Flashlight App - Facing Orientation Problem

when i press button in potrait mode Flash light is goes on and when I rotate to landscape mode flash light goes off..

Plz help me to solve this issue..

package com.example.admin.finalflash;

import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;

public class MainActivity extends AppCompatActivity {

ImageButton imagebuttonon, imagebuttonoff;
public static Camera cmr;
Camera.Parameters parameters;

boolean isFlash = false;
boolean isOn = false;





@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    imagebuttonoff = (ImageButton) findViewById(R.id.imagebuttonoff);
    if (getApplicationContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH))

    {

        cmr = Camera.open();
        parameters = cmr.getParameters();
        isFlash = true;

    }


    //setting onclicklistner on off ie red imagebutton..
    imagebuttonoff.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (isFlash)
            // if your mobile support flash light

            {


                //if flash light is not on
                if (!isOn) {

                    imagebuttonoff.setImageResource(R.drawable.onswitch); //replace offswitch image with onswitch image.
                    parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);//also set on flash torch parameter..
                    cmr.setParameters(parameters);//by using object  cmr.
                    cmr.startPreview();
                    isOn = true;// now flashlight is on..ie true


                } else {

//exactly opposite as above ie as switch on..ie how to off flash light..
imagebuttonoff.setImageResource(R.drawable.offswitch);
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
cmr.setParameters(parameters);
cmr.stopPreview();
isOn = false; // now flash light is off..

                }
            } else { // if your mobile does not support flash light..

                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("Error"); // this will set title for error message...
                builder.setMessage("Flash light not available"); // will display message
                builder.setPositiveButton("ok", new DialogInterface.OnClickListener() {//so that you can click on "ok"..
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss(); // so application is dismiss
                        finish();
                    }
                });


                AlertDialog alertDialog = builder.create(); //this will shows dialog box..which is showing above error message..
                alertDialog.show();

            }

        }
    });


}


@Override
protected void onDestroy() {
    super.onDestroy();
}

@Override
protected void onPause() {
    super.onPause();

    // on pause turn off the flash
    cmr.stopPreview();
}

@Override
protected void onRestart() {
    super.onRestart();
}

@Override
protected void onResume() {
    super.onResume();

    // on resume turn on the flash
    if (isOn)
        cmr.startPreview();
}

@Override
protected void onStart() {
    super.onStart();

    // on starting the app get the camera params
    cmr.startPreview();
}


@Override
protected void onStop() { // this will stop out flash light..
    super.onStop();
    if (cmr != null)

        cmr.release();
    cmr = null;

}

@Override
protected void onSaveInstanceState(Bundle outState) {
    //outState.getBoolean("mode", false);
    super.onSaveInstanceState(outState);
    outState.putBoolean("mode", isOn);

       }
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
           super.onRestoreInstanceState(savedInstanceState);
    isOn = savedInstanceState.getBoolean("mode");

}

}