Fragment的初步用法

一、添加到container

fragmentManager = getSupportFragmentManager();        /**         * 开启事务         */        fragmentTransaction = fragmentManager.beginTransaction();        login_fragment = new Login_Fragment();        fragmentTransaction.add(R.id.container, login_fragment);        /**         * 提交事务         */        fragmentTransaction.commit();

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二、在同一个container的切换，A到B

LoginSecondStep_Fragment loginSecondStep_fragment = LoginSecondStep_Fragment.getMe(phone, AorB, ifSendPhone);        loginSecondStep_fragment.setIfSendPhone(ifSendPhone);        FragmentManager fm = getActivity().getSupportFragmentManager();        FragmentTransaction ft = fm.beginTransaction();        ft.replace(R.id.container, loginSecondStep_fragment);        ft.addToBackStack(null);        ft.commit();

此时，A的生命周期执行到onPause–>onDestory–>onDestoryView

从B再返回到A，A的生命周期执行：
onCreateView –>onViewCreated–>onActivityCreated–>onStart–>onResume

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so 一定要借助生命周期！！！

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fragment生命周期，看这篇就够了
原著