fragment是需要放在容器里的 创建容器(LinearLayout,RelativeLayout...)
1 fragment 实例
Fragment fragment = new Fragment();
2 manager 实例
manager = getSupportFragmentManager();
3 开启事务
FragmentTransaction transaction =manager.beginTransaction();
transaction.replace(R.id.content_layout,mHomeFragment);
4 提交事务
transaction.commit();
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