Android : Spinner Drop down example

Creating new Project

1. Create a new project and fill the required details File ⇒ New ⇒ Android Project
2. Open strings.xml file under resources folder and add following items. Add Spinner dialog tile in string resources.

strings.xml

<?xml version="1.0" encoding="utf-8"?> <resources>     <string name="app_name">AndroidSpinnerExample</string>     <string name="spinner_title">Select Category</string> </resources>

3. Now open your main.xml and design a simple layout with text label and a spinner.

main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:padding="10dip"     android:layout_width="fill_parent"     android:layout_height="wrap_content">     <!-- Text Label -->     <TextView         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:layout_marginTop="10dip"         android:text="Category:"         android:layout_marginBottom="5dp"     />     <!-- Spinner Element -->     <Spinner         android:id="@+id/spinner"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:prompt="@string/spinner_title"     /> </LinearLayout>

4. Open your main activity and extend it from OnItemSelectedListener

public class AndroidSpinnerExampleActivity extends Activity implements OnItemSelectedListener{

5. After extending your activity from OnItemSelectedListener write the following code. In the following code i am creating a simple list with list of item needed to show in spinner. And finally i am attaching those items to spinner.

AndroidSpinnerExampleActivity.java

package com.androidhive.spinner; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.Toast; import android.widget.AdapterView.OnItemSelectedListener; public class AndroidSpinnerExampleActivity extends Activity implements OnItemSelectedListener{     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         // Spinner element         Spinner spinner = (Spinner) findViewById(R.id.spinner);         // Spinner click listener         spinner.setOnItemSelectedListener(this);         // Spinner Drop down elements         List<String> categories = new ArrayList<String>();         categories.add("Automobile");         categories.add("Business Services");         categories.add("Computers");         categories.add("Education");         categories.add("Personal");         categories.add("Travel");         // Creating adapter for spinner         ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);         // Drop down layout style - list view with radio button         dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);         // attaching data adapter to spinner         spinner.setAdapter(dataAdapter);     }     @Override     public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {         // On selecting a spinner item         String item = parent.getItemAtPosition(position).toString();         // Showing selected spinner item         Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();     }     public void onNothingSelected(AdapterView<?> arg0) {         // TODO Auto-generated method stub     } }

6. Run your project.