14. Using Spinner in Android

14. Using Spinner in Android

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.

For adding listener when any item selected from spinner:

Spinner spinner = (Spinner) findViewById(R.id.spinner);

spinner.setOnItemSelectedListener(this);

SpinnerActivity.java

package tutorial.android.sachin4droid.androidtutorials;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.widget.ArrayAdapter;

import android.widget.Spinner;

public class SpinnerActivity extends AppCompatActivity {

  @Override

  protected void onCreate(Bundle savedInstanceState) {

      super.onCreate(savedInstanceState);

      setContentView(R.layout.activity_spinner);

      Spinner spinner = (Spinner) findViewById(R.id.spinner);

// Create an ArrayAdapter using the string array and a default spinner layout

      ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,

              R.array.planets_array, android.R.layout.simple_spinner_item);

// Specify the layout to use when the list of choices appears

      adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

// Apply the adapter to the spinner

      spinner.setAdapter(adapter);

  }

}

Activity_spinner.xml

<?xml version="1.0" encoding="utf-8"?>

<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="tutorial.android.sachin4droid.androidtutorials.SpinnerActivity">

  <Spinner

      android:id="@+id/spinner"

      android:layout_width="368dp"

      android:layout_height="wrap_content"

      tools:layout_editor_absoluteX="8dp"

      tools:layout_editor_absoluteY="16dp" />

</android.support.constraint.ConstraintLayout>

Strings.xml

<resources>

  <string name="app_name">Android Tutorials</string>

  <!-- TODO: Remove or change this placeholder text -->

  <string name="hello_blank_fragment">Hello blank fragment</string>

  <string-array name="planets_array">

      <item>Mercury</item>

      <item>Venus</item>

      <item>Earth</item>

      <item>Mars</item>

      <item>Jupiter</item>

      <item>Saturn</item>

      <item>Uranus</item>

      <item>Neptune</item>

  </string-array>

</resources>