Activity-Fragment存储与返回

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package TokenLeiBao;import java.lang.ref.SoftReference;import java.util.HashMap;import android.support.v4.app.Fragment;import FragmentLeiBao.CaoMaFragment;import FragmentLeiBao.ChakanFragment;import FragmentLeiBao.DiaochaFragment;import FragmentLeiBao.ViewDiaochaFragment;import FragmentLeiBao.ViewGerensFragment;import FragmentLeiBao.ViewGopgeFragment;import FragmentLeiBao.ViewPhotoFragment;import FragmentLeiBao.ViewXiugaiFragment;import FragmentLeiBao.ViewYonghuFragment;import FragmentLeiBao.ViewChouquFragment;import FragmentLeiBao.ViewxianchaFragment;import FragmentLeiBao.ViewxuanFragment;public class ViewIndex {   public static final int TEST1_VIEW= 0;   public static final int VIEW_LOGIN = 1;   public static final int VIEW_SURVEY_LIST = 2;   public static final int VIEW_USER_CENTER = 3;   public static final int VIEW_SURVEY_DETAIL = 4;   public static final int VIEW_SURVEY_Nu = 5;   public static final int View_SID_Niu=6;   public static final int View_Chou_Qi=7;   public static final int View_Cha_kan=8;   public static final int View_Xuan_Ze=9;   public static final int View_Xuan_cha=11;   public static final int VIEW_USER_CENTE = 12;   public static final int VIEW_Sao_Ma = 13;// /**   public static final int SWITCHINDEX_0 = 0;   public static final int SWITCHINDEX_1 = 1;   public static HashMap<String, SoftReference<Fragment>> viewMap = new HashMap<String, SoftReference<Fragment>>();   public static Fragment getView(int index){      Fragment contentViewTemp = null;      SoftReference<Fragment> ref = viewMap.get(""+index);      if(ref!=null){         if(ref.get()!=null){            contentViewTemp = ref.get();            if(contentViewTemp!=null){               if(contentViewTemp.getActivity()!=null&&                     contentViewTemp.getActivity().isFinishing()){                  viewMap.remove(ref);                  contentViewTemp = null;               }            }         }      }//每新建一个Fragment须在此注册


 Fragment contentView = null;      int switchIndex = index/10;/*0至第10个Fragment*/      try {         switch(switchIndex){            case SWITCHINDEX_0:               switch(index){                  case VIEW_LOGIN:                     contentView = contentViewTemp==null?new ViewGopgeFragment():contentViewTemp;
                     break;                  case VIEW_SURVEY_LIST:                     contentView = contentViewTemp==null?new DiaochaFragment():contentViewTemp;                     break;                   case VIEW_USER_CENTER:                     contentView = contentViewTemp==null?new ViewGerensFragment():contentViewTemp;                     break;                  case VIEW_SURVEY_DETAIL:                     contentView = contentViewTemp==null?new ViewXiugaiFragment():contentViewTemp;                     break;                  case VIEW_SURVEY_Nu:                     contentView = contentViewTemp==null?new ViewYonghuFragment():contentViewTemp;                     break;                  case View_SID_Niu:                     contentView = contentViewTemp==null?new ViewDiaochaFragment():contentViewTemp;                     break;                  case View_Chou_Qi:                     contentView = contentViewTemp==null?new ViewChouquFragment():contentViewTemp;                     break;                  case View_Cha_kan:                     contentView = contentViewTemp==null?new ChakanFragment():contentViewTemp;                     break;                  case View_Xuan_Ze:                     contentView = contentViewTemp==null?new ViewxuanFragment():contentViewTemp;                     break;               }               break;            case SWITCHINDEX_1:/*11至第20个Fragment*/                     switch (index){                   case View_Xuan_cha:                      contentView = contentViewTemp==null?new ViewxianchaFragment():contentViewTemp;                      break;                   case VIEW_USER_CENTE:                      contentView = contentViewTemp==null?new ViewPhotoFragment():contentViewTemp;                      break;                   case VIEW_Sao_Ma:                      contentView = contentViewTemp==null?new CaoMaFragment():contentViewTemp;                      break;                }               break;         }         if(contentViewTemp==null){            SoftReference<Fragment> ref0 =  new SoftReference<Fragment>(contentView);            viewMap.put(""+index, ref0);         }      } catch (Exception e) {         e.printStackTrace();      } catch(OutOfMemoryError e){           e.printStackTrace();           viewMap.clear();           System.gc();           System.gc();           System.gc();        }      return contentView;   }}

Activity类：

/*切换线性布局显示不同Fragment*/        changeFragment(ViewIndex.VIEW_LOGIN, null);fragment类：View view = inflater.inflate(R.layout.shopping_main,container,false);return view;

如果过要做保存：

搜索：Android-Fragment-界面保存


使用前先进入ViewIndex类，添加fragment类


后退：    Operation pre = ((MainActivity)getActivity()).accessedViews.pop();//从栈空间里面将上一条数据抛出来
                ((MainActivity)getActivity()).changeFragment(pre.getCode(), pre.getBundle(), false);
                
                
                
页面切换：  ((MainActivity) getActivity()).changeFragment(ViewIndex.View_Cha_kan, null);
               
               注：ViewIndex.VIEW_SURVEY_LIST为你想要跳转的页面，ViewIndex类可以添加Fragment
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