Spinner Custom Object Example

MainActivity.java

import android.os.Bundle;
import android.support.v4.util.ArrayMap;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class MainActivity extends AppCompatActivity {

    private final static String TAG = MainActivity.class.getName();

    private final String[] keys = {
            "Object 1",
            "Object 2",
            "Object 3"
    };

    private final CustomObject[] objects = {
            new CustomObject("Object 1", 1),
            new CustomObject("Object 2", 2),
            new CustomObject("Object 3", 3)
    };

    private final ArrayMap<String, Integer> map = new ArrayMap<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Spinner spinner1 = findViewById(R.id.spinner1);
        Spinner spinner2 = findViewById(R.id.spinner2);


        for (CustomObject object : objects) {
            map.put(object.text, object.id);
        }

        ArrayAdapter<String> adapter1 = new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, keys);
        spinner1.setAdapter(adapter1);
        spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int pos, long l) {
                String key = (String) adapterView.getItemAtPosition(pos);
                int id  = map.get(key);
                Log.i(TAG, "Spinner1: id is " + id);
            }

            @Override
            public void onNothingSelected(AdapterView<?> adapterView) {

            }
        });
        ArrayAdapter<CustomObject> adapter2 = new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, objects);
        spinner2.setAdapter(adapter2);
        spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int pos, long l) {
                CustomObject object = (CustomObject) adapterView.getItemAtPosition(pos);
                Log.i(TAG, "Spinner2 : id is " + object.id);
            }

            @Override
            public void onNothingSelected(AdapterView<?> adapterView) {

            }
        });
    }
}