1)Write activity_main.xml:

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

   <android.support.v4.widget.SwipeRefreshLayout
       android:id="@+id/swipe"
       android:layout_height="match_parent"
       android:layout_width="match_parent"
       android:layout_below="@+id/btnClick">

       <ListView
           android:id="@+id/listView"
           android:layout_width="match_parent"
           android:layout_height="match_parent"/>


   </android.support.v4.widget.SwipeRefreshLayout>

    <Button
        android:id="@+id/btnClick"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="HIT" />

</RelativeLayout>

Here,to swipe a list we have put a Listview in

<android.support.v4.widget.SwipeRefreshLayout>

because Android provides a Support widget to swipe something that is declared inside it.

2)In respective Java file,onCreate method will be:

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

        swipe = (SwipeRefreshLayout) findViewById(R.id.swipe);
        listView = (ListView) findViewById(R.id.listView);
        btnClick = (Button) findViewById(R.id.btnClick);
        value = new ArrayList<>();


        month = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, android.R.id.text1, value);
        listView.setAdapter(month);
        btnClick.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                value.add(value.size() + "");

            }
        });

        swipe.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {

                month.notifyDataSetChanged();
                swipe.setRefreshing(false);

            }
        });
       /* swipe.setColorSchemeColors(android.R.color.holo_red_light, android.R.color.holo_green_light,
                android.R.color.holo_purple, android.R.color.holo_blue_light);*/
        swipe.setRefreshing(false);


    }

Here on a Button Click,I have count that how many times Button is pressed and when we Swipe down and refresh a list,it will show the values in a list.

So that's how we refresh a list by Swiping down:)