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Questions tagged [convertview]

ConvertView represents one of the parameters of the `getView` method of various Android adapters, often used to improve the performance of that adapter.

The convertView is a parameter in the getView method of all Android adapters. This convertView represents a recycled row view(if it is not null) which should always be used in the getView method to avoid the costly creation of objects every time the adapter is required to supply a row view from its getView method. A typical use pattern of the convertView in the getView method is:

  • check if the convertView is null.
  • if the convertView is null then the getView method must build the entire row view as there is no recycled view available.
  • if the convertView is not null then the getView method is supplying a recycled view on which the only needed actions are to setup the correct data/information.

More information about the convertView importance and use can be found in the Google I/O video about Android performance.

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how to keep the background color of an item when you scroll a listview

Clicking on an item, change background color and text of this. But scrolling color and text is lost, leaving it as it was. How could I solve it? Please help me, i am a beginner. this is my getview: public View getView(int position, View convertView,…
Endika Llonin
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Convert View always return null instead of recycling

I have 3 fragments with me, which is "Home", "Shop", and "Collection". After I executed the DownloadTask in Collection fragment, the progress bar and textviews are updating. But once I selected the Home tab(1st tab) and select back the Collection…
Tan Yong Foo
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multiple xml views with convertView android

I am trying to write a ListView adapter that will pass a view based on one of several xml files depending on an attribute of the data that I am creating a View for. My code works fine, except when I try to use convertView to speed up the process. …
Thomas Hodges
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How to increment and decrement textview value using two buttons in each row of custom listview in android

Here is my code, but when I run it, the output is same to all rows of listview that I don't want. I want independent output for all rows..... @Override public View getView(int position, View convertView, ViewGroup parent) { final…
Amol Pawar
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Messing images on ListView (even with viewHolder)

As effective using of a BaseAdapter, I use a ViewHolder to hold the items for recycling. Normally I load images with the ImageLoader library, and it's OK. This time I'm loading images from ByteArray, but when I load them and I scroll the ListView, I…
Rafael Ruiz Muñoz
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Wrong 'convertView' object while scrolling a list view

My problem is that when I'm scrolling a list view I'm getting wrong convertView, but the position is right. I have 3 items in my Listview, on load 'position' parameter is called with index '0' and convertView is null. When I scroll one by one, to…
EitanG
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ConvertView items partially updated

I have custom ListView in my activity and it uses ConvertView pattern and ViewHolder. Everything works fine, but sometimes text in items are cuted off. This is clearly seen on screenshots: It looks like it reuse old view and don't update text…
Koval Alexander
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Add view created dynamically to convertview in expandable listview android

This is my first question, I need to add dynamically textViews to convertView that is returned in getChildView() method expandable, but I can not do in any way.. @Override public View getChildView(int groupPosition, int childPosition, boolean…
user3093282
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Can't get parent position from convert view

I have a listView that currently displays the names of images along with a thumb of the image beside it. I highlight the selected textBox green onClick, but while scrolling through the list other items are highlighted as well. ADAPTER: public class…
Soulfly
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listview asyncimage mismatch

i used the Android-Universal-Image-Loader(https://github.com/nostra13/Android-Universal-Image-Loader) for my project,but i get a strange problem: the image loaded from the website was dismatch with the listview item when i scroll fast or fling…
user2996525
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In android List Adapter, what if the convertView is null and not null ?Can anyone please explain for the below getView method

What is the all about if(converView==null) { } else { } What if i avoid writing else part and how it effects my code ? I just wanted to know if it works fine without else part . Could someone explain about the gettag and settag for convertview??? …
user2680801
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ListView items repeated issue

I have a multicolumn_listview. Some rows repeat in listview. i looked at all solution about this problem. listview items image Listview height not wrap_content My holder class static I created all views in if(convertView==null) block in…
babeyh
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convertview in getgroupview is not working properly

I am making an app that uses listview and listadapters. It worked fine but I found a memoryleak in the getgroupview-method. Before I inflated an xml-file everytime and that caused a leak. groupRow = inflater.inflate(R.layout.activity_phrase,…
Björn Hallström
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NullPointerException while working with convertView and custom data listView

I am working with custom data listViews and a convertView to create a basic listView which can be populated with custom data, I keepe getting a null Pointer exception at a block of code near the bottom which has "holder.text1.setText(X);" etc. I…
September
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Understanding convertView parameter of GetView method

Hello android developers, I have read documentation on getView method of BaseAdapter and what I understood is view can be reused/recycled,so should check that this view is non-null and of an appropriate type before using. In my case every time…
Dory
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