how to use spinner

Question

I am very new to android. I want to use 2 spinners in my application, one shows the countries list, when any country is selected the other spinner should show the list of ci

Answer 1

Here is a sample code which depicts the usage of spinner and action performed when spinner item is selected

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemSelectedListener;

public class MainActivity extends Activity {

    Spinner spin;
    String spin_val;
    String[] gender = { "Male", "Female" };//array of strings used to populate the spinner
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);//setting layout
        spin = (Spinner) findViewById(R.id.spinner_id);//fetching view's id
        //Register a callback to be invoked when an item in this AdapterView has been selected
        spin.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView arg0, View arg1,
                    int position, long id) { 
                // TODO Auto-generated method stub
                spin_val = gender[position];//saving the value selected


            }

            @Override
            public void onNothingSelected(AdapterView arg0) {
                // TODO Auto-generated method stub

            }

        });
      //setting array adaptors to spinners 
      //ArrayAdapter is a BaseAdapter that is backed by an array of arbitrary objects
        ArrayAdapter spin_adapter = new ArrayAdapter(MainActivity.this, android.R.layout.simple_spinner_item, gender);

        // setting adapteers to spinners
        spin.setAdapter(spin_adapter);
    }


}

To add a list of values to the spinner, you then need to specify a SpinnerAdapter in your Activity, which extends Adapter class.. A spinner adapter allows to define two different views: one that shows the data in the spinner itself and one that shows the data in the drop down list when the spinner is pressed.You can also download & refer to the complete spinner_demo example project for better understanding.