CODEWITHSUNDEEP
androidwebviewandroid-webviewservice-workeroffline
user2335065
user2335065

Reputation: 2557

Android webview not showing offline page saved by service worker

I have a webpage with service worker, that in offline mode, mobile Chrome can still show my offline.html.

Now I have an Android APP with a webview to show the page, but when there is no internet, there is a Android error page saying "Webpage not available The webpage at xxxxxx could not be loaded because: net:ERR_FAILED"

How can I solve it? Can I prevent checking of internet connection in the Andoird APP? Thank you very much!

Upvotes: 1

Views: 1619

Answers (1)

Bach Vu
Bach Vu

Reputation: 2348

You need to override your own WebViewClient and check the Internet connection in in shouldOverrideUrlLoading

public boolean checkInternetConnection(Context context) {   

    ConnectivityManager con_manager = (ConnectivityManager) 
      context.getSystemService(Context.CONNECTIVITY_SERVICE);

    return (con_manager.getActiveNetworkInfo() != null
        && con_manager.getActiveNetworkInfo().isAvailable()
        && con_manager.getActiveNetworkInfo().isConnected());
}

class CustomWebViewClient extends WebViewClient {
  @Override
  public boolean shouldOverrideUrlLoading(WebView view, String url) {
    if (!checkInternetConnection(this)) {
      view.loadUrl("file:///android_asset/filename.html");
    } else {
      view.loadUrl(url);
    }     
    return true;
  }
}

And ofcourse, set your custom WebViewClient to your WebView

webview.setWebViewClient(new CustomWebViewClient())

Also, put filename.html in your Android project assets folder

Upvotes: 1

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