android 键盘弹出，布局重绘

在我们一般写登录、注册页面的时候，经常会因为软键盘弹出导致页面上移，导致布局被遮挡，用户体验很不好。
我们可以使用自定义Layout，动态判断layout是否改变，在根据权重进行适配。

class AdjustLayout(context: Context, attributes: AttributeSet) : LinearLayout(context, attributes) {    var keyboardShowed = false    override fun onLayout(changed: Boolean, left: Int, top: Int, right: Int, bottom: Int) {        super.onLayout(changed, left, top, right, bottom)        if (changed) {            val width = right - left            val height = bottom - top            if (height.toFloat() / width.toFloat() < 4f / 3f) { // 如果高宽比小于4:3说明此时键盘弹出                post {                      loginBgLayout.visibility = View.INVISIBLE                      val params = loginLayout.layoutParams as LayoutParams                      params.weight = 1.5f                      keyboardShowed = true                      loginLayoutTop.requestLayout()                }            } else {                if (keyboardShowed) {                    post {                          loginBgWallLayout.visibility = View.VISIBLE                          val params = loginLayout.layoutParams as LayoutParams                          params.weight = 6f                          loginLayout.requestLayout()                    }                }            }        }    }}

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