According to official documentation "Spinners provide a quick way to select one value from a set". In the default state, a spinner shows its currently selected value. Touching the spinner displays a dropdown menu with all other available values, from which the user can select a new one.
So Spinner provide a way to choose/select an option from multiple available options.
The Syntax to add a spinner in layout
<Spinner
android:id="@+id/planets_spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
Spinner Example
In this example we are giving Easy,Medium,Hard and Too Hard options to users through
Spinner and user selects an options, We show the user selected option in Toast.
The Spinner's item are populated form an ArrayAdapter,
So we need to create an ArrayAdapter and set to Spinner.Add Click Listener to Spinner
We need to add a click Listener to Spinner to handle the click event when User selects an option
main.xml
<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:background="#B2CCCC"
android:orientation="vertical">
<TextView
android:id="@+id/textView1"
android:layout_marginTop="50dp"
android:layout_marginLeft="5dp"
android:textStyle="bold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Select The Difficulty Level"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Spinner
android:id="@+id/spinner1"
android:layout_marginTop="15dp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
MainActivity.java
public class MainActivity extends Activity
{
ArrayList<String> difficultyLevelOptionsList = new ArrayList<String>();
TextView txtView1;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Spinner spinner = (Spinner) findViewById(R.id.spinner1);
difficultyLevelOptionsList.add("Easy");
difficultyLevelOptionsList.add("Medium");
difficultyLevelOptionsList.add("Hard");
difficultyLevelOptionsList.add("Too Hard");
// Create the ArrayAdapter
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(MainActivity.this
,android.R.layout.simple_spinner_item,difficultyLevelList);
// Set the Adapter
spinner.setAdapter(arrayAdapter);
// Set the ClickListener for Spinner
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> adapterView,
View view, int i, long l) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this,"You Selected : "
+ difficultyLevelOptionsList.get(i)+" Level ",Toast.LENGTH_SHORT).show();
}
// If no option selected
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
}
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