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效果图

特性

支持左滑和右滑显示一个菜单项,尚不支持更灵活的方式.

主要代码

class SlideLayout(context: Context?, attrs: AttributeSet? = null) :    HorizontalScrollView(context, attrs) {
       private lateinit var mLeftMenu: ViewGroup    private lateinit var mRightMenu: ViewGroup    private var mOnMenuSelected: OnMenuSelect? = null    /**     * 左侧菜单宽度     */    private var mLeftMenuWidth = 0    /**     * 右侧菜单宽度     */    private var mRightMenuWidth = 0    /**     * 滑动超过如下比例，就自动完整显示菜单。     */    private var mShowMenuRatio = 0.5    private var hasMeasured = false    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
           /**         * 显式设置中间内容区域宽度         */        if (!hasMeasured) {
               val wrapper = getChildAt(0) as LinearLayout            val content = wrapper.getChildAt(1) as ViewGroup            content.layoutParams.width = getScreenWidth()        }        super.onMeasure(widthMeasureSpec, heightMeasureSpec)    }    override fun onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int) {
           super.onLayout(changed, l, t, r, b)        if (changed) {
               val wrapper = getChildAt(0) as LinearLayout            mLeftMenu = wrapper.getChildAt(0) as ViewGroup            mRightMenu = wrapper.getChildAt(2) as ViewGroup            mLeftMenuWidth = mLeftMenu.width            mRightMenuWidth = mRightMenu.width            hasMeasured = true            //隐藏菜单，显示主体内容            scrollTo(mLeftMenu.width, 0)        }    }    /**     * 左右滑动，超过菜单本身宽度一定比例，就完整显示菜单。     */    override fun onTouchEvent(ev: MotionEvent): Boolean {
           val action = ev.action        when (action) {
               MotionEvent.ACTION_UP -> {
                   val scrollX = scrollX                if (scrollX > mLeftMenuWidth + mRightMenuWidth * mShowMenuRatio) {
                       smoothScrollTo(mLeftMenuWidth + mRightMenuWidth, 0)                    mOnMenuSelected?.onSelected(mRightMenu)                } else if (scrollX > mLeftMenuWidth * mShowMenuRatio) {
                       smoothScrollTo(mLeftMenuWidth, 0)                } else {
                       mOnMenuSelected?.onSelected(mLeftMenu)                    smoothScrollTo(0, 0)                }                return true            }        }        return super.onTouchEvent(ev)    }    private fun getScreenWidth(): Int {
           val wm = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager        val point = Point()        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
               wm.defaultDisplay.getRealSize(point)        } else {
               wm.defaultDisplay.getSize(point)        }        return point.x    }    fun setCallback(onMenuSelect: OnMenuSelect) {
           mOnMenuSelected = onMenuSelect    }}interface OnMenuSelect {
       fun onSelected(view: ViewGroup)}

完整源代码

https://gitee.com/cxyzy1/slideMenu

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