Enable subtitle selection in session demo app

Issue: androidx/media#102
#minor-release
PiperOrigin-RevId: 462391045

demos/session/src/main/assets/catalog.json

@@ -13,10 +13,25 @@
       "id": "video_02",
       "title": "TTML Netflix Japanese examples (IMSC1.1)",
       "source": "https://storage.googleapis.com/exoplayer-test-media-1/gen-3/screens/dash-vod-single-segment/video-avc-baseline-480.mp4",
+      "album": "Video with subtitle",
+      "artist": "Subtitles",
+      "genre": "Video",
+      "image": "https://cdn.pixabay.com/photo/2014/10/09/13/14/video-481821_960_720.png",
+      "subtitles": [
+        {
           "subtitle_uri": "https://storage.googleapis.com/exoplayer-test-media-1/ttml/netflix_japanese_ttml.xml",
+          "subtitle_mime_type": "application/ttml+xml",
+          "subtitle_lang": "ja"
+        }
+      ]
+    },
+    {
+      "id": "video_03",
+      "title": "MPEG-4 Timed Text",
       "album": "Video with subtitle",
-      "artist": "Netflix",
+      "artist": "Subtitles",
       "genre": "Video",
+      "source": "https://storage.googleapis.com/exoplayer-test-media-1/mp4/dizzy-with-tx3g.mp4",
       "image": "https://cdn.pixabay.com/photo/2014/10/09/13/14/video-481821_960_720.png"
     },
     {

demos/session/src/main/java/androidx/media3/demo/session/MediaItemTree.kt

@@ -18,6 +18,7 @@ package androidx.media3.demo.session
 import android.content.res.AssetManager
 import android.net.Uri
 import androidx.media3.common.MediaItem
+import androidx.media3.common.MediaItem.SubtitleConfiguration
 import androidx.media3.common.MediaMetadata
 import androidx.media3.common.MediaMetadata.FOLDER_TYPE_MIXED
 import androidx.media3.common.MediaMetadata.FOLDER_TYPE_NONE
@@ -65,13 +66,13 @@ object MediaItemTree {
     mediaId: String,
     isPlayable: Boolean,
     @MediaMetadata.FolderType folderType: Int,
+    subtitleConfigurations: List<SubtitleConfiguration> = mutableListOf(),
     album: String? = null,
     artist: String? = null,
     genre: String? = null,
     sourceUri: Uri? = null,
-    imageUri: Uri? = null,
+    imageUri: Uri? = null
   ): MediaItem {
-    // TODO(b/194280027): add artwork
     val metadata =
       MediaMetadata.Builder()
         .setAlbumTitle(album)
@@ -82,8 +83,10 @@ object MediaItemTree {
         .setIsPlayable(isPlayable)
         .setArtworkUri(imageUri)
         .build()
+
     return MediaItem.Builder()
       .setMediaId(mediaId)
+      .setSubtitleConfigurations(subtitleConfigurations)
       .setMediaMetadata(metadata)
       .setUri(sourceUri)
       .build()
@@ -156,6 +159,19 @@ object MediaItemTree {
     val title = mediaObject.getString("title")
     val artist = mediaObject.getString("artist")
     val genre = mediaObject.getString("genre")
+    val subtitleConfigurations: MutableList<SubtitleConfiguration> = mutableListOf()
+    if (mediaObject.has("subtitles")) {
+      val subtitlesJson = mediaObject.getJSONArray("subtitles")
+      for (i in 0 until subtitlesJson.length()) {
+        val subtitleObject = subtitlesJson.getJSONObject(i)
+        subtitleConfigurations.add(
+          SubtitleConfiguration.Builder(Uri.parse(subtitleObject.getString("subtitle_uri")))
+            .setMimeType(subtitleObject.getString("subtitle_mime_type"))
+            .setLanguage(subtitleObject.getString("subtitle_lang"))
+            .build()
+        )
+      }
+    }
     val sourceUri = Uri.parse(mediaObject.getString("source"))
     val imageUri = Uri.parse(mediaObject.getString("image"))
     // key of such items in tree
@@ -170,12 +186,13 @@ object MediaItemTree {
           title = title,
           mediaId = idInTree,
           isPlayable = true,
+          folderType = FOLDER_TYPE_NONE,
+          subtitleConfigurations,
           album = album,
           artist = artist,
           genre = genre,
           sourceUri = sourceUri,
-          imageUri = imageUri,
-          folderType = FOLDER_TYPE_NONE
+          imageUri = imageUri
         )
       )
 
@@ -188,7 +205,8 @@ object MediaItemTree {
             title = album,
             mediaId = albumFolderIdInTree,
             isPlayable = true,
-            folderType = FOLDER_TYPE_PLAYLISTS
+            folderType = FOLDER_TYPE_PLAYLISTS,
+            subtitleConfigurations
           )
         )
       treeNodes[ALBUM_ID]!!.addChild(albumFolderIdInTree)
@@ -203,7 +221,8 @@ object MediaItemTree {
             title = artist,
             mediaId = artistFolderIdInTree,
             isPlayable = true,
-            folderType = FOLDER_TYPE_PLAYLISTS
+            folderType = FOLDER_TYPE_PLAYLISTS,
+            subtitleConfigurations
           )
         )
       treeNodes[ARTIST_ID]!!.addChild(artistFolderIdInTree)
@@ -218,7 +237,8 @@ object MediaItemTree {
             title = genre,
             mediaId = genreFolderIdInTree,
             isPlayable = true,
-            folderType = FOLDER_TYPE_PLAYLISTS
+            folderType = FOLDER_TYPE_PLAYLISTS,
+            subtitleConfigurations
           )
         )
       treeNodes[GENRE_ID]!!.addChild(genreFolderIdInTree)

demos/session/src/main/java/androidx/media3/demo/session/PlayerActivity.kt

@@ -29,9 +29,11 @@ import android.widget.ListView
 import android.widget.TextView
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.content.ContextCompat
+import androidx.media3.common.C.TRACK_TYPE_TEXT
 import androidx.media3.common.MediaItem
 import androidx.media3.common.MediaMetadata
 import androidx.media3.common.Player
+import androidx.media3.common.Tracks
 import androidx.media3.session.MediaController
 import androidx.media3.session.SessionToken
 import androidx.media3.ui.PlayerView
@@ -147,6 +149,10 @@ class PlayerActivity : AppCompatActivity() {
         override fun onRepeatModeChanged(repeatMode: Int) {
           updateRepeatSwitchUI(repeatMode)
         }
+
+        override fun onTracksChanged(tracks: Tracks) {
+          playerView.setShowSubtitleButton(tracks.isTypeSupported(TRACK_TYPE_TEXT))
+        }
       }
     )
   }