Android dropdown menu view Spinner

Define the string array in strings.xml

<resources>
    <string name="app_name">Map Direction</string>

    <string-array name="cities">
        <item>New York, NY</item>
        <item>Washington, DC</item>
        <item>Miami, FL</item>
        <item>Los Angeles, CA</item>
        <item>San Francisco, CA</item>
        <item>Las Vegas, NV</item>
    </string-array>
</resources>

Define the dropdown menu view Spinner in a layout file such as activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <Spinner
        android:id="@+id/s_cities"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"/>
</LinearLayout>

Initialize the dropdown menu in the Activity.


public class MainActivity extends AppCompatActivity {

    private Spinner spinnerCities;
    private String [] cities;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        spinnerCities = (Spinner) findViewById(R.id.s_cities);
        cities = getResources().getStringArray(R.array.cities);


        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.cities, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinnerCities.setAdapter(adapter);


        spinnerCities.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                Toast.makeText(getApplicationContext(), cities[i], Toast.LENGTH_SHORT).show();
            }

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

            }
        });
    }
}

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