying == true
+        val action = if (isPlaying) {
+            NotificationCompat.Action(android.R.drawable.ic_media_pause, "Pause", pausePending)
+        } else {
+            NotificationCompat.Action(android.R.drawable.ic_media_play, "Play", playPending)
+        }
+
+        val mediaStyle = MediaStyle()
+        token?.let { mediaStyle.setMediaSession(it as android.media.session.MediaSession.Token) }
+
+        val builder = NotificationCompat.Builder(context, PlayerService.CHANNEL_ID)
+            .setContentTitle("NewPipe External Player")
+            .setContentText("Playing")
+            .setSmallIcon(android.R.drawable.ic_media_play)
+            .setLargeIcon(BitmapFactory.decodeResource(context.resources, android.R.mipmap.sym_def_app_icon))
+            .addAction(action)
+            .addAction(NotificationCompat.Action(android.R.drawable.ic_media_previous, "Stop", stopPending))
+            .setStyle(mediaStyle)
+            .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
+            .setOnlyAlertOnce(true)
+            .setOngoing(isPlaying)
+
+        return builder.build()
+    }
+}