Android WebView 判定网页加载的错误，androidkotlin 面试题

}}webview.loadUrl("https://www.baidu.com/")

request 输出：

{"a":{"a":"[www.baidu.com/","b":true,…](

) (Linux; Android 11; sdk_gphone_x86_arm Build/RSR1.200819.001.A1; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/83.0.4103.106 Mobile Safari/537.36","Accept":"text/ht

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ml,application/xhtml+xml,application/xml;q\u003d0.9,image/webp,image/apng,/;q\u003d0.8,application/signed-exchange;v\u003db3;q\u003d0.9","Upgrade-Insecure-Requests":"1"}}}

error 输出：

{"a":{"a":-1,"b":"net::ERR_CACHE_MISS"}}

/**

• 需要注意的是：与老版本不同，新版本已经针对所有的资源加载错误都会回调*(iframe, image, etc.), 不仅仅是加载的主页面*/public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {if (request.isForMainFrame()) {onReceivedError(view,error.getErrorCode(), error.getDescription().toString(),request.getUrl().toString());}}

所以，通过以上监听，即可知道对应的错误内容，进而做相应的业务处理。

三 常见的错误案例分析

1.错误：ERR_UNKNOWN_URL_SCHEME

复现条件:打开百度新闻资讯网页，并点击评论

来看一下页面加载 shouldOverrideUrlLoading 中回调 request 输出：

{"a":{"a":"baiduboxapp://v1/easybrowse/hybrid?upgrade\u003d1\u0026type\u003dhybrid\u0026tpl_id\u003dlanding_app.html\u0026newbrowser\u003d1\u0026style\u003d%7B%22toolbaricons%22%3A%7B%22tids%22%3A%5B%224%22%2C%221%22%2C%222%22%2C%223%22%5D%2C%22menumode%22%3A%222%22%2C%22actionBarConfig%22%3A%7B%22extCase%22%3A%220%22%7D%7D%7D\u0026slog\u003d%7B%22from%22%3A%22feed%22%7D\u0026context\u003d%7B%22nid%22%3A%22news_9777178803801641010%22%7D\u0026ch_url\u003dhttps%3A%2F%2Fmbd.baidu.com%2Fnewspage%2Fdata%2Flandingreact%3FpageType%3D2%26nid%3Dnews_9777178803801641010%26uk%3D%26sourceFrom%3DlandingShare\u0026commentInfo\u003d%7B%22topic_id%22%3A1066000039731532%2C%22opentype%22%3A2%7D\u0026logargs\u003d%7B%22source%22%3A%221020283l%22%2C%22channel%22%3A%221020283m%22%7D\u0026needlog\u003d1","b":false,"c":true,"d":false,"e":"GET","f":{"Accept":"text/html,application/xhtml+xml,application/xml;q\u003d0.9,image/avif,image/webp,image/apng,/;q\u003d0.8,application/signed-exchange;v\u003db3;q\u003d0.9","Referer":"[mbd.baidu.com/newspage/da…](

)

可以发现协议不是 http 类开头，而是百度自己定义的"baiduboxapp"。因此，不做处理，当然是识别不了的。

2.实现 UC、华为浏览器处理的效果——>无视

webview.webViewClient = object : WebViewClient() {override fun shouldOverrideUrlLoading(view: WebView?,request: WebResourceRequest?): Boolean {Log.d(TAG, "shouldOverrideUrlLoading: {request.json()}")if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {Log.d(TAG, "shouldOverrideUrlLoading: url->{request?.url}")if (view != null && request?.url?.toString() != null) {if (request.url.toString().startsWith("http")) {view.loadUrl(request.url.toString())}return true}

3.如何实现 Chrome 浏览器处理的效果——>能跳转

假定这是百度适配 Chrome 的效果，而不是 Chrome 主动去适配百度的代码页面，那么说明客户端的 WebView 也是能做到这样效果的。

基于此，我们来 urldecode 一下协议内容来看看 request 有什么特殊：

baiduboxapp://v1/easybrowse/hybrid?upgrade=1&type=hybrid&tpl_id=landing_app.html&newbrowser=1&style={"toolbaricons":{"tids":["4","1","2","3"],"menumode":"2","actionBarConfig":{"extCase":"0"}}}&slog={"from":"feed"}&context={"nid":"news_9777178803801641010"}&ch_url=[mbd.baidu.com/newspage/da…](

)

整体来看，仍旧是符合 URI 规则的。这样的话就可以考虑使用 Intent 处理的方式了。

webview.webViewClient = object : WebViewClient() {override fun shouldOverrideUrlLoading(view: WebView?,