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MediaPlayer class to implement a basic Audio Player in an Android Kotlin app?
This example demonstrates how to implement a MediaPlayer class to implement a basic Audio Player in an Android Kotlin app.
Step 1 − Create a new project in Android Studio, go to File ⇉ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="10dp" android:paddingRight="10dp"> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:text="Now Playing: " android:textAppearance="?android:attr/textAppearanceMedium" android:textColor="@android:color/holo_red_dark" android:textSize="16sp" android:textStyle="bold|italic" /> <TextView android:id="@+id/txtSongName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/textView" android:layout_toEndOf="@+id/textView" android:textColor="@android:color/background_dark" android:textSize="16sp" android:textStyle="bold|italic" /> <ImageButton android:id="@+id/btnBackward" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:src="@drawable/ic_back" /> <ImageButton android:id="@+id/btnPlay" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@+id/btnBackward" android:layout_marginStart="10dp" android:layout_toEndOf="@+id/btnBackward" android:src="@drawable/ic_play" /> <ImageButton android:id="@+id/btnPause" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@+id/btnPlay" android:layout_marginStart="10dp" android:layout_toEndOf="@+id/btnPlay" android:src="@drawable/ic_pause" /> <ImageButton android:id="@+id/btnForward" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@+id/btnPause" android:layout_marginStart="10dp" android:layout_toEndOf="@+id/btnPause" android:contentDescription="@+id/imageButton3" android:src="@drawable/ic_forward" /> <TextView android:id="@+id/txtStartTime" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@+id/seekBar" android:text="0 min, 0 sec" /> <SeekBar android:id="@+id/seekBar" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_above="@+id/btnBackward" android:layout_toStartOf="@+id/txtSongTime" android:layout_toEndOf="@+id/txtStartTime" /> <TextView android:id="@+id/txtSongTime" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@+id/seekBar" android:layout_toEndOf="@+id/btnForward" android:text="0 min, 0 sec " /> </RelativeLayout>
Step 3 − Add the following code to MainActivity.kt
import android.media.MediaPlayer
import android.os.Bundle
import android.os.Handler
import android.widget.ImageButton
import android.widget.SeekBar
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*
import java.util.concurrent.TimeUnit
class MainActivity : AppCompatActivity() {
lateinit var forwardBtn: ImageButton
lateinit var backwardBtn: ImageButton
lateinit var pauseBtn: ImageButton
lateinit var playBtn: ImageButton
lateinit var mediaPlayer: MediaPlayer
private lateinit var songName: TextView
private lateinit var startTime: TextView
private lateinit var songTime: TextView
private lateinit var seekBar: SeekBar
private var handler: Handler = Handler()
private var onTime: Int = 0
private var playTime: Int = 0
private var endTime: Int = 0
private var forwardTime: Int = 5000
private var backwardTime: Int = 5000
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
title = "KotlinApp"
backwardBtn = findViewById(R.id.btnBackward)
forwardBtn = findViewById(R.id.btnForward)
playBtn = findViewById(R.id.btnPlay)
pauseBtn = findViewById(R.id.btnPause)
songName = findViewById(R.id.txtSongName)
startTime = findViewById(R.id.txtStartTime)
songTime = findViewById(R.id.txtSongTime)
songName.text = "SpeakerBox - Fast & Furious"
mediaPlayer = MediaPlayer.create(this, R.raw.fast_and_furious)
seekBar = findViewById(R.id.seekBar)
seekBar.isClickable = false
pauseBtn.isEnabled = true
playBtn.setOnClickListener {
Toast.makeText(this, "Playing Audio", Toast.LENGTH_SHORT).show()
mediaPlayer.start()
endTime = mediaPlayer.duration
playTime = mediaPlayer.currentPosition
seekBar.max = endTime
onTime = 1
songTime.text = String.format(
"%d min, %d sec",
TimeUnit.MILLISECONDS.toMinutes(endTime.toLong()),
TimeUnit.MILLISECONDS.toSeconds(endTime.toLong()) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(endTime.toLong()))
)
startTime.text = String.format(
"%d min, %d sec",
TimeUnit.MILLISECONDS.toMinutes(playTime.toLong()),
TimeUnit.MILLISECONDS.toSeconds(playTime.toLong()) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(playTime.toLong()))
)
seekBar.progress = playTime
handler.postDelayed(updateSongTime, 100)
pauseBtn.isEnabled = true
playBtn.isEnabled = false
}
btnPause.setOnClickListener {
mediaPlayer.pause()
pauseBtn.isEnabled = false
playBtn.isEnabled = true
Toast.makeText(applicationContext, "Audio Paused", Toast.LENGTH_SHORT).show()
}
btnForward.setOnClickListener {
if ((playTime + forwardTime) <= endTime) {
playTime += forwardTime
mediaPlayer.seekTo(playTime)
}
else {
Toast.makeText(
applicationContext,
"Cannot jump forward 5 seconds",
Toast.LENGTH_SHORT
).show()
}
if (!playBtn.isEnabled) {
playBtn.isEnabled = true
}
}
btnBackward.setOnClickListener {
if ((playTime - backwardTime) > 0) {
playTime -= backwardTime
mediaPlayer.seekTo(playTime)
}
else {
Toast.makeText(
applicationContext,
"Cannot jump backward 5 seconds",
Toast.LENGTH_SHORT
).show()
}
if (!playBtn.isEnabled) {
playBtn.isEnabled = true
}
}
}
private val updateSongTime = object : Runnable {
override fun run() {
playTime = mediaPlayer.currentPosition
startTime.text = String.format(
"%d min, %d sec", TimeUnit.MILLISECONDS.toMinutes(playTime.toLong()
(TimeUnit.MILLISECONDS.toSeconds(playTime.toLong()) - TimeUnit.MINUTES.toSeconds
(TimeUnit.MILLISECONDS.toMinutes(
playTime.toLong()
)
))
)
seekBar.progress = playTime
handler.postDelayed(this, 100)
}
}
}Step 4 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.kotlipapp"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run 
icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
Click here to download the project code.
Updated on: 21-Apr-2020
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