android - Fragment still displayed on screen when back key while refreshing with SwipeRefreshLayout -
i have activity 2 fragments: , b. added on activity. after click button:
ft.replace(containerid, b, tag); ft.addtobackstack("a"); ft.commit(); b displayed , removed normally. pull refresh , press while progress loading:
// implementation in onbackpressed() .... int backstackentrycount = fm.getbackstackentrycount(); if (backstackentrycount > 0) { fm.popbackstackimmediate(); } .... the problem fragment b still displayed on screen (blank) , overlap fragment a, if again app exit. information b:
- i implemented swiperefreshlayout on b
here b source code:
public class b extends myfragment { protected view view; protected listview listview; protected imageview progress; protected textview notiftext; protected layoutinflater inflater; protected ptrbaseadapter adapter; protected swiperefreshlayout mswiperefreshlayout; protected string emptytext; protected boolean fromrest; protected int loads = 0; protected float mpreviousx = 0; protected float mpreviousy = 0; protected void dorefresh(boolean fromrest) { if (!isadded()) return; notiftext.setvisibility(view.gone); fetchfromdatabase(); if (fromrest) { refresh(); } } private void fetchfromdatabase() { /* fetch data db here , got "list" */ adapter = new eventadapter(list); listview.setadapter(adapter); loads++; if (adapter.getcount() == 0) { notiftext.settext(r.string.noevents); notiftext.setvisibility(view.visible); } else { notiftext.setvisibility(view.gone); } } private void refresh() { if (!isadded()) return; genericmanager.getinstance().fetchevents(mcontext, new onfinished() { @override public void onfinished(boolean result) { if (result) { if (isadded() && getactivity() != null) { fetchfromdatabase(); adapter.notifydatasetchanged(); listview.invalidate(); mswiperefreshlayout.setrefreshing(false); } } } }); } @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { view = inflater.inflate(r.layout.ptr_list, container, false); this.inflater = inflater; mswiperefreshlayout = (swiperefreshlayout) view.findviewbyid(r.id.swiperefresh); mswiperefreshlayout.setcolorschemeresources(r.color.md_material_blue_600); listview = (listview) view.findviewbyid(r.id.pull_refresh_list); listview.setonitemclicklistener(monitemclicklistener); listview.setonscrolllistener(new abslistview.onscrolllistener() { @override public void onscrollstatechanged(abslistview view, int scrollstate) { } @override public void onscroll(abslistview view, int firstvisibleitem, int visibleitemcount, int totalitemcount) { boolean enable = false; if (listview != null && listview.getchildcount() > 0) { boolean firstitemvisible = (listview.getfirstvisibleposition() == 0); boolean topoffirstitemvisible = (listview.getchildat(0).gettop() == 0); enable = firstitemvisible && topoffirstitemvisible; } mswiperefreshlayout.setenabled(enable); } }); mswiperefreshlayout.setonrefreshlistener(new swiperefreshlayout.onrefreshlistener() { @override public void onrefresh() { refresh(); } }); progress = (imageview) view.findviewbyid(r.id.progress); progress.setvisibility(view.gone); notiftext = (textview) view.findviewbyid(r.id.notiftext); notiftext.setontouchlistener(new view.ontouchlistener() { @override public boolean ontouch(view v, motionevent event) { int action = event.getactionmasked(); float x = event.getx(); float y = event.gety(); switch (action) { case motionevent.action_down: break; case motionevent.action_move: float dx = x - mpreviousx; float dy = y - mpreviousy; if (dy > 300) { mswiperefreshlayout.post(new runnable() { @override public void run() { mswiperefreshlayout.setrefreshing(true); dorefresh(fromrest); } }); } break; case motionevent.action_up: break; } mpreviousx = x; mpreviousy = y; return true; } }); settopbartitle(); return view; } @override public void onactivitycreated(bundle savedinstancestate) { super.onactivitycreated(savedinstancestate); dorefresh(true); } @override public void settopbartitle() { topbar = (topbar) getactivity().findviewbyid(r.id.topbar); topbartitle = r.string.events; ((myactivity) getactivity()).settabbarvisibility(false); topbar.setvisibility(view.visible); super.settopbartitle(); } @override public void onresume() { dorefresh(false); super.onresume(); } /* adapter list think not affect */
and in myfragment have override ondettach:
@override public void ondetach() { super.ondetach(); try { field childfragmentmanager = fragment.class.getdeclaredfield("mchildfragmentmanager"); childfragmentmanager.setaccessible(true); childfragmentmanager.set(this, null); } catch (nosuchfieldexception e) { throw new runtimeexception(e); } catch (illegalaccessexception e) { throw new runtimeexception(e); } } layout of fragment b:
<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.swiperefreshlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/swiperefresh" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".myactivity"> <relativelayout style="@style/viewstyle"> <com.myapp.viewcomp.topbar android:id="@+id/topbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:visibility="gone" /> <imageview android:id="@+id/progress" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerinparent="true" android:src="@drawable/progress" /> <listview android:id="@+id/pull_refresh_list" style="@style/ptr_style" android:background="@color/white" android:divider="@color/white" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_below="@id/topbar" /> <textview android:id="@+id/notiftext" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_below="@id/progress" android:layout_centerinparent="true" android:gravity="center" android:paddingleft="20dp" android:paddingright="20dp" android:visibility="gone" /> </relativelayout> </android.support.v4.widget.swiperefreshlayout> i dont know why the fragment b went ondetach still freezed on screen, can see little bit of fragment @ bottom. suggestion really appreciated, stucked @ thing few days :(
i think problem in implementation of b fragment cant figure out, not sure problem swiperefreshlayout or not ...
i solved problem myself with
mswiperefreshlayout.destroydrawingcache();
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