ConstraintLayout 动态设计View的约束

对于 ConstraintLayout 约束布局我想大家应该都接触过，约束布局可以减少布局的嵌套并且约束写的好没有适配的烦恼。

如果不了解的同学 点击这里了解约束布局ConstraintLayout

我这边这篇博客是解决大家在项目中对于View的显示（View.VISIBLE）和 隐藏 （View.GONE）的动态烦恼。

 如果你当前的约束A  被隐藏那么 和A有约束的View会在布局错乱 ，所以才需要动态的添加约束，

 直接工具类当前和XML中的约束名字都是一致的并且上备注。

public class ConstraintUtil
{
    private ConstraintLayout constraintLayout;
    private ConstraintBegin begin;
    private ConstraintSet applyConstraintSet = new ConstraintSet();
    private ConstraintSet resetConstraintSet = new ConstraintSet();

    public ConstraintUtil(ConstraintLayout constraintLayout)
    {
        this.constraintLayout = constraintLayout;
        resetConstraintSet.clone(constraintLayout);
    }

    /**
     * 开始修改
     * @return
     */
    public ConstraintBegin begin()
    {
        synchronized (ConstraintBegin.class)
        {
            if (begin == null)
            {
                begin = new ConstraintBegin();
            }
        }
        applyConstraintSet.clone(constraintLayout);
        return begin;
    }

    /**
     * 带动画的修改
     * @return
     */
    public ConstraintBegin beginWithAnim()
    {
        TransitionManager.beginDelayedTransition(constraintLayout);
        return begin();
    }

    /**
     * 重置
     */
    public void reSet()
    {
        resetConstraintSet.applyTo(constraintLayout);
    }

    /**
     * 带动画的重置
     */
    public void reSetWidthAnim()
    {
        TransitionManager.beginDelayedTransition(constraintLayout);
        resetConstraintSet.applyTo(constraintLayout);
    }

    public class ConstraintBegin
    {
        /**
         * 清除关系

         * 注意：这里不仅仅会清除关系，还会清除对应控件的宽高为 w:0,h:0 //还会隐藏掉该控件
         * @param viewIds
         * @return
         */
        public ConstraintBegin clear(@IdRes int... viewIds)
        {
            for (int viewId : viewIds)
            {
                applyConstraintSet.clear(viewId);
            }
            return this;
        }

        /**
         * 清除某个控件的，某个关系
         * @param viewId
         * @param anchor
         * @return
         */
        public ConstraintBegin clear(int viewId,int anchor)
        {
            applyConstraintSet.clear(viewId,anchor);
            return this;
        }
        /**
         * 为某个控件设置 margin
         * @param viewId 某个控件ID
         * @param left marginLeft
         * @param top   marginTop
         * @param right marginRight
         * @param bottom marginBottom
         * @return
         */
        public ConstraintBegin setMargin(@IdRes int viewId, int left, int top, int right, int bottom)
        {
            setMarginLeft(viewId,left);
            setMarginTop(viewId,top);
            setMarginRight(viewId,right);
            setMarginBottom(viewId,bottom);
            return this;
        }

        /**
         * 为某个控件设置 marginLeft
         * @param viewId 某个控件ID
         * @param left marginLeft
         * @return
         */
        public ConstraintBegin setMarginLeft(@IdRes int viewId, int left)
        {
            applyConstraintSet.setMargin(viewId, ConstraintSet.LEFT, left);
            return this;
        }

        /**
         * 为某个控件设置 marginRight
         * @param viewId 某个控件ID
         * @param right marginRight
         * @return
         */
        public ConstraintBegin setMarginRight(@IdRes int viewId, int right)
        {
            applyConstraintSet.setMargin(viewId, ConstraintSet.RIGHT, right);
            return this;
        }

        /**
         * 为某个控件设置 marginTop
         * @param viewId 某个控件ID
         * @param top marginTop
         * @return
         */
        public ConstraintBegin setMarginTop(@IdRes int viewId, int top)
        {
            applyConstraintSet.setMargin(viewId, ConstraintSet.TOP, top);
            return this;
        }

        /**
         * 为某个控件设置marginBottom
         * @param viewId 某个控件ID
         * @param bottom marginBottom
         * @return
         */
        public ConstraintBegin setMarginBottom(@IdRes int viewId, int bottom)
        {
            applyConstraintSet.setMargin(viewId, ConstraintSet.BOTTOM, bottom);
            return this;
        }

        /**
         * 为某个控件设置关联关系 left_to_left_of
         * @param startId
         * @param endId
         * @return
         */
        public ConstraintBegin Left_toLeftOf(@IdRes int startId, @IdRes int endId)
        {
            applyConstraintSet.connect(startId, ConstraintSet.LEFT, endId, ConstraintSet.LEFT);
            return this;
        }

        /**
         * 为某个控件设置关联关系 left_to_right_of
         * @param startId
         * @param endId
         * @return
         */
        public ConstraintBegin Left_toRightOf(@IdRes int startId, @IdRes int endId)
        {
            applyConstraintSet.connect(startId, ConstraintSet.LEFT, endId, ConstraintSet.RIGHT);
            return this;
        }

        /**
         * 为某个控件设置关联关系 top_to_top_of
         * @param startId
         * @param endId
         * @return
         */
        public ConstraintBegin Top_toTopOf(@IdRes int startId, @IdRes int endId)
        {
            applyConstraintSet.connect(startId, ConstraintSet.TOP, endId, ConstraintSet.TOP);
            return this;
        }

        /**
         * 为某个控件设置关联关系 top_to_bottom_of
         * @param startId
         * @param endId
         * @return
         */
        public ConstraintBegin Top_toBottomOf(@IdRes int startId, @IdRes int endId)
        {
            applyConstraintSet.connect(startId, ConstraintSet.TOP, endId, ConstraintSet.BOTTOM);
            return this;
        }
        /**
         * 为某个控件设置关联关系 right_to_left_of
         * @param startId
         * @param endId
         * @return
         */
        public ConstraintBegin Right_toLeftOf(@IdRes int startId, @IdRes int endId)
        {
            applyConstraintSet.connect(startId, ConstraintSet.RIGHT, endId, ConstraintSet.LEFT);
            return this;
        }
        /**
         * 为某个控件设置关联关系 right_to_right_of
         * @param startId
         * @param endId
         * @return
         */
        public ConstraintBegin Right_toRightOf(@IdRes int startId, @IdRes int endId)
        {
            applyConstraintSet.connect(startId, ConstraintSet.RIGHT, endId, ConstraintSet.RIGHT);
            return this;
        }
        /**
         * 为某个控件设置关联关系 bottom_to_bottom_of
         * @param startId
         * @param endId
         * @return
         */
        public ConstraintBegin Bottom_toBottomOf(@IdRes int startId, @IdRes int endId)
        {
            applyConstraintSet.connect(startId, ConstraintSet.BOTTOM, endId, ConstraintSet.BOTTOM);
            return this;
        }

        /**
         * 为某个控件设置关联关系 bottom_to_top_of
         * @param startId
         * @param endId
         * @return
         */
        public ConstraintBegin Bottom_toTopOf(@IdRes int startId, @IdRes int endId)
        {
            applyConstraintSet.connect(startId, ConstraintSet.BOTTOM, endId, ConstraintSet.TOP);
            return this;
        }

        /**
         * 为某个控件设置宽度
         * @param viewId
         * @param width
         * @return
         */
        public ConstraintBegin setWidth(@IdRes int viewId, int width)
        {
            applyConstraintSet.constrainWidth(viewId, width);
            return this;
        }

        /**
         * 某个控件设置高度
         * @param viewId
         * @param height
         * @return
         */
        public ConstraintBegin setHeight(@IdRes int viewId, int height)
        {
            applyConstraintSet.constrainHeight(viewId, height);
            return this;
        }

        /**
         * 提交应用生效
         */
        public void commit()
        {
            applyConstraintSet.applyTo(constraintLayout);
        }
    }
}

 使用方式很简单 如下

new ConstraintUtil(你的约束布局引用);

有了 ConstraintUtil 的对象就可以进行使用了当然 最后不要忘了   commit();方法