بروز رسانی لیست ویو با کلیک روی آیتم های آن [حل شد]

مثال زیر رو امتحان کنید :

 public class ActivityMain extends Activity {

	private static int currentParentId = 0;

	private AdapterBase adapterBase;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		adapterBase = new AdapterBase(FakeData.menuData);

		final Button btnBack = (Button) findViewById(R.id.btnBack);

		btnBack.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				currentParentId = FakeData.getNewParentId(currentParentId);

				FakeData.load(currentParentId);

				adapterBase.notifyDataSetChanged();

				btnBack.setVisibility(currentParentId == 0 ? View.INVISIBLE
						: View.VISIBLE);

			}
		});

		ListView lvMenu = (ListView) findViewById(R.id.lvMenu);

		lvMenu.setAdapter(adapterBase);

		lvMenu.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				StructMenu item = FakeData.menuData.get(position);

				FakeData.load(item.id);

				currentParentId = item.id;

				adapterBase.notifyDataSetChanged();

				btnBack.setVisibility(currentParentId == 0 ? View.INVISIBLE
						: View.VISIBLE);
			}
		});
	}
}

کلاس FakeData

 public class FakeData {

	public static ArrayList<StructMenu> menuData = new ArrayList<StructMenu>();

	public static ArrayList<StructMenu> baseData = new ArrayList<StructMenu>();

	public static void init() {
		baseData.add(new StructMenu(1, 0, "Menu 1"));
		baseData.add(new StructMenu(2, 0, "Menu 2"));
		baseData.add(new StructMenu(3, 0, "Menu 3"));
		baseData.add(new StructMenu(4, 1, "Menu 4"));
		baseData.add(new StructMenu(5, 1, "Menu 5"));
		baseData.add(new StructMenu(6, 2, "Menu 6"));
		baseData.add(new StructMenu(7, 2, "Menu 7"));
		baseData.add(new StructMenu(8, 2, "Menu 8"));
		baseData.add(new StructMenu(9, 3, "Menu 9"));
		baseData.add(new StructMenu(10, 3, "Menu 10"));

		load(0);
	}

	public static void load(int parentId) {
		menuData.clear();

		for (int i = 0; i < baseData.size(); i++) {
			if (baseData.get(i).parentId == parentId) {
				menuData.add(baseData.get(i));
			}
		}
	}

	public static int getNewParentId(int currentParentId) {
		for (int i = 0; i < baseData.size(); i++) {
			if (baseData.get(i).id == currentParentId) {
				return baseData.get(i).parentId;
			}
		}
		return 0;
	}
}

کلاس AdapterBase

 public class AdapterBase extends ArrayAdapter<StructMenu> {
	public AdapterBase(ArrayList<StructMenu> array) {
		super(G.context, R.layout.adapter_menu, array);
	}

	private static class ViewHolder {

		public TextView txtName;

		public ViewHolder(View view) {
			txtName = (TextView) view.findViewById(R.id.txtName);
		}

		public void fill(ArrayAdapter<StructMenu> adapter,
				final StructMenu item, final int position) {

			txtName.setText(item.name);
		}
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {

		ViewHolder holder;

		StructMenu item = getItem(position);

		if (convertView == null) {

			convertView = G.inflater.inflate(R.layout.adapter_menu, parent,
					false);

			holder = new ViewHolder(convertView);

			convertView.setTag(holder);

		} else {

			holder = (ViewHolder) convertView.getTag();

		}

		holder.fill(this, item, position);

		return convertView;
	}
}

کلاس StructMenu

 public class StructMenu {
	public StructMenu(int _id, int _parentId, String _name) {
		id = _id;
		parentId = _parentId;
		name = _name;
	}

	public int id;
	public int parentId;
	public String name;
}