Could you please help me on this Android Audio Problem: I did some but doesn't work. I did somthing wrong, please help me. I relly appreciate your help.

activity_main.xml

<RelativeLayout xmlns:androclass="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/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_marginTop="30dp" android:text="Audio Controller" /> <Button android:id="@+id/button1" style="?android:attr/buttonStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView1" android:layout_below="@+id/textView1" android:layout_marginTop="48dp" android:text="start" /> <Button android:id="@+id/button2" style="?android:attr/buttonStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@+id/button1" android:layout_toRightOf="@+id/button1" android:text="pause" /> <Button android:id="@+id/button3" style="?android:attr/buttonStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@+id/button2" android:layout_toRightOf="@+id/button2" android:text="stop" />

RelativeLayout>

MainActivity.java

package com.example.nilanthi.myapplication; import android.app.Activity; import android.media.MediaPlayer; import android.os.Bundle; import android.os.Environment; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; public class MainActivity extends Activity { Button start,pause,stop; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); start=(Button)findViewById(R.id.button1); pause=(Button)findViewById(R.id.button2); stop=(Button)findViewById(R.id.button3); //creating media player final MediaPlayer mp=new MediaPlayer(); try{ //you can change the path, here path is external directory(e.g. sdcard) /Music/maine.mp3 mp.setDataSource(Environment.getExternalStorageDirectory().getPath()+"C:\\Users\\DAbey\\Desktop\\nilanthi\\IVYtech\\Fall-2017-Courcess\\SDEV264-Mobile-Application\\MyApplication3\\every breath you take; mp.prepare(); }catch(Exception e){e.printStackTrace();} start.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mp.start(); } }); pause.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mp.pause(); } }); stop.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mp.stop(); } }); } }