下拉式导航：
final ActionBar actionBar = getSupportActionBar();
//设置ActionBar是否显示标题
actionBar.setDisplayShowTitleEnabled(false);
//设置导航模式，使用List导航
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
// 为导航设置列表项数据源和监听器
actionBar.setListNavigationCallbacks(
// Specify a SpinnerAdapter to populate the dropdown list.
new ArrayAdapter<String>(//为导航设置列表项
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);//这个this为导航设置监听器ActionBar.OnNavigationListener，如下所示
//当导航被选中时激发该方法
@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;
}
//内部类，根据所选列表id动态创建并返回的Fragment类
public static class PlaceholderFragment extends Fragment {}
ActionBar实现Tab导航：
//设置ActionBar 的Tabs导航
final ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
//FragmentPaperAdapter对象（下面附上），这个适配器根据选择返回对应的Fragment
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
//ViewPaper是Fragment的容器，可以同时管理多个Fragment，并允许多个Fragment切换时提供动画效果，需要为它设置适配器FragmentPagerAdapter
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
// 为ViewPaper设置监听器，当ViewPaper显示的Fragment发生改变时激发该方法
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
// 遍历paperAdapter对象所包含的全部Fragment，每个Fragment对应创建一个Tab标签，并设置ActionBar的事件监听接口对象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);
}
获取第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);
}
//该方法的返回值i表明该Adapter总共包括多少个Fragment
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
//该方法的返回值决定每个Fragment的标题
@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实现导航，分两种：
使用Tab标签页的一般步骤
首先要设计所有的分页的界面布局
Activity继承TabActivity
调用TabActivity的getTabHost()方法获得TabHost对象
通过TabHost创建Tab
TabHost:标签控件核心类，标签的集合
TabHost.TabSpec:标签对象,可以装载View视图。如一个控件或布局
代码说明：
//声明TabHost，然后用LayoutInflater过滤出布局来，给TabHost加上含有Tab页面的FrameLayout
TabHost myTabhost=this.getTabHost();
//从TabActivity上面获取放置Tab的TabHost
LayoutInflater.from(this).inflate(R.layout.main, myTabhost.getTabContentView(), true);
//from(this)从这个TabActivity获取LayoutInflater
//R.layout.main 存放Tab布局
//通过TabHost获得存放Tab标签页内容的FrameLayout
//是否将inflate 拴系到根布局元素上
在TabHost创建一个标签，然后设置一下标题／图标／标签页布局
myTabhost.addTab(myTabhost.newTabSpec("TT")// 造一个新标签TT
.setIndicator("KK",getResources().getDrawable(R.drawable.ajjc))// 设置一下显示的标题为KK，设置一下标签图标为ajjc
.setContent(R.id.widget_layout_red)); //设置一下该标签页的布局内容为R.id.widget_layout_red，这是FrameLayout中的一个子Layout
NavigationDrawer实现Tab导航：
//extends Fragment实现对应导航的回调方法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));
//返回对应的Fragment对象
@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();
}
//该方法的返回值决定每个Fragment的标题
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;
}
}
//设置导航打开时的导航文字显示
public void restoreActionBar() {
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(mTitle);
}
ScrollableTab实现Tab导航：
// 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;
}