android中每個頁面基本上都有頂部導航，android中頂部導航有actionbar，但actionbar一方面要向下相容問題，另一方面很多時候修改樣式比較繁瑣，自定義的actionbar也需要寫很多東西。對於頂部導航，有兩個比較可行的方式：

1. 可以自己封裝一套actionbar，匯入v7包，然後在style中配置相應的屬性。
2. 自己封裝一個pop做為導航效果。

下面是用pop封裝的一個導航

效果圖：

在需要的時候要需要neｗ一下選單，呼叫點選事件：

public class MainActivity extends Activity implements OnClickListener
 
 {
    private TextView tv_title;
    private ImageView iv_back;
    private ImageView iv_list;
    PopListMenu listMenu;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);

        tv_title = (TextView) findViewById(R.id.tv_title);
        iv_back = (ImageView) findViewById(R.id.iv_back);
        iv_list = (ImageView) findViewById(R.id.iv_list);
        iv_back.setOnClickListener(this
 
);
        iv_list.setOnClickListener(this);
        // 在這可設定返回，選單圖片樣式和標題；
        tv_title.setText("標題");
        // 2指的是組數，在這設定了兩組；如果不需要的話寫成1組
        listMenu = new PopListMenu(this, 1);
        listMenu.addItems(new String[] { "選單1", "選單2", "選單3", "選單4" });
        //也可設定listMenu的寬度；
        // listMenu.setWidth(200);
 

        listMenu.setOnItemClickListener(new Sys.OnItemClickListener() {

            @Override
            public void run(AdapterView<?> arg0, View arg1, int index, long arg3)
                    throws Exception {
                // switch case 來判斷下標；
                Toast.makeText(MainActivity.this, "點選" + index, 0).show();
            }
        });
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.iv_back:
            Toast.makeText(this, "返回", 0).show();
            break;
        case R.id.iv_list:
            listMenu.showAsDropDown(v);
            break;
        }
    }
}

下面是對pop的封裝

public class PopListMenu {
    private ArrayList<String> itemList;
    private Context context;
    private PopupWindow popupWindow;
    private ListView listView;

    /**
     * 選中項索引列表
     */
    ArrayList<Integer> indexList = new ArrayList<Integer>();
    /**
     * 每組選項在itemList的起始位置
     */
    ArrayList<Integer> itemStartList = new ArrayList<Integer>();

    // private OnItemClickListener listener;

    public PopListMenu(Context context) {
        this(context, 1);
    }

    public boolean showDot = true;

    /**
     * @param context
     * @param count
     *            有幾組選項
     */
    public PopListMenu(Context context, int count) {
        // TODO Auto-generated constructor stub
        for (int i = 0; i < count; i++) {
            indexList.add(0);
            itemStartList.add(0);
        }
        this.context = context;

        itemList = new ArrayList<String>(2);

        View view = LayoutInflater.from(context)
                .inflate(R.layout.popmenu, null);

        // 設定 listview
        listView = (ListView) view.findViewById(R.id.listView);
        listView.setAdapter(new PopAdapter());
        listView.setFocusableInTouchMode(true);
        listView.setFocusable(true);

        popupWindow = new PopupWindow(view, LayoutParams.WRAP_CONTENT,
                LayoutParams.WRAP_CONTENT);

        // 點選返回，popupWindow消失；
        popupWindow.setBackgroundDrawable(new BitmapDrawable());
    }

    public void setWidth(int width) {
        LayoutParams para = listView.getLayoutParams();
        para.width = Sys.dp2px(width);
        listView.setLayoutParams(para);
    }

    // 設定選單項點選監聽器
    public void setOnItemClickListener(final OnItemClickListener listener) {
        // this.listener = listener;
        if (listView == null)
            return;

        listView.setOnItemClickListener(new Sys.OnItemClickListener() {

            @Override
            public void run(AdapterView<?> parent, View view, int position,
                    long id) throws Exception {
                // TODO Auto-generated method stub

                if (itemStartList.size() > 1) {
                    // 當組數大於1時計算組內偏移位置，如果選單為二個組時，則要考慮的情況；
                    for (int i = 0; i < itemStartList.size(); i++) {
                        int startI = itemStartList.get(i);
                        int endI = itemStartList.size() > i + 1 ? itemStartList
                                .get(i + 1) : itemList.size();
                        if (position >= startI && position < endI) {
                            setSelIndex(i, position - startI);
                            break;
                        }
                    }
                } else
                    setSelIndex(position);
                dismiss();
                listener.onItemClick(parent, view, position, id);
            }
        });
    }

    /**
     * 批量新增選單項,預設新增到第0組裡
     * 
     * @param items
     */
    public void addItems(String[] items) {

        for (String s : items)
            itemList.add(s);

        if (itemStartList.size() > 1)
            itemStartList.set(1, itemList.size());
    }

    /**
     * @param items
     * @param index
     *            第幾組索引
     */
    public void addItems(String[] items, int index) {
        itemStartList.set(index, itemList.size());

        for (String s : items)
            itemList.add(s);

        if (itemStartList.size() > index + 1)
            itemStartList.set(index + 1, itemList.size());
    }

    // 單個新增選單項
    public void addItem(String item) {
        itemList.add(item);
    }

    // 下拉式 彈出 pop選單 parent 右下角
    public void showAsDropDown(View parent) {
        popupWindow.showAsDropDown(parent, Sys.dp2px(10),
        // 保證尺寸是根據螢幕畫素密度來的
                Sys.dp2px(0));

        // 使其聚集
        popupWindow.setFocusable(true);
        // 設定允許在外點選消失
        popupWindow.setOutsideTouchable(true);
        // 重新整理狀態
        popupWindow.update();
    }

    // 隱藏選單
    public void dismiss() {
        popupWindow.dismiss();
    }

    public int getSelIndex() {
        return indexList.get(0);
    }

    /**
     * @param index
     *            組索引
     * @return
     */
    public int getSelIndex(int index) {
        return indexList.get(index);
    }

    /**
     * 向第0組賦值選中項
     * 
     * @param selIndex
     */
    public void setSelIndex(int selIndex) {
        indexList.set(0, selIndex);
    }

    /**
     * @param index
     *            組索引
     * @param selIndex
     *            對應組的選中值
     */
    public void setSelIndex(int index, int selIndex) {
        indexList.set(index, selIndex);
    }

    // 介面卡
    private final class PopAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return itemList.size();
        }

        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return itemList.get(position);
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            ViewHolder holder;
            if (convertView == null) {
                convertView = LayoutInflater.from(context).inflate(
                        R.layout.pomenu_item, null);
                holder = new ViewHolder();

                convertView.setTag(holder);

                holder.groupItem = (TextView) convertView
                        .findViewById(R.id.textView);

                holder.hint = (ImageView) convertView
                        .findViewById(R.id.ib_hint);
                holder.view_item_line = convertView
                        .findViewById(R.id.view_item_line);

            } else {
                holder = (ViewHolder) convertView.getTag();
            }

            holder.groupItem.setText(itemList.get(position));

            if (itemStartList.size() > 1) {

                for (int i = 0; i < itemStartList.size(); i++) {
                    int startI = itemStartList.get(i);
                    int endI = itemStartList.size() > i + 1 ? itemStartList
                            .get(i + 1) : itemList.size();
                    if (position >= startI && position < endI) {

                        // 考慮到如果有兩組的話，，組與組之間也有分組線，組分隔線的顯示，在xml中未定義。
                        // 如果沒有組組的情況，則可忽略此處程式碼。
                        if (position > 0 && position == startI)
                            holder.view_item_line.setVisibility(View.VISIBLE);
                        else
                            holder.view_item_line.setVisibility(View.GONE);

                        if (position - startI == getSelIndex(i))
                            holder.hint.setVisibility(View.VISIBLE);
                        else
                            holder.hint.setVisibility(View.INVISIBLE);
                        break;
                    }
                }
            } else {
                holder.view_item_line.setVisibility(View.GONE);
                if (position == getSelIndex())
                    holder.hint.setVisibility(View.VISIBLE);
                else
                    holder.hint.setVisibility(View.INVISIBLE);
            }
            holder.view_item_line.setVisibility(View.VISIBLE);
            if (!showDot)
                holder.hint.setVisibility(View.GONE);
            return convertView;
        }

        private final class ViewHolder {
            //文字顯示
            TextView groupItem;
            // 設定選中項的提示圖片；
            ImageView hint;
            //下劃線；可以去掉，或者設定其他顏色；
            View view_item_line;
        }
    }
}