下拉实现放大头部布局,先看一下下图的效果:
代码实现如下:
public class HeadZoomScrollView extends ScrollView {
private View mZoomView;
private int mZoomViewWidth;
private int mZoomViewHeight;
private float firstPosition;//记录第一次按下的位置
private boolean isScrolling;//是否正在缩放
private float mScrollRate = 0.3f;//缩放系数,缩放系数越大,变化的越大
private float mReplyRate = 0.5f;//回调系数,越大,回调越慢
public HeadZoomScrollView(Context context) {