Now let’s see about Dropdown (Known as Spinner) in android.
In this project, we are going to show a list of android versions in a Spinner.
for that create a new project named Simple Dropdown(you can change the name as your wish :p ).
Now enter the following data in your activity_main.xml file.
<?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="com.a4akhilsudha.simpledropdown.MainActivity"> <Spinner android:id="@+id/spinner" android:layout_width="0dp" android:layout_height="50dp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintHorizontal_bias="0.0" app:layout_constraintVertical_bias="0.112" /> </android.support.constraint.ConstraintLayout>
Now create a string array in your string.xml file. In here we are creating a list of android versions.
<resources> <string name="app_name">Simple Dropdown</string> <string-array name="android_versions"> <item>Apple pie</item> <item>Banana bread</item> <item>Cupcake</item> <item>Donut</item> <item>Eclair</item> <item>Froyo</item> <item>Gingerbread</item> <item>Honeycomb</item> <item>Ice cream sandwich</item> <item>Jellybean</item> <item>Kitkat</item> <item>Lollipop</item> <item>Marshmallow</item> <item>Nougat</item> <item>Oreo</item> </string-array> </resources>
Now open your MainActivity.java file and enter the following data.
package com.a4akhilsudha.simpledropdown; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.Toast; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); /*Find the id of spinner*/ final Spinner spinner = (Spinner) findViewById(R.id.spinner); /*set an adapter with strings array*/ spinner.setAdapter(new ArrayAdapter<>(this,R.layout.support_simple_spinner_dropdown_item,getResources().getStringArray(R.array.android_versions))); /*set click listener*/ spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(MainActivity.this, "You have Selected "+ spinner.getSelectedItem().toString(), Toast.LENGTH_SHORT).show(); } @Override public void onNothingSelected(AdapterView<?> parent) { /*Do something if nothing selected*/ } }); } }
Now run (Shift + f10) the program on a real device or in a virtual device.
Congrats …. You just created an android app which displays a drop down menu having some android versions.
Output :
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