2020-01-13 WebView无法弹出键盘问题

解决方案：

    webView?.requestFocus(View.FOCUS_DOWN)
    webView?.setOnTouchListener { v, event ->
      when (event.action) {
        MotionEvent.ACTION_DOWN, MotionEvent.ACTION_UP -> if (!v.hasFocus()) {
          v.requestFocus()
        }
      }
      false
    }