scroll down to refresh android code example

Example: SwipeRefreshLayout

public class ActivityMain extends FragmentActivity implements OnRefreshListener {

    private SwipeRefreshLayout mSwipeRefreshLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        setContentView(R.layout.activity_main);
        mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.container);
        mSwipeRefreshLayout.setOnRefreshListener(this);

        super.onCreate(savedInstanceState);
    }

    @Override
    public void onRefresh() {
        Toast.makeText(this, "Refresh", Toast.LENGTH_SHORT).show();
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                mSwipeRefreshLayout.setRefreshing(false);
            }
        }, 2000);
    }
}