Based On Selection Display Items In Second Spinner

i am trying to get states in second spinner based on selection in first spinner.if i select india getting all the states but i don't want like that,i need only india states,please

Solution 1:

You can try this

publicclassCountry {

    privateString name;
    privateString code;
    privateList<State> states;

    publicCountry(String name, String code, List<State> states) {
        this.name = name;
        this.code = code;
        this.states = states;
    }

   publicStringgetName() {
        return name;
   }

    publicStringgetCode() {
        return code;
    }

    publicList<State> getStates() {
        return states;
    }

    @OverridepublicStringtoString() {
        return name;
    }
}

publicclassState {

    privateString name;
    privateList<City> cities;

    publicState(String name, List<City> cities) {
        this.name = name;
        this.cities = cities;
    }

    publicStringgetName() {
        return name;
    }

    publicList<City> getCities() {
        return cities;
    }

    @OverridepublicStringtoString() {
        return name;
    }
}

publicclassCity {

    privateString name;
    privateString code;

    publicCity(String name, String code) {
        this.name = name;
        this.code = code;
    }

    publicStringgetName() {
        return name;
    }

    publicStringgetCode() {
        return code;
    }

    @OverridepublicStringtoString() {
        return name;
    }
}

Then build your data from JSON like this

try {
        JSONObject jsonObject = newJSONObject(loadJsonFromAsset());
        JSONArray jsonArray = jsonObject.getJSONArray("countries");

        List<Country> countries;
        List<City> cities;
        List<State> states;

        countries = newArrayList<>();
        for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject countries_object = jsonArray.getJSONObject(i);
            // get country name and codeString country_name = countries_object.getString("name");
            String country_code = countries_object.getString("countryCode");

            // get country statesJSONArray states_array = countries_object.getJSONArray("states");
            states = newArrayList<>();

            for (int j = 0; j < states_array.length(); j++) {
                JSONObject states_object = states_array.getJSONObject(j);
                // get state nameString state_name = states_object.getString("name");
                // get all city for this stateJSONArray city_array = states_object.getJSONArray("cities");
                cities = newArrayList<>();
                for (int k = 0; k < city_array.length(); k++) {
                    JSONObject city_object = city_array.getJSONObject(k);
                    // get city name and codeString city_name = city_object.getString("name");
                    String city_code = city_object.getString("code");
                    // add new city
                    cities.add(newCity(city_name, city_code));
                }
                // add new state with cities
                states.add(newState(state_name, cities));
            }
            countries.add(newCountry(country_name, country_code, states));
        }

        ArrayAdapter<Country> country_adapter = newArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, countries);
        country_adapter.setAdapter(mCountryAdapter);
        country_adapter.setOnItemSelectedListener(this);

    } catch (JSONException e) {
        e.printStackTrace();
    }

And finally

@OverridepublicvoidonItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
    Countrycountry= (Country) mCountrySpinner.getSelectedItem();
    mStateSpinner.setAdapter(newArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, country.getStates()));
}

Solution 2:

String countryCode = null;

You can call your second spinner in onItemSelected method.

countryCode = countrySpinner.getSelectedItem().toString();

// call your second adapter 

before populate state list

HashMap<String, String> hmap = newHashMap<String, String>();
hmap.put(country_code, stateName);