android viewpager+fragment与利用viewpager滑动分页小技巧
16lz
2022-06-14
一：简单的实现viewpage进行fragment的滑动切换
public class LcVpFragment extends Fragment{@Overridepublic void onActivityCreated(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onActivityCreated(savedInstanceState);List listviews = new ArrayList();TransFragment trs = new TransFragment();trs.setArguments(getArguments());//传参数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); }@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// TODO Auto-generated method stubreturn inflater.inflate(R.layout.myviewpager, container, false);//return super.onCreateView(inflater, container, savedInstanceState);}} 继承Fragment适配器FragmentPagerAdapter,Fragment的适配器比较简单
public class TransFragmentPagerAdapter extends FragmentPagerAdapter {List fragments; public TransFragmentPagerAdapter(FragmentManager fm,List _fragments){super(fm);this.fragments = _fragments;}public TransFragmentPagerAdapter(FragmentManager fm) {super(fm);// TODO Auto-generated constructor stub}@Overridepublic Fragment getItem(int arg0) {// TODO Auto-generated method stubreturn fragments.get(arg0);}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn fragments.size();}} 二:利用viewpager滑动分页1(不推荐，使用setCurrentItem(1)始终效果不理想，而且滑动后需要重新加载数据)
滑动分页技巧,viewpager里边添加三个fragment，其中两个先显示进度条,
有三个fragment就可以向右向左滑动，以模拟上一页下一页,当滑动到其他页就加载数据,加载完后设置myviewpage.setCurrentItem(1),
就又可以进行左右滑动了,由于设置myviewpage.setCurrentItem(1)不要有滑动效果不然用户不友好，可以反射改变etCurrentItem(1)
的速度http://blog.csdn.net/aojiancc2/article/details/40427207
这里要主要几点,viewpager进行fragment管理时生命周期是比如ViewPager有5个page，刚打开的时候，会加载page1和page2.....，我们手动切换到page2的时候，会加载page3，切换到page3的时候，加载page4的同时会destory掉page1
所以不要想到滑动到下一页的时候会执行分页fragment的创建方法,应该自己写数据获得方法,自己在滑动结束事件里边调用
1:创建分页滑动viewpager主容器，这里也是一个fragment
public class LcVpFragment extends Fragment{@Overridepublic void onActivityCreated(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onActivityCreated(savedInstanceState);List listviews = new ArrayList(); ViewPager myviewpage = (ViewPager)getActivity().findViewById(R.id.trans_page); TransFragment trs = new TransFragment();trs.setArguments(getArguments());//传参数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);}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// TODO Auto-generated method stubreturn inflater.inflate(R.layout.myviewpager, container, false);}} 2：为viewpager设置滑动事件这里很关键
class MyOnPageChangeListener implements OnPageChangeListener{int currentpage = 1;ViewPager myviewpage;List listviews;public MyOnPageChangeListener(ViewPager _myviewpage,List _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 stubif(_current==0)//上一页{if(currentpage == 1)//已经是第一页了{myviewpage.setCurrentItem(1);return;}currentpage--;}else if(_current==2)//下一页{currentpage++;}//获取到分页fragment执行GetData查询当前页数据,然后把数据传递到展示数据的fragment在进行切换即可NextPagerFragment nex = (NextPagerFragment)listviews.get(_current);nex.GetData(currentpage);} } 3:分页fragment
public class NextPagerFragment extends Fragment{ViewPager myviewpage;TransFragment trs;public NextPagerFragment(ViewPager _myviewpage,TransFragment _trs){myviewpage = _myviewpage;trs = _trs;}@Overridepublic void onActivityCreated(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onActivityCreated(savedInstanceState);}public void GetData(int current){ System.out.println("当前第几页："+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));//为数据展示的fragment加载数据myviewpage.setCurrentItem(1);//然后进行切换 }};@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// TODO Auto-generated method stubreturn inflater.inflate(R.layout.nextpager, container, false);}}public class TransFragment extends Fragment{@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// TODO Auto-generated method stubreturn 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){//加载数据即可}@Overridepublic void onActivityCreated(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onActivityCreated(savedInstanceState);GetData();}}http://www.cnblogs.com/tiantianbyconan/p/3364728.html
http://www.2cto.com/kf/201404/292031.html
三：利用viewpager滑动分页2
其实viewpager添加多个fragment，利用他的加载方式可以很轻松的实现滑动分页
1:加载需要分页的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
注意这里fragment所有的控件都要后台新生成,因为都是用的同一个类，如果加载同一个布局文件会有冲突
LinearLayout layout;@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// TODO Auto-generated method stublayout=new LinearLayout(getActivity()); ViewGroup.LayoutParams params = new ViewGroup.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT); layout.setOrientation(LinearLayout.VERTICAL);//显示方向 layout.setLayoutParams(params); return layout;//return inflater.inflate(R.layout.mytable_trans, container, false);//return super.onCreateView(inflater, container, savedInstanceState);}@Overridepublic void onActivityCreated(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onActivityCreated(savedInstanceState);int cpage = getArguments().getInt("cpage");GetData(cpage);}当然在需要的时候可以调用fragment集合,取出需要的fragment调用getdata方法，实现刷新，例如
public void onPageSelected(int _current) {((CargoinfoFragment) listviews.get(_current)).GetData(_current);} 当删除了需要刷新时，可以在FragmentActivity类重新加载一次分页的fragemt，但是要注意先把以前的删除掉，不能数据可能会错乱
public void switchContent(Fragment fragment,boolean isdelete) {if(isdelete){List li = getSupportFragmentManager().getFragments(); for(int i=0;i
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