CustomListView - A flexible list based on ScrollView

[Erel]

You can change this line in the class to change the background (Initialize sub):

sv.Color = 0xFFD9D7DE 'this sets the dividers color

However this will also affect the divider color.

 

[somed3v3loper]

I am sorry if this question has been answered but does customlistview recycle its elements?
Is it better in handling lots of items than scrollview?
My project has lots of bitmaps.

 

[Erel]

No. The items are not recycled. This is why it is good for lists of up to 1000 or 2000 items. Informatix UlitmateListView does recycle items (TableView also recycles items however it doesn't support images).

 

[JForge]

In my quest to perfect this customlistview I have another question.

Can I make the divider colors different for different activities?

 

[Erel]

Yes. You can add a public method to the class that changes the color.

 

[JForge]

THANKS EREL!

You and this entire community are the absolute best. I am beyond thankful.

 

[joneden]

Hi Erel,

I'm using a modified version of this as an autoscrolling list. The issue that I have is that the scrollbar appears on the right and I'd prefer to hide it. Is there a way to use the sv.ScrollPosition without showing the scroll bar?

Regards

Jon

 

[klaus]

Use this code with the Reflection library:

Dim r As Reflector
r.Target = ScrollView1
r.RunMethod2("setVerticalScrollBarEnabled", False, "java.lang.boolean")

Best regards.

 

[joneden]

Perfect many thanks Klaus!

Best Regards

Jon

 

[socialnetis]

I have a couple of sections in an app that make use of this listview.
Each sections loads between 20 to 100 bitmaps into the customListView, and I can see an overload of 5-10mb of ram, which I find acceptable.

The problem is that if I go back and forward between these sections, the ram used always increase about 5-10mb each time I enter a section but never goes down. So if I enter the same section 10 times I get about 100mb of ram, and eventually the app crashes with an Out of Memory error.

What is the correct way to avoid this? Maybe saving the panels in a Global variable as List, or this is bad practice?

 

[Erel]

Can you upload your project in a new thread?

 

[socialnetis]

Hi Erel, the project is really big and have several "secret" keys to upload.
However, I started recycling the bitmaps in the Activity_Pause and it seems to be working (it recovers about 70-80% of the mb used).

 

[Erel]

Another option is to load the bitmaps once and store them in a process_global collection.

 

[Florin]

The native ListView is a optimized for very large lists. Instead of creating the views for each item, it reuses the same views when possible. This optimization makes it very difficult to customize the items.

CustomListView is an implementation of a list based on ScrollView.

CustomListView is suited for lists of up to 1000 or 2000 items.

Advantages of CustomListView:

• Each item is made of a Panel that can hold any views.
• Items can be modified at any time.
• It is possible to insert or remove items from any position.
• Each item can have a different height.
• Items height can be set automatically based on the text (using AddTextItem).

Using CustomListView is simple:
- First you should initialize the list and add it to a panel or activity.
- Then you should add items.
Each item is made of a panel that holds other views.
AddTextItem is a convenient utility to add items made of a single label.

The attached example creates two lists:

The first list is made of simple text items.

In the second list each item is made of a label, button and checkbox.
All the buttons are handled by Sub Button_Click.
The clicked item is found by calling:

index = clv2.GetItemFromView(Sender)

This class depends on the Reflection and StringUtils libraries.

V1.10 - Adds designer support. CustomListView can now be added with the visual designer. Add a CustomView and then set its CustomType property to CustomListView.

 

[Florin]

"V1.10 - Adds designer support. CustomListView can now be added with the visual designer. Add a CustomView and then set its CustomType property to CustomListView."

Added CustomView to Designer, Custom Type is not available with CustomListView option.
???

 

[Erel]

Can you upload your project (File - Export as zip)?

 

[Florin]

Can you upload your project (File - Export as zip)?

Nope, because : "An error occurred. Object reference not set to an instance of an object" ... ? even if the project runs in AVD and real dev.

 

[Erel]

Can you manually zip it and upload it?

 

[Florin]

Can you manually zip it and upload it?

Where can I find a decent description of CustomListView, such as the ones in basic4ppc.com/android/help ... ? All I could find are posts and examples, not even a link to download the class, had to get it from the CustomListView example ...

UPDATE: Never mind, gave it up.

 

[GMan]

Here you can found what you need:
http://www.b4x.com/android/forum/th...w-with-pull-to-refresh-feature.27810/#content