Question

我有加载到Web视图中的动态URL。我已使用WebChromeClient处理Java脚本事件，因为我需要根据onJsAlert（）中javascript中的事件来重定向用户。该网页是第一次加载。当我返回并加载相同的URL时，即加载它。但是，当我完成操作并收到javascript事件时，我正在开始一个新活动并完成webview活动。现在，当我加载另一个URL时，它不会加载。当我终止该应用程序并导航到webview活动时，它再次加载。

以下是我对网络视图的设置

        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setBuiltInZoomControls(true);
        webView.getSettings().setDisplayZoomControls(false);
        webView.getSettings().setDomStorageEnabled(true);

        webView.getSettings().setLoadWithOverviewMode(true);
        webView.getSettings().setUseWideViewPort(true);
        webView.getSettings().setAppCacheEnabled(false);

        webView.setWebViewClient(new myWebClient());
        webView.setWebChromeClient(new MyJavaScriptChromeClient());
        webView.loadUrl(signatureURL);
        webView.setHorizontalScrollBarEnabled(false);

这是我用来显示进度对话框的WebViewClient


public class myWebClient extends WebViewClient {
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            // TODO Auto-generated method stub
            super.onPageStarted(view, url, favicon);
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if (((BaseActivity) activity).checkConnection()) {
                // TODO Auto-generated method stub
                progressBar.setVisibility(View.VISIBLE);
                view.loadUrl(url);
            }
            return true;

        }

        @Override
        public void onPageFinished(WebView view, String url) {
            // TODO Auto-generated method stub
            super.onPageFinished(view, url);
            progressBar.setVisibility(View.GONE);
        }

        @Override
        public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
            super.onReceivedError(view, request, error);
            progressBar.setVisibility(View.GONE);
        }
    }

这就是我处理JS事件的方式


private class MyJavaScriptChromeClient extends WebChromeClient {
        @Override
        public boolean onJsAlert(WebView view, String url, String message, final JsResult result) {
            //Check message for success/failure of payment
           Log.i("message",message);
           if (message.equals("Payment Fail")){
               dgAlert("Payment Failed");
           }
           else if (message.equals("Payment Success")){
               dgAlert("Payment Success");
           }
            return true;
        }
    }

这是我在点击“警报”对话框上的“确定”按钮时要做的事情

Intent intent=new Intent(Payment.this, DashBoardActivity.class);
startActivity(intent);
if (message.equals(Constants.CANCELLED)) {
   activity.finishAffinity();
   System.exit(0);
 } else
activity.finish();

Answer 1

我知道已经晚了，但是可能会帮助别人。您可以像这样在WebChromeClient中尝试返回false：

private class MyJavaScriptChromeClient extends WebChromeClient {
    @Override
    public boolean onJsAlert(WebView view, String url, String message, final JsResult result) {
        //Check message for success/failure of payment
       Log.i("message",message);
       if (message.equals("Payment Fail")){
           dgAlert("Payment Failed");
       }
       else if (message.equals("Payment Success")){
           dgAlert("Payment Success");
       }
        return false;
    }
}

它将正常工作。

Answer 2

我遇到了同样的问题，多次重新加载 url 解决了问题，在 WebViewClient 中覆盖以下方法特别是错误相关的方法并在遇到错误时重新加载 url，保持最大重新加载阈值以避免无限重新加载错误循环。还要确保在使用后正确释放/销毁 webview 以避免内存泄漏。

override fun onReceivedSslError(
                view: WebView?,
                handler: SslErrorHandler,
                error: SslError?
            ) {
                Log.e("webview", "onReceivedSslError")
                handler.proceed() // Ignore SSL certificate errors

            }
            override fun onPageStarted(view: WebView?, url: String?, favicon: Bitmap?) {
                super.onPageStarted(view, url, favicon)
                Log.e("webview", "onPageStarted")
                onPageLoadStarted = true
                progressBar.visibility = View.VISIBLE
            }

            override fun onReceivedError(
                view: WebView?,
                request: WebResourceRequest?,
                error: WebResourceError?
            ) {
                super.onReceivedError(view, request, error)
                Log.e("webview", "onReceivedError" + error.toString())
                progressBar.visibility = View.GONE
                reload()

            }
            
            override fun onReceivedHttpError(
                view: WebView?,
                request: WebResourceRequest?,
                errorResponse: WebResourceResponse?
            ) {
                super.onReceivedHttpError(view, request, errorResponse)
                Log.d("webview", "onReceivedHttpError" + errorResponse?.toString())
                progressBar.visibility = View.GONE
                reload()
            }

并为活动或片段添加重新加载功能并覆盖生命周期方法，如下所示

var reloadCount=0
const val MAX_RELOAD_TRY = 6
fun reload() {
        if ((reloadCount <= MAX_RELOAD_TRY)) {
            reloadCount++
            webView?.clearCache(true);
            webView?.clearView();
            webView?.clearHistory()
            webView?.resumeTimers()
            webView?.reload()
        }
    }

  override fun onPause() {
        super.onPause()
        webView?.onPause()
    }
    override fun onResume() {
        super.onResume()
        webView?.onResume()
    }

    override fun onBackPressed() {
        webView?.let {
            if (it.canGoBack()) {
                it.goBack()
            } else {
                super.onBackPressed()
            }
        } ?: run {
            super.onBackPressed()
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        Log.d("onDestroy", "onDestroy")
        destroyWebView()
    }

    private fun destroyWebView() {
        Log.d("destroyWebView", "destroyWebView");
        // Make sure you remove the WebView from its parent view before doing anything.
        webView?.clearHistory()
        // NOTE: clears RAM cache, if you pass true, it will also clear the disk cache.
        // Probably not a great idea to pass true if you have other WebViews still alive.
        webView?.clearCache(true)
        // Loading a blank page is optional, but will ensure that the WebView isn't doing anything when you destroy it.
        //webView?.loadUrl("about:blank")
        // NOTE: This pauses JavaScript execution for ALL WebViews,
        // do not use if you have other WebViews still alive.
        // If you create another WebView after calling this,
        // make sure to call mWebView.resumeTimers().
        webView?.pauseTimers()
        webView?.removeAllViews()
        webViewContainerRL?.removeAllViews()
        webView?.destroy()
        webViewClient = null
        webChromeClient = null
        webView = null

    }

Android Webview第二次未加载URL

2 个答案: