Android 導航類型

下拉式導航：

    final ActionBar actionBar = getSupportActionBar();
        //設置ActionBar是否顯示標題
        actionBar.setDisplayShowTitleEnabled(false);
        //設置導航模式，使用List導航
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);

        // 為導航設置列表項數據源和監聽器
        actionBar.setListNavigationCallbacks(
                // Specify a SpinnerAdapter to populate the dropdown list.
                new ArrayAdapter(//為導航設置列表項
                        actionBar.getThemedContext(),
                        android.R.layout.simple_list_item_1,
                        android.R.id.text1,
                        new String[] {
                                getString(R.string.title_section1),
                                getString(R.string.title_section2),
                                getString(R.string.title_section3),
                        }),
                this);//這個this為導航設置監聽器ActionBar.OnNavigationListener，如下所示
                          
		//當導航被選中時激發該方法
		@Override
		public boolean onNavigationItemSelected(int position, long id) {
		    // When the given dropdown item is selected, show its contents in the
		    // container view.
		    getSupportFragmentManager().beginTransaction()
		            .replace(R.id.container, PlaceholderFragment.newInstance(position + 1))
		            .commit();
		    return true;
		}
		//內部類，根據所選列表id動態創建並返回的Fragment類
		public static class PlaceholderFragment extends Fragment {}

ActionBar實現Tab導航：

//設置ActionBar 的Tabs導航
        final ActionBar actionBar = getSupportActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        //FragmentPaperAdapter對象（下面附上），這個適配器根據選擇返回對應的Fragment
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

		//ViewPaper是Fragment的容器，可以同時管理多個Fragment，並允許多個Fragment切換時提供動畫效果，需要為它設置適配器FragmentPagerAdapter
        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        // 為ViewPaper設置監聽器，當ViewPaper顯示的Fragment發生改變時激發該方法
        mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                actionBar.setSelectedNavigationItem(position);
            }
        });

        // 遍歷paperAdapter對象所包含的全部Fragment，每個Fragment對應創建一個Tab標簽，並設置ActionBar的事件監聽接口對象TabListener
        for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
            // Create a tab with text corresponding to the page title defined by
            // the adapter. Also specify this Activity object, which implements
            // the TabListener interface, as the callback (listener) for when
            // this tab is selected.
            actionBar.addTab(
                    actionBar.newTab()
                            .setText(mSectionsPagerAdapter.getPageTitle(i))
                            .setTabListener(this)
            );
        }
        
		public class SectionsPagerAdapter extends FragmentPagerAdapter {

		    public SectionsPagerAdapter(FragmentManager fm) {
		        super(fm);
		    }
			獲取第position位置的Fragment
		    @Override
		    public Fragment getItem(int position) {
		        // getItem is called to instantiate the fragment for the given page.
		        // Return a PlaceholderFragment (defined as a static inner class below).
		        return PlaceholderFragment.newInstance(position + 1);
		    }
			//該方法的返回值i表明該Adapter總共包括多少個Fragment
		    @Override
		    public int getCount() {
		        // Show 3 total pages.
		        return 3;
		    }
			//該方法的返回值決定每個Fragment的標題
		    @Override
		    public CharSequence getPageTitle(int position) {
		        Locale l = Locale.getDefault();
		        switch (position) {
		            case 0:
		                return getString(R.string.title_section1).toUpperCase(l);
		            case 1:
		                return getString(R.string.title_section2).toUpperCase(l);
		            case 2:
		                return getString(R.string.title_section3).toUpperCase(l);
		        }
		        return null;
		    }
		}

TabHost實現導航，分兩種：

使用Tab標簽頁的一般步驟
首先要設計所有的分頁的界面布局
Activity繼承TabActivity
調用TabActivity的getTabHost()方法獲得TabHost對象
通過TabHost創建Tab


TabHost:標簽控件核心類，標簽的集合
TabHost.TabSpec:標簽對象,可以裝載View視圖。如一個控件或布局

代碼說明：

//聲明TabHost，然後用LayoutInflater過濾出布局來，給TabHost加上含有Tab頁面的FrameLayout
	TabHost myTabhost=this.getTabHost();
	//從TabActivity上面獲取放置Tab的TabHost
	LayoutInflater.from(this).inflate(R.layout.main, myTabhost.getTabContentView(), true);
	//from(this)從這個TabActivity獲取LayoutInflater
	//R.layout.main 存放Tab布局　　
	//通過TabHost獲得存放Tab標簽頁內容的FrameLayout　　
	//是否將inflate 拴系到根布局元素上
	在TabHost創建一個標簽，然後設置一下標題／圖標／標簽頁布局
　　myTabhost.addTab(myTabhost.newTabSpec("TT")// 造一個新標簽TT
　　　　    .setIndicator("KK",getResources().getDrawable(R.drawable.ajjc))// 設置一下顯示的標題為KK，設置一下標簽圖標為ajjc　　  
　　　　    .setContent(R.id.widget_layout_red));　 //設置一下該標簽頁的布局內容為R.id.widget_layout_red，這是FrameLayout中的一個子Layout

NavigationDrawer實現Tab導航：

	//extends Fragment實現對應導航的回調方法public void onNavigationDrawerItemSelected(int position) 
	implements NavigationDrawerFragment.NavigationDrawerCallbacks 

 	mNavigationDrawerFragment = (NavigationDrawerFragment)
                getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
        mTitle = getTitle();

        // Set up the drawer.
        mNavigationDrawerFragment.setUp(
                R.id.navigation_drawer,
                (DrawerLayout) findViewById(R.id.drawer_layout));
     
    //返回對應的Fragment對象           
     @Override
    public void onNavigationDrawerItemSelected(int position) {
        // update the main content by replacing fragments
        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction()
                .replace(R.id.container, PlaceholderFragment.newInstance(position + 1))
                .commit();
    }
    
    //該方法的返回值決定每個Fragment的標題
    public void onSectionAttached(int number) {
        switch (number) {
            case 1:
                mTitle = getString(R.string.title_section1);
                break;
            case 2:
                mTitle = getString(R.string.title_section2);
                break;
            case 3:
                mTitle = getString(R.string.title_section3);
                break;
        }
    }               
	//設置導航打開時的導航文字顯示
	public void restoreActionBar() {
        ActionBar actionBar = getSupportActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
        actionBar.setDisplayShowTitleEnabled(true);
        actionBar.setTitle(mTitle);
    }

ScrollableTab實現Tab導航：

// Create the adapter that will return a fragment for each of the three
		// primary sections of the app.
		mSectionsPagerAdapter = new SectionsPagerAdapter(
				getSupportFragmentManager());

		// Set up the ViewPager with the sections adapter.
		mViewPager = (ViewPager) findViewById(R.id.pager);
		mViewPager.setAdapter(mSectionsPagerAdapter);
		
		
	public class SectionsPagerAdapter extends FragmentPagerAdapter {

		public SectionsPagerAdapter(FragmentManager fm) {
			super(fm);
		}

		@Override
		public Fragment getItem(int position) {
			// getItem is called to instantiate the fragment for the given page.
			// Return a DummySectionFragment (defined as a static inner class
			// below) with the page number as its lone argument.
			Fragment fragment = new DummySectionFragment();
			Bundle args = new Bundle();
			args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
			fragment.setArguments(args);
			return fragment;
		}

		@Override
		public int getCount() {
			// Show 3 total pages.
			return 3;
		}

		@Override
		public CharSequence getPageTitle(int position) {
			Locale l = Locale.getDefault();
			switch (position) {
			case 0:
				return getString(R.string.title_section1).toUpperCase(l);
			case 1:
				return getString(R.string.title_section2).toUpperCase(l);
			case 2:
				return getString(R.string.title_section3).toUpperCase(l);
			}
			return null;
		}