listening Class

public class Listening extends AppCompatActivity {
    MediaPlayer oursong;
    boolean bool = false;
    private SeekBar mSeekBarVolume;
    SharedPreferences sp;
    enum State{
        Retrieving,
        Stopped,
        Preparing,
        Playing,
        Paused
    };
    State mState = State.Retrieving;
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.listening);
        ToggleButton toggle = (ToggleButton) findViewById(R.id.toggleButton);
        toggle.setBackgroundColor(Color.parseColor("#26A69A"));
        Intent ourintent = getIntent();
        int dek1 = ourintent.getIntExtra("dek", 0);
        sp = getSharedPreferences("sp",0);
        final boolean myBoolean = sp.getBoolean("Myboolen",false);
        if(myBoolean==true){
            toggle.setChecked(true);
        }
        ImageView img = (ImageView) findViewById(R.id.imageView3);
        if(myBoolean!=true){
        if (dek1 == 1) {
            img.setImageResource(R.drawable.a);
            oursong = MediaPlayer.create(Listening.this, R.raw.a);
        } else if (dek1 == 2) {
            img.setImageResource(R.drawable.b);
            oursong = MediaPlayer.create(Listening.this, R.raw.b);
        } else if (dek1 == 3) {
            img.setImageResource(R.drawable.c);
            oursong = MediaPlayer.create(Listening.this, R.raw.c);
        }}

        FrameLayout Frame = (FrameLayout) findViewById(R.id.frame);
        Frame.setBackgroundColor(Color.parseColor("#26A69A"));
        SeekBar seekbar = (SeekBar)findViewById(R.id.seekbar); // make seekbar object
        seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onStopTrackingTouch(SeekBar arg0) {
            }

            @Override
            public void onStartTrackingTouch(SeekBar arg0) {

            }

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {
                float volume = (float) (1 - (Math.log(100 - progress) / Math.log(100)));
                oursong.setVolume(volume, volume);
            }});



        toggle.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    if(myBoolean!=true){
                        oursong.start();
                        bool=true;
                        mState = State.Playing;}else if(myBoolean==true){
                        }
                    } else {
                        if(oursong.isPlaying()){
                            oursong.stop();
                            oursong.release();

                        }
                        if(myBoolean==true){
                            oursong.stop();
                            oursong.release();
                        }

                }
            }

        });
    }


    public void onPause() {
        super.onPause();
        try{
            SharedPreferences.Editor editor = sp.edit();
            editor.putBoolean("Myboolen",bool);
            editor.commit();
        }catch (Exception e){e.printStackTrace();}
    }