Androidでオーディオアプリを作るということ

Androidでオーディオアプリを作るときに考慮すべきところなどを簡単に。

Transcript

1. "OESPJEͰ
   ΦʔσΟΦΞϓϦΛ
   ࡞Δͱ͍͏͜ͱ
   Zli x ΤΩαΠτ ߹ಉLT
   
   2020/09/26 ryo makiyama
   

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2. ɹɹࣗݾ঺հ
   •຀ࢁྎ
   
   •Radiotalkגࣜձࣾ
   
   •AndroidΤϯδχΞ
   
   • @_rmakiyama
   
   • rmakiyama
   

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3. Ի੠Λ࠶ੜ͢Δ
   

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4. Ի੠Λ࠶ੜ͢Δʹ͸ʁ
   • AudioTrack
   
   • SoundPool
   
   • MediaPlayer
   
   • ExoPlayer
   
   • etc…
   

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5. Ի੠Λ࠶ੜ͢Δʹ͸ʁ
   • AudioTrack
   
   • ੜͷԻ੠σʔλΛѻ͑Δ
   
   • ࠷΋஗Ԇ͕গͳ͍
   
   • ѻ͍͕೉͍͠…
   • SoundPool
   
   • ୹͍Ի੠ʹద͍ͯ͠Δ
   
   • ޮՌԻͳͲ
   
   • ෛՙ͕௿͍
   
   • ஗Ԇ͕গͳ͍
   

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6. Ի੠Λ࠶ੜ͢Δʹ͸ʁ
   • MediaPlayer
   
   • ࠷΋Ұൠత
   
   • ө૾ʹ΋ରԠ
   
   • ѻ͍͕؆୯
   
   • HLSະରԠ
   • ExoPlayer
   
   • Google੡ͷϥΠϒϥϦ
   
   • ө૾ʹ΋ରԠ
   
   • ΧελϚΠζੑ͕ߴ͍
   
   • HLS΍DASH౳ʹରԠ
   

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7. ExoPlayer
   val audioUri = Uri.parse(“https:"//sample.jp/media/media1.mp3”)
   
   val player = SimpleExoPlayer.Builder(context).build()
   
   val sourceFactory = DefaultDataSourceFactory(
   
   context,
   
   Util.getUserAgent(context, "sample")
   
   )
   
   val extractorsFactory = DefaultExtractorsFactory()
   
   val source = ProgressiveMediaSource.Factory(sourceFactory, extractorsFactory)
   
   .createMediaSource(audioUri)
   
   player.prepare(source)
   
   

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8. ؆୯
   

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9. ؆୯
   

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10. ΦʔσΟΦΞϓϦʹٻΊΒΕΔ͜ͱ
    • όοΫάϥ΢ϯυͰ࠶ੜͰ͖Δ
    
    • ΠϠϗϯ͕ൈ͚ͨΒԻ੠͕ࢭ·Δ
    
    • ผͷΞϓϦͰԻ੠Λ࠶ੜ͢Δͱఀࢭ͢Δ
    
    • ༷ʑͳσόΠε͔Βૢ࡞͕Ͱ͖Δ
    
    • etc…
    

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11. Ͳ͏΍ͬͯ΍ͬͯΔͷ
    

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12. ΦʔσΟΦΞϓϦʹٻΊΒΕΔ͜ͱ
    • όοΫάϥ΢ϯυͰ࠶ੜͰ͖Δ
    
    • ΠϠϗϯ͕ൈ͚ͨΒԻ੠͕ࢭ·Δ
    
    • ผͷΞϓϦͰԻ੠Λ࠶ੜ͢Δͱఀࢭ͢Δ
    
    • ༷ʑͳσόΠε͔Βૢ࡞͕Ͱ͖Δ
    
    • etc…
    AndroidͷServiceΛར༻͢Δ
    

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13. ΦʔσΟΦΞϓϦʹٻΊΒΕΔ͜ͱ
    • όοΫάϥ΢ϯυͰ࠶ੜͰ͖Δ
    
    • ΠϠϗϯ͕ൈ͚ͨΒԻ੠͕ࢭ·Δ
    
    • ผͷΞϓϦͰԻ੠Λ࠶ੜ͢Δͱఀࢭ͢Δ
    
    • ༷ʑͳσόΠε͔Βૢ࡞͕Ͱ͖Δ
    
    • etc… ExoPlayerઌੜ͕΍ͬͯ͘ΕΔ
    

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14. ΦʔσΟΦΞϓϦʹٻΊΒΕΔ͜ͱ
    • όοΫάϥ΢ϯυͰ࠶ੜͰ͖Δ
    
    • ΠϠϗϯ͕ൈ͚ͨΒԻ੠͕ࢭ·Δ
    
    • ผͷΞϓϦͰԻ੠Λ࠶ੜ͢Δͱఀࢭ͢Δ
    
    • ༷ʑͳσόΠε͔Βૢ࡞͕Ͱ͖Δ
    
    • etc…
    
    

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15. headset watch tv auto
    

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16. ༷ʑͳσόΠε͔Β
    ૢ࡞͞ΕΔ͜ͱΛ
    ૝ఆ͢Δඞཁ͕͋Δ
    

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17. ΦʔσΟΦΞϓϦͷਪ঑ΞʔΩςΫνϟ
    • ΫϥΠΞϯτ/αʔόʔઃܭ
    
    • ϝσΟΞίϯτϩʔϥʔ(ΫϥΠΞϯτ)
    
    • ϝσΟΞηογϣϯ(αʔόʔ)
    
    • UI౳ʹΑΔૢ࡞ͱ

    ίϯςϯπ৘ใɾϓϨΠϠʔૢ࡞Λ෼͚ͨ
    ref. https:"//developer.android.com/guide/topics/media-apps/media-apps-overview
    

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18. UI/ϝσΟΞίϯτϩʔϥʔ(ΫϥΠΞϯτ)
    • UI͸ίϯτϩʔϥʔͷΈͱ΍ΓͱΓ
    
    • ϓϨΠϠʔࣗମͱ͸௚઀΍ΓऔΓΛ͠ͳ͍
    
    • ΞΫγϣϯ͸ηογϣϯ΁ͷίʔϧόοΫʹ
    
    • ۂ৘ใͷมߋͳͲ͸ηογϣϯ͔Β

    ίϯτϩʔϥʔ͕ίʔϧόοΫܗࣜͰड͚औΔ
    

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19. ϝσΟΞηογϣϯ/ϓϨΠϠʔ(αʔόʔ)
    • 1ͭͷηογϣϯͰෳ਺ͷίϯτϩʔϥʔ͔Β

    ίʔϧόοΫΛड͚Δ͜ͱ͕Ͱ͖Δ
    
    • ϓϨΠϠʔ͸ηογϣϯ͔ΒͷΈૢ࡞͞ΕΔ
    
    • ίϯτϩʔϥʔ͔ΒͷίʔϧόοΫʹΑΓૢ࡞
    

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20. ΦʔσΟΦΞϓϦ֓ཁ
    ref. https:"//developer.android.com/guide/topics/media-apps/media-apps-overview
    controller session player
    ui
    devices/controller
    

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21. ࣮૷ฤ%
    

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22. ΦʔσΟΦΞϓϦ֓ཁʢ࣮૷دΓʣ
    ref. https:"//developer.android.com/guide/topics/media-apps/media-apps-overview
    

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23. MediaBrowserService(session/player)
    class MyMediaService : MediaBrowserServiceCompat() {
    
    private lateinit var mediaSession: MediaSessionCompat
    
    private lateinit var player: Player
    
    override fun onCreate() {
    
    super.onCreate()
    
    mediaSession = MediaSessionCompat(this, "MyMediaService").apply {
    
    …
    
    setCallback(myCallback)
    
    ɹɹɹɹɹɹ …
    
    

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24. MediaBrowserService(session/player)
    override fun onCreate() {
    
    …
    
    }
    
    private val myCallback = object : MediaSessionCompat.Callback() {
    
    override fun onPrepare() {}
    
    override fun onPlay() {}
    
    override fun onPause() {}
    
    override fun onStop() {}
    
    …
    
    }
    
    

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25. MediaBrowserService(session/player)
    …
    
    override fun onGetRoot(
    
    clientPackageName: String,
    
    clientUid: Int,
    
    rootHints: Bundle?
    
    ): BrowserRoot? {
    
    "// ઀ଓ͞ΕͨΫϥΠΞϯτͷݕূΛ͢Δ
    
    "// ઀ଓΛڋ൱͢Δͱ͖͸nullΛฦ͢
    
    return BrowserRoot("root", null)
    
    }
    
    

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26. MediaBrowserService(session/player)
    …

    override fun onLoadChildren(
    
    parentId: String,
    
    result: Result>
    
    ) {
    
    "// ΫϥΠΞϯτʹϝσΟΞͷϦετΛฦ͢
    
    val list = getMetadata()
    
    result.sendResult(list)
    
    }
    
    …
    
    

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27. Activity(UI/controller)
    class MediaPlayerActivity : AppCompatActivity() {
    
    private lateinit var mediaBrowser: MediaBrowserCompat
    
    private lateinit var mediaController: MediaControllerCompat
    
    override fun onCreate(savedInstanceState: Bundle?) {
    
    …
    
    mediaBrowser = MediaBrowserCompat(
    
    this,
    
    ComponentName(this, MyMediaService"::class.java),
    
    connectionCallbacks,
    
    null
    
    

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28. Activity(UI/controller)
    class MediaPlayerActivity : AppCompatActivity() {
    
    private lateinit var mediaBrowser: MediaBrowserCompat
    
    private lateinit var mediaController: MediaControllerCompat
    
    override fun onCreate(savedInstanceState: Bundle?) {
    
    …
    
    }
    
    override fun onStart() {
    
    super.onStart()
    
    "// MediaBrowserServiceʹ઀ଓ
    
    mediaBrowser.connect()
    
    

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29. Activity(UI/controller)
    class MediaPlayerActivity : AppCompatActivity() {
    
    …
    
    private lateinit var mediaController: MediaControllerCompat
    
    …
    
    private val connectionCallbacks = object : MediaBrowserCompat.ConnectionCallback() {
    
    override fun onConnected() {
    
    "// sessionͷτʔΫϯ͔ΒcontrollerΛੜ੒
    
    mediaController = MediaControllerCompat(this@MediaPlayerActivity, mediaBrowser.sessionToken)
    
    .apply { registerCallback(controllerCallback) }
    
    "// UIͷૢ࡞ʹԠͯ͡controllerΛհͯ͠ΦʔσΟΦΛૢ࡞
    
    "// ྫ) ࠶ੜɿmediaController.transportControls.play()
    
    

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30. Activity(UI/controller)
    class MediaPlayerActivity : AppCompatActivity() {
    
    …
    
    private var controllerCallback = object : MediaControllerCompat.Callback() {
    
    override fun onMetadataChanged(metadata: MediaMetadataCompat?) {
    
    "// ࠶ੜதͷίϯςϯπ৘ใͷมԽʹԠͯ͡UIΛߋ৽
    
    }
    
    override fun onPlaybackStateChanged(state: PlaybackStateCompat?) {
    
    "// ࠶ੜͷঢ়ଶ(࠶ੜத΍ఀࢭ)ͷมԽʹԠͯ͡UIΛߋ৽͢Δ
    
    }
    
    }
    
    

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31. ׬શʹཧղͨ͠ʁ
    

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32. ·ͱΊ
    •Ի੠Λ࠶ੜ͢Δ͚ͩͳΒ؆୯ʂ&
    
    •ΦʔσΟΦΞϓϦͰߟྀ͢Δ͜ͱ͸ҙ֎ͱଟ͍
    
    • ࠓ೔࿩͍ͯ͠ͳ͍͜ͱ΋ͨ͘͞Μ͋Δ…ʂ
    
    •ڵຯ͕༙͍ͨΒ࡞ͬͯΈΑ͏ʂ'
    
    • खΛಈ͔͢ͷେࣄʂ%
    

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