如何保存和还原Webview状态？

Question

当我使用备份和还原Webview状态时，我收到此消息：x地址处的网页可能暂时关闭或可能已永久移至新的网址。

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    super.onSaveInstanceState(savedInstanceState);
    webViewShowPoll.saveState(savedInstanceState);                                    
}

@Override
public void onRestoreInstanceState(Bundle outState) {
  super.onRestoreInstanceState(outState);
    webViewShowPoll.restoreState(outState);
}

和Androidmanifest.xml

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.SET_DEBUG_APP"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />    


    <activity
        android:name="com.omid.epoll.mobile.Poll"
        android:launchMode="singleInstance"
        android:label="@string/title_activity_poll" 
        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen">
    </activity>

Answer 1

 if (isInternetPresent) {
        // Internet Connection is Present
        // make HTTP requests
        // showAlertDialog(HomeScreen.this, "Internet Connection",
        // "You have internet connection", true);

        webviewbrowse.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
        webviewAds.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
        webviewbrowse.loadUrl("http://www.example.com");
    } else {
        // Internet connection is not present
        // Ask user to connect to Internet
        webviewbrowse.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
        webviewAds.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
        webviewbrowse.loadUrl("http://example.com");
        showAlertDialog(HomeScreen.this, "internet doesn't connect",
                " please connect to internet", false);
    }