希望页面切换时，一直保留底部导航栏，而底栏含有一个home键，点击无论当前在哪个界面，必须回到首页，Activity无法满足需求，就需要使用Fragment了 那么，最关键的问题，我总结了一下几点： 1.Fragment和Fragment切换逻辑及数据传递 2.Fragment和Activity切换逻辑及数据传递 3.界面返回键逻辑 4.手机返回键逻辑 5.底栏HOME键逻辑

6.Fragment的onActivityResult

MainActivity(继承FragmentActivity)装载管理全部fragment,所以切换的逻辑处理方法就定义在MainActivity中 1.Fragment和Fragment切换逻辑及数据传递

MainActivity#initFragment

public static void initFragment(Fragment f) { changeFragment(f, true, null); } MainActivity的onCreate初始化首页Fragment EntranceFragment mEntranceFragment = new EntranceFragment(); initFragment(mEntranceFragment); MainActivity# changeFragment public static void changeFragment(Fragment f) { changeFragment(f, false, null); } public static void changeFragment(Fragment f, Bundle bundle) { changeFragment(f, false, bundle); } private static void changeFragment(Fragment f, boolean init, Bundle bundle) { FragmentTransaction ft = fm.beginTransaction(); if (bundle != null) { f.setArguments(bundle); } // ft.setCustomAnimations( // R.anim.fragment_slide_right_in, R.anim.fragment_slide_left_out, // R.anim.fragment_slide_left_in, R.anim.fragment_slide_right_out) // .replace(R.id.fy_content, f); ft.replace(R.id.fy_content, f); if (!init) { ft.addToBackStack(null); } ft.commit(); } Fragment接收数据 Bundle bundle = getArguments(); serviceItem = bundle.getParcelable("serviceItem"); MainActivity# intentToFragment public static void intentToFragment(Fragment fragment, ServiceItem serviceItem){ Bundle bundle = new Bundle(); bundle.putParcelable("serviceItem", serviceItem); MainActivity.changeFragment(fragment, bundle); }

Fragment中使用

MainActivity.intentToFragment(new HomeInstrumentActivity(), mServiceItems.get(position));

2.Fragment和Activity切换逻辑及数据传递

MainActivity#intentToActivity

public void intentToActivity(Class<?> clazz, ServiceItem serviceItem) { Intent i = new Intent(context, clazz); Bundle b = new Bundle(); b.putParcelable("serviceItem", serviceItem); i.putExtras(b); startActivity(i); }

Fragment中使用

MainActivity.intentToFragment(XXX.class, null); MainActivity.intentToFragment(XXX.class, mServiceItems.get(position); 3.界面返回键逻辑

MainActivity#backToFragment

public static void backToFragment(){ fm.popBackStack(); }

Fragment中使用

@OnClick(R.id.rl_back) public void back() { MainActivity.backToFragment(); }

4.手机返回键逻辑 MainActivity#onKeyDown

@Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK) { backToFragment(); if(fm.getBackStackEntryCount()==0){ finish(); } return true; } return super.onKeyDown(keyCode, event); }

5.底栏HOME键逻辑

@OnClick(R.id.ly_tab_menu_home) public void tab_menu_home() { Log.v("JJ", "首页"); setSelected(); tab_menu_home.setSelected(true); fm.popBackStackImmediate(null, 1); }

6.Fragment的onActivityResult Fragment中使用

@OnClick(R.id.tv_hospital_area) public void hospital_area() { tv_hostpital.setText(""); Intent intent = new Intent(getActivity(), HospitalAndDepartmentActivity.class); Bundle b = new Bundle(); b.putString("HD", "Area"); intent.putExtras(b); this.startActivityForResult(intent, REQUESTCODE); }

最后，关于fragment返回栈生命周期问题，可参考：  http://www.jianshu.com/p/fe16553ca2ca 用于解决点击返回键时，确定fragment加载数据时机

清空Fragment回退栈中某个Fragment之上的所有Fragment，可参考：http://www.cnblogs.com/qixing/p/4015262.html