在使用getSupportFragmentManager().findFragmentByTag（tag）无法找到，返回为空，，原因由于咋replace（）时必须要将fragment放入到返回栈中。
保证调用以下方法：ft.addToBackStack(tag);
/*** Example of starting nested fragment from another fragment: Fragment* newFragment = ManagerTagFragment.newInstance(tag.getMac()); TagsActivity* tAct = (TagsActivity)getActivity(); tAct.pushFragments(newFragment, true,* true, null);* ————————————————————–* fragement切换** @param fragment* 要切换的界面* @param shouldAnimate* 是否需要动画* @param addToBackStack* 是否添加到返回栈中（只有添加到返回栈中的界面* 才可以使用getSupportFragmentManager().findFragmentByTag* (setting)）找到对应的界面(使用返回键返回后，栈中缓存的界面回收)* @param tag* 界面标志*/public void pushFragments(Fragment fragment, boolean shouldAnimate,boolean addToBackStack, String tag) {FragmentManager manager = getSupportFragmentManager();// getFragmentManager();FragmentTransaction ft = manager.beginTransaction();if (shouldAnimate) {// ft.setCustomAnimations(R.animator.fragment_slide_left_enter,// R.animator.fragment_slide_left_exit,// R.animator.fragment_slide_right_enter,// R.animator.fragment_slide_right_exit);}ft.replace(R.id.sdk_main_content, fragment, tag);// ft.attach(fragment);if (addToBackStack) {/** here you can create named backstack for realize another logic.* ft.addToBackStack("name of your backstack");*/ft.addToBackStack(tag);} else {/** and remove named backstack:* manager.popBackStack("name of your backstack",* FragmentManager.POP_BACK_STACK_INCLUSIVE); or remove whole:* manager.popBackStack(null,* FragmentManager.POP_BACK_STACK_INCLUSIVE);*/manager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);}ft.commit();}
</pre><pre name="code" class="java"></pre><pre name="code" class="java">
美好的生命应该充满期待、惊喜和感激
