android camera picture taking problem?

Question

friends,

i am using following code to take picture from android camera

string  _path = Environment.getExternalStorageDirectory() + "/images/make_machine_example.png";
Uri selectedImage;

    protected void startCameraActivity()
            {

                File file = new File( _path );
                Uri outputFileUri = Uri.fromFile( file );

                Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );
                intent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );

                startActivityForResult( intent,0);

            }

            @Override
            protected void onActivityResult(int requestCode, int resultCode, Intent data) 
            {   


                switch( resultCode )
                {
                    case 0:
                        Log.i( "MakeMachine", "User cancelled" );
                        break;
                    case -1:
                        selectedImage = data.getData();
                        onPhotoTaken();
                        break;
                }
            }

protected void onPhotoTaken()
            {




                /*try
                {
                 Uri r= selectedImage;
                 String realpath = getRealPathFromURI(selectedImage);
                 //File file = new File(r);
                }catch(Exception ex)
                {}*/



                 BitmapFactory.Options options = new BitmapFactory.Options();
                    options.inSampleSize = 2;
                 Bitmap bitmap = BitmapFactory.decodeFile( _path, options );



            }

it does not pick picture taken from camera same code working fine on htc hero but on galaxy s bitmap is null.

in case of picking image form gallery when i use following code

private void SelectImageFromGallery()
            {

                Intent intent = new Intent(Intent.ACTION_PICK,
                         android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI);
                intent.setType("image/*");
                 startActivityForResult(intent,0);


            }

intent of activity result comes with image but in case of camera it does not and always null.

please guide what mistake am i doing?