public void dataReset() {
// clear data
tasks.clear();
// read database
dataReadToList();
// input listview data
tasklistAdapter.notifyDataSetChanged();
}
// Context menu
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
TaskData taskSelected = (TaskData) tasklistAdapter.getItem(info.position);
String taskTitle = taskSelected.getTitle();
menu.setHeaderTitle(taskTitle);
menu.add(Menu.NONE, CONTEXT_EDIT, Menu.NONE, "Edit Task");
menu.add(Menu.NONE, CONTEXT_DELETE, Menu.NONE, "Delete Task");
}