WebView第二次显示空白屏幕？ [英] WebView shows blank screen the second time?

问题描述

我目前正在开发一款加载 https://web.whatsapp.com/ whatsapp的应用适用于Android WebView中的桌面模式的Web。
它在棒棒糖版本上工作正常，但在API 23及以上版本（棉花糖及以上版本）上面，应用程序仅加载网站一次，如果按下重新加载按钮，它只显示一个空白屏幕！

I am currently working on an app that loads https://web.whatsapp.com/ whatsapp for web in desktop mode in Android WebView. It is working fine on lollipop version but above those i.e. API 23 and above (marshmallow and above) the app loads the website only once and if the reload button is pressed it just shows a blank screen !

这里的代码在android API级别21上工作正常但不在上面请帮助!!

public class Main_web_view_frag extends android.support.v4.app.Fragment
{

 public WebView Assignment_webView;

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        View slide_view = inflater.inflate(R.layout.assignment_main_webview, container, false);

        Assignment_webView = (WebView)slide_view.findViewById(R.id.webView);

        Assignment_webView.getSettings().setJavaScriptEnabled(true);
        Assignment_webView.setWebViewClient(new My_web_Browser());
        Assignment_webView.loadUrl("https://web.whatsapp.com/");
        setDesktopMode(true);

        return slide_view;
    }


    private class My_web_Browser extends WebViewClient
    {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url)
        {
             return true;
        }
    }

    public void setDesktopMode(final boolean enabled)
    {
        final WebSettings Assignment_webSettings = Assignment_webView.getSettings();

         String new_Assign_UserAgent;

        if (enabled)
        {
            new_Assign_UserAgent = Assignment_webSettings.getUserAgentString().replace("Mobile", "eliboM").replace("Android", "diordnA");
        }
        else
        {
            new_Assign_UserAgent = Assignment_webSettings.getUserAgentString().replace("eliboM", "Mobile").replace("diordnA", "Android");
        }


        Assignment_webSettings.getJavaScriptEnabled();
        Assignment_webSettings.setUserAgentString(new_Assign_UserAgent);

        Assignment_webSettings.setUseWideViewPort(true);
        Assignment_webSettings.setLoadWithOverviewMode(true);
        Assignment_webSettings.setSupportZoom(enabled);
        Assignment_webSettings.setBuiltInZoomControls(true);
        Assignment_webSettings.getJavaScriptCanOpenWindowsAutomatically();
        Assignment_webSettings.setDisplayZoomControls(false);

        Assignment_webSettings.setDatabaseEnabled(true);
        Assignment_webSettings.setDomStorageEnabled(true);
        Assignment_webSettings.setAllowFileAccess(true);
        Assignment_webSettings.setAppCacheEnabled(true);

        Assignment_webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
        Assignment_webSettings.setAppCachePath(getActivity().getApplicationContext().getCacheDir().getPath());


        String appCachePath = getActivity().getCacheDir().getAbsolutePath();
        Assignment_webSettings.setAppCachePath(appCachePath);
    }


}

推荐答案

终于有了解决方案!!您只需要在webview中添加一个useragent字符串，就像chrome或任何其他Web浏览器一样。

Finally got a solution !! You just need to add a useragent string to your webview to act like chrome or any other web browser.

yourWebView.getSettings().setUserAgentString("Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36");

这篇关于WebView第二次显示空白屏幕？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！