(dynamic) Multiple spinners state/city

Question

I have to develop an android view such that i have 2 spinner controls in it, one for state and the second for cities.

My question is, how can I populate the city spi

Answer 1

Example:

    Spinner city=(Spinner)findViewById(R.id.citySpinner);
    Spinner state=(Spinner)findViewById(R.id.stateSpinner);

    final ArrayList state_options=new ArrayList();
    final ArrayList city_options=new ArrayList();

    state_options.add("state_1");
    state_options.add("state_2");
    state_options.add("state_3");
    // Here you can also get a cursor and add Strings as options to state_options instead of what i have done

    city_options.add("city_1_state_1");
    city_options.add("city_2_state_1");
    city_options.add("city_3_state_1");
    // Here you can also get a cursor and add Strings as options to city_options instead of what i have done

    ArrayAdapter cityAdapter = new ArrayAdapter(getApplicationContext(), android.R.layout.simple_spinner_item,city_options);
    city.setAdapter(cityAdapter);   

    ArrayAdapter stateAdapter = new ArrayAdapter(getApplicationContext(), android.R.layout.simple_spinner_item,state_options);
    state.setAdapter(stateAdapter);

    state.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView arg0, View view,
                        int position, long id) {

            String stateName=state_options.get(position).toString();
                resetCity(stateName);                               
        }

        @Override
        public void onNothingSelected(AdapterView arg0) {

        }
   });

Now,

public void resetCity(String stateName)
{      
      city_options.removeAll(city_options);//i haven't checked this.
      if(stateName.eqauls("state_1"))
      {
          city_option.add("city_1_state_1");
          city_options.add("city_2_state_1");
          city_options.add("city_3_state_1");
          //you can also get a cursor and add Strings as options to city_options instead of what i have done
      }
      else if(stateName.eqauls("state_2"))
      {
          city_option.add("city_1_state_2");
          city_options.add("city_2_state_2");
          city_options.add("city_3_state_2");
          // you can also get a cursor and add Strings as options to city_options instead of what i have done
      } 
      else
      {
          city_option.add("city_1_state_3");
          city_options.add("city_2_state_3");
          city_options.add("city_3_state_3");
          //you can also get a cursor and add Strings as options to city_options instead of what i have done
      }

      ArrayAdapter cityAdapter = new ArrayAdapter(getApplicationContext(), android.R.layout.simple_spinner_item,city_options);
      city.setAdapter(cityAdapter);
}

This is the simplest example.You can set your city_options and state_options from your database.and then you can use it for populating accoring spinners.