android - Navigation with Tabhost and viewpager, data lost issue -
i build app sliding menu , has tabs created using viewpager. i'm getting issue. first time when run app, data getting on first screen on tabs. when change screen using sliding menu, takes me other fragment , when come home screen, data on tabs goes away. used setretaininstance(true); store view when change orientation. when change orientation, data appears strangly. not able find problem. here code.
mainactivity
public class mainactivity extends fragmentactivity { private drawerlayout mdrawerlayout; private listview mdrawerlist; private actionbardrawertoggle mdrawertoggle; // nav drawer title private charsequence mdrawertitle; // used store app title private charsequence mtitle; // slide menu items private string[] navmenutitles; private typedarray navmenuicons; private arraylist<navdraweritem> navdraweritems; private navdrawerlistadapter adapter; viewpager tab; tabpageradapter tabadapter; actionbar actionbar; private fragmenttabhost mtabhost; private static final string tag_task_fragment = "task_fragment"; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); mtitle = mdrawertitle = gettitle(); // load slide menu items navmenutitles = getresources().getstringarray(r.array.nav_drawer_items); // nav drawer icons resources navmenuicons = getresources() .obtaintypedarray(r.array.nav_drawer_icons); mdrawerlayout = (drawerlayout) findviewbyid(r.id.drawer_layout); mdrawerlist = (listview) findviewbyid(r.id.list_slidermenu); navdraweritems = new arraylist<navdraweritem>(); // adding nav drawer items array // home navdraweritems.add(new navdraweritem(navmenutitles[0], navmenuicons.getresourceid(0, -1))); // find people navdraweritems.add(new navdraweritem(navmenutitles[1], navmenuicons.getresourceid(1, -1))); // photos navdraweritems.add(new navdraweritem(navmenutitles[2], navmenuicons.getresourceid(2, -1))); // communities, add counter here navdraweritems.add(new navdraweritem(navmenutitles[3], navmenuicons.getresourceid(3, -1), true, "22")); // pages navdraweritems.add(new navdraweritem(navmenutitles[4], navmenuicons.getresourceid(4, -1))); // what's hot, add counter here navdraweritems.add(new navdraweritem(navmenutitles[5], navmenuicons.getresourceid(5, -1), true, "50+")); // recycle typed array navmenuicons.recycle(); mdrawerlist.setonitemclicklistener(new slidemenuclicklistener()); // setting nav drawer list adapter adapter = new navdrawerlistadapter(getapplicationcontext(), navdraweritems); mdrawerlist.setadapter(adapter); // enabling action bar app icon , behaving toggle button getactionbar().setdisplayhomeasupenabled(true); getactionbar().sethomebuttonenabled(true); mdrawertoggle = new actionbardrawertoggle(this, mdrawerlayout, r.drawable.ic_drawer, //nav menu toggle icon r.string.app_name, // nav drawer open - description accessibility r.string.app_name // nav drawer close - description accessibility ) { public void ondrawerclosed(view view) { getactionbar().settitle(mtitle); // calling onprepareoptionsmenu() show action bar icons invalidateoptionsmenu(); } public void ondraweropened(view drawerview) { getactionbar().settitle(mdrawertitle); // calling onprepareoptionsmenu() hide action bar icons invalidateoptionsmenu(); } }; mdrawerlayout.setdrawerlistener(mdrawertoggle); if (savedinstancestate == null) { // on first time display view first nav item displayview(0); } /*//testing code adding sliding fragment tabadapter = new tabpageradapter(getsupportfragmentmanager()); tab = (viewpager)findviewbyid(r.id.pager); tab.setonpagechangelistener( new viewpager.simpleonpagechangelistener() { @override public void onpageselected(int position) { actionbar = getactionbar(); actionbar.setselectednavigationitem(position); } }); tab.setadapter(tabadapter); actionbar = getactionbar(); //enable tabs on action bar actionbar.setnavigationmode(actionbar.navigation_mode_tabs); actionbar.tablistener tablistener = new actionbar.tablistener(){ @override public void ontabreselected(android.app.actionbar.tab tab, fragmenttransaction ft) { // todo auto-generated method stub } @override public void ontabselected(actionbar.tab tab, fragmenttransaction ft) { tab.setcurrentitem(tab.getposition()); } @override public void ontabunselected(android.app.actionbar.tab tab, fragmenttransaction ft) { // todo auto-generated method stub }}; //add new tab actionbar.addtab(actionbar.newtab().settext("android").settablistener(tablistener)); actionbar.addtab(actionbar.newtab().settext("ios").settablistener(tablistener)); // actionbar.addtab(actionbar.newtab().settext("windows").settablistener(tablistener)); */ } /** * slide menu item click listener * */ private class slidemenuclicklistener implements listview.onitemclicklistener { @override public void onitemclick(adapterview<?> parent, view view, int position, long id) { // display view selected nav drawer item displayview(position); } } @override public boolean oncreateoptionsmenu(menu menu) { getmenuinflater().inflate(r.menu.main, menu); return true; } @override public boolean onoptionsitemselected(menuitem item) { // toggle nav drawer on selecting action bar app icon/title if (mdrawertoggle.onoptionsitemselected(item)) { return true; } // handle action bar actions click switch (item.getitemid()) { case r.id.action_settings: return true; default: return super.onoptionsitemselected(item); } } /* * * called when invalidateoptionsmenu() triggered */ @override public boolean onprepareoptionsmenu(menu menu) { // if nav drawer opened, hide action items boolean draweropen = mdrawerlayout.isdraweropen(mdrawerlist); menu.finditem(r.id.action_settings).setvisible(!draweropen); return super.onprepareoptionsmenu(menu); } /** * diplaying fragment view selected nav drawer list item * */ private void displayview(int position) { // update main content replacing fragments fragment fragment = null; switch (position) { case 0: fragment = new homefragment(); /*intent = new intent(mainactivity.this,frontactivity.class); startactivity(i);*/ /*intent firstpage= new intent(mainactivity.this,homefragment.class); mainactivity.this.startactivity(firstpage);*/ // toast.maketext(mainactivity.this, "home pressed", toast.length_short).show(); break; case 1: fragment = new findpeoplefragment(); // toast.maketext(mainactivity.this, "find people pressed", toast.length_short).show(); // fragment = new homefragment(); break; case 2: fragment = new photosfragment(); // toast.maketext(mainactivity.this, "photo fragment pressed", toast.length_short).show(); // fragment = new homefragment(); break; case 3: fragment = new communityfragment(); // toast.maketext(mainactivity.this, "communities pressed", toast.length_short).show(); // fragment = new homefragment(); break; case 4: fragment = new pagesfragment(); // toast.maketext(mainactivity.this, "pages pressed", toast.length_short).show(); // fragment = new homefragment(); break; case 5: fragment = new whatshotfragment(); // toast.maketext(mainactivity.this, "what's hot pressed", toast.length_short).show(); // fragment = new homefragment(); break; default: break; } if (fragment != null) { system.out.println("*****on fragment creation"); fragmentmanager fragmentmanager = getfragmentmanager(); fragmentmanager.begintransaction() .replace(r.id.frame_container, fragment).commit(); // update selected item , title, close drawer mdrawerlist.setitemchecked(position, true); mdrawerlist.setselection(position); settitle(navmenutitles[position]); mdrawerlayout.closedrawer(mdrawerlist); } else { // error in creating fragment log.e("mainactivity", "error in creating fragment"); } } @override public void settitle(charsequence title) { mtitle = title; getactionbar().settitle(mtitle); } /** * when using actionbardrawertoggle, must call during * onpostcreate() , onconfigurationchanged()... */ @override protected void onpostcreate(bundle savedinstancestate) { super.onpostcreate(savedinstancestate); // sync toggle state after onrestoreinstancestate has occurred. mdrawertoggle.syncstate(); } @override public void onconfigurationchanged(configuration newconfig) { super.onconfigurationchanged(newconfig); // pass configuration change drawer toggls mdrawertoggle.onconfigurationchanged(newconfig); } } homefragment
public class homefragment extends fragment { private tabhost mtabhost; private viewpager mviewpager; private tabspageradapter mtabsadapter; public homefragment(){} @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { //setretaininstance(true); view rootview = inflater.inflate(r.layout.fragment_home, container, false); return rootview; } @override public void onactivitycreated(bundle savedinstancestate) { // todo auto-generated method stub super.onactivitycreated(savedinstancestate); if(savedinstancestate==null) { toast.maketext(getactivity(), "onactivitycreated", toast.length_short).show(); setretaininstance(true); system.out.println("@@@ if condition @@@@"); mtabhost = (tabhost) getactivity().findviewbyid(android.r.id.tabhost); mtabhost.setup(); log.e("mtabhost", mtabhost + ""); mviewpager = (viewpager) getactivity().findviewbyid(r.id.viewpager); log.e("mviewpager", mviewpager + ""); mtabsadapter = new tabspageradapter((fragmentactivity) getactivity(), mtabhost, mviewpager, getchildfragmentmanager()); // here load content each tab. mtabsadapter.addtab(mtabhost.newtabspec("audience").setindicator("android"), android.class, null); mtabsadapter.addtab(mtabhost.newtabspec("critics").setindicator("ios"), ios.class, null); log.e("mtabsadapter", mtabsadapter + ""); } else { system.out.println("@@@@@ else condition @@@@@"); } } } fragment_home
<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <tabhost android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent" > <linearlayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <framelayout android:id="@android:id/tabcontent" android:layout_width="0dp" android:layout_height="0dp"/> <android.support.v4.view.viewpager android:id="@+id/viewpager" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="1" /> <tabwidget android:id="@android:id/tabs" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > </tabwidget> </linearlayout> </tabhost> </relativelayout> tabspageradapter
public class tabspageradapter extends fragmentpageradapter implements tabhost.ontabchangelistener, viewpager.onpagechangelistener { private final context mcontext; private final tabhost mtabhost; private final viewpager mviewpager; private final arraylist<tabinfo> mtabs = new arraylist<tabinfo>(); static final class tabinfo { private final string tag; private final class<?> clss; private final bundle args; tabinfo(string _tag, class<?> _class, bundle _args) { tag = _tag; clss = _class; args = _args; } } static class dummytabfactory implements tabhost.tabcontentfactory { private final context mcontext; public dummytabfactory(context context) { mcontext = context; } public view createtabcontent(string tag) { view v = new view(mcontext); v.setminimumwidth(0); v.setminimumheight(0); return v; } } public tabspageradapter(fragmentactivity activity, tabhost tabhost, viewpager pager, fragmentmanager fragmentmanager) { //super(fragmentmanager); super(activity.getsupportfragmentmanager()); mcontext = activity; mtabhost = tabhost; mviewpager = pager; mtabhost.setontabchangedlistener(this); mviewpager.setadapter(this); mviewpager.setonpagechangelistener(this); } public void addtab(tabhost.tabspec tabspec, class<?> clss, bundle args) { tabspec.setcontent(new dummytabfactory(mcontext)); string tag = tabspec.gettag(); tabinfo info = new tabinfo(tag, clss, args); mtabs.add(info); mtabhost.addtab(tabspec); notifydatasetchanged(); } @override public int getcount() { return mtabs.size(); } @override public fragment getitem(int position) { tabinfo info = mtabs.get(position); return fragment.instantiate(mcontext, info.clss.getname(), info.args); } public void ontabchanged(string tabid) { int position = mtabhost.getcurrenttab(); mviewpager.setcurrentitem(position); } public string gettag() { return mtabhost.getcurrenttabtag(); } public void onpagescrolled(int position, float positionoffset, int positionoffsetpixels) { int pos = this.mviewpager.getcurrentitem(); this.mtabhost.setcurrenttab(pos); } public void onpageselected(int position) { // unfortunately when tabhost changes current tab, kindly // takes care of putting focus on when not in touch mode. // jerk. // hack tries prevent pulling focus out of our // viewpager. tabwidget widget = mtabhost.gettabwidget(); int oldfocusability = widget.getdescendantfocusability(); widget.setdescendantfocusability(viewgroup.focus_block_descendants); mtabhost.setcurrenttab(position); widget.setdescendantfocusability(oldfocusability); } public void onpagescrollstatechanged(int state) { } } 
i same problem, able resolve it. think in classes imported class android.app fragment. replace file android.support.v4.app , resolve problem.
replace android.app android.support.v4.app
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