曲目
使用集合让一切井井有条
根据您的偏好保存内容并对其进行分类。
您的 Android TV 应用可能支持为不同的应用提供多个音频/文字轨道,
语言和环绕声设置与网络接收器相同
。为了支持多个轨道和轨道选择,您需要
在 Android TV 应用中实现以下功能:
提供轨道信息和状态
对于顶级
MediaInfo
、
提供可用的
MediaTracks
使用
MediaInfoModifier
:
val mediaInfoModifier = CastReceiverContext.getInstance()
.mediaManager.mediaStatusModifier.mediaInfoModifier
mediaInfoModifier.setMediaTracks(Arrays.asList(
new MediaTrack.Builder(1, MediaTrack.TYPE_AUDIO)
.setName("English")
...
build(),
new MediaTrack.Builder(2, MediaTrack.TYPE_AUDIO)
.setName("Spanish")
...
.build()
))
MediaInfoModifier mediaInfoModifier = CastReceiverContext.getInstance()
.getMediaManager().getMediaStatusModifier().getMediaInfoModifier();
mediaInfoModifier.setMediaTracks(Arrays.asList(
new MediaTrack.Builder(1, MediaTrack.TYPE_AUDIO)
.setName("English")
...
build(),
new MediaTrack.Builder(2, MediaTrack.TYPE_AUDIO)
.setName("Spanish")
...
.build()
));
使用
MediaTracksModifier
来反映当前选定的曲目:
val mediaStatusModifier: MediaTracksModifier =
CastReceiverContext.getInstance()
.mediaManager.mediaStatusModifier.getMediaTracksModifer()
MediaTracksModifier.setActiveTrackIds(longArrayOf(1))
MediaTracksModifier mediaStatusModifier =
CastReceiverContext.getInstance()
.getMediaManager().getMediaStatusModifier().getMediaTracksModifer();
MediaTracksModifier.setActiveTrackIds(new long[]{1});
通过上述步骤,可以确保发件人的“跟踪”选择对话框反映的是
正确状态。
处理轨道选择
如需支持选择轨道,您必须先声明
MediaStatus.COMMAND_EDIT_TRACKS
作为受支持的媒体命令
MediaStatusModifier
:
CastReceiverContext
.getInstance()
.getMediaManager()
.getMediaStatusModifier()
.setMediaCommandSupported(MediaStatus.COMMAND_EDIT_TRACKS, true)
CastReceiverContext
.getInstance()
.getMediaManager()
.getMediaStatusModifier()
.setMediaCommandSupported(MediaStatus.COMMAND_EDIT_TRACKS, true);
当用户在发送端的轨道选择对话框中选择轨道时,
您的 Android TV 应用会收到回调以更改所选轨道。
通过替换处理命令
MediaCommandCallback
:
class MyMediaCommandCallback : MediaCommandCallback() {
/** Text selection callback scoped to individual track types. */
override fun onSelectTracksByType(
senderId: String?, type: Int, tracks: List
): Task {
return Tasks.call {
// Update the track selection in your app.
if (type == MediaTrack.TYPE_TEXT) {
mySelectTextTracks(tracks)
} else if (type == MediaTrack.TYPE_AUDIO) {
mySelectAudioTracks(tracks)
}
// Update the track selection in the modifier to be used in MediaStatus.
// This is also scoped to the given track type.
mediaStatusModifier.getMediaTracksModifier().setActiveTracksByType(
type, tracks
)
null
}
}
/** Callback for setting the text track style. */
override fun onSetTextTrackStyle(
senderId: String?, textTrackStyle: TextTrackStyle
): Task {
return Tasks.call {
// Update the track style in your app.
mySetTextTrackStyle(textTrackStyle)
// Update the track style in the modifier.
mediaStatusModifier.setTextTrackStyle(textTrackStyle)
null
}
}
// Override the following callback in case you want to handle the original
// request. This is strongly not recommended.
//
// The default implementation automatically translates into
// onSelectTracksByType() and onSetTextTrackStyle().
override fun onEditTracksInfo(
senderId: String?, editTracksInfoData: EditTracksInfoData
): Task {
...
}
// Override the following callback in case you want to handle the original
// request. This is strongly not recommended.
override fun onEditAudioTracks(
senderId: String?, editAudioTracksData: EditAudioTracksData
): Task {
...
}
}
public class MyMediaCommandCallback extends MediaCommandCallback {
/** Text selection callback scoped to individual track types. */
@Override
public Task onSelectTracksByType(
String senderId, int type, List tracks) {
return Tasks.call(() -> {
// Update the track selection in your app.
if (type == MediaTrack.TYPE_TEXT) {
mySelectTextTracks(tracks);
} else if (type == MediaTrack.TYPE_AUDIO) {
mySelectAudioTracks(tracks);
}
// Update the track selection in the modifier to be used in MediaStatus.
// This is also scoped to the given track type.
mediaStatusModifier.getMediaTracksModifier().setActiveTracksByType(
type, tracks);
return null;
});
}
/** Callback for setting the text track style. */
@Override
public Task onSetTextTrackStyle(
String senderId, TextTrackStyle textTrackStyle) {
return Tasks.call(() -> {
// Update the track style in your app.
mySetTextTrackStyle(textTrackStyle);
// Update the track style in the modifier.
mediaStatusModifier.setTextTrackStyle(textTrackStyle);
return null;
});
}
// Override the following callback in case you want to handle the original
// request. This is strongly not recommended.
//
// The default implementation automatically translates into
// onSelectTracksByType() and onSetTextTrackStyle().
@Override
public Task onEditTracksInfo(
String senderId, EditTracksInfoData editTracksInfoData) {
...
}
// Override the following callback in case you want to handle the original
// request. This is strongly not recommended.
@Override
public Task onEditAudioTracks(
String senderId, EditAudioTracksData editAudioTracksData) {
...
}
}
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最后更新时间 (UTC):2025-07-25。
[null,null,["最后更新时间 (UTC):2025-07-25。"],[[["\u003cp\u003eAndroid TV apps can support multiple audio and text tracks for different languages and surround sound, similar to web receiver apps.\u003c/p\u003e\n"],["\u003cp\u003eTo enable this, developers need to implement track information, status updates, and track selection handling within their Android TV app.\u003c/p\u003e\n"],["\u003cp\u003eThis involves providing track details using \u003ccode\u003eMediaInfo\u003c/code\u003e and \u003ccode\u003eMediaTracks\u003c/code\u003e, reflecting selected tracks via \u003ccode\u003eMediaTracksModifier\u003c/code\u003e, and declaring support for the \u003ccode\u003eCOMMAND_EDIT_TRACKS\u003c/code\u003e command.\u003c/p\u003e\n"],["\u003cp\u003eWhen a user selects a track, the app receives a callback to change the selected tracks, which should be handled by overriding the \u003ccode\u003eMediaCommandCallback\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,["# Tracks\n\nYour Android TV app may support multiple audio/text tracks for different\nlanguages and surround sound settings in the same way as web receiver\napps. In order to support multiple tracks and track selection, you need to\nimplement the following in your Android TV app:\n\nProvide track info and status\n-----------------------------\n\nFor the top-level\n[`MediaInfo`](/android/reference/com/google/android/gms/cast/MediaInfo),\nprovide the available\n[`MediaTracks`](/android/reference/com/google/android/gms/cast/MediaTrack)\nusing the\n[`MediaInfoModifier`](/android/reference/com/google/android/gms/cast/tv/media/MediaInfoModifier):\nKotlin \n\n```kotlin\nval mediaInfoModifier = CastReceiverContext.getInstance()\n .mediaManager.mediaStatusModifier.mediaInfoModifier\n\nmediaInfoModifier.setMediaTracks(Arrays.asList(\n new MediaTrack.Builder(1, MediaTrack.TYPE_AUDIO)\n .setName(\"English\")\n ...\n build(),\n new MediaTrack.Builder(2, MediaTrack.TYPE_AUDIO)\n .setName(\"Spanish\")\n ...\n .build()\n ))\n```\nJava \n\n```scdoc\nMediaInfoModifier mediaInfoModifier = CastReceiverContext.getInstance()\n .getMediaManager().getMediaStatusModifier().getMediaInfoModifier();\n\nmediaInfoModifier.setMediaTracks(Arrays.asList(\n new MediaTrack.Builder(1, MediaTrack.TYPE_AUDIO)\n .setName(\"English\")\n ...\n build(),\n new MediaTrack.Builder(2, MediaTrack.TYPE_AUDIO)\n .setName(\"Spanish\")\n ...\n .build()\n ));\n```\n\nUse\n[`MediaTracksModifier`](/android/reference/com/google/android/gms/cast/tv/media/MediaTracksModifier)\nto reflect the currently selected tracks:\nKotlin \n\n```kotlin\nval mediaStatusModifier: MediaTracksModifier =\n CastReceiverContext.getInstance()\n .mediaManager.mediaStatusModifier.getMediaTracksModifer()\n\nMediaTracksModifier.setActiveTrackIds(longArrayOf(1))\n```\nJava \n\n```text\nMediaTracksModifier mediaStatusModifier =\n CastReceiverContext.getInstance()\n .getMediaManager().getMediaStatusModifier().getMediaTracksModifer();\n\nMediaTracksModifier.setActiveTrackIds(new long[]{1});\n```\n\nThe above steps can make sure the sender track selection dialog reflects the\ncorrect state.\n\nHandle track selection\n----------------------\n\nTo support selecting a track, you must first declare\n[`MediaStatus.COMMAND_EDIT_TRACKS`](/android/reference/com/google/android/gms/cast/MediaStatus#public-static-final-long-command_edit_tracks)\nas a supported media command in\n[`MediaStatusModifier`](/android/reference/com/google/android/gms/cast/tv/media/MediaStatusModifier):\nKotlin \n\n```kotlin\nCastReceiverContext\n .getInstance()\n .getMediaManager()\n .getMediaStatusModifier()\n .setMediaCommandSupported(MediaStatus.COMMAND_EDIT_TRACKS, true)\n```\nJava \n\n```scdoc\nCastReceiverContext\n .getInstance()\n .getMediaManager()\n .getMediaStatusModifier()\n .setMediaCommandSupported(MediaStatus.COMMAND_EDIT_TRACKS, true);\n```\n\nWhen the user selects tracks in the track selection dialog on the sender side,\nyour Android TV app receives a callback to change the selected tracks.\nHandle the command by overriding\n[`MediaCommandCallback`](/android/reference/com/google/android/gms/cast/tv/media/MediaCommandCallback):\nKotlin \n\n```kotlin\nclass MyMediaCommandCallback : MediaCommandCallback() {\n /** Text selection callback scoped to individual track types. */\n override fun onSelectTracksByType(\n senderId: String?, type: Int, tracks: List\n ): Task {\n return Tasks.call {\n // Update the track selection in your app.\n if (type == MediaTrack.TYPE_TEXT) {\n mySelectTextTracks(tracks)\n } else if (type == MediaTrack.TYPE_AUDIO) {\n mySelectAudioTracks(tracks)\n }\n // Update the track selection in the modifier to be used in MediaStatus.\n // This is also scoped to the given track type.\n mediaStatusModifier.getMediaTracksModifier().setActiveTracksByType(\n type, tracks\n )\n null\n }\n }\n\n /** Callback for setting the text track style. */\n override fun onSetTextTrackStyle(\n senderId: String?, textTrackStyle: TextTrackStyle\n ): Task {\n return Tasks.call {\n // Update the track style in your app.\n mySetTextTrackStyle(textTrackStyle)\n // Update the track style in the modifier.\n mediaStatusModifier.setTextTrackStyle(textTrackStyle)\n null\n }\n }\n\n // Override the following callback in case you want to handle the original\n // request. This is strongly not recommended.\n //\n // The default implementation automatically translates into\n // onSelectTracksByType() and onSetTextTrackStyle().\n override fun onEditTracksInfo(\n senderId: String?, editTracksInfoData: EditTracksInfoData\n ): Task {\n ...\n }\n\n // Override the following callback in case you want to handle the original\n // request. This is strongly not recommended.\n override fun onEditAudioTracks(\n senderId: String?, editAudioTracksData: EditAudioTracksData\n ): Task {\n ...\n }\n}\n```\nJava \n\n```gdscript\npublic class MyMediaCommandCallback extends MediaCommandCallback {\n /** Text selection callback scoped to individual track types. */\n @Override\n public Task onSelectTracksByType(\n String senderId, int type, List tracks) {\n return Tasks.call(() -\u003e {\n // Update the track selection in your app.\n if (type == MediaTrack.TYPE_TEXT) {\n mySelectTextTracks(tracks);\n } else if (type == MediaTrack.TYPE_AUDIO) {\n mySelectAudioTracks(tracks);\n }\n // Update the track selection in the modifier to be used in MediaStatus.\n // This is also scoped to the given track type.\n mediaStatusModifier.getMediaTracksModifier().setActiveTracksByType(\n type, tracks);\n return null;\n });\n }\n\n /** Callback for setting the text track style. */\n @Override\n public Task onSetTextTrackStyle(\n String senderId, TextTrackStyle textTrackStyle) {\n return Tasks.call(() -\u003e {\n // Update the track style in your app.\n mySetTextTrackStyle(textTrackStyle);\n // Update the track style in the modifier.\n mediaStatusModifier.setTextTrackStyle(textTrackStyle);\n return null;\n });\n }\n\n // Override the following callback in case you want to handle the original\n // request. This is strongly not recommended.\n //\n // The default implementation automatically translates into\n // onSelectTracksByType() and onSetTextTrackStyle().\n @Override\n public Task onEditTracksInfo(\n String senderId, EditTracksInfoData editTracksInfoData) {\n ...\n }\n\n // Override the following callback in case you want to handle the original\n // request. This is strongly not recommended.\n @Override\n public Task onEditAudioTracks(\n String senderId, EditAudioTracksData editAudioTracksData) {\n ...\n }\n}\n```"]]