Mirror the preview - android-camera

Question

public class AndroidCamera extends Activity implements SurfaceHolder.Callback {
Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
boolean previewing = false;;
EditText txtData;
String stringPath = "/sdcard/samplevideo.3gp";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button buttonStartCameraPreview = (Button)findViewById(R.id.startcamerapreview);
Button buttonStopCameraPreview = (Button)findViewById(R.id.stopcamerapreview);
txtData = (EditText) findViewById(R.id.editText1);
//txtData.setText("DD");
getWindow().setFormat(PixelFormat.UNKNOWN);
surfaceView = (SurfaceView)findViewById(R.id.surfaceview);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
buttonStartCameraPreview.setOnClickListener(new Button.OnClickListener(){
#TargetApi(Build.VERSION_CODES.GINGERBREAD)
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(!previewing){
camera = Camera.open(0);
if (camera != null){
txtData.setText("CamOk");
try {
//txtData.setText("DD");
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
previewing = true;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}else txtData.setText("null");
}
}});
buttonStopCameraPreview.setOnClickListener(new Button.OnClickListener(){
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(camera != null && previewing){
camera.stopPreview();
camera.release();
camera = null;
previewing = false;
}
}});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.android_camera, menu);
return true;
}
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
#Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
}
I am trying to preview the image using a front-facing camera. But the preview is mirrored. How can I mirror it again so that i can preview a non-mirrored preview. Please help, I have been searching this for days