Android Spinner

Spinner in Android is nothing but drop down list and implementing this in android is very simple. 

In below example there is one spinner where you can select continent name and selected item will be displayed in below TextView. ArrayList "continent" is being used to store all item of spinner, but if this list is bigger you may consider to use different java file.

We need to create:

• Activity 
• MainActivity.java: contains java file and xml layout file
• MainActivity.java
• activity_main.xml

Source Codes: 

activity_main.xml

 
  RelativeLayout 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:layout_margin="15dp"
      tools:context=".MainActivity">

      <TextView
          android:id="@+id/tvSelectContinent"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_marginTop="20dp"
          android:layout_marginLeft="3dp"
          android:text="@string/select_continent" />

      <Spinner
          android:id="@+id/spinner"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_marginTop="10dp"
          android:layout_below="@+id/tvSelectContinent"
          android:background="@android:drawable/btn_dropdown"
          android:spinnerMode="dropdown" />
    
      <TextView 
          android:id="@+id/tvContinent" 
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:textSize="25sp" 
          android:layout_alignParentBottom="true"
          android:layout_marginBottom="40dp"
          android:gravity="center" />

  </RelativeLayout>

MainActivity.java

  package com.sushil.tech.simplespinner;
  import android.support.v7.app.ActionBarActivity;
  import android.os.Bundle;
  import android.view.Menu;
  import android.view.MenuItem; 
  import android.view.View;
  import android.widget.AdapterView;
  import android.widget.ArrayAdapter; 
  import android.widget.Spinner;
  import android.widget.TextView;

  public class MainActivity extends ActionBarActivity  
                            implements AdapterView.OnItemSelectedListener {

      TextView tvContinent;
      Spinner spinner;
      String[] continent = { 
          "Africa", 
          "Antarctica",
          "Asia",
          "Australia",
          "Europe", 
          "North America",
          "South America"};
   
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState); 
          setContentView(R.layout.activity_main);
          tvContinent = (TextView) findViewById(R.id.tvContinent);
          spinner = (Spinner) findViewById(R.id.spinner);
          spinner.setOnItemSelectedListener(this);

          // Create an ArrayAdapter using the string array and 
          // a default spinner layout
          ArrayAdapter<String> adapter = new ArrayAdapter<String>
                          (this, android.R.layout.simple_spinner_item, continent);

          // 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);
      }

      @Override
      public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
          String con = continent[position];
          tvContinent.setText(con); 
      }

      @Override
      public void onNothingSelected(AdapterView<?> parent) {

      }
  }

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