AndroidGUI29：获取ImageView中的图像需要注意的问题(3)

        public class Compare2Images extends Activity

        implements

        OnTouchListener

        {

                private Bitmap obmp;

                private ImageView iv_photo;

                private Button btn_photo;

                @Override

                public void onCreate(BundlesavedInstanceState)

                {

                        super.onCreate(savedInstanceState);

                        setContentView(R.layout.main);

                        iv_photo =(ImageView)findViewById(R.id.iv_photo);

                        iv_photo.setOnTouchListener(this);

                        btn_photo = (Button)findViewById(R.id.btn_photo);

                        btn_photo.setOnTouchListener(this);

               }

                public boolean onTouch(View v, MotionEventevent)

                {

                        switch(v.getId())

                        {

                        case R.id.iv_photo: