How can I know that my WebView is loaded 100%?

Question

I'm trying to load in my WebView some HTML code that contains JavaScript.

Now , I want to test if my WebView is loaded before 5 secondes. I've tried the method getProgress(), but sometimes I get that the progress is 100, but my Webview is not loaded.
Is there another way to be sure that my Webview is loaded 100%?

This is a part of my code :

sdk.getWebView().loadDataWithBaseURL("notreal/", data_html,MIME_TYPE,ENCODING_UTF_8,null);

Timer timer = new Timer();
TimerTask task = new TimerTask() {

    @Override
    public void run(){                      
    Log.i("TAG", "progress fin = "+sdk.getWebView().getProgress());

    if(sdk.getWebView().getProgress() <100){
        //cancel the webView
        sdk.getContext().runOnUiThread(new Runnable() {
             @Override
             public void run() {
            sdk.getImgView().setVisibility(View.VISIBLE);
            sdk.getWebView().setVisibility(View.GONE);
             }
        });
    }

    // else ,the Webview is loaded
    else{
        //prepare webview 
        sdk.getContext().runOnUiThread(new Runnable() {
            @Override
            public void run(){
                     // hide imageView
                     sdk.getImgView().setVisibility(View.GONE);
                     sdk.getWebView().setVisibility(View.VISIBLE);
            }
        });
    }

 }
 };
 timer.schedule(task, 5000);

Answer 1

As said here: How to listen for a WebView finishing loading a URL?~

boolean loadingFinished = true;
boolean redirect = false;

mWebView.setWebViewClient(new WebViewClient() {

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String urlNewString) {
        if (!loadingFinished) {
           redirect = true;
        }

        loadingFinished = false;
        view.loadUrl(urlNewString);
        return true;
    }

    @Override
    public void onPageStarted(WebView view, String url, Bitmap facIcon) {
        loadingFinished = false;
        //SHOW LOADING IF IT ISNT ALREADY VISIBLE  
    }

    @Override
    public void onPageFinished(WebView view, String url) {
        if (!redirect) {
            loadingFinished = true;
        }

        if (loadingFinished && !redirect) {
            //HIDE LOADING IT HAS FINISHED
        } else {
            redirect = false; 
        }

    }
});