Android : How to mute the android app using toggle button in android?

I am using toggle button for mute and unmute the app sounds .When mute button is pressed I want to mute all the sounds in app.I am using media player for playing sounds .How to mute and unmute the media player using toggle button.

Here is my code ,

mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.tone_uyir_mei_ezhuthukal);
                mediaPlayer.start();




toggleButton=(ToggleButton) findViewById(R.id.toggleButton1);                               
        toggleButton.setOnClickListener(new OnClickListener() {         
            @Override
            public void onClick(View arg0) {
                StringBuffer result = new StringBuffer();
                   result.append(toggleButton.getText());                        
                   Toast.makeText(HomeScreen.this, result.toString(),
                    Toast.LENGTH_SHORT).show();     
                   if (result.equals("volume")) {

                }else {

                }

            }
        });

I did not know how to proceed .Need help to mute and unmute the app using this toggle button