android - What should I do to make the listview work in the fragment when I am getting data from the user and saving it into a SQLite database -


this shows 1 of fragments has listview code in worked in it's own layout not work in fragment. should work in fragment? new android app development not know do. if not understand trying do, having user enter data form , want data displayed in fragment list can see data entered beginning end. have been looking on solution cannot find 1 fits need do. information see pre-saved sq lite databases. 

import android.content.intent; import android.os.bundle; import android.support.annotation.nullable; import android.support.v4.app.listfragment; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.database.cursor; import android.util.log; import android.widget.adapterview; import android.widget.arrayadapter; import android.widget.listadapter; import android.widget.listview; import android.support.v4.app.fragment; import android.support.v4.app.fragmentmanager; import android.support.v4.app.fragmentpageradapter; import android.widget.toast;  import java.util.arraylist;  import static android.r.attr.button;  public class tab3expense extends fragment {      private static final string tag = "tab3expense";     databasehelper mdatabasehelper;     private listview mlistview;       @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         view rootview = inflater.inflate(r.layout.tab3expense, container, false);         return rootview;          mlistview = (listview) findviewbyid(r.id.listview);         mdatabasehelper = new databasehelper(this);          populatelistview();      }      private void populatelistview() {         log.d(tag, "populatelistview: displaying data in listview.");          //get data , append list         cursor data = mdatabasehelper.getdata();         arraylist<string> listdata = new arraylist<>();         while(data.movetonext()){             //get value database in column 1             //then add arraylist             listdata.add(data.getstring(1));             listdata.add(data.getstring(2));             listdata.add(data.getstring(3));         }         //create list adapter , set adapter         listadapter adapter = new arrayadapter<>(this, android.r.layout.simple_list_item_1, listdata);         mlistview.setadapter(adapter);          //set onitemclicklistener listview         mlistview.setonitemclicklistener(new adapterview.onitemclicklistener() {             @override             public void onitemclick(adapterview<?> adapterview, view view, int i, long l) {                 string name = adapterview.getitematposition(i).tostring();                 log.d(tag, "onitemclick: clicked on " + name);                  cursor data = mdatabasehelper.getitemid(name); //get id associated name                 int itemid = -1;                 while(data.movetonext()){                     itemid = data.getint(0);                 }                 if(itemid > -1){                     log.d(tag, "onitemclick: id is: " + itemid);                     intent editscreenintent = new intent(tab3expense.this, add_expense.class);                     editscreenintent.putextra("id",itemid);                     editscreenintent.putextra("name",name);                     startactivity(editscreenintent);                 }                 else{                     toastmessage("no id associated name");                 }             }         });     }      /**      * customizable toast      * @param message      */     private void toastmessage(string message){         toast.maketext(this,message, toast.length_short).show();     } }

here layout file

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingbottom="@dimen/activity_vertical_margin" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" tools:context="com.dharquissandas.budget.mainactivity$placeholderfragment">  <listview     android:layout_width="match_parent"     android:layout_height="match_parent"     android:id="@+id/listview"/> </linearlayout>

rearrange code

     @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         view rootview = inflater.inflate(r.layout.tab3expense, container, false);           mlistview = (listview)rootview. findviewbyid(r.id.listview);         mdatabasehelper = new databasehelper(getcontext());          populatelistview();  return rootview;      }

Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer ...
Read more

c# - Asp.net web api : redirect unauthorized requst to forbidden page -

im trying redirect unauthorized request forbidden page instead i'm getting forbidden page in response body , how can fix ? here's startup class : app.createperowincontext(storecontext.create); app.createperowincontext<applicationusermanager>(applicationusermanager.create); app.createperowincontext<applicationsigninmanager>(applicationsigninmanager.create); app.usecookieauthentication(new cookieauthenticationoptions { authenticationtype = defaultauthenticationtypes.applicationcookie, expiretimespan = timespan.fromdays(30), }); app.useexternalsignincookie(defaultauthenticationtypes.externalcookie); app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5)); app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie); the method im trying reach : [httpget] [authorize(roles = "admin")] public string getcurrentusername() { return userman...
Read more