android 10 在通知上搜索栏

Question

有谁知道android 10中通知的seekbar功能吗？

我似乎无法让位置指示器显示当前位置。该栏只是空白，但我可以通过单击通知中的栏来查找媒体。

我有正常的通知生成器代码，我添加了这个代码，使搜索栏在 libvlc 的“MediaPlayer.Event.Playing”事件中可点击

MediaMetadataCompat.Builder metadataBuilder = new MediaMetadataCompat.Builder();


metadataBuilder.putLong(MediaMetadataCompat.METADATA_KEY_DURATION, mMediaPlayer.getLength());

PlaybackStateCompat.Builder mStateBuilder = new PlaybackStateCompat.Builder()
        .setState(PlaybackStateCompat.STATE_PLAYING,  1, 1.0f)
        .setBufferedPosition(mMediaPlayer.getLength())
        .setActions(
                PlaybackStateCompat.ACTION_PLAY |
                        PlaybackStateCompat.ACTION_PAUSE |
                        PlaybackStateCompat.ACTION_SKIP_TO_NEXT |
                        PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS |
                        PlaybackStateCompat.ACTION_SEEK_TO |
                        PlaybackStateCompat.ACTION_PLAY_PAUSE);


mediaSession.setMetadata(metadataBuilder.build());
mediaSession.setPlaybackState(mStateBuilder.build());

媒体播放大约一半，但没有指示其位置。

Answer 1

找了半天终于找到解决办法了。请按照以下步骤在 Android 10 或更高版本的通知中显示 SeekBar。

• 第 1 步:将文件的持续时间(以毫秒为单位)作为 Long 值，并在 中使用键 MediaMetadataCompat.METADATA_KEY_DURATION MediaSession.setMetadata

mediaSession.setMetadata(MediaMetadataCompat.Builder()
    .putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, resource)
    .putString(
        MediaMetadataCompat.METADATA_KEY_ARTIST,
        activeBookFile.title
    )
    .putString(
        MediaMetadataCompat.METADATA_KEY_ALBUM,
        AudioPlayerService.activeBook.title
    )
    .putString(
        MediaMetadataCompat.METADATA_KEY_TITLE,
        AudioPlayerService.activeBook.title
    )
    .putLong(
        MediaMetadataCompat.METADATA_KEY_DURATION,
        activeBookFile.duration
    )
    .build()
)

• 第 2 步:将 ACTION_SEEK_TO 添加到所有 PlaybackStateCompat.setAction() 方法
• 第 3 步:提供以 毫秒 为单位的有效 currentPosition 和播放项目的当前状态，然后将它们传递给PlaybackStateCompat.setState() 方法。
• 第 4 步:使用 setPlaybackState()
将 playBackState 对象设置为您的 mediaSession

fun updateMediaPlaybackState(currentPos: Long) {
    mediaSession.setPlaybackState(
        PlaybackStateCompat.Builder()
            .setActions(
                PlaybackStateCompat.ACTION_PLAY
                        or PlaybackStateCompat.ACTION_PLAY_PAUSE
                        or PlaybackStateCompat.ACTION_PAUSE
                        or PlaybackStateCompat.ACTION_SKIP_TO_NEXT
                        or PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS
                        or PlaybackStateCompat.ACTION_SEEK_TO
            )
            .setState(
                getPlaybackState(),
                currentPos,
                1f,
                SystemClock.elapsedRealtime()
            )
            .build()
    )
}

@PlaybackStateCompat.State
private fun getPlaybackState(): Int {
        return when (currentState) {
            is PlayerStoppedState -> PlaybackStateCompat.STATE_STOPPED
            is PlayerPausedState -> PlaybackStateCompat.STATE_PAUSED
            is PlayerResumingState -> PlaybackStateCompat.STATE_PLAYING
            is PlayerLoadingState, is PlayerBufferingState -> PlaybackStateCompat.STATE_BUFFERING
            is PlayerErrorState -> PlaybackStateCompat.STATE_ERROR
            else -> PlaybackStateCompat.STATE_NONE
        }
    }

• 第 5 步:支持用户触摸 SeekBar 覆盖 MediaSessionCompat.Callback() 中的 onSeekTo(pos: Long) 方法

class PlayerMediaSessionCallback(mediaPlayer: MediaPlayer?) : MediaSessionCompat.Callback() {

// other callback methods

    override fun onSeekTo(pos: Long) {
        mediaPlayer?.seekTo(pos)
    }
}

• 注意:每当您的播放器(播放、暂停、跳过下一步)发生状态变化时，请记住调用updateMediaPlaybackState() 和showNotification() , skipPrevious, seek 等)