When adding tracks to the library only 40 tracks are added initially. A background coroutine for adding the remainder of the tracks continues. The coroutine does not block the main thread. #43

app/src/main/java/com/example/mear/management/MusicFiles.kt

@@ -48,7 +48,7 @@ class MusicFiles (private val demoPath:  File) {
 
     fun searchForMp3Songs() {
         try {
-            var pathList: MutableList<String>? = null
+            var pathList: MutableList<String>?
             pathList = mutableListOf()
 
             var fileSearch = File(demoPath.absolutePath)
@@ -56,12 +56,13 @@ class MusicFiles (private val demoPath:  File) {
                 println(it.absolutePath)
                 if (!ignoreThisDirectory(it.absolutePath)) {
                     if (it.isFile) {
-                        if (it.extension.toString().equals(FileTypes.Mp3)) {
+                        if (it.extension == (FileTypes.Mp3)) {
                             pathList.add(it.absolutePath)
                         }
                     }
                 }
             }
+
             allSongs = pathList
         }
         catch (ex: Exception) {

app/src/main/java/com/example/mear/management/TrackManager.kt

@@ -3,7 +3,9 @@ package com.example.mear.management
 import android.content.Context
 import android.media.MediaMetadataRetriever
 
+import java.io.FileInputStream
 import java.lang.Exception
+import kotlinx.coroutines.*
 
 import com.example.mear.constants.Filenames
 import com.example.mear.constants.SongSearch
@@ -13,8 +15,17 @@ import com.example.mear.repositories.TrackRepository
 import com.example.mear.util.ConvertByteArray
 
 class TrackManager(var allSongPath: MutableList<String>) {
-    private var songCount: Int? = null
+
     private var allTracks: MutableList<Track>? = null
+    private var ctx: Context? = null
+    private var songCount: Int? = null
+    private var songIndex: Int? = null
+    private var moreSongs = true
+    var allTracksAdded = false
+
+    fun initializeContext(context: Context) {
+        ctx = context
+    }
 
     fun configureTracks(ctx: Context): Int {
         var id = 0
@@ -49,21 +60,57 @@ class TrackManager(var allSongPath: MutableList<String>) {
         TrackRepository(ctx).createSongCount(id)
         return id.dec()
     }
-    fun addTracks(ctx: Context) {
+    fun addTracks() {
         var initTracks = initialTracks()
-        addToDatabase(ctx, initTracks)
+        addToDatabase(initTracks)
-        TrackRepository(ctx).createSongCount(songCount!!)
+
+        if (moreSongs) {
+            GlobalScope.launch {
+                val remainingTracks = remainingTracks()
+                addToDatabase(remainingTracks)
+                allTracksAdded = true
+            }
+        }
     }
 
     private fun initialTracks(): MutableList<Track> {
         var tracks = mutableListOf<Track>()
+
         try {
-            for (i in 0.. (SongSearch.INITIAL_SEARCH_AMOUNT - 1)) {
+            var initSongSearch = SongSearch.INITIAL_SEARCH_AMOUNT -1
+
+            if (allSongPath!!.size < SongSearch.INITIAL_SEARCH_AMOUNT) {
+                initSongSearch = allSongPath.size
+                moreSongs = false
+            }
+
+            for (i in 0.. initSongSearch) {
                 var songPath = allSongPath[i]
                 val track = configureTrack(songPath, i)
                 tracks.add(track)
             }
+
             songCount = tracks.size
+            songIndex = songCount!!
+        }
+        catch (ex: Exception) {
+            val exMsg = ex.message
+        }
+
+        return tracks
+    }
+    private fun remainingTracks(): MutableList<Track> {
+        val tracks = mutableListOf<Track>()
+        try {
+            for (i in songIndex!! .. (allSongPath.size - 1)) {
+                val songPath = allSongPath[i]
+                val track = configureTrack(songPath, i)
+                if (track.id != Int.MAX_VALUE) {
+                    tracks.add(track)
+                }
+            }
+
+            songCount = songCount!!.plus(tracks.size)
         }
         catch (ex: Exception) {
             val exMsg = ex.message
@@ -73,17 +120,33 @@ class TrackManager(var allSongPath: MutableList<String>) {
     }
 
     private fun configureTrack(songPath: String, id: Int): Track {
+        try {
             val metaData = MediaMetadataRetriever()
-        metaData.setDataSource(songPath)
+            val fp = FileInputStream(songPath)
+            metaData.setDataSource(fp.fd)
 
             val title = metaData.extractMetadata(MediaMetadataRetriever.METADATA_KEY_TITLE)
             val artist = metaData.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST)
             val album = metaData.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM)
             val duration = (metaData.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION).toInt()) / 1000
 
+            fp.close()
+            metaData.release()
+
             return Track(id, title, artist, album, duration, ByteArray(0), songPath)
         }
+        catch (ex: Exception) {
+            val exMsg = ex.message
+        }
 
+        return Track()
+    }
+
+    private fun addToDatabase(tracks: List<Track>) {
+        TrackRepository(ctx!!).insertTracks(tracks)
+        PlayCountRepository(ctx!!).insertPlayCounts(tracks)
+        TrackRepository(ctx!!).createSongCount(songCount!!)
+    }
     private fun addToDatabase(ctx: Context, tracks: List<Track>) {
         TrackRepository(ctx).insertTracks(tracks)
         PlayCountRepository(ctx).insertPlayCounts(tracks)

app/src/main/java/com/example/mear/models/Track.kt

@@ -1,5 +1,6 @@
 package com.example.mear.models
 
-data class Track (val id: Int, val title: String, val artist: String, val album: String,
+data class Track (val id: Int = Int.MAX_VALUE, val title: String = "UNTITLED", val artist: String = "UNTITLED",
-             val length: Int, val TrackCover: ByteArray, val songPath: String) {
+                  val album: String = "UNTITLED", val length: Int = Int.MAX_VALUE,
+                  val TrackCover: ByteArray = ByteArray(0), val songPath: String = "UNTITLED") {
 }

app/src/main/java/com/example/mear/playback/service/MusicService.kt

@@ -27,6 +27,8 @@ class MusicService: Service() {
     }
 
     private var trackPlayer: MediaPlayer? = null
+    private var trackMgr: TrackManager? = null
+    private var currentTrack = Track()
     private var currentSongIndex: Int? = null
     private var shuffleOn: Boolean? = null
     private var repeatOn: Boolean? = null
@@ -70,12 +72,18 @@ class MusicService: Service() {
     }
 
     fun playTrack(id: Int) {
+        try {
             currentSongIndex = id
             trackPlayer!!.reset()
-        trackPlayer!!.setDataSource(TrackRepository(this).getTrack(id).songPath)
+            currentTrack = TrackRepository(this).getTrack(id)
+            trackPlayer!!.setDataSource(currentTrack.songPath)
             trackPlayer!!.prepare()
             trackPlayer!!.start()
         }
+        catch (ex: Exception) {
+            val exMsg = ex.message
+        }
+    }
 
     fun goToPosition(progress: Int) {
         trackPlayer!!.seekTo(progress)
@@ -102,14 +110,15 @@ class MusicService: Service() {
             shuffleOn = retrieveShuffleMode()
             trackPlayer!!.reset()
             if (duration > seconds) {
-                trackPlayer!!.setDataSource(TrackRepository(this).getTrack(currentSongIndex!!).songPath)
+                currentTrack = TrackRepository(this).getTrack(currentSongIndex!!)
+                trackPlayer!!.setDataSource(currentTrack.songPath)
                 trackPlayer!!.prepare()
                 trackPlayer!!.start()
             }
             else {
                 val previousTrackNumber = fetchSongIndex(PlayTypes.PlayPreviousSong)
-                val track = TrackRepository(this).getTrack(previousTrackNumber)
+                currentTrack = TrackRepository(this).getTrack(previousTrackNumber)
-                trackPlayer!!.setDataSource(track.songPath)
+                trackPlayer!!.setDataSource(currentTrack.songPath)
                 trackPlayer!!.prepare()
                 trackPlayer!!.start()
             }
@@ -123,8 +132,9 @@ class MusicService: Service() {
             trackPlayer!!.reset()
             shuffleOn = retrieveShuffleMode()
             var nextTrack = fetchSongIndex(PlayTypes.PlayNextSong)
-            val track = TrackRepository(this).getTrack(nextTrack)
+            val allTracks = TrackRepository(this).getAll()
-            trackPlayer!!.setDataSource(track.songPath)
+            currentTrack = TrackRepository(this).getTrack(nextTrack)
+            trackPlayer!!.setDataSource(currentTrack.songPath)
             trackPlayer!!.prepare()
             trackPlayer!!.start()
         }
@@ -180,16 +190,8 @@ class MusicService: Service() {
     }
 
     fun getCurrentTrack(): Track {
-        var track: Track? = null
 
-        track = TrackRepository(this).getTrack(currentSongIndex!!)
+        return currentTrack
-        val info = trackPlayer!!.trackInfo
-
-        if (trackPlayer!!.isPlaying) {
-            val res = "songs are being played"
-        }
-
-        return track!!
     }
 
 
@@ -266,8 +268,8 @@ class MusicService: Service() {
             }
 
             currentSongIndex = Random.nextInt(0, TrackRepository(this).getSongCount())
-            val trackToPlay = TrackRepository(this).getTrack(currentSongIndex!!)
+            currentTrack = TrackRepository(this).getTrack(currentSongIndex!!)
-            trackPlayer!!.setDataSource(trackToPlay.songPath)
+            trackPlayer!!.setDataSource(currentTrack.songPath)
             trackPlayer!!.prepareAsync()
             trackPlayer!!.setOnCompletionListener {
                 playNextTrack()
@@ -281,8 +283,9 @@ class MusicService: Service() {
         var mp3Paths = MusicFiles(android.os.Environment.getExternalStorageDirectory())
         mp3Paths.searchForMp3Songs()
         val paths = mp3Paths.allSongs
-        val trackMgr = TrackManager(paths!!)
+        trackMgr = TrackManager(paths!!)
-        trackMgr.addTracks(this)
+        trackMgr!!.initializeContext(this)
+        trackMgr!!.addTracks()
         initializeShuffleMode()
         initializeRepeatMode()
     }
@@ -375,11 +378,8 @@ class MusicService: Service() {
 
         try {
             val count = TrackRepository(this).getSongCount()
-            TrackRepository(this).delete()
 
-            // TODO: Replace this with the local count varialbe when issue #43 is resolved
+            return count
-            // as well as remove the call to delete the Track table
-            return 0
         }
         catch (ex: Exception) {
             val exMsg = ex.message