重写Gallery控件，控制滑动速度

public class MyGallery extends Gallery {

public MyGallery(Context context) {
this(context, null);
// TODO Auto-generated constructor stub
}

public MyGallery(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}

@SuppressWarnings("deprecation")
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
int kEvent;
if (isScrollingLeft(e1, e2)) {
// Check if scrolling left
kEvent = KeyEvent.KEYCODE_DPAD_LEFT;
} else {
// Otherwise scrolling right
kEvent = KeyEvent.KEYCODE_DPAD_RIGHT;
}
return onKeyDown(kEvent, null);
}

private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2) {
return e2.getX() > e1.getX();
}

}

gallery.onKeyDown(KeyEvent.KEYCODE_DPAD_LEFT, new KeyEvent(0, 0))

gallery.onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, new KeyEvent(0, 0))