WebView

webView

setWebViewClient （new WebViewClient()）

mWebView.setWebViewClient(new WebViewClient(){
			@Override
            public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
                super.onReceivedError(view, request, error);
                log("onReceivedError request :"+request.getUrl().toString()+", "+error.getErrorCode()+", "+error.getDescription());
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                }
            }
})

主要是用来处理webView界面加载url的生命周期。每个生命周期需要完成的事情，具体可以见下面的文章。
https://blog.csdn.net/harvic880925/article/details/51523983

setWebChromeClient

setWebChromeClient 与 setWebClient 之间存在区别，区别如下：
https://www.jianshu.com/p/74ccbba4bc50