Code for DropDownList in Android

This blog defines code for DropDownList in Android.

Steps

• Start Eclipse IDE.
• Create a new project.
• Create a MainActivity.java file.
• Create an activity_main.xml for layout design.

MainActivity.java

package com.example.dropdownlist;

 

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemSelectedListener;

import android.widget.ArrayAdapter;

import android.widget.RelativeLayout;

import android.widget.Spinner;

import android.widget.TextView;

import android.widget.Toast;

 

public class MainActivity extends Activity {

Spinner spnr;

RelativeLayout rl;

String[] str={"Select","Yellow","red","Green","White"};

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        spnr=(Spinner)findViewById(R.id.sss);

        rl=(RelativeLayout)findViewById(R.id.rrr);

        ArrayAdapter<String> adap = new ArrayAdapter<String>(this,android.R.layout.simple_selectable_list_item,str);

spnr.setAdapter(adap);

spnr.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override

            public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,

                                    long arg3) {

                        // TODO Auto-generated method stub

                        String ss =((TextView)arg1).getText().toString();

                        Toast.makeText(getApplicationContext(),ss,40000).show();                       

            } 

            @Override

            public void onNothingSelected(AdapterView<?> arg0) {

                        // TODO Auto-generated method stub                       

            }

      });

    }     

}

Code - 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"
tools:context=".MainActivity"
android:id="@+id/rrr">
  <Spinner
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:id="@+id/sss" />
</RelativeLayout>

Output