悬浮 顶部的 scrollView

今天状态不好 感冒了 直接先看效果效果吧

布局

自定义SrollView

/**
 * Created by Administrator on 2017/6/7.
 * 

 * 悬浮 顶部的 scrollView
 */
public class SuspensionTopScrollView extends ScrollView {
    private OnScrollListener onScrollListener;
    boolean isAnimRun = false;

    public SuspensionTopScrollView(Context context) {
        this(context, null);
    }

    public SuspensionTopScrollView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public SuspensionTopScrollView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    /**
     * 设置滚动接口
     *
     * @param onScrollListener
     */
    public void setOnScrollListener(OnScrollListener onScrollListener) {
        this.onScrollListener = onScrollListener;
    }


    @Override
    public int computeVerticalScrollRange() {
        return super.computeVerticalScrollRange();
    }


    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);
        if (onScrollListener != null) {
            onScrollListener.onScroll(t);
        }
    }

    public void smoothScrollTo(final int dis) {
//        if (isAnimRun) {
//            return;
//        }

        @SuppressLint("ObjectAnimatorBinding")
        ObjectAnimator anim = ObjectAnimator.ofFloat(this, "ypx", 0.0f, 1.0f);
        anim.setDuration(100);
        anim.setInterpolator(new AccelerateDecelerateInterpolator());
        anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                isAnimRun = true;
                int mdis = (int) ((dis - getScrollY()) * (Float) animation.getAnimatedValue());
                scrollBy(0, mdis);



            }
        });
        anim.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animator) {

            }

            @Override
            public void onAnimationEnd(Animator animator) {
                isAnimRun = false;
            }

            @Override
            public void onAnimationCancel(Animator animator) {

            }

            @Override
            public void onAnimationRepeat(Animator animator) {

            }
        });
        anim.start();
    }


    /**
     * 滚动的回调接口
     *
     * @author xiaanming
     */
    public interface OnScrollListener {
        /**
         * 回调方法， 返回MyScrollView滑动的Y方向距离
         *
         * @param scrollY 、
         */
        public void onScroll(int scrollY);
    }
}

代码

 /**
     * 初始化头部悬停的 效果
     */
    private void initTopSuspension() {
        bindingView.scrollView.setOnScrollListener(this);
        bindingView.rlContent.getViewTreeObserver()
                .addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
                    @Override
                    public void onGlobalLayout() {
                        onScroll(bindingView.scrollView.getScrollY());
                    }
                });
    }

 @Override
    public void onScroll(int scrollY) {
//        setTopVisibleOrGone(scrollY);
        int top1 = bindingView.llSalaryContent.getTop() - bindingView.llTb.getHeight()
                - bindingView.tbFactory.getHeight()
                - bindingView.viewTop.getHeight();
        int top2 = bindingView.llJobContent.getTop() - bindingView.llTb.getHeight()
                - bindingView.tbFactory.getHeight()
                - bindingView.viewTop.getHeight();
        int top3 = bindingView.llEnterpriseContent.getTop() - bindingView.llTb.getHeight()
                - bindingView.tbFactory.getHeight()
                - bindingView.viewTop.getHeight();
        int top4 = bindingView.llRecommendedContent.getTop() - bindingView.llTb.getHeight()
                - bindingView.tbFactory.getHeight()
                - bindingView.viewTop.getHeight();
        if (scrollY > (top1 - 10)) {
            bindingView.llTb.setVisibility(View.VISIBLE);
        } else {
            bindingView.llTb.setVisibility(View.GONE);
        }

        if (scrollY >= top1 && scrollY < top2) {
            bindingView.llTb.setVisibility(View.VISIBLE);
            initSelectTextView(bindingView.tvSalary, bindingView.viewSalary, bindingView.ivSalary);
        } else if (scrollY >= top2 && scrollY < top3) {
            bindingView.llTb.setVisibility(View.VISIBLE);
            initSelectTextView(bindingView.tvJobs, bindingView.viewJobs, bindingView.ivJobs);
        } else if (scrollY >= top3 && scrollY < top4) {
            bindingView.llTb.setVisibility(View.VISIBLE);
            initSelectTextView(bindingView.tvEnterprise, bindingView.viewEnterprise, bindingView.ivEnterprise);
        } else if (scrollY >= top4) {
            bindingView.llTb.setVisibility(View.VISIBLE);
            initSelectTextView(bindingView.tvRecommended, bindingView.viewRecommended, bindingView.ivRecommended);
        }
    }

 private void initSelectTextView(TextView tv, View view, ImageView iv) {
        if (tv == null) {
            return;
        }
        initFixationTextView();
        tv.setTextColor(getResources().getColor(R.color.colorPrimary));
        view.setVisibility(View.VISIBLE);
        iv.setVisibility(View.VISIBLE);
    }

  private void initFixationTextView() {
        bindingView.tvSalary.setTextColor(getResources().getColor(R.color.black));
        bindingView.tvJobs.setTextColor(getResources().getColor(R.color.black));
        bindingView.tvEnterprise.setTextColor(getResources().getColor(R.color.black));
        bindingView.tvRecommended.setTextColor(getResources().getColor(R.color.black));
        bindingView.viewSalary.setVisibility(View.INVISIBLE);
        bindingView.viewJobs.setVisibility(View.INVISIBLE);
        bindingView.viewEnterprise.setVisibility(View.INVISIBLE);
        bindingView.viewRecommended.setVisibility(View.INVISIBLE);
        bindingView.ivSalary.setVisibility(View.INVISIBLE);
        bindingView.ivJobs.setVisibility(View.INVISIBLE);
        bindingView.ivEnterprise.setVisibility(View.INVISIBLE);
        bindingView.ivRecommended.setVisibility(View.INVISIBLE);
    }

直接看代码吧 不想说话