WebView根据内容高度做折叠效果

需求：webview内容超过400就显示点击展开，点击收起功能
关键代码：

rich_desc_web?.setWebViewClient(object : WebViewClient() {
        override fun shouldOverrideUrlLoading(view: WebView, url: String): Boolean {
            // 使用当前WebView处理跳转
            view.loadUrl(url)
            // true表示此事件在此处被处理，不需要再广播
            return true
        }

        override fun onReceivedError(view: WebView, request: WebResourceRequest, error: WebResourceError) {
            super.onReceivedError(view, request, error)

        }

        override fun onPageFinished(view: WebView, url: String) {
            super.onPageFinished(view, url)
            LogUtil.i("onPageFinished","onPageFinished")
            
            Handler().postDelayed(Runnable { //int contentHeight = view.getContentHeight();
                val viewHeight = view.height
                LogUtil.i("onPageFinished",viewHeight.toString()+"\t")
                richHeight = viewHeight
                if (richHeight > 400){
                    setRichHeight(400)
                    tv_rich_show_all?.visibility = View.VISIBLE
                } else {
                    setRichHeight(richHeight)
                }
                LogUtil.i("onPageFinished","onPageFinished1")
                
            }, 500)
        }
    })

onPageFinished页面加载完，加下延迟确保拿到webview真实高度。注意其他富文本控件获取可能为0，请使用webview控件。

点击展开控件代码：

tv_rich_show_all?.setOnClickListener {
        if (tv_rich_show_all?.text.toString() == "点击展开"){
            setRichHeight(richHeight)
            tv_rich_show_all?.text = "点击收起"
            tv_rich_show_all?.setCompoundDrawablesWithIntrinsicBounds(null,null,resources.getDrawable(R.mipmap.icon_celebrity_close),null)
        } else {
            setRichHeight(400)
            tv_rich_show_all?.text = "点击展开"
            tv_rich_show_all?.setCompoundDrawablesWithIntrinsicBounds(null,null,resources.getDrawable(R.mipmap.icon_celebrity_open),null)
        }
    }

private fun setRichHeight(height:Int){
    //至于是否是LinearLayout.LayoutParams看你WebView外层控件是什么
    val richParams =  LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,height)
    richParams.leftMargin = UtilHelper.dip2px(mActivity,10f)
    richParams.rightMargin = UtilHelper.dip2px(mActivity,10f)
    rich_desc_web?.layoutParams = richParams
}

关键：在onPageFinished获取WebView高度处理逻辑

题外话：如果不想看到刚进去折叠的过程，可在WebView上面加多一层加载的loading布局，等WebView折叠完，再隐藏loading布局即可。
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