How to display a local html file in Android?

I wanted to display a simple html page in a WebView in Android, so I made an assets folder in main and put the test.html file, but when I run the app, I get web page not available This is my code

public class AndroidHTMLActivity extends Activity { 

    WebView myBrowser;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        myBrowser = (WebView)findViewById(R.id.mybrowser);
        final MyJavaScriptInterface myJavaScriptInterface
         = new MyJavaScriptInterface(this);

        myBrowser.addJavascriptInterface(myJavaScriptInterface, "AndroidFunction");      

        myBrowser.getSettings().setJavaScriptEnabled(true); 
        myBrowser.loadUrl("file:///assets/test.html"); 
    }
}