Android drop-down list box how to use Spinner

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The file directory is as follows:

Lay out a drop-down list box Spinner in activity_main.xml

Next, create the spinner_item.xml file under the layout folder, placing the controls in the drop-down list box, where only the text is displayed, so the code is as follows:

Then the call is made in MainActivity.java to set the data

Package com.example.administrator.myapplication; import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.Spinner;import android.widget.Toast; public class MainActivity extends AppCompatActivity {@ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.activity_main) / / get control Spinner spinner = (Spinner) findViewById (R.id.spinner); / / data to be added to the drop-down list box String [] array = new String [] {"Tang Monk", "Sun WuKong", "Zhu Bajie", "Sha Wujing", "Little White Dragon"} / / create adapter final ArrayAdapter dataAdapter = new ArrayAdapter (MainActivity.this, R.layout.spinner_item, array); dataAdapter.setDropDownViewResource (R.layout.spinner_item); / / set adapter spinner.setAdapter (dataAdapter) for drop-down list box / / listening event spinner.setOnItemSelectedListener (new AdapterView.OnItemSelectedListener () {@ Override public void onItemSelected (AdapterView parent, View view, int position, long id) {String value = dataAdapter.getItem (position). ToString () / / get the value Toast.makeText of the selected drop-down list box item (MainActivity.this, "you selected:" + value, Toast.LENGTH_SHORT). Show ();} @ Override public void onNothingSelected (AdapterView parent) {/ / No selected processing events}});}}

The spinner completed for initializing the data is as follows:

The spinner of a selected item is as follows:

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