groovy dependencies { implementation 'com.android.support:support-core-utils:28.0.0' } import android.support.v4.util.ArrayMap; public class MainActivity extends AppCompatActivity { private ArrayMap<String, Integer> map; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); map = new ArrayMap<>(); map.put("apple", 1); map.put("banana", 2); Integer value = map.get("apple"); if (value != null) { Log.d("MainActivity", "Value of apple: " + value); } } }