Android(安卓)ViewPager分页功能

仿照Android4.0拨号界面实现分页的界面,如下：

1、ViewPager是安卓的扩展包，可以从源代码out/target/common/obj/JAVA_LIBRARIES/android-support-v13-intermediates/classes.jar拷贝，注意是android-support-V13而不是android-support-v4,因为Activity中getFragmentManager()返回的android.app.FragmentManager对象，而v4中FragmentAdapter的构造函数参数类型android.v4.Fragmentmanager,所以你懂的，不兼容，而v13完美兼容。

2、main.xml布局如下：

<?xml version="1.0" encoding="utf-8"?>

ps:ViewPager加上全路径

3、自定义3个Fragment，Fragment在3.0推出，作用很多，使用方法推荐一个帖子

【eoeandroid索引】android fragment知识汇总
http://www.eoeandroid.com/thread-172624-1-1.html

Fragment的实现如下：

public class Fragment1 extends Fragment {@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {View root = inflater.inflate(R.layout.fragmentlayout1, container, false);return root;}}

其中动态加载的布局fragmentlayout.xml如下：

<?xml version="1.0" encoding="utf-8"?>

Fragment2和Fragment3的实现和1雷同，就不贴出来了

4、Activity中使用ViewPager和Fragment，代码如下：

public class FragmentViewPagerTestActivity extends Activity {private final static String TAG = "FragmentViewPagerTestActivity";private final PageChangeListener mPageChangeListener = new PageChangeListener();private ViewPager vp = null;private final int TAB_INDEX1 = 0;private final int TAB_INDEX2 = 1; private final int TAB_INDEX3 = 2;private final int TAB_INDEX_COUNT = 3;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        findView();        initView();        vp.setOnPageChangeListener(mPageChangeListener);        setupFragment1Tab();        setupFragment2Tab();        setupFragment3Tab();        getActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);        getActionBar().setDisplayShowTitleEnabled(false);        getActionBar().setDisplayShowHomeEnabled(false);            }        private class PageChangeListener implements OnPageChangeListener {    private int mCurrentPosition = -1;    private int mNextPosition = -1;    @Overridepublic void onPageScrollStateChanged(int arg0) {// TODO Auto-generated method stub}@Overridepublic void onPageScrolled(int arg0, float arg1, int arg2) {// TODO Auto-generated method stub}@Overridepublic void onPageSelected(int arg0) {final ActionBar actionBar = getActionBar();if(mCurrentPosition == arg0) {Log.e(TAG , "Previous posion and next position is same");}actionBar.selectTab(actionBar.getTabAt(arg0));mNextPosition = arg0;}public void setCurrentPosition(int position) {mCurrentPosition = position;}        }        private TabListener mTabListener = new TabListener() {    @Overridepublic void onTabReselected(Tab tab, FragmentTransaction ft) {}@Overridepublic void onTabSelected(Tab tab, FragmentTransaction ft) {if(vp.getCurrentItem() != tab.getPosition()) {vp.setCurrentItem(tab.getPosition(),true);}}@Overridepublic void onTabUnselected(Tab tab, FragmentTransaction ft) {}        };        private void setupFragment1Tab() {    Tab tab = getActionBar().newTab();    tab.setText("Fragment1");    tab.setTabListener(mTabListener);    getActionBar().addTab(tab);    }        private void setupFragment2Tab() {    Tab tab = getActionBar().newTab();    tab.setText("Fragment2");    tab.setTabListener(mTabListener);    getActionBar().addTab(tab);    }        private void setupFragment3Tab() {    Tab tab = getActionBar().newTab();    tab.setText("Fragment3");    tab.setTabListener(mTabListener);    getActionBar().addTab(tab);    }       private void findView() {    vp = (ViewPager) findViewById(R.id.viewpagerLayout);    }        private void initView() {    android.app.FragmentManager fm = getFragmentManager();    vp.setAdapter(new MyViewPagerAdapter(fm));    }        public class MyViewPagerAdapter extends FragmentPagerAdapter {public MyViewPagerAdapter(FragmentManager fm) {super(fm);}@Overridepublic Fragment getItem(int arg0) {switch(arg0) {case TAB_INDEX1:return new Fragment1();case TAB_INDEX2:return new Fragment2();case TAB_INDEX3:return new Fragment3();}return null;}@Overridepublic int getCount() {return TAB_INDEX_COUNT;}        }    }

PS:getActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);指定定位模式为TABs，不能少；

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