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Im new to nifty and Im trying to change text control using nifty in JME application following this tutorial.

Below is my TextRenderer code:

Element element = nifty.getScreen("loadlevel").findElementByName("loadingtext");
TextRenderer textRenderer = element.getRenderer(TextRenderer.class);
textRenderer.setText("loadingText");

Below is my nifty GUI code code for loadLevel scene:

<screen id="loadlevel" controller = "jmebase.TestLoadingScreen">
        <layer id="loadinglayer" childLayout="center" backgroundColor="#000000">
            <panel id = "loadingpanel" childLayout="vertical" align="center" valign="center" height="32px" width="70%">
                <control name="loadingbar" align="center" valign="center" width="100%" height="100%" />
                <control id="loadingtext" name="label" align="center" 
                         text="                                                  "/>
            </panel>
        </layer>
    </screen>

I printed value of for both element and textRenderer. element is initialised properly but textRenderer object is null. I googled lot and lots of people got this issue but none provided appropriate solution. Anyone know how to fix it. Im really stuck need help.

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  • \$\begingroup\$ A Nifty Control is a composition, consisting of multiple basic elements. The loadingtext element is actually not a text element but it has a nested text inside. You should get the Label Control from loadingtext. It has a setText method. Sorry, i'm on my phone. I can elaborate later. \$\endgroup\$ Commented Apr 19, 2016 at 3:17
  • \$\begingroup\$ loadingtext element is label element and doesnt have setText method. so we get the TextRenderer wrapper for it which has setText method. But I dont know why it is null. Please post your elabotared answer. \$\endgroup\$ Commented Apr 19, 2016 at 6:24
  • \$\begingroup\$ For the case of a Label my comment was wrong. Because a Label only consists of a single text element, the control tag effectively gets replaced by this text element. \$\endgroup\$ Commented Apr 19, 2016 at 13:12

2 Answers 2

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getRenderer is going to return null if the element does not contain the class you're trying to retrieve. In this case, the element doesn't contain a TextRenderer, so it returns null.

You can avoid the error:

Element element = nifty.getScreen("loadlevel").findElementByName("loadingtext");
if(element == null)
    return;

TextRenderer textRenderer = element.getRenderer(TextRenderer.class);
if(textRenderer == null)
    return;

textRenderer.setText("loadingText");

To get your expected result of setting the text, you need to ensure the element you're locating is properly configured.

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  • \$\begingroup\$ element is properly initialised but textRenderer is still null. all code is from above tutorial. going through jme forum i found other dev also have same problem. I tried their solutions but it didnt work. Any ideas where I went wrong? \$\endgroup\$ Commented Apr 18, 2016 at 5:44
  • \$\begingroup\$ Can't say for sure. The textRenderer isn't being initialized. Attach the debugger and step through the code. See where things are going wrong. \$\endgroup\$ Commented Apr 18, 2016 at 18:42
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First off, the tutorial you linked is outdated. I also can't find any reference to Nifty in it.

I'm using Nifty 1.4 and cannot reproduce your problem. I can set the text via TextRenderer from the label.

However, you should avoid using renderers directly if you can achieve the same with a NiftyControl:

Element loadingtext = screen.findElementById("loadingtext");
Label label = loadingtext.getNiftyControl(Label.class);
label.setText("new text");

If this doesn't work for you, there might be a problem with your version of Nifty.

Also note: A text element is not the same as a label control. The Nifty manual explains this in detail: https://sourceforge.net/projects/nifty-gui/files/nifty-gui/1.3.2/nifty-gui-the-manual-1.3.2.pdf/download

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