android中在切换fragment时，怎样做到无需重复加载数据的方法。

private Fragment mContent;//定义了当前页面所在的fragmnet@Overridepublic void onCreate(@Nullable Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    //初始化所要用到的fragment    allFragment=RankItemFragment.newInstance("0","0");    highFragment=RankItemFragment.newInstance("1","1");    newFragment=RankItemFragment.newInstance("2","2");    inFragment=RankItemFragment.newInstance("3","3");    //放入初始默认的fragment    fm = getActivity().getSupportFragmentManager();    FragmentTransaction ft = fm.beginTransaction();    ft.add(R.id.rankContent,allFragment).commit();    mContent=allFragment;}//切换fragment时，不需要重新加载数据的方法 private void switchContent(Fragment target) {     if (mContent != target) {         FragmentTransaction transaction = fm.beginTransaction();         if (!target.isAdded()) {    // 先判断是否被add过             //这里的每个fragment的布局都是放到id为rankContent的LinearLayout之上             transaction.hide(mContent).add(R.id.rankContent, target).commit();          } else {             transaction.hide(mContent).show(target).commit(); // 隐藏当前的fragment，显示下一个         }         mContent=target;     } } //点击切换，调用switchContent方法 @Override public void onClick(View v) {     switch (v.getId()) {         case R.id.tv_allRank:         switchContent(allFragment);         break;         case R.id.tv_highGood:         switchContent(highFragment);         break;          case R.id.tv_newGame:         switchContent(newFragment);         break;         case R.id.tv_interest:         switchContent(inFragment);         break;     } }

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