Update sharedpreference that uses checkbox

I want to update the changes when I uncheck and check the checkbox in the preference activity but when I press the back button it doesn't work. It only works when I close the activity and then open it

Main activity

public class MainActivity extends ActionBarActivity   {
 private ToggleButton togle;
 private Camera camera;
    private boolean isFlashOn;
    private boolean hasFlash;
    Parameters params;
    private ShakeListener mShaker;
    MediaPlayer mp;
    ImageView anime;
    int p=1; 
@Override
protected void onCreate(Bundle savedInstanceState) {


    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    anime = (ImageView) findViewById(R.id.Animation);

    hasFlash = getApplicationContext().getPackageManager()
            .hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);

    if (!hasFlash) {
        // device doesn't support flash
        // Show alert message and close the application
        AlertDialog alert = new AlertDialog.Builder(MainActivity.this)
                .create();
        alert.setTitle("Error");
        alert.setMessage("Sorry, your device doesn't support flash light!");
        alert.setButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                // closing the application
                finish();   }
        });
        alert.show();
        return;}


    getCamera();


    togle = (ToggleButton) findViewById(R.id.ToggleButton01);

    togle.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
        // TODO Auto-generated method stub
              boolean checked = ((ToggleButton) v).isChecked();
               if (checked){
                   turnOffFlash();
              }

               else{
                   getCamera();
                   turnOnFlash(); 
               }
                  }
        });


    SharedPreferences getprefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
    boolean stopshake = getprefs.getBoolean("checkbox", true);
    if (stopshake == true ){

    mShaker = new ShakeListener(this); 
    mShaker.setOnShakeListener(new ShakeListener.OnShakeListener () {
         public void onShake()
         { if (!isFlashOn) {
             Toast.makeText(MainActivity.this, "On" , Toast.LENGTH_SHORT).show();

             getCamera();
         turnOnFlash();
         }
         else{
               turnOffFlash();

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


    }

private void getCamera() {
    // TODO Auto-generated method stub
    if (camera == null) {
        try {
            camera = Camera.open();
            params = camera.getParameters();
        } catch (RuntimeException e) {
            Log.e("Camera Error. Failed to Open. Error: ", e.getMessage());
        }
    } }

private void turnOnFlash() {
    if (!isFlashOn) {
        if (camera == null || params == null) {
            return;
        }
        // play sound
        getCamera();
        playSound();

        params = camera.getParameters();
        params.setFlashMode(Parameters.FLASH_MODE_TORCH);
        camera.setParameters(params);
        camera.startPreview();
        isFlashOn = true;
        anime.setImageResource(R.drawable.anim);
        anime.post(new Runnable() {
            @Override
            public void run() {
                AnimationDrawable frameAnimation =
                    (AnimationDrawable) anime.getDrawable(); 
                frameAnimation.start();
            }
        });

        // changing button/switch image
    }
  }

 private void turnOffFlash() {
        if (isFlashOn) {
            if (camera == null || params == null) {
                return;
            }
            // play sound
            playSound();

            params = camera.getParameters();
            params.setFlashMode(Parameters.FLASH_MODE_OFF);
            camera.setParameters(params);
            camera.stopPreview();
            camera.setPreviewCallback(null);
            camera.release();
            camera = null;
            isFlashOn = false;
            anime.setImageResource(R.drawable.off);
            // changing button/switch image
        }
    }

private void playSound() {
    // TODO Auto-generated method stub
     if(isFlashOn){
            mp = MediaPlayer.create(MainActivity.this, R.raw.off1);
        }else{
            mp = MediaPlayer.create(MainActivity.this, R.raw.on1);
        }
        mp.setOnCompletionListener(new OnCompletionListener() {

            @Override
            public void onCompletion(MediaPlayer mp) {
                // TODO Auto-generated method stub
                mp.release();
            }
        }); 
        mp.start();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        Intent intent = new Intent(MainActivity.this, Prefsetting.class);
        startActivity(intent);
        return true;
    }
    return super.onOptionsItemSelected(item);
}

 }

Preference activity

public class Prefsetting extends PreferenceActivity   {

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
  addPreferencesFromResource(R.xml.prefset);

}

  }