java - Changing visibility on button in custom adapter -


i have problem listview , custom adapters. im trying put visibility of button gone when click on it, create new element list edit , change.

but doesn't work. think because notifyondatachange puts buttons visibility visible again.

public class customadapteringredientsuser extends arrayadapter<recipe.ingredients.ingredient>  list<recipe.ingredients.ingredient> ingredientlist; context context; edittext textquantity; edittext textname; button xbutton; button plusbutton; public customadapteringredientsuser(context context, list<recipe.ingredients.ingredient> resource) {     super(context,r.layout.ingredient_new_recipe,resource);     this.context = context;     this.ingredientlist = resource; }  @nonnull @override public view getview(final int position, @nullable view convertview, @nonnull viewgroup parent) {      layoutinflater layoutinflater = layoutinflater.from(getcontext());     final view customview = layoutinflater.inflate(r.layout.ingredient_new_recipe,parent,false);     textquantity = (edittext) customview.findviewbyid(r.id.quantitytext);     textname = (edittext) customview.findviewbyid(r.id.ingredientname);      plusbutton= (button) customview.findviewbyid(r.id.newingredientbutton);     xbutton = (button) customview.findviewbyid(r.id.xbutton);     xbutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             ingredientlist.remove(position);             notifydatasetchanged();          }     });     plusbutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             plusbutton.setvisibility(customview.gone);              string name = textname.gettext().tostring();             string qnt = textquantity.gettext().tostring();             recipe.ingredients.ingredient ing2 = new recipe.ingredients.ingredient("quantity","name","photo");             ingredientlist.add(ing2);              notifydatasetchanged();          }     });      return customview; }

image of app

it should let add new elements list, , remove button add more elemenets, in first 1 (the plus button). let user make list of ingredients.

you correct; calling notifydatasetchanged() going make button re-appear. why?

when call notifydatasetchanged(), listview redraw itself, going adapter information needs. involves calling getview() currently-visible items in list.

your implementation of getview() inflates , returns customview. since you're returning newly-inflated view, attributes of views not manually set after inflation set values in layout xml (or defaults, if not set here).

the default value visibility visible, when inflate customview, plusbutton visible unless manually change gone.

you have store sort of indication whether button @ given position should visible or gone, , apply inside getview() after inflate customview.

ps: in general, bad idea inflate new view every time getview() called. should leverage convertview argument , "view holder" pattern. improve performance of app. searching google , site should give ideas this.


Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more