Cast 中的佇列模型與 MediaSession
中的不同。Cast Connect 程式庫不支援讀取 MediaSession
提供的佇列。
處理佇列載入作業,並設定佇列資訊
排隊載入的做法與載入單一項目的方式相同 (透過意圖啟動活動)。您必須使用我們的用戶端程式庫,將意圖解析為 MediaLoadRequestData
。MediaQueueData
欄位包含要載入的佇列資訊。
fun handleCastLoad(requestData: MediaLoadRequestData?) { if (requestData.getQueueData()) { // If MediaQueueData is specified, this is a queue load request. myPlayer.load( requestData.getQueueData().getItems().get(0)) // Set media status. castReceiverContext.getMediaManager() .setDataFromLoad(requestData) // This clears all status overrides. // The queue information is updated with // the MediaQueueData in the request. ... mediaSession.setPlaybackState(...) } }
private void handleCastLoad(MediaLoadRequestData requestData) { if (requestData.getQueueData()) { // If MediaQueueData is specified, this is a queue load request. myPlayer.load( requestData.getQueueData().getItems().get(0)); // Set media status. castReceiverContext.getMediaManager() .setDataFromLoad(requestData) // This clears all status overrides. // The queue information is updated with // the MediaQueueData in the request. ...; mediaSession.setPlaybackState(...); } }
變更佇列
如果佇列有所變更 (例如來自 queueInsert()
),您可以使用 MediaQueueManager
更新佇列。如果您要建立新的佇列項目,請務必在建構工具上呼叫 setItemId()
,並使用 MediaQueueManager.autoGenerateItemId()
產生項目 ID,藉此設定項目 ID。透過 setDataFromLoad()
載入的待播清單項目已設定項目 ID。
val mediaManager: MediaManager = castReceiverContext.getMediaManager() val mediaQueueManager = mediaManager.getMediaQueueManager() mediaQueueManager.getQueueItems().add( /* position= */index, mediaQueueItem) mediaManager.broadcastMediaStatus()
MediaManager mediaManager = castReceiverContext.getMediaManager(); MediaQueueManager mediaQueueManager = mediaManager.getMediaQueueManager(); mediaQueueManager.getQueueItems().add(/* position= */ index, mediaQueueItem); mediaManager.broadcastMediaStatus();
Android TV 應用程式也會處理 onQueueUpdate()
回呼,以便跳轉至佇列項目,並略過下一/上一首:
class MyMediaCommandCallback : MediaCommandCallback() { override fun onQueueUpdate( queueUpdateRequestData: QueueUpdateRequestData ): Task{ ... var newItemId = MediaQueueItem.INVALID_ITEM_ID if (queueUpdateRequestData.getJump() != null) { newItemId = myGetRelativeItemId(queueUpdateRequestData.getJump()) } else if (queueUpdateRequestData.getCurrentItemId() != null) { newItemId = queueUpdateRequestData.getCurrentItemId() } if (newItemId != MediaQueueItem.INVALID_ITEM_ID) { castReceiverContext.getMediaManager().getMediaQueueManager() .setCurrentItemId(newItemId) castReceiverContext.getMediaManager().broadcastMediaStatus() } } } val mediaManager = CastReceiverContext.getInstance().getMediaQueueManager() mediaManager.setMediaCommandCallback(MyMediaCommandCallback())
public class MyMediaCommandCallback extends MediaCommandCallback { @Override public TaskonQueueUpdate( QueueUpdateRequestData queueUpdateRequestData) { ... int newItemId = MediaQueueItem.INVALID_ITEM_ID; if (queueUpdateRequestData.getJump() != null) { newItemId = myGetRelativeItemId(queueUpdateRequestData.getJump()); } else if (queueUpdateRequestData.getCurrentItemId() != null) { newItemId = queueUpdateRequestData.getCurrentItemId(); } if (newItemId != MediaQueueItem.INVALID_ITEM_ID) { castReceiverContext.getMediaManager().getMediaQueueManager() .setCurrentItemId(newItemId); castReceiverContext.getMediaManager().broadcastMediaStatus(); } } MediaManager mediaManager = CastReceiverContext.getInstance().getMediaManager(); mediaManager.setMediaCommandCallback(new MyMediaCommandCallback());
處理佇列相關的傳輸控制
您可能還想實作與佇列相關的傳輸控制回呼,例如 onSkipToNext()
、onSkipToPrevious()
或 onSkipToQueueItem()
。
class MyMediaSessionCallback : MediaSessionCompat.Callback() { override fun onSkipToNext() { // Skip to next item in queue ... } override fun onSkipToPrevious() { // Skip to previous item in queue ... } override fun onSkipToQueueItem(pos: Long) { // Skip to specified queue item ... } ... } mediaSession.setCallback(MyMediaSessionCallback())
public class MyMediaSessionCallback extends MediaSessionCompat.Callback { @Override public void onSkipToNext() { // Skip to next item in queue ... } @Override public void onSkipToPrevious() { // Skip to previous item in queue ... } @Override public void onSkipToQueueItem (long pos) { // Skip to specified queue item ... } ... } mediaSession.setCallback(new MyMediaSessionCallback());