B4A Library [Class] CheckList

Hi,

I created a class to manage a list with checkboxes (but not only, you can use it for any kind of list with rows). The layout is highly customizable and you can even extend a clicked item with extra content. You can rearrange the items programmatically or manually (drag & drop).

Tutorials: How they do #1, How they do #3

img1.jpg img2.jpg img3.jpg img4.jpg img5.jpg

v1.1: I added the ExtendItem function and an option to check the box when items are added

v1.2: I fixed the width problem (in a container like TabHost, the width property returns -1, so we have to use a different method to get the SV width) and, in the demo, a click on the extended item collapses now its content.

v1.3: I added a new function to add items without checkbox (AddItemNoChkbx) so you can use this class as a ListView replacement;
I changed the way it colors the selected item (now it complies to the default Android theme);
I added an option to color differently the extended item.

v1.4: I optimized the code a little bit and I added three functions:
AddCustomItem (adds your own layout to the list);
AdjustBitmap (resizes the bitmap to fit the given dimensions);
GetFirstText (returns the first label text found for the given ID).

v1.5: I simplified and improved the management of extended items (I also fixed a bug). Unfortunately, that could break existing code.
Inspired by the class CustomListView, I added a parameter to Initialize: DividerHeight (if you want to put a colored divider between items) and several functions:
- NumberOfItems
- getHeight
- JumpToPosition
- JumpToItem
- CollapseItem
- HasExtraContent
- ExtendedItemID

v1.6:
Now, you can define the color of checked items and the background color (transparent by default).
I added two (very fast) functions:
- JumpToView (scrolls the list to the given view)
- FindPanelContaining (returns the panel containing the given view)
I added another example.

v2.0:
I added more than 10 new functions (MoveItem, RemoveItemAt, SwapItems, SortItems, ReplaceItem, ApplyColors, CreateTextList, etc.). See post #21 for complete list;
I changed the ID type (formerly Int) to Object (that shouldn't break the existing code);
I added the Drag & Drop feature;
I optimized JumpToPosition (a lot quicker now);
I fixed a bug with colors.

v2.1:
I added functions to filter the list;
I added CreateIntegerList to ease the sorting and filtering of integer values;
Now you can change the item height in ReplaceItem.

v2.2:
I fixed a bug (BackgroundColor was not applied to new items)
I added new functions:
- FindPanelWithID(ID As Object) As Object
- SetOnPaintListener(SubName As String)
- Repaint(pnlItem As Panel)
I renamed ApplyColors to RepaintAllItems

v2.21:
I changed an incorrect declaration in the demo #1 and #2.
The class is now compatible with the obfuscation option.

v2.22:
The class no longer displays warnings with B4A v2.7x.
All examples are now compatible with the obfuscation option.

Complete list of functions here

Fred

PS: you need the Reflection Lib
 

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  • CheckList v2.22.zip
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Informatix

Informatix

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hookshy said:
Any idea how to change the orange color that is describing the press action of items ?
Hope I made myself understood !

I did played with colors found as process variables with no luck.
Thank you
Click to expand...
This is not a color in fact but a drawable. By default, the class gets the default drawable for pressed items of your device. You can change that in the class. Search PressedDrawable.
 
marcel

marcel

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Hi,

Would it be possible to have a tree layout? I have items and SubItems I would like to Check. Would this be possible? An Example would be create!
 
marcel

marcel

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Hi,

I have some issues with the class. I need to remove all the items which I do with the following function:

B4X: 
Public Sub RemoveAllItems
    Do While NumberOfItems > 0
        RemoveItemAt(0)
    Loop
End Sub

But when I build up the list again I get an error in this function:
B4X: 
Private Sub GetParentPanel(MyView As View) As View
    Dim r As Reflector
    Dim v, Parent As View
    r.Target = MyView
    v = r.Target
    Parent = r.RunMethod("getParent")
    Do While Parent <> sv.Panel
        r.Target = Parent
        v = r.Target
        Parent = r.RunMethod("getParent")
    Loop
    Return v
End Sub

this is the exception log:
B4X: 
Did you forget to call Activity.LoadLayout?
    at anywheresoftware.b4a.AbsObjectWrapper.getObject(AbsObjectWrapper.java:49)
    at com.yazula.android.clschecklist._getparentpanel(clschecklist.java:1937)
    at com.yazula.android.clschecklist._findpanelcontaining(clschecklist.java:102)
    at com.yazula.android.clscategory._customchbx_checkedchange(clscategory.java:249)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:302)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
    at anywheresoftware.b4a.objects.CompoundButtonWrapper$1.onCheckedChanged(CompoundButtonWrapper.java:44)
    at android.widget.CompoundButton.setChecked(CompoundButton.java:137)
    at anywheresoftware.b4a.objects.CompoundButtonWrapper.setChecked(CompoundButtonWrapper.java:55)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:305)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
    at anywheresoftware.b4a.BA$2.run(BA.java:285)
    at android.os.Handler.handleCallback(Handler.java:615)
    at android.os.Handler.dispatchMessage(Handler.java:92)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:4921)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
    at dalvik.system.NativeStart.main(Native Method)

Some how it removes a view that is not initialized again with building op the list again. This is my function that refreshes the layout:

B4X: 
Public Sub RefreshLayout
 
  lst.RemoveAllItems
 
  Dim l As List
  l=Helpers.SelectCategories(Main.db)

  For Each item As Category In l
          Dim pnl As Panel, lbl As Label, cbx As CheckBox, tBtn As ToggleButton, w As Int
        pnl.Initialize("")
        lbl.Initialize("")
        cbx.Initialize("customChBx")
        cbx.Tag=item.id
        cbx.checked=item.Selected
        lbl.Text = item.Name
        lbl.TextSize = 13
        lbl.TextColor = Colors.DarkGray
        lbl.Gravity = Gravity.CENTER_VERTICAL
       
        Dim checked, unchecked As ColorDrawable
       
        checked.Initialize(Colors.LightGray,0dip)
        unchecked.Initialize(Colors.LightGray, 0dip)
       
        tBtn.Initialize("customTBtn")
        tBtn.TextOff="Overal"
        tBtn.TextOn="Favorite"
        tBtn.TextColor=Colors.RGB(236,106,30)
        tBtn.Tag=item.id
        tBtn.checked = item.Local
       
        Dim sld As StateListDrawable
        sld.Initialize
        sld.AddState(sld.State_Checked, checked)
        sld.AddState(sld.State_Unchecked, unchecked)

        tBtn.Background = sld

        pnl.AddView(cbx,0,0,40dip,40dip)
        w = lst.getWidth - 90dip
        pnl.AddView(lbl,45dip, 0, w, 40dip)   
        w = w + 10dip
        pnl.AddView(tBtn, w, 0, 80dip, 38dip)
        lst.AddCustomItem(item.id, pnl, 40dip)
  Next
  lst.ResizePanel
End Sub
 
Last edited:
PABLO2013

PABLO2013

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GREETINGS THANK YOU,
I have the following problem:

Sub CreateItem(h, i As Int) As Panel
.......

Dim pnl As Panel, lbl As Label, chk As CheckBox, edt As EditText, sb As StartPointSeekBar
pnl.Initialize("")
..........
sb.Initialize("sb") 'View #1
sb.TheBackgroundColor = Colors.Cyan
sb.TheRangeColor = 0xFF33B5E5
sb.MinValue = -9 'Keep the order of this 3 lines of code
sb.maxValue = 9
sb.ThumbValue = 1
sb.SetColorAnimated(300,2323,343345)
pnl.AddView(sb, 150, 15, 250dip, 50dip)
.....
Return pnl
End Sub

Sub sb_value_changed

Dim Checked As Boolean
Checked=False
Dim pnl As Panel
pnl = lst.FindPanelContaining(Sender) i can not find panel containing
...........

End Sub


One error occurs in the module: CheckList v2.22
could you tell me this because doing wrong
Thank you
 

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Informatix

Informatix

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PABLO2013 said:
GREETINGS THANK YOU,
I have the following problem:

Sub CreateItem(h, i As Int) As Panel
.......

Dim pnl As Panel, lbl As Label, chk As CheckBox, edt As EditText, sb As StartPointSeekBar
pnl.Initialize("")
..........
sb.Initialize("sb") 'View #1
sb.TheBackgroundColor = Colors.Cyan
sb.TheRangeColor = 0xFF33B5E5
sb.MinValue = -9 'Keep the order of this 3 lines of code
sb.maxValue = 9
sb.ThumbValue = 1
sb.SetColorAnimated(300,2323,343345)
pnl.AddView(sb, 150, 15, 250dip, 50dip)
.....
Return pnl
End Sub

Sub sb_value_changed

Dim Checked As Boolean
Checked=False
Dim pnl As Panel
pnl = lst.FindPanelContaining(Sender) i can not find panel containing
...........

End Sub


One error occurs in the module: CheckList v2.22
could you tell me this because doing wrong
Thank you
Click to expand...
A view is expected by the function but the sender object is not. Please see this problem with the library author because I have no idea of what is a "StartPointSeekBar".
 
Dave O

Dave O

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I'm using a checklist with a long click to activate drag and drop.

However, each item (panel) contains several labels, and if the user happens to press the label, the drag-and-drop is not started (presumably because the label itself is getting the long click, not the panel beneath it).

Ideally I would like the entire item to accept a long click to drag-and-drop. Is there a way to "pass through" the long click from the label to the panel? (I tried setting up a long-click event for the label, and using it to trigger the drag-and-drop (by calling the item's StartDragAndDrop sub, or by calling the item's LongClick sub itself), but neither worked.)

I could also just replace the Checklist class with a ULV, but I'm wondering if I'll still have the same issue? (In the end, I may just switch to ULV and use an on-touch button for drag-and-drop instead.)

Thanks!
 
Dave O

Dave O

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Yes, that was the problem. I had added click events to the labels, and that interfered with the long click. Fixed and working well again. Thanks!
 
PABLO2013

PABLO2013

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Greetings,
I've been reviewing your project and I feel very good ,
I only know how i can change the characteristics of a label view that does not necessarily have the focus.
Example: if I put a number between 1 and 9 in a text view ( example (5) ) and have 9 items (with more views), put the blue the text on a label to the item 5 ... , thanks
 
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