Question

UPDATE:

So I tried the AssetManager way and ended up with this:

...
...
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
factory.setNamespaceAware(true);
XmlPullParser xrp = factory.newPullParser();

AssetManager assmgr = context.getAssets();

xrp.setInput(assmgr.open("levels/level_1.xml"), null);

//Object attributes
String type = null;
int x = 0;
int y = 0;
double angleRads = 0;

int eventType = xrp.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT) {
    if (eventType == XmlPullParser.START_DOCUMENT) {
    } else if (eventType == XmlPullParser.START_TAG) {
        if (xrp.getName().equals("Position")) {
            while (!xrp.getName().equals("X")) {  <----NULLPOINTER EXCEPTION HERE
                eventType = xrp.next();
            }           
...
...

Now this code used to work fine when xrp was a XmlResourceParser but now I get this error message:

06-01 05:13:56.797: ERROR/AndroidRuntime(946): Caused by: java.lang.NullPointerException
06-01 05:13:56.797: ERROR/AndroidRuntime(946):     at com.stickfigs.blockball.BlockBallView$BlockBallThread.initLevel(BlockBallView.java:342)

I don’t understand why this isn’t working anymore, I marked the line where the nullpointerexception is happening in the code above with an arrow.

=== vvvOLDvvv ===

In my res/xml/ folder I have a bunch of files called level_#.xml (ex: level_1.xml, level_2.xml, level_21.xml) and I have a spinner widget that I want to populate with the id names of all of the .xml files in this folder that follow the naming convention level_#.xml and only those.

I think I figured out how to set up the widget:

Spinner lsSpinner = (Spinner) findViewById(R.id.levelselect_spinner);

String levels[] = {"level_1","level_2","level_55"};

ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, levels);
spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
lsSpinner.setAdapter(spinnerArrayAdapter);

Now I just need to generate levels[] dynamically like I explained before…

How do I go about doing this?

Answer 1

Have a look at AssetManager: http://developer.android.com/reference/android/content/res/AssetManager.html#list(java.lang.String)

And then you can new a file and getName()
Link: http://developer.android.com/reference/java/io/File.html#getName()

Hope this helps.