In the below example code I have created a custom popup menu function. Here first I have added a Button in actvity_main.xml layout, Then in next step I have created a new popup.xml layout in menu folder, here I have added popup id and title, Now See in coding area here first I have implement OnClickListener interface and then I have used in PopupMenu class OnMenuItemClickListener method. You can see below program it clearly describe you how to create Custom Popup in android.

Step(1)activity_main.xml layout-
 

<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.andoidsrc.popupmenu.MainActivity" >

    <Button
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:background="#eecdeeef"
        android:onClick="onClick"
        android:layout_marginTop="20dp"
        android:text="Select your profile" />

</RelativeLayout>

Srep(2)Created a new popup.xml layout in menu folder-
 

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

        <item
            android:id="@+id/lang_devloper"
            android:showAsAction="ifRoom|withText"
            android:title="Devloper"
            android:visible="true"/>
        <item
            android:id="@+id/lang_tester"
            android:showAsAction="ifRoom|withText"
            android:title="Tester"
            android:visible="true"/>
        <item
            android:id="@+id/lang_coder"
            android:showAsAction="ifRoom|withText"
            android:title="Coder"
            android:visible="true"/>
        <item
            android:id="@+id/lang_designer"
            android:showAsAction="ifRoom|withText"
            android:title="Designer"
            android:visible="true"/>

    </menu>

Step(3)MainActivity-
 

public class MainActivity extends Activity implements View.OnClickListener {

    private PopupMenu popupMenu;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public void onClick(View anchor) {
        // TODO Auto-generated method stub
        popupMenu = new PopupMenu(MainActivity.this, anchor);
        popupMenu.setOnDismissListener(new OnDismissListener());
        popupMenu.setOnMenuItemClickListener(new OnMenuItemClickListener());
        popupMenu.inflate(R.menu.popup);
        popupMenu.show();
    }

    private class OnDismissListener implements PopupMenu.OnDismissListener {

        @Override
        public void onDismiss(PopupMenu menu) {
            Toast.makeText(getApplicationContext(), "Popup Menu is dismissed",
                    Toast.LENGTH_SHORT).show();
        }

    }

    private class OnMenuItemClickListener implements
            PopupMenu.OnMenuItemClickListener {

        @Override
        public boolean onMenuItemClick(MenuItem item) {
            switch (item.getItemId()) {
                case R.id.lang_devloper:
                    Toast.makeText(getApplicationContext(), "Devloper got clicked",
                            Toast.LENGTH_SHORT).show();
                    return true;
                case R.id.lang_tester:
                    Toast.makeText(getApplicationContext(), "Tester got clicked",
                            Toast.LENGTH_SHORT).show();
                    return true;
                case R.id.lang_coder:
                    Toast.makeText(getApplicationContext(), "Coder got clicked",
                            Toast.LENGTH_SHORT).show();
                    return true;
                case R.id.lang_designer:
                    Toast.makeText(getApplicationContext(), "Designer got clicked",
                            Toast.LENGTH_SHORT).show();
                    return true;

            }
            return false;
        }

    }

}