Play mp3 file from raw folder

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/root"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:text="Now Playing..."
  />
  <ImageView
    android:id="@+id/coverImage"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:scaleType="centerInside"
  />
</LinearLayout>

package com.java2s.myapplication3.app;
//w w  w.  j a va  2  s  .c  o m
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity implements MediaPlayer.OnCompletionListener {

    Button mPlay;
    MediaPlayer mPlayer;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mPlay = new Button(this);
        mPlay.setText("Play Sound");
        mPlay.setOnClickListener(playListener);

        setContentView(R.layout.activity_main);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if(mPlayer != null) {
            mPlayer.release();
        }
    }

    private View.OnClickListener playListener = new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            if(mPlayer == null) {
                try {
                    mPlayer = MediaPlayer.create(MainActivity.this, R.raw.sound);
                    mPlayer.start();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } else {
                mPlayer.stop();
                mPlayer.release();
                mPlayer = null;
            }
        }
    };

    @Override
    public void onCompletion(MediaPlayer mp) {
        mPlayer.release();
        mPlayer = null;
    }

}