Activity嵌Fragment，如何切换时保存当前数据

使用这种用法先熟悉Fragment的生命周期，如下图所示，所以在一个Activity中切换Fragment时，会有数据被清空的情况，下面大致讲下如何保存当前页面数据，不用再次请求网络

Activity切换Fragment的方法如下：注意加粗代码，否则Fragment的getArguments会报null异常

switch (arg0.getId()) {case R.id.home_btu_icon01:CommonTools.applyRotation(home_btu_icon01, 0, 360);setbottomimg(1);if (null == Fragment_Guangchang.getInStanceFragment()) {Fragment_Guangchang fragment = new Fragment_Guangchang();Bundle arguments = new Bundle();       <strong> arguments.putInt("current_id", arg0.getId());</strong>        fragment.setArguments(arguments);setcurrentFragment(fragment);} else {setcurrentFragment(Fragment_Guangchang.getInStanceFragment());}break;

Fragment代码如下

public class Fragment_Luntan extends Base_Fragment {public static Fragment_Luntan inStanceFragment = null;private Bundle savedState;private TextView list_nodata;private ListView luntan_listViews;private JSONArray tongzhijs = new JSONArray();private JSONArray luntan_ja;private LuntanListAdapter lla;private AutoScrollViewPager picviewpager;private LinearLayout contianer;@Overridepublic void onSaveInstanceState(Bundle outState) {saveStateToArguments();super.onSaveInstanceState(outState);}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {View fragmentView = inflater.inflate(R.layout.fragment_luntan,container, false);luntan_listViews = (ListView) fragmentView.findViewById(R.id.luntan_listViews);list_nodata = (TextView) fragmentView.findViewById(R.id.list_nodata);contianer = (LinearLayout) fragmentView.findViewById(R.id.contianer);inStanceFragment = this;return fragmentView;}@Overridepublic void onActivityCreated(@Nullable Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onActivityCreated(savedInstanceState);if (!restoreStateFromArguments()) {getInfo_LuntanAd();get_PatrolData();}}@Overridepublic void onDestroyView() {super.onDestroyView();// Save State HeresaveStateToArguments();}@Overridepublic void onDestroy() {// TODO Auto-generated method stubinStanceFragment = null;super.onDestroy();}private void saveStateToArguments() {if (getView() != null)savedState = saveState();if (savedState != null) {Bundle b = getArguments();b.putBundle("Fragment_Luntan_InternalSavedViewState",savedState);}}private boolean restoreStateFromArguments() {Bundle b = getArguments();if (null != b&& b.getBundle("Fragment_Luntan_InternalSavedViewState") != null) {savedState = b.getBundle("Fragment_Luntan_InternalSavedViewState");restoreState();return true;}return false;}private void restoreState() {if (savedState != null) {onRestoreState(savedState);}}// 恢复数据protected void onRestoreState(Bundle savedInstanceState) {try {tongzhijs = new JSONArray(savedInstanceState.getString("tongzhijs"));contianer.removeAllViews();contianer.addView(initViewPager());luntan_ja = new JSONArray(savedInstanceState.getString("luntan_ja"));if (luntan_ja.length() > 0) {list_nodata.setVisibility(View.GONE);luntan_listViews.setVisibility(View.VISIBLE);lla = new LuntanListAdapter();luntan_listViews.setAdapter(lla);} else {list_nodata.setVisibility(View.VISIBLE);luntan_listViews.setVisibility(View.GONE);}} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}}private Bundle saveState() {Bundle state = new Bundle();onSaveState(state);return state;}// 保存数据protected void onSaveState(Bundle outState) {outState.putString("tongzhijs", tongzhijs.toString());outState.putString("luntan_ja", luntan_ja.toString());}}