android viewpager+fragment與利用viewpager滑動分頁小技巧

一：簡單的實現viewpage進行fragment的滑動切換

public class LcVpFragment extends Fragment{

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onActivityCreated(savedInstanceState);

        List<Fragment> listviews  = new ArrayList<Fragment>();

        TransFragment trs = new TransFragment();
        trs.setArguments(getArguments());//傳參數

        listviews.add(new NextPagerFragment());
        listviews.add(trs);
        listviews.add(new NextPagerFragment());

         ViewPager myviewpage = (ViewPager)getActivity().findViewById(R.id.trans_page);
         TransFragmentPagerAdapter mypagetadapter = new TransFragmentPagerAdapter(getActivity().getSupportFragmentManager(),listviews);
         myviewpage.setAdapter(mypagetadapter);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        return inflater.inflate(R.layout.myviewpager, container, false);
        //return super.onCreateView(inflater, container, savedInstanceState);
    }
}

繼承Fragment適配器FragmentPagerAdapter,Fragment的適配器比較簡單

public class TransFragmentPagerAdapter extends FragmentPagerAdapter {

    List<Fragment> fragments;
    public TransFragmentPagerAdapter(FragmentManager fm,List<Fragment> _fragments)
    {
        super(fm);
        this.fragments = _fragments;
    }

    public TransFragmentPagerAdapter(FragmentManager fm) {
        super(fm);
        // TODO Auto-generated constructor stub
    }

    @Override
    public Fragment getItem(int arg0) {
        // TODO Auto-generated method stub
        return fragments.get(arg0);
    }

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

二:利用viewpager滑動分頁1(不推薦，使用setCurrentItem(1)始終效果不理想，而且滑動後需要重新加載數據)

滑動分頁技巧,viewpager裏邊添加三個fragment，其中兩個先顯示進度條,

 有三個fragment就可以向右向左滑動，以模擬上一頁下一頁,當滑動到其他頁就加載數據,加載完後設置myviewpage.setCurrentItem(1),

 就又可以進行左右滑動了,由於設置myviewpage.setCurrentItem(1)不要有滑動效果不然用戶不友好，可以反射改變etCurrentItem(1)

 的速度http://blog.csdn.NET/aojiancc2/article/details/40427207

這裏要主要幾點,viewpager進行fragment管理時生命週期是比如ViewPager有5個page，剛打開的時候，會加載page1和page2.....，我們手動切換到page2的時候，會加載page3，切換到page3的時候，加載page4的同時會destory掉page1

所以不要想到滑動到下一頁的時候會執行分頁fragment的創建方法,應該自己寫數據獲得方法,自己在滑動結束事件裏邊調用

1:創建分頁滑動viewpager主容器，這裏也是一個fragment

public class LcVpFragment extends Fragment{

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onActivityCreated(savedInstanceState);

        List<Fragment> listviews  = new ArrayList<Fragment>();


         ViewPager myviewpage = (ViewPager)getActivity().findViewById(R.id.trans_page);

            TransFragment trs = new TransFragment();
            trs.setArguments(getArguments());//傳參數
            NextPagerFragment next =new NextPagerFragment(myviewpage,trs);
            next.setArguments(getArguments());
            NextPagerFragment previous =new NextPagerFragment(myviewpage,trs);
            previous.setArguments(getArguments());

            listviews.add(previous);
            listviews.add(trs);
            listviews.add(next);


         TransFragmentPagerAdapter mypagetadapter = new TransFragmentPagerAdapter(getActivity().getSupportFragmentManager(),listviews);
         myviewpage.setAdapter(mypagetadapter);

         myviewpage.setCurrentItem(1);

         MyOnPageChangeListener mo = new MyOnPageChangeListener(myviewpage,listviews);
         myviewpage.setOnPageChangeListener(mo);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        return inflater.inflate(R.layout.myviewpager, container, false);
    }
}

2：爲viewpager設置滑動事件這裏很關鍵

class MyOnPageChangeListener implements OnPageChangeListener
{

    int currentpage = 1;
    ViewPager myviewpage;
    List<Fragment> listviews;

    public MyOnPageChangeListener(ViewPager _myviewpage,List<Fragment> _listviews)
    {
        listviews = _listviews;
        myviewpage = _myviewpage;
    }

    public void onPageScrollStateChanged(int arg0) {
        // TODO Auto-generated method stub

    }

    public void onPageScrolled(int _current, float arg1, int arg2) {

    }

    public void onPageSelected(int _current) {
        if(_current == 1)
            return;

        // TODO Auto-generated method stub
        if(_current==0)//上一頁
        {
            if(currentpage == 1)//已經是第一頁了
            {
                myviewpage.setCurrentItem(1);
                return;
            }
            currentpage--;
        }
        else if(_current==2)//下一頁
        {
            currentpage++;
        }

        //獲取到分頁fragment執行GetData查詢當前頁數據,然後把數據傳遞到展示數據的fragment在進行切換即可
        NextPagerFragment nex = (NextPagerFragment)listviews.get(_current);
        nex.GetData(currentpage);
    }
}

3:分頁fragment

public class NextPagerFragment extends Fragment{

    ViewPager myviewpage;
    TransFragment trs;
    public NextPagerFragment(ViewPager _myviewpage,TransFragment _trs)
    {
        myviewpage = _myviewpage;
        trs = _trs;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onActivityCreated(savedInstanceState);
    }

    public void GetData(int current)
    {
         System.out.println("當前第幾頁："+current);
         String phpsession = getArguments().getString("laravel_session");
         new TransportationData().getData_hp(phpsession,new Action()
         {
            public void action(String _data) {
                 Message message = new Message();
                 message.obj = _data;
                 handler.sendMessage(message);
            }
         },current);
    }

    @SuppressLint("HandlerLeak")
    final Handler handler = new Handler(){
        public void handleMessage(Message msg) {
            trs.SetPageData(String.valueOf(msg.obj));//爲數據展示的fragment加載數據
            myviewpage.setCurrentItem(1);//然後進行切換
        }
    };

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        return inflater.inflate(R.layout.nextpager, container, false);
    }
}

4：負責數據顯示的frament這裏給出簡單的展示

public class TransFragment extends Fragment{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        return inflater.inflate(R.layout.mytable_trans, container, false);
        //return super.onCreateView(inflater, container, savedInstanceState);
    }

    public void SetPageData(String _pagedata)
    {
        setData(String.valueOf(_pagedata));
    }

    public void setData(String _data)
    {
        //加載數據即可
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onActivityCreated(savedInstanceState);
        GetData();
    }
}

http://www.cnblogs.com/tiantianbyconan/p/3364728.html

http://www.360doc.com/content/13/1115/23/14218823_329558883.shtml

http://www.2cto.com/kf/201404/292031.html

三：利用viewpager滑動分頁2

其實viewpager添加多個fragment，利用他的加載方式可以很輕鬆的實現滑動分頁

1:加載需要分頁的fragment

for(int i=0;i<4;i++)
       {
           Bundle bu = new Bundle();
           bu.putInt("cpage",i+1);
           TransFragment trs = new TransFragment();
           trs.setArguments(bu);
           listviews.add(trs);
       }

2：fragment

注意這裏fragment所有的控件都要後臺新生成,因爲都是用的同一個類，如果加載同一個佈局文件會有衝突

LinearLayout layout;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        layout=new LinearLayout(getActivity());
          ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT);
        layout.setOrientation(LinearLayout.VERTICAL);//顯示方向
        layout.setLayoutParams(params);

        return layout;
        //return inflater.inflate(R.layout.mytable_trans, container, false);
        //return super.onCreateView(inflater, container, savedInstanceState);
    }

@Override
    public void onActivityCreated(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onActivityCreated(savedInstanceState);
        int cpage = getArguments().getInt("cpage");
        GetData(cpage);
    }

當然在需要的時候可以調用fragment集合,取出需要的fragment調用getdata方法，實現刷新，例如

public void onPageSelected(int _current) {
        ((CargoinfoFragment) listviews.get(_current)).GetData(_current);
    }

當刪除了需要刷新時，可以在FragmentActivity類重新加載一次分頁的fragemt，但是要注意先把以前的刪除掉，不能數據可能會錯亂

public void switchContent(Fragment fragment,boolean isdelete) {

        if(isdelete){
            List<Fragment> li = getSupportFragmentManager().getFragments();
            for(int i=0;i<li.size();i++)
            {
                Fragment f=li.get(i);
                System.out.println("類型:"+f.getClass());
                getSupportFragmentManager().beginTransaction().remove(f).commit();
            }
        }
        try{
        getSupportFragmentManager()
        .beginTransaction()
        .replace(R.id.bt,fragment)
        .addToBackStack("msg_fragment")//返回鍵不回來
        .commit();
        }
        catch(Exception e)
        {
            System.out.println("主類調用異常:"+e);
        }
    }