[ExoPlayer] 🎵 Demo using exo player to modif speed and pitch

app/build.gradle

@@ -31,8 +31,10 @@ dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation project(":soundsystem")
 
-    implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
+    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
     implementation "com.android.support:appcompat-v7:$support_version"
+    implementation "com.android.support:cardview-v7:$support_version"
+    implementation "com.android.support:design:$support_version"
 
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.1'

app/src/main/java/com/mercandalli/android/apps/theremin/MainActivity.kt

@@ -3,11 +3,17 @@ package com.mercandalli.android.apps.theremin
 import android.support.v7.app.AppCompatActivity
 import android.os.Bundle
 import android.widget.SeekBar
+import android.widget.TextView
 import com.mercandalli.android.sdk.soundsystem.ThereminManager
 
 class MainActivity : AppCompatActivity() {
 
     private lateinit var thereminManager: ThereminManager
+    private val thereminListener = createThereminListener()
+    private lateinit var distanceTextView: TextView
+    private lateinit var distanceSeekBar: SeekBar
+    private lateinit var speedTextView: TextView
+    private lateinit var speedSeekBar: SeekBar
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -16,7 +22,9 @@ class MainActivity : AppCompatActivity() {
         Graph.init(this)
         thereminManager = Graph.thereminManager
 
-        findViewById<SeekBar>(R.id.activity_main_seekbar_distance).setOnSeekBarChangeListener(
+        distanceTextView = findViewById(R.id.activity_main_distance_text)
+        distanceSeekBar = findViewById(R.id.activity_main_distance_seekbar)
+        distanceSeekBar.setOnSeekBarChangeListener(
                 object : SeekBar.OnSeekBarChangeListener {
                     override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
                         syncSeekbar(seekBar!!)
@@ -30,10 +38,35 @@ class MainActivity : AppCompatActivity() {
                         syncSeekbar(seekBar!!)
                     }
                 })
+        speedTextView = findViewById(R.id.activity_main_speed_text)
+        speedSeekBar = findViewById(R.id.activity_main_speed_seekbar)
+
+        thereminManager.registerThereminListener(thereminListener)
+        syncSpeedAndPitchUI()
     }
 
     private fun syncSeekbar(seekBar: SeekBar) {
-        val distance = seekBar.progress
-        thereminManager.onDistanceChanged(distance)
+        val distanceInt = seekBar.progress
+        distanceTextView.text = if (distanceInt >= 100) "Distance: >100 cm" else "Distance: $distanceInt cm"
+        distanceSeekBar.progress = distanceInt
+        thereminManager.onDistanceChanged(distanceInt)
+    }
+
+    private fun createThereminListener(): ThereminManager.ThereminListener {
+        return object : ThereminManager.ThereminListener {
+            override fun onPitchChanged() {
+                syncSpeedAndPitchUI()
+            }
+
+            override fun onSpeedChanged() {
+                syncSpeedAndPitchUI()
+            }
+        }
+    }
+
+    private fun syncSpeedAndPitchUI() {
+        val speed = (thereminManager.getSpeed() * 100f).toInt()
+        speedTextView.text = "Speed: $speed %"
+        speedSeekBar.progress = speed
     }
 }

app/src/main/res/layout/activity_main.xml

@@ -1,22 +1,125 @@
 <?xml version="1.0" encoding="utf-8"?>
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
     <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_gravity="center"
-        android:orientation="vertical">
+        android:layout_height="match_parent"
+        android:background="#1e1e1e"
+        android:orientation="vertical"
+        android:paddingTop="2dp">
 
-        <SeekBar
-            android:id="@+id/activity_main_seekbar_distance"
-            android:layout_width="match_parent"
+        <android.support.v7.widget.CardView
+            android:layout_width="280dp"
             android:layout_height="wrap_content"
-            android:layout_margin="20dp"
-            android:max="100" />
+            android:layout_marginBottom="0dp"
+            android:layout_marginEnd="16dp"
+            android:layout_marginStart="16dp"
+            android:layout_marginTop="16dp"
+            app:cardBackgroundColor="#404040"
+            app:cardCornerRadius="8dp">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:orientation="vertical"
+                android:padding="@dimen/default_space_1_5">
+
+                <TextView
+                    android:id="@+id/activity_main_distance_text"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:gravity="center_horizontal"
+                    android:text="Distance: 100 cm"
+                    android:textColor="#e6e6e6"
+                    android:textSize="@dimen/text_size_xxl" />
+
+                <android.support.v7.widget.AppCompatSeekBar
+                    android:id="@+id/activity_main_distance_seekbar"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="@dimen/default_space"
+                    android:max="100" />
+
+            </LinearLayout>
+
+        </android.support.v7.widget.CardView>
+
+        <android.support.v7.widget.CardView
+            android:layout_width="280dp"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="0dp"
+            android:layout_marginEnd="16dp"
+            android:layout_marginStart="16dp"
+            android:layout_marginTop="16dp"
+            app:cardBackgroundColor="#404040"
+            app:cardCornerRadius="8dp">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:orientation="vertical"
+                android:padding="@dimen/default_space_1_5">
+
+                <TextView
+                    android:id="@+id/activity_main_speed_text"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:gravity="center_horizontal"
+                    android:text="Speed: 100 %"
+                    android:textColor="#e6e6e6"
+                    android:textSize="@dimen/text_size_xxl" />
+
+                <android.support.v7.widget.AppCompatSeekBar
+                    android:id="@+id/activity_main_speed_seekbar"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="@dimen/default_space"
+                    android:max="150" />
+
+            </LinearLayout>
+
+        </android.support.v7.widget.CardView>
+
+        <android.support.v7.widget.CardView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="0dp"
+            android:layout_marginEnd="16dp"
+            android:layout_marginStart="16dp"
+            android:layout_marginTop="16dp"
+            app:cardBackgroundColor="#404040"
+            app:cardCornerRadius="8dp">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:orientation="vertical"
+                android:padding="@dimen/default_space_1_5">
+
+                <TextView
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:gravity="center_horizontal"
+                    android:text="Mode"
+                    android:textColor="#e6e6e6"
+                    android:textSize="@dimen/text_size_xl" />
+
+                <TextView
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:gravity="center_horizontal"
+                    android:text="Shape of U"
+                    android:textColor="#b0b0b0"
+                    android:textSize="@dimen/text_size_l" />
+
+            </LinearLayout>
+
+        </android.support.v7.widget.CardView>
 
     </LinearLayout>
 

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

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <dimen name="toolbar_height">52dp</dimen>
+    <dimen name="toolbar_height_2">104dp</dimen>
+
+    <!-- Default values -->
+    <dimen name="default_space_quart">2dp</dimen>
+    <dimen name="default_space_half">4dp</dimen>
+    <dimen name="default_space">8dp</dimen>
+    <dimen name="default_space_1_5">16dp</dimen>
+    <dimen name="default_space_2">24dp</dimen>
+    <dimen name="default_space_3">32dp</dimen>
+    <dimen name="default_space_4">40dp</dimen>
+    <dimen name="default_space_5">48dp</dimen>
+    <dimen name="default_radius">2dp</dimen>
+    <dimen name="default_radius_2">4dp</dimen>
+
+    <dimen name="text_size_xs">10sp</dimen>
+    <dimen name="text_size_s">11sp</dimen>
+    <dimen name="text_size_m">12sp</dimen>
+    <dimen name="text_size_l">14sp</dimen>
+    <dimen name="text_size_l_5">16sp</dimen>
+    <dimen name="text_size_xl">18sp</dimen>
+    <dimen name="text_size_xxl">22sp</dimen>
+    <dimen name="text_size_xxxl">26sp</dimen>
+</resources>

build.gradle

@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.2.31'
+    ext.kotlin_version = '1.2.40'
     ext.kotlin_coroutines_version = '0.22.5'
     ext.support_version = '27.1.1'
     repositories {

soundsystem/build.gradle

@@ -33,5 +33,6 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation "com.google.android.exoplayer:exoplayer-core:r2.4.4"
 }

soundsystem/src/main/java/com/mercandalli/android/sdk/soundsystem/Player.kt

@@ -0,0 +1,63 @@
+package com.mercandalli.android.sdk.soundsystem
+
+interface Player {
+
+    val audioSessionId: Int
+
+    val isPlaying: Boolean
+
+    val duration: Long
+
+    val currentPosition: Int
+
+    fun load(path: String)
+
+    fun play()
+
+    fun pause()
+
+    fun stop()
+
+    fun release()
+
+    fun getPitch():Float
+
+    fun getSpeed():Float
+
+    /**
+     * Sets the audio volume, with 0 being silence and 1 being unity gain.
+     *
+     * @param volume The audio volume.
+     */
+    fun setVolume(volume: Float)
+
+    /**
+     * The factor by which playback will be sped up.
+     */
+    fun setSpeed(speed: Float)
+
+    /**
+     * The factor by which the audio pitch will be scaled.
+     */
+    fun setPitch(pitch: Float)
+
+    fun seekTo(ms: Long)
+
+    fun registerListener(listener: PlayerListener)
+
+    fun unregisterListener(listener: PlayerListener)
+
+    interface PlayerListener {
+
+        fun onComplete(player: Player)
+
+        fun onPrepare(player: Player)
+
+        fun onError(player: Player)
+
+        fun onBufferingStart(player: Player)
+
+        fun onBufferingComplete(player: Player)
+    }
+
+}

soundsystem/src/main/java/com/mercandalli/android/sdk/soundsystem/PlayerProvider.kt

@@ -0,0 +1,29 @@
+package com.mercandalli.android.sdk.soundsystem
+
+import android.content.Context
+import com.google.android.exoplayer2.DefaultRenderersFactory
+import com.google.android.exoplayer2.ExoPlayerFactory
+import com.google.android.exoplayer2.trackselection.DefaultTrackSelector
+import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory
+import com.google.android.exoplayer2.util.Util
+
+class PlayerProvider {
+    companion object {
+
+        @JvmStatic
+        fun create(context: Context): Player {
+            val renderersFactory = DefaultRenderersFactory(
+                    context,
+                    null,
+                    DefaultRenderersFactory.EXTENSION_RENDERER_MODE_OFF)
+            val simpleExoPlayer = ExoPlayerFactory.newSimpleInstance(renderersFactory, DefaultTrackSelector())
+            val dataSourceFactory = DefaultDataSourceFactory(
+                    context,
+                    Util.getUserAgent(context, "MusicPlayer"))
+            return SimpleExoPlayerWrapper(
+                    simpleExoPlayer,
+                    dataSourceFactory)
+        }
+    }
+
+}