Single press button show Android Context Menu

public void onCreate(Bundle savedInstanceState)
{

      Button reloadBtn = (Button)findViewById(R.id.reloadBtn);
      // register button for context menu
      // just call this method, you must be long press button to show context menu
      registerForContextMenu(reloadBtn);
}

public void reloadBtnPress(View view)
{
      // register menu and call open context menu
      // you can custom to show menu
      this.openContextMenu(view);
}