add earphone plugged listener

Author: jonashao

app/src/main/java/com/junnanhao/next/player/IPlayer.kt

@@ -6,7 +6,6 @@ import com.junnanhao.next.data.model.Song
  * Created by Jonas on 2017/5/26.
  * define interfaces of player
  */
-@Suppress("UNUSED")
 interface IPlayer {
     fun play(): Boolean
     fun play(song: Song): Boolean
@@ -17,4 +16,5 @@ interface IPlayer {
     fun getPlayingSong(): Song?
     fun seekTo(position: Int): Boolean
     fun release()
+    fun duck()
 }

app/src/main/java/com/junnanhao/next/player/Player.kt

@@ -34,6 +34,7 @@ class Player private constructor() : IPlayer {
                 player.setOnPreparedListener {
                     playbackCallback?.onPrepared(currentSong)
                     player.start()
+                    player.setVolume(1.0f, 1.0f)
                 }
                 player.setOnErrorListener { mp, what, extra ->
                     playbackCallback?.onComplete()
@@ -52,6 +53,11 @@ class Player private constructor() : IPlayer {
         return false
     }
 
+    override fun duck() {
+        if (isPlaying())
+            player.setVolume(0.1f, 0.1f)
+    }
+
 
     override fun play(song: Song): Boolean {
         playList.reset(song = song)

app/src/main/java/com/junnanhao/next/ui/player/PlayerContract.kt

@@ -8,7 +8,6 @@ import com.junnanhao.next.data.model.Song
  * Created by Jonas on 2017/5/27.
  * player contract
  */
-@Suppress("UNUSED")
 interface PlayerContract {
     interface View : BaseView<Presenter> {
         fun showError(error:String)
@@ -22,6 +21,7 @@ interface PlayerContract {
         fun next()
         fun pause()
         fun play()
+        fun duck()
         fun playPause()
         fun scan()
     }

app/src/main/java/com/junnanhao/next/ui/player/PlayerFragment.kt

@@ -1,7 +1,10 @@
 package com.junnanhao.next.ui.player
 
 import android.Manifest
+import android.content.BroadcastReceiver
 import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
 import android.graphics.*
 import android.os.Bundle
 import android.support.v4.app.Fragment
@@ -18,6 +21,7 @@ import android.support.v4.view.GestureDetectorCompat
 import timber.log.Timber
 import android.graphics.drawable.BitmapDrawable
 import android.graphics.drawable.Drawable
+import android.media.AudioManager
 import android.support.v4.content.ContextCompat
 import android.support.v7.graphics.Palette
 import android.view.*
@@ -55,6 +59,8 @@ class PlayerFragment : Fragment(), PlayerContract.View {
     }
 
     lateinit var mDetector: GestureDetectorCompat
+    lateinit var mBecomingNoisyReceiver: BroadcastReceiver
+    lateinit var mHeadphonePluggedReceiver: BroadcastReceiver
 
     override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {
         val view: View = inflater!!.inflate(R.layout.frag_player, container, false)
@@ -64,19 +70,43 @@ class PlayerFragment : Fragment(), PlayerContract.View {
         return view
     }
 
-    fun measure() {
-        val wm: WindowManager = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager
-        val size: Point = Point()
-        wm.defaultDisplay.getSize(size)
-        rect = Rect(0,
-                (size.y * 0.2).toInt(),
-                size.x,
-                (size.y * 0.8).toInt())
-    }
-
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        val result = (context.getSystemService(Context.AUDIO_SERVICE) as AudioManager).requestAudioFocus({
+            focusChange: Int ->
+            when (focusChange) {
+                AudioManager.AUDIOFOCUS_GAIN -> mPresenter.play()
+                AudioManager.AUDIOFOCUS_LOSS -> mPresenter.pause()
+                AudioManager.AUDIOFOCUS_LOSS_TRANSIENT -> {
+                    mPresenter.pause()
+                }
+                AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK -> mPresenter.pause()
+            }
+        }, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN)
+
+        if (result != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
+            Toast.makeText(context, getString(R.string.warning_cannot_get_audio_focus), Toast.LENGTH_SHORT).show()
+        }
+
+        mBecomingNoisyReceiver = object : BroadcastReceiver() {
+            override fun onReceive(context: Context?, intent: Intent?) {
+                if (intent?.getAction().equals(AudioManager.ACTION_AUDIO_BECOMING_NOISY)) {
+                    Timber.wtf("become noisy")
+                    mPresenter.pause()
+                }
+            }
+        }
+        mHeadphonePluggedReceiver = object : BroadcastReceiver() {
+            override fun onReceive(context: Context?, intent: Intent?) {
+                if (intent?.getAction().equals(Intent.ACTION_HEADSET_PLUG)) {
+                    if (intent?.getIntExtra("state", -1) == 1) {
+                        Timber.wtf("Headset is plugged")
+                        mPresenter.start()
+                    }
+                }
+            }
+        }
+
         mDetector = GestureDetectorCompat(context, object : GestureDetector.SimpleOnGestureListener() {
             override fun onFling(e1: MotionEvent, e2: MotionEvent, velocityX: Float, velocityY: Float): Boolean {
                 Timber.wtf("fling")
@@ -106,6 +136,32 @@ class PlayerFragment : Fragment(), PlayerContract.View {
         })
     }
 
+
+    override fun onStart() {
+        super.onStart()
+        activity.registerReceiver(mBecomingNoisyReceiver,
+                IntentFilter(AudioManager.ACTION_AUDIO_BECOMING_NOISY))
+        activity.registerReceiver(mHeadphonePluggedReceiver,
+                IntentFilter(Intent.ACTION_HEADSET_PLUG))
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        activity.unregisterReceiver(mBecomingNoisyReceiver)
+        activity.unregisterReceiver(mHeadphonePluggedReceiver)
+    }
+
+
+    fun measure() {
+        val wm: WindowManager = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager
+        val size: Point = Point()
+        wm.defaultDisplay.getSize(size)
+        rect = Rect(0,
+                (size.y * 0.2).toInt(),
+                size.x,
+                (size.y * 0.8).toInt())
+    }
+
     @OnClick(R.id.container)
     fun play() {
         mPresenter.playPause()
@@ -191,6 +247,7 @@ class PlayerFragment : Fragment(), PlayerContract.View {
         artist.setText("")
     }
 
+
     fun Drawable.toBitmap(): Bitmap {
         if (this is BitmapDrawable) {
             return bitmap
@@ -206,4 +263,5 @@ class PlayerFragment : Fragment(), PlayerContract.View {
         return bitmap
     }
 
+
 }

app/src/main/java/com/junnanhao/next/ui/player/PlayerPresenter.kt

@@ -1,5 +1,4 @@
 package com.junnanhao.next.ui.player
-
 import com.junnanhao.next.data.SongsRepository
 import com.junnanhao.next.data.model.Song
 import com.junnanhao.next.player.PlaybackCallback
@@ -37,13 +36,13 @@ class PlayerPresenter @Inject constructor(
         }
     }
 
+
     override fun scan() {
         mSongsRepository.scanMusic()
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe({ next() },
                         { throwable: Throwable? -> Timber.wtf(throwable) },
                         { scanned = true })
-
     }
 
     @Inject
@@ -55,6 +54,10 @@ class PlayerPresenter @Inject constructor(
         player.play()
     }
 
+    override fun duck() {
+        player.duck()
+    }
+
     override fun playPause() {
         if (player.isPlaying()) {
             pause()

app/src/main/res/values/strings.xml

@@ -9,4 +9,5 @@
     <string name="loading">Loading...</string>
     <string name="require_permission">Please grant permission</string>
     <string name="permission_reason">to scan local music files</string>
+    <string name="warning_cannot_get_audio_focus">Could not get audio focus</string>
 </resources>