Question

我正在尝试在网页浏览中加载Google日历公共日历的网址。最初它没有问题。在某些方面，我得到的是webview中的文本“null”。我已经尝试将网址更改为仅具有相同结果的基本网页。我也试过评论wbv.loadurl行并获得相同的结果。我已经尝试单步执行代码，并在未注释掉时调用该行。任何帮助，将不胜感激。以下是填充webview的代码：

wbv = (WebView) findViewById(R.id.audioPlayer_showSchedule);
WebSettings settings = wbv.getSettings();
wbv.setWebViewClient(new TwitWebViewClient());
settings.setDomStorageEnabled(true);
settings.setDatabaseEnabled(true);
settings.setJavaScriptEnabled(true);
settings.setDefaultTextEncodingName("utf-8");
wbv.loadUrl("http://www.google.com/calendar/embed?src=r8psn8mpajnfa2703k43l6o014@group.calendar.google.com&ctz=America/Los_Angeles&program&mode=Week&gsessionid=vzeVWSq2Wdk3eVmGOUp1bQ");

Answer 1

使用以下工作代码::

public class Android_Activity extends Activity {
private Android_Activity _activity;
    @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);     
            getWindow().requestFeature(Window.FEATURE_PROGRESS);
            _activity = this;   
            setContentView(R.layout.main);

            mwebview=(WebView)view.findViewById(R.id.webview);
            mwebview.getSettings().setJavaScriptEnabled(true);
            mwebview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);

            if(checkInternetConnection(_activity)==true){
                if(savedInstanceState==null)
                    mwebview.loadUrl("http://abc.com");
                else
                    mwebview.restoreState(savedInstanceState);
            }
            else{
                AlertDialog.Builder builder = new AlertDialog.Builder(_activity);
                builder.setMessage("Please check your network connection.")
                       .setCancelable(false)
                       .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                           public void onClick(DialogInterface dialog, int id) {

                           }
                       });

                AlertDialog alert = builder.create();    
                alert.show();
            }
            mwebview.setWebChromeClient(new WebChromeClient() {

                @Override
                public void onProgressChanged(WebView view, int progress) { 
                    if(mwebview.getVisibility()==View.VISIBLE)
                    {
                        _activity.setProgress(progress * 100);
                    }
                }
            });
            mwebview.setWebViewClient(new HelloWebViewClient());
        }


        //HelloWebViewClient class for webview
        private class HelloWebViewClient extends WebViewClient {

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                // TODO Auto-generated method stub
                super.onPageStarted(view, url, favicon);
            }
            @Override
            public void onReceivedError(WebView view, int errorCode,
                    String description, String failingUrl) {
                // TODO Auto-generated method stub
                super.onReceivedError(view, errorCode, description, failingUrl);

            }
            @Override
            public void onPageFinished(WebView view, String url) {
                // TODO Auto-generated method stub
                super.onPageFinished(view, url);
            }
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                // Otherwise, the link is not for a page on my site, so launch another Activity that handles URLs
                view.loadUrl(url);
                return true;
            }

        }   //HelloWebViewClient-class
        @Override
        public boolean onKeyDown(int keyCode, KeyEvent event) {
            // Check if the key event was the Back button and if there's history
            if ((keyCode == KeyEvent.KEYCODE_BACK) && mwebview.canGoBack() ){
                mwebview.goBack();
                return true;
            }
            // If it wasn't the Back key or there's no web page history, bubble up to the default
            // system behavior (probably exit the activity)
            return super.onKeyDown(keyCode, event);
        }
        //To check whether network connection is available on device or not
            public static boolean checkInternetConnection(Activity _activity) {
                ConnectivityManager conMgr = (ConnectivityManager) _activity.getSystemService(Context.CONNECTIVITY_SERVICE);
                if (conMgr.getActiveNetworkInfo() != null
                        && conMgr.getActiveNetworkInfo().isAvailable()
                        && conMgr.getActiveNetworkInfo().isConnected()) 
                    return true;
                else
                    return false;
            }//checkInternetConnection()
}

而且在你的main.xml布局中，你必须有一个带有id webview的webview

Answer 2

这对我来说都很好看。您确定TwitWebViewClient正在做您期望的事吗？

此外，您确定要加载的网址是？我忍不住注意到它最后的"gsessionid=vzeVWSq2Wdk3eVmGOUp1bQ"。肯定会在你的会议到期后立即行动吗？

Webview将“null”显示为内容

2 个答案: