CODEWITHSUNDEEP
c#androidxamarin
Ali
Ali

Reputation: 2768

Non-static field, method, or property

Looking at this How to show loading image or progress bar on WebView it clearly says that the following approach should work but I am having an issue as I cannot access my ProgressBar in public override void OnPageFinished(WebView view, string url)

My Code is the following 

webView.Settings.JavaScriptEnabled = true;
webView.Settings.LoadWithOverviewMode = true;
webView.Settings.UseWideViewPort = true;
webView.SetWebViewClient(new WebViewClientClass());                    
webView.LoadDataWithBaseURL("file:///android_asset/", HTML_DATA, "text/html", "UTF-8", null);

Where my WebViewClientClass is the following 

#region Webview URL handler
internal class WebViewClientClass : WebViewClient
{    
    public override bool ShouldOverrideUrlLoading(WebView view, IWebResourceRequest request)
    {
        Android.Net.Uri url = request.Url;
        view.LoadUrl(url.ToString());
        return true;
    }

    public override void OnPageStarted(WebView view, string url, Bitmap favicon)
    {
         base.OnPageStarted(view, url, favicon);
         Log.Info("101028", "loading started");
    }

    public override void OnPageFinished(WebView view, string url)
    {
        base.OnPageFinished(view, url);
        Log.Info("101028", "loading finised");
        PB.Visibility = ViewState.Gone; ***<<<<<<<------ ERROR HERE***
    }
}
#endregion

I can see the results in logcat but when I try to access my ProgressBar such as PB.Visibility = ViewState.Gone in OnPageFinished method - I get the following error

ERROR

An object reference is required for the non-static field, method, or property

PogressBar Code 

private ProgressBar PB;

protected override async void OnCreate(Bundle savedInstanceState)
{
    base.OnCreate(savedInstanceState); 
    SetContentView(Resource.Layout.Read);
    PB = FindViewById<ProgressBar>(Resource.Id.MyProgressBar);
}

Anyone knows what is the right approach for this? How do i make this work

Cheers

Upvotes: 2

Views: 143

Answers (1)

Fahadsk
Fahadsk

Reputation: 1109

From your code it seems that your ProgressBar belongs to your Activity and you are trying to access it in WebViewClientClass that's why your object reference is missing.

So you should have a method inside your activity class which will hide/show ProgressBar and there must be some kind of call back mechanism to call this method

Define an interface like below 

interface ProgressBarHandler{
    public void hideProgress();
}

And in your activity class implement this interface

class MyActivity extends Activity implements ProgressBarHandler{
    //other usual things in your activity

    protected override async void OnCreate(Bundle savedInstanceState){
        //here pass the activity instance to WebViewClientClass
        webView.SetWebViewClient(new WebViewClientClass(this)); 
    }

    public void hideProgress(){
        PB.Visibility = ViewState.Gone;
    }
}

AND finally in your WebViewClientClass 

class WebViewClientClass : WebViewClient
{    
    private ProgressBarHandler handler;
    public WebViewClientClass(ProgressBarHandler handler){
        this.handler = handler;
    }

    public override void OnPageFinished(WebView view, string url)
    {
        base.OnPageFinished(view, url);
        Log.Info("101028", "loading finised");
        handler.hideProgress();
    }
}

Upvotes: 1

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