A newbie in Android development comes across Media player usage in his/her project. So in this blog, I am here to tell you the basic of media player. One can use android inbuilt media player or can customize media player according to the need.

Here i am using inbuilt Media player to start with,

In your XML,copy the following code:

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:text="Music Player"
        android:textSize="35dp" />


    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textview"
        android:layout_centerHorizontal="true"
        android:src="@drawable/icon_all_post" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:text=">>"
        android:visibility="invisible" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button"
        android:layout_alignParentBottom="true"
        android:layout_alignStart="@+id/imageView"
        android:text="Pause" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/button2"
        android:layout_toEndOf="@+id/button2"
        android:layout_toRightOf="@+id/button2"
        android:text="play" />

    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/button"
        android:layout_alignEnd="@+id/textview"
        android:layout_alignLeft="@+id/textview"
        android:layout_alignRight="@+id/textview"
        android:layout_alignStart="@+id/textview" />

    <TextView
        android:id="@+id/totalTimeOfSongText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/seekBar"
        android:text="Small Text"
        android:textAppearance="?android:attr/textAppearanceSmall" />

    <TextView
        android:id="@+id/timeUpdateText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/seekBar"
        android:layout_alignParentRight="true"
        android:layout_toRightOf="@+id/songNameText"
        android:gravity="end"
        android:text="Small Text"
        android:textAppearance="?android:attr/textAppearanceSmall" />

    <TextView
        android:id="@+id/songNameText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/totalTimeOfSongText"
        android:layout_alignBottom="@+id/totalTimeOfSongText"
        android:layout_centerHorizontal="true"
        android:text="Medium Text"
        android:textAppearance="?android:attr/textAppearanceMedium" />

</RelativeLayout>

In this XML, I am having play, pause button,Seekbar,and three text view.

Before going to java file,you must add folder name raw inside res directory of your project.After adding raw folder,copy +paste a song in raw folder created.Rebuild your project and you can see raw folder inside res directory in your project.

Now java file,MainActivity.java

private static final String KEY_SEEK_PROGRESS = "key_progress";
private MediaPlayer mediaPlayer;
private Button pause, play;
private TextView totalTimeOfSongText, timeUpdateText, songNameText;
private SeekBar seekbar;
private double startTime = 0;
private Handler myHandler = new Handler();
private int seekProgress = 0;

In onCreate method of your activity,initialize all the buttons and text view

pause = (Button) findViewById(R.id.button2);
play = (Button) findViewById(R.id.button3);
totalTimeOfSongText = (TextView) findViewById(R.id.totalTimeOfSongText);
timeUpdateText = (TextView) findViewById(R.id.timeUpdateText);
songNameText = (TextView) findViewById(R.id.songNameText);

Add the following code in onResume of your activity,

myHandler.post(UpdateSongTime);

if (mediaPlayer != null && mediaPlayer.isPlaying()) {
    play.setEnabled(false);
    pause.setEnabled(true);
    mediaPlayer.start();
} else {
    pause.setEnabled(false);
    mediaPlayer = MediaPlayer.create(this, R.raw.song);
}

songNameText.setText("Song.mp3");
seekbar = (SeekBar) findViewById(R.id.seekBar);
seekbar.setClickable(false);

seekbar.setMax(mediaPlayer.getDuration());
totalTimeOfSongText.setText(String.format("%d min, %d sec",
        TimeUnit.MILLISECONDS.toMinutes((long) mediaPlayer.getDuration()),
        TimeUnit.MILLISECONDS.toSeconds((long) mediaPlayer.getDuration()) -
                TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) mediaPlayer.getDuration()))));


play.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        if (!mediaPlayer.isPlaying()) {

            Toast.makeText(MainActivity.this, "Playing", Toast.LENGTH_SHORT).show();

            if (seekProgress != 0) {
                mediaPlayer.seekTo(seekProgress);
                mediaPlayer.start();
            } else {
                mediaPlayer.start();
            }

        } else {

            Toast.makeText(MainActivity.this, "already playing", Toast.LENGTH_SHORT).show();
        }

        pause.setEnabled(true);

    }
});

pause.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        Toast.makeText(MainActivity.this, "stopped at" + mediaPlayer.getCurrentPosition(), Toast.LENGTH_SHORT).show();
        mediaPlayer.pause();

    }
});

mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
    @Override
    public void onCompletion(MediaPlayer mp) {
        timeUpdateText.setText("0 min,0sec");
        mp.start();
    }
});

private Runnable UpdateSongTime = new Runnable() {
    @SuppressLint("DefaultLocale")
    public void run() {
        startTime = mediaPlayer.getCurrentPosition();
        timeUpdateText.setText(String.format("%d min, %d sec",

                TimeUnit.MILLISECONDS.toMinutes((long) startTime),
                TimeUnit.MILLISECONDS.toSeconds((long) startTime) -
                        TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.
                                toMinutes((long) startTime)))
        );
        seekbar.setProgress((int) startTime);
        myHandler.postDelayed(this, 100);
    }

};

That's all.Media player is ready and you can run your project and enjoy music :)