Popup Menu

PopUp Menu
Android Popup Menu displays the menu below the anchor text if space is available otherwise above the anchor text.

activiy_main.xml

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

<LinearLayout 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"

  android:orientation="vertical"

  tools:context="com.example.dell.popupmenu.MainActivity"> 

<Button         

 android:layout_width="wrap_content"        

 android:layout_height="wrap_content"

 android:text="Click Me"

 android:textSize="25sp"

 android:id="@+id/idPopupMenu"

 android:layout_gravity="center_horizontal"/> 

</LinearLayout> 

add menu items in menu files 
app>>res>>values>>menu  

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

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

<item android:id="@+id/item1" android:title="Item1"/> 

<item android:id="@+id/item2" android:title="Item2"/> 

<item android:id="@+id/item3" android:title="Item3"/> 

</menu> 

MainActivity.jav

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.PopupMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
   Button btnpopupmenu;
     @Override 

        protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnpopupmenu = (Button) findViewById(R.id.idPopupMenu);
        btnpopupmenu.setOnClickListener(new View.OnClickListener() {
       @Override 

         public void onClick(View view) {
         PopupMenu popupMenu = new PopupMenu(MainActivity.this,btnpopupmenu);
         popupMenu.getMenuInflater().inflate(R.menu.menu_main,popupMenu.getMenu());
         popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
           @Override 

              public boolean onMenuItemClick(MenuItem item) {
              Toast.makeText(getApplication(),"Item Clicked: "+item.getTitle(),Toast.LENGTH_SHORT).show();
              return true;
           }
        });
        popupMenu.show();
           }
        });
      }
  }