Android Spinner is just a drop down list similar to what’s seen in other programming languages such as in HTML pages. In Android, Spinner is used to select one value from a set of values. In the default state, a spinner shows its currently selected value. Touching the spinner displays a drop down menu with all other available values, from which the user can select a new one.
Step by Step Implementation
Step 1 - Creating a New Project with Android Studio
- Open Android Studio and select "Create New Project".
- Name the project as per your wish and select your activity template.
- Click the “Finish ” button to create a new project in Android Studio.
Step 2 - Working with the activity_main.xml file
<?xml version="1.0" encoding="utf-8"?>
<!--Constraint layout which contain Spinner widget-->
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.geeksforgeeks.Spinner.MainActivity">
<!--Spinner widget-->
<Spinner
android:id="@+id/coursesspinner"
android:layout_height="50dp"
android:layout_width="160dp"
android:layout_marginEnd="10dp"
android:layout_marginStart="10dp"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</android.support.constraint.ConstraintLayout>
Step 3 - Working with the MainActivity.java file
import android.support.v7.app.AppCompatActivity;
import android.widget.AdapterView;
import android.view.View;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.os.Bundle;
// Main Activity implements Adapter view
public class MainActivity
extends AppCompatActivity
implements AdapterView.OnItemSelectedListener {
String[] courses = { "C#", "C++",
"Android", "Java",
"Ethical Hacking" };
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Spinner spino = findViewById(R.id.coursesspinner);
spin.setOnItemSelectedListener(this);
ArrayAdapter ad
= new ArrayAdapter(
this,
android.R.layout.simple_spinner_item,
courses);
ad.setDropDownViewResource(
android.R.layout
.simple_spinner_dropdown_item);
spino.setAdapter(ad);
}
@Override
public void onItemSelected(AdapterView<*> arg0,
View arg1,
int position,
long id)
{
Toast.makeText(getApplicationContext(),
courses[position],
Toast.LENGTH_LONG)
.show();
}
@Override
public void onNothingSelected(AdapterView<*> arg0)
{
}
}
