Jetpack Compose - WebView 使用方法

Compose - CustomWebView.kt

@Composable
fun CustomWebView(modifier: Modifier = Modifier,
                  url:String,
                  onBack: (webView:WebView?) -> Unit,
                  onProgressChange: (progress:Int)->Unit = {},
                  initSettings: (webSettings:WebSettings?) -> Unit = {},
                  onReceivedError: (error: WebResourceError?) -> Unit = {}){
    val webViewChromeClient = object:WebChromeClient(){
        override fun onProgressChanged(view: WebView?, newProgress: Int) {
            //回调网页内容加载进度
            onProgressChange(newProgress)
            super.onProgressChanged(view, newProgress)
        }
    }
    val webViewClient = object: WebViewClient(){
        override fun onPageStarted(view: WebView?, url: String?, 
            favicon: Bitmap?) {
            super.onPageStarted(view, url, favicon)
            onProgressChange(-1)
        }
        override fun onPageFinished(view: WebView?, url: String?) {
            super.onPageFinished(view, url)
            onProgressChange(100)
        }
        override fun shouldOverrideUrlLoading(
            view: WebView?,
            request: WebResourceRequest?
        ): Boolean {
            if(null == request?.url) return false
            val showOverrideUrl = request.url.toString()
            try {
                if (!showOverrideUrl.startsWith("http://")
                    && !showOverrideUrl.startsWith("https://")) {
                    //处理非http和https开头的链接地址
                    Intent(Intent.ACTION_VIEW, Uri.parse(showOverrideUrl)).apply {
                        addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                        view?.context?.applicationContext?.startActivity(this)
                    }
                    return true
                }
            }catch (e:Exception){
                //没有安装和找到能打开(「xxxx://openlink.cc....」、「weixin://xxxxx」等)协议的应用
                return true
            }
            return super.shouldOverrideUrlLoading(view, request)
        }

        override fun onReceivedError(
            view: WebView?,
            request: WebResourceRequest?,
            error: WebResourceError?
        ) {
            super.onReceivedError(view, request, error)
            //自行处理....
            onReceivedError(error)
        }
    }
    var webView:WebView? = null
    val coroutineScope = rememberCoroutineScope()
    AndroidView(modifier = modifier,factory = { ctx ->
        WebView(ctx).apply {
            this.webViewClient = webViewClient
            this.webChromeClient = webViewChromeClient
            //回调webSettings供调用方设置webSettings的相关配置
            initSettings(this.settings)
            webView = this
            loadUrl(url)
        }
    })
    BackHandler {
        coroutineScope.launch {
            //自行控制点击了返回按键之后，关闭页面还是返回上一级网页
            onBack(webView)
        }
    }
}

调用方法.kt

    var rememberWebViewProgress: Int by remember { mutableStateOf(-1) }
    Box {
        CustomWebView(
            modifier = Modifier.fillMaxSize(),
            url = "https://www.baidu.com/",
            onProgressChange = { progress ->
                rememberWebViewProgress = progress
            },
            initSettings = { settings ->
                settings?.apply {
                    //支持js交互
                    javaScriptEnabled = true
                    //将图片调整到适合webView的大小
                    useWideViewPort = true
                    //缩放至屏幕的大小
                    loadWithOverviewMode = true
                    //缩放操作
                    setSupportZoom(true)
                    builtInZoomControls = true
                    displayZoomControls = true
                    //是否支持通过JS打开新窗口
                    javaScriptCanOpenWindowsAutomatically = true
                    //不加载缓存内容
                    cacheMode = WebSettings.LOAD_NO_CACHE
                }
            }, onBack = { webView ->
                if (webView?.canGoBack() == true) {
                    webView.goBack()
                } else {
                    finish()
                }
            }, onReceivedError = {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                    //Log.d("AAAA", ">>>>>>${it?.description}")
                }
            }
        )
        LinearProgressIndicator(
            progress = rememberWebViewProgress * 1.0F / 100F,
            modifier = Modifier
                .fillMaxWidth()
                .height(if (rememberWebViewProgress == 100) 0.dp else 5.dp),
            color = Color.Red
        )
    }

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