TypeArray in Android - How to store custom objects in xml and retrieve them?

Question

I have a class like

public class CountryVO {
    private String countryCode;
    private String countryName;
    private Drawable countryFlag;

    public St         


        

Answer 1

When I need custom objects that can be edited outside code i generally use json which is easier to read for both humans and (possibly) machines ;)

You can also have more complex objects than with simple arrays.

Once you create a json file (e.g. countries.json) in the /res/raw folder like this:

{ "countries" : [
    {"country" : "Albania", "countryCode" : "al" },
    {"country" : "Algeria", "countryCode" : "dz"},
    {"country" : "American Samoa", "countryCode" : "as"},
    {"country" : "India", "countryCode" : "in"},
    {"country" : "South Africa", "countryCode" : "sa"}
]}

you can load the data like this:

InputStream jsonStream = context.getResources().openRawResource(R.raw.countries);
JSONObject jsonObject = new JSONObject(Strings.convertStreamToString(jsonStream));
JSONArray jsonContries = jsonObject.getJSONArray("countries");
List countries = new ArrayList();
for (int i = 0, m = countries.length(); i < m; i++) {
    JSONObject jsonCountry = countries.getJSONObject(i);
    CountryVO country = new CountryVO();
    country.setCountryName(jsonCountry.getString("country"));
    String co = jsonCountry.getString("countryCode");
    country.setCountryCode(co);
    try {
        Class drawableClass = com.example.R.drawable.class; // replace package
        Field drawableField = drawableClass.getField(co);
        int drawableId = (Integer)drawableField.get(null);
        Drawable drawable = getResources().getDrawable(drawableId);
        country.setCountryFlag(drawable);
     } catch (Exception e) {
         // report exception
     }
     countries.add(country);
}

If you don't want to do the parsing manually you can also use gson which helps you to pass the objects and then load the drawables in a lazy fashion... ;)

Edit: Added utility class

public String convertStreamToString(InputStream is) { 
  Scanner s = new Scanner(is).useDelimiter("\\A");
  return s.hasNext() ? s.next() : "";
}

Hope it helps