Android 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"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/acti_frame">

    <!-- 此处需要给出全路径-->

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpagerLayout"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />
	
</LinearLayout>

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 {

	@Override
	public 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"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
	<TextView android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:text="fragmentlayout1"
	    android:textSize="22sp"
	    android:gravity="center"
	    />
</LinearLayout>

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;
    	
		@Override
		public void onPageScrollStateChanged(int arg0) {
			// TODO Auto-generated method stub
			
		}

		@Override
		public void onPageScrolled(int arg0, float arg1, int arg2) {
			// TODO Auto-generated method stub
			
		}

		@Override
		public 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() {


    	
		@Override
		public void onTabReselected(Tab tab, FragmentTransaction ft) {
			
		}

		@Override
		public void onTabSelected(Tab tab, FragmentTransaction ft) {
			if(vp.getCurrentItem() != tab.getPosition()) {
				vp.setCurrentItem(tab.getPosition(),true);
			}
		}

		@Override
		public 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);
		}

		@Override
		public 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;
		}

		@Override
		public int getCount() {
			return TAB_INDEX_COUNT;
		}
		
		
    	
    }
    
}

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