Description

Spinner is like a drop-down menu that provides multiple options in the list and selects anyone. I have created a spinner which is used to bind with ArrayAdapter class. ArrayAdapter class is used to store string array and display into Spinner. It provides scrolling view through which the user can get the desired value. It is a subclass of AsbSpinner. It is associated with AdapterView so, we are using an Adapter class.

Components which is introduced in the article is Spinner, TextView, onSelectedItem method. This method is called when action is performed by selecting the value from the menu.

Attributes

 android:dropDownHorizontalOffset: The amount of pixel by which the dropdown adjust itself Horizontally

 android:dropDownVerticalOffset: The amount of pixel by which the dropdown adjust itself Vertically

 android:dropDownWidth: To set the width of dropdown when SpinnerMode=”dropdown”

 android: gravity: This property is used to set the position of the controls and content

 android: prompt: The prompt appears when spinner DialogBox is display

 android:popupBackground:  When SpinnerMode=”drop-down” then the background drawable is used for drawable

 android: SpinnnerMode: It provides display mode for spinner options

 android: dropdownSelector: This attribute is used when SpinnerMode=”drop-down” is displayed

Methods

 onClick(): This method is called when the button in d is clicked

 performClick(): It is performed action when OnClickListener event is set

 onTouchEvent(): This method is applied to handle touch event on screen

 onSaveInstanceState(): It allows to generate view representation of the internal state which later can be used as a new instance

 onResolvePointerIcon(): It returns pointer icon for motion event ,if it is specified otherwise returns nothing

 getBaseline(): It returns the distance(offset) from widget text baseline from the top boundary of widget

 OnItemSelected(): it returns the selected item from spinner dropdown list

Android_Mainfest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mapsample.msclient009.dropdown">
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Main_Activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical"
    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.mapsample.msclient009.dropdown.MainActivity">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Select Item"
        android:textColor="#DDA1F1"
        android:textSize="30dp"
        android:gravity="center"
        android:background="#F1f1f1"/>
    <Spinner
        android:id="@+id/DropDown"
        android:layout_width="match_parent"
        android:layout_height="400dp"
        android:layout_weight="1"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="30dp"
        android:background="#99AA99"
        />
</LinearLayout>

Menuitem_activity.xml

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

<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:title="china">Java</item>

   <item android:title="indian">Android</item>

    <item android:title="south">C++</item>

    <item android:title="punjab">Hibernate</item>

    <item android:title="p">Spring</item>

    <item android:title="s">Struts2</item>

</menu>

Main_Activity.java

package com.mapsample.msclient009.dropdown;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
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  implements AdapterView.OnItemSelectedListener {
    String Language[] = {"Java", "Android", "C++", "Python","Hibernate","Spring","Struts2"};
    Spinner s;
     int count;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate ( savedInstanceState );
        setContentView ( R.layout.activity_main );
        s = (Spinner) findViewById ( R.id.DropDown );
        s.setOnItemSelectedListener ( this );
        ArrayAdapter arrayAdapter = new ArrayAdapter ( this, R.layout.support_simple_spinner_dropdown_item, Language );
        arrayAdapter.setDropDownViewResource ( android.R.layout.simple_spinner_dropdown_item );
        s.setAdapter (arrayAdapter);
    }
    public void onItemSelected(AdapterView<?> arg1, View sh,int p,long id)
    { if(arg1!=null) {
        count++;
        Toast.makeText ( getApplicationContext ( ), Language[p] + " List item :" + count, Toast.LENGTH_LONG ).show ( );
    }
    }
    public  void onNothingSelected(AdapterView<?> arg1)
    {Toast.makeText ( getApplicationContext (),"Nothing is selected",Toast.LENGTH_LONG ).show ();
    }
    public boolean onCreateOptionsMenu(Menu menu)
    {getMenuInflater ().inflate ( R.menu.menuitem_activity,menu );
        return  true;
    }
}

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