================================== NavigationbarDemo 效果预览图
![image] [image]: https://raw.github.com/zhenggang0723/NavigationbarDemo/master/preview.png "预览图"

大家可以直接下载jar文件，导入工程，然后至于如何使用请参考如下代码：

public class NativebarDemoActivity extends Activity {
	private static final String TAG = NativebarDemoActivity.class.getSimpleName();
	
	private String[] mTitle = { "关注", "热门", "分类", "最爱", "个人" };
	
	private int[] mPhoto = { R.drawable.nav_menu_home, R.drawable.nav_menu_hot,
			R.drawable.nav_menu_category, R.drawable.nav_menu_like,
			R.drawable.nav_menu_me };
	
	private int[] mPhotoSelected = { R.drawable.nav_menu_home_selected,
			R.drawable.nav_menu_hot_selected,
			R.drawable.nav_menu_category_active,
			R.drawable.nav_menu_like_active, R.drawable.nav_menu_me_selected };

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.navigationbar);
		RollNavigationBar rnb = (RollNavigationBar) findViewById(R.id.rollNavigationBar);
		/* 定制动态数据 */
		List<Map<String, Object>> list = new LinkedList<Map<String, Object>>();
		for (int i = 0; i < mTitle.length; i++) {
			Map<String, Object> map = new HashMap<String, Object>();
			map.put("title", mTitle[i]);
			map.put("photo", mPhoto[i]);
			map.put("photoSelected", mPhotoSelected[i]);
			list.add(map);
		}
		/* 设置滑动条的滑动时间，时间范围在0.1~1s，不在范围则默认0.1s */
		rnb.setSelecterMoveContinueTime(0.1f);// 可以不设置，默认0.1s
		/* 设置滑动条样式（图片） */
		rnb.setSelecterDrawableSource(R.drawable.nav_menu_bg);// 必须
		/* 设置导航栏的被选位置 */
		rnb.setSelectedChildPosition(0);// 可以不设置

		/* 导航栏扩展 */
		final MyNavigationBarAdapter adapter = new MyNavigationBarAdapter(this,
				list);
		rnb.setAdapter(adapter);// 必须
		rnb.setNavigationBarListener(new RollNavigationBar.NavigationBarListener() {
			/**
			 * position 被选位置 view 为导航栏 event 移动事件
			 */
			@Override
			public void onNavigationBarClick(int position, View view,
					MotionEvent event) {
				switch (event.getAction()) {
				case MotionEvent.ACTION_DOWN:// 按下去时
					break;
				case MotionEvent.ACTION_MOVE:// 移动中
					break;
				case MotionEvent.ACTION_UP:// 抬手时
					break;
				}

			}

		});
	}

	/**
	 * 导航栏扩展
	 */
	class MyNavigationBarAdapter extends RollNavigationBarAdapter {
		private List<Map<String, Object>> list;
		private LayoutInflater mInflater;

		public MyNavigationBarAdapter(Activity activity,
				List<Map<String, Object>> list) {
			mInflater = LayoutInflater.from(activity);
			this.list = list;
		}

		@Override
		public int getCount() {
			return list.size();
		}

		/**
		 * 获取每个组件
		 * 
		 * @param position
		 *            组件的位置
		 * @param contextView
		 *            组件
		 * @param parent
		 *            上层组件
		 */
		@Override
		public View getView(int position, View contextView, ViewGroup parent) {
			mInflater.inflate(R.layout.item, (ViewGroup) contextView);
			RollNavigationBar rollNavigationBar = (RollNavigationBar) parent;
			/* 获取组件 */
			ImageView imageView = (ImageView) contextView
					.findViewById(R.id.image_view);
			TextView titleView = (TextView) contextView
					.findViewById(R.id.title_view);

			/* 获取参数 */
			String title = "" + list.get(position).get("title");
			int photo = (Integer) list.get(position).get("photo");
			int photoSelected = (Integer) list.get(position).get(
					"photoSelected");

			/* 组件设置参数 */
			// 区分选择与被选择图片
			if (position == rollNavigationBar.getSelectedChildPosition()) {// 被选择
				imageView.setBackgroundResource(photoSelected);
			} else {// 没被选择
				imageView.setBackgroundResource(photo);
			}
			titleView.setText(title);

			return contextView;
		}

	}
}