Implementar uma sessão de mídia
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Crie um
MediaSession
quando o app estiver se preparando para reproduzir mídia. O snippet de código a seguir
é um exemplo de como definir o callback e as flags adequados:
Kotlin
session = MediaSession(this, "MusicService").apply {
setCallback(MediaSessionCallback())
setFlags(
MediaSession.FLAG_HANDLES_MEDIA_BUTTONS or MediaSession.FLAG_HANDLES_TRANSPORT_CONTROLS
)
}
Java
session = new MediaSession(this, "MusicService");
session.setCallback(new MediaSessionCallback());
session.setFlags(MediaSession.FLAG_HANDLES_MEDIA_BUTTONS |
MediaSession.FLAG_HANDLES_TRANSPORT_CONTROLS);
Iniciar uma sessão de mídia
Lembre-se também de chamar
setActive(true)
quando a reprodução começar. Seu app também precisa solicitar seleção de áudio, conforme descrito em
Gerenciar a seleção de áudio. Essas etapas são
como mostrado no exemplo a seguir:
Kotlin
private fun handlePlayRequest() {
tryToGetAudioFocus()
if (!session.isActive) {
session.isActive = true
}
...
}
Java
private void handlePlayRequest() {
tryToGetAudioFocus();
if (!session.isActive()) {
session.setActive(true);
}
...
}
Atualizar o estado da reprodução
Atualize o estado da reprodução na
MediaSession
para refletir
o estado da mídia atual:
Kotlin
private fun updatePlaybackState() {
val position: Long =
mediaPlayer
?.takeIf { it.isPlaying }
?.currentPosition?.toLong()
?: PlaybackState.PLAYBACK_POSITION_UNKNOWN
val stateBuilder = PlaybackState.Builder()
.setActions(getAvailableActions()).apply {
setState(mState, position, 1.0f)
}
session.setPlaybackState(stateBuilder.build())
}
private fun getAvailableActions(): Long {
var actions = (PlaybackState.ACTION_PLAY_PAUSE
or PlaybackState.ACTION_PLAY_FROM_MEDIA_ID
or PlaybackState.ACTION_PLAY_FROM_SEARCH)
playingQueue?.takeIf { it.isNotEmpty() }?.apply {
actions = if (mState == PlaybackState.STATE_PLAYING) {
actions or PlaybackState.ACTION_PAUSE
} else {
actions or PlaybackState.ACTION_PLAY
}
if (currentIndexOnQueue > 0) {
actions = actions or PlaybackState.ACTION_SKIP_TO_PREVIOUS
}
if (currentIndexOnQueue < size - 1) {
actions = actions or PlaybackState.ACTION_SKIP_TO_NEXT
}
}
return actions
}
Java
private void updatePlaybackState() {
long position = PlaybackState.PLAYBACK_POSITION_UNKNOWN;
if (mediaPlayer != null && mediaPlayer.isPlaying()) {
position = mediaPlayer.getCurrentPosition();
}
PlaybackState.Builder stateBuilder = new PlaybackState.Builder()
.setActions(getAvailableActions());
stateBuilder.setState(mState, position, 1.0f);
session.setPlaybackState(stateBuilder.build());
}
private long getAvailableActions() {
long actions = PlaybackState.ACTION_PLAY_PAUSE |
PlaybackState.ACTION_PLAY_FROM_MEDIA_ID |
PlaybackState.ACTION_PLAY_FROM_SEARCH;
if (playingQueue == null || playingQueue.isEmpty()) {
return actions;
}
if (mState == PlaybackState.STATE_PLAYING) {
actions |= PlaybackState.ACTION_PAUSE;
} else {
actions |= PlaybackState.ACTION_PLAY;
}
if (currentIndexOnQueue > 0) {
actions |= PlaybackState.ACTION_SKIP_TO_PREVIOUS;
}
if (currentIndexOnQueue < playingQueue.size() - 1) {
actions |= PlaybackState.ACTION_SKIP_TO_NEXT;
}
return actions;
}
Defina a MediaMetadata
com o
setMetadata()
. Esse método só é chamado uma vez por objeto reproduzido. Ele permite fornecer informações para
a sessão de mídia sobre a mídia, incluindo título, subtítulo,
artista, arte etc. O exemplo a seguir é adaptado para música e
presume que os dados da faixa estão armazenados em uma classe de dados personalizada, MediaData
:
Kotlin
private fun updateMetadata(myData: MediaData) {
val metadataBuilder = MediaMetadata.Builder().apply {
// To provide most control over how an item is displayed set the
// display fields in the metadata
putString(MediaMetadata.METADATA_KEY_DISPLAY_TITLE, myData.displayTitle)
putString(MediaMetadata.METADATA_KEY_DISPLAY_SUBTITLE, myData.displaySubtitle)
putString(MediaMetadata.METADATA_KEY_DISPLAY_ICON_URI, myData.artUri)
// And at minimum the title and artist for legacy support
putString(MediaMetadata.METADATA_KEY_TITLE, myData.title)
putString(MediaMetadata.METADATA_KEY_ARTIST, myData.artist)
// A small bitmap for the artwork is also recommended
putBitmap(MediaMetadata.METADATA_KEY_ART, myData.artBitmap)
// Add any other fields you have for your data as well
}
session.setMetadata(metadataBuilder.build())
}
Java
private void updateMetadata(MediaData myData) {
MediaMetadata.Builder metadataBuilder = new MediaMetadata.Builder();
// To provide most control over how an item is displayed set the
// display fields in the metadata
metadataBuilder.putString(MediaMetadata.METADATA_KEY_DISPLAY_TITLE,
myData.displayTitle);
metadataBuilder.putString(MediaMetadata.METADATA_KEY_DISPLAY_SUBTITLE,
myData.displaySubtitle);
metadataBuilder.putString(MediaMetadata.METADATA_KEY_DISPLAY_ICON_URI,
myData.artUri);
// And at minimum the title and artist for legacy support
metadataBuilder.putString(MediaMetadata.METADATA_KEY_TITLE,
myData.title);
metadataBuilder.putString(MediaMetadata.METADATA_KEY_ARTIST,
myData.artist);
// A small bitmap for the artwork is also recommended
metadataBuilder.putBitmap(MediaMetadata.METADATA_KEY_ART,
myData.artBitmap);
// Add any other fields you have for your data as well
session.setMetadata(metadataBuilder.build());
}
O conteúdo e os exemplos de código nesta página estão sujeitos às licenças descritas na Licença de conteúdo. Java e OpenJDK são marcas registradas da Oracle e/ou suas afiliadas.
Última atualização 2025-07-27 UTC.
[null,null,["Última atualização 2025-07-27 UTC."],[],[],null,["# Implement a media session\n\nCreate a\n[`MediaSession`](/reference/android/media/session/MediaSession#MediaSession(android.content.Context,%20java.lang.String))\nwhen your app is preparing to play media. The following code snippet\nis an example of how to set the appropriate callback and flags: \n\n### Kotlin\n\n```kotlin\nsession = MediaSession(this, \"MusicService\").apply {\n setCallback(MediaSessionCallback())\n setFlags(\n MediaSession.FLAG_HANDLES_MEDIA_BUTTONS or MediaSession.FLAG_HANDLES_TRANSPORT_CONTROLS\n )\n}\n```\n\n### Java\n\n```java\nsession = new MediaSession(this, \"MusicService\");\nsession.setCallback(new MediaSessionCallback());\nsession.setFlags(MediaSession.FLAG_HANDLES_MEDIA_BUTTONS |\n MediaSession.FLAG_HANDLES_TRANSPORT_CONTROLS);\n```\n\nStart a media session\n---------------------\n\nBe sure to also call\n[`setActive(true)`](/reference/android/media/session/MediaSession#setActive(boolean))\nwhen playback begins. Your app must also request audio focus, as described in\n[Manage audio focus](/media/optimize/audio-focus). These steps are\nshown in the following example: \n\n### Kotlin\n\n```kotlin\nprivate fun handlePlayRequest() {\n\n tryToGetAudioFocus()\n\n if (!session.isActive) {\n session.isActive = true\n }\n ...\n}\n```\n\n### Java\n\n```java\nprivate void handlePlayRequest() {\n\n tryToGetAudioFocus();\n\n if (!session.isActive()) {\n session.setActive(true);\n }\n ...\n}\n```\n\nUpdate the playback state\n-------------------------\n\nUpdate the playback state in the\n[`MediaSession`](/reference/android/media/session/MediaSession) to reflect\nthe state of the current media: \n\n### Kotlin\n\n```kotlin\nprivate fun updatePlaybackState() {\n val position: Long =\n mediaPlayer\n ?.takeIf { it.isPlaying }\n ?.currentPosition?.toLong()\n ?: PlaybackState.PLAYBACK_POSITION_UNKNOWN\n\n val stateBuilder = PlaybackState.Builder()\n .setActions(getAvailableActions()).apply {\n setState(mState, position, 1.0f)\n }\n session.setPlaybackState(stateBuilder.build())\n}\n\nprivate fun getAvailableActions(): Long {\n var actions = (PlaybackState.ACTION_PLAY_PAUSE\n or PlaybackState.ACTION_PLAY_FROM_MEDIA_ID\n or PlaybackState.ACTION_PLAY_FROM_SEARCH)\n\n playingQueue?.takeIf { it.isNotEmpty() }?.apply {\n actions = if (mState == PlaybackState.STATE_PLAYING) {\n actions or PlaybackState.ACTION_PAUSE\n } else {\n actions or PlaybackState.ACTION_PLAY\n }\n if (currentIndexOnQueue \u003e 0) {\n actions = actions or PlaybackState.ACTION_SKIP_TO_PREVIOUS\n }\n if (currentIndexOnQueue \u003c size - 1) {\n actions = actions or PlaybackState.ACTION_SKIP_TO_NEXT\n }\n }\n return actions\n}\n```\n\n### Java\n\n```java\nprivate void updatePlaybackState() {\n long position = PlaybackState.PLAYBACK_POSITION_UNKNOWN;\n if (mediaPlayer != null && mediaPlayer.isPlaying()) {\n position = mediaPlayer.getCurrentPosition();\n }\n PlaybackState.Builder stateBuilder = new PlaybackState.Builder()\n .setActions(getAvailableActions());\n stateBuilder.setState(mState, position, 1.0f);\n session.setPlaybackState(stateBuilder.build());\n}\n\nprivate long getAvailableActions() {\n long actions = PlaybackState.ACTION_PLAY_PAUSE |\n PlaybackState.ACTION_PLAY_FROM_MEDIA_ID |\n PlaybackState.ACTION_PLAY_FROM_SEARCH;\n if (playingQueue == null || playingQueue.isEmpty()) {\n return actions;\n }\n if (mState == PlaybackState.STATE_PLAYING) {\n actions |= PlaybackState.ACTION_PAUSE;\n } else {\n actions |= PlaybackState.ACTION_PLAY;\n }\n if (currentIndexOnQueue \u003e 0) {\n actions |= PlaybackState.ACTION_SKIP_TO_PREVIOUS;\n }\n if (currentIndexOnQueue \u003c playingQueue.size() - 1) {\n actions |= PlaybackState.ACTION_SKIP_TO_NEXT;\n }\n return actions;\n}\n```\n\nUpdate the media metadata\n-------------------------\n\nSet the [`MediaMetadata`](/reference/android/media/MediaMetadata) with the\n[`setMetadata()`](/reference/android/media/session/MediaSession#setMetadata(android.media.MediaMetadata))\nmethod. This method is only called once per object that is played. It lets you provide information to\nthe media session about the media, including its title, subtitle,\nartist, artwork, etc. The following example is tailored toward music and\nassumes the track's data is stored in a custom data class, `MediaData`: \n\n### Kotlin\n\n```kotlin\nprivate fun updateMetadata(myData: MediaData) {\n val metadataBuilder = MediaMetadata.Builder().apply {\n // To provide most control over how an item is displayed set the\n // display fields in the metadata\n putString(MediaMetadata.METADATA_KEY_DISPLAY_TITLE, myData.displayTitle)\n putString(MediaMetadata.METADATA_KEY_DISPLAY_SUBTITLE, myData.displaySubtitle)\n putString(MediaMetadata.METADATA_KEY_DISPLAY_ICON_URI, myData.artUri)\n // And at minimum the title and artist for legacy support\n putString(MediaMetadata.METADATA_KEY_TITLE, myData.title)\n putString(MediaMetadata.METADATA_KEY_ARTIST, myData.artist)\n // A small bitmap for the artwork is also recommended\n putBitmap(MediaMetadata.METADATA_KEY_ART, myData.artBitmap)\n // Add any other fields you have for your data as well\n }\n session.setMetadata(metadataBuilder.build())\n}\n```\n\n### Java\n\n```java\nprivate void updateMetadata(MediaData myData) {\n MediaMetadata.Builder metadataBuilder = new MediaMetadata.Builder();\n // To provide most control over how an item is displayed set the\n // display fields in the metadata\n metadataBuilder.putString(MediaMetadata.METADATA_KEY_DISPLAY_TITLE,\n myData.displayTitle);\n metadataBuilder.putString(MediaMetadata.METADATA_KEY_DISPLAY_SUBTITLE,\n myData.displaySubtitle);\n metadataBuilder.putString(MediaMetadata.METADATA_KEY_DISPLAY_ICON_URI,\n myData.artUri);\n // And at minimum the title and artist for legacy support\n metadataBuilder.putString(MediaMetadata.METADATA_KEY_TITLE,\n myData.title);\n metadataBuilder.putString(MediaMetadata.METADATA_KEY_ARTIST,\n myData.artist);\n // A small bitmap for the artwork is also recommended\n metadataBuilder.putBitmap(MediaMetadata.METADATA_KEY_ART,\n myData.artBitmap);\n // Add any other fields you have for your data as well\n session.setMetadata(metadataBuilder.build());\n}\n```"]]