Android Tutorial ListView tutorial

[Paulux]

Thanks for your quick reply

Best Regards

 

[eps]

You cannot change the color of the selected item.
If you want it you should use a ScrollView.
There are many ScrollView examples.

Best regards.

Whilst this is true, what you can do, is have 2 ListViews (unless you want to go down the ScrollView route) and then flip between the two, making it appear as if its' changing colour

 

[Roger Garstang]

You can also use images...either as an image or just as a colored tab effect to have certain items a different color. You can change the size of the internal image view and move the labels left too if just using something like a colored line as some email apps use to show different email accounts.

 

[kikloo]

Hi,

How to empty the Listview ?

Thanks.

 

[Erel]

ListView.Clear

 

[kikloo]

ListView.Clear

Hi Erel,

Thanks. It works great.

Thanks.

 

[askez]

diraction

how can i change the scroll view direction to be RTL
i want image to appear right to the text not left
thanx

 

[klaus]

You need to adjust the properties of the internal views, the two Labels and the ImageView.
Attached a small test program.

Sub Globals
    Dim ListView1 As ListView
    Dim bmp As Bitmap
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Dim i As Int
    
    bmp.Initialize(File.DirAssets, "Rose.png")
    
    ListView1.Initialize("ListView1")
    Activity.AddView(ListView1, 0, 0, 100%x, 100%y)
    
    ListView1.TwoLinesAndBitmap.ItemHeight = 70dip
    ListView1.TwoLinesAndBitmap.Label.Left = 0
    ListView1.TwoLinesAndBitmap.Label.Top = 0
    ListView1.TwoLinesAndBitmap.Label.Width = ListView1.Width - 70dip
    ListView1.TwoLinesAndBitmap.Label.Height = 40dip
    ListView1.TwoLinesAndBitmap.Label.Gravity = Gravity.CENTER_VERTICAL
    ListView1.TwoLinesAndBitmap.Label.TextSize = 20
    
    ListView1.TwoLinesAndBitmap.SecondLabel.Left = 0
    ListView1.TwoLinesAndBitmap.SecondLabel.Top = 40dip
    ListView1.TwoLinesAndBitmap.SecondLabel.Width = ListView1.Width - 70dip
    ListView1.TwoLinesAndBitmap.SecondLabel.Height = 30dip
    ListView1.TwoLinesAndBitmap.SecondLabel.Gravity = Gravity.CENTER_VERTICAL
    ListView1.TwoLinesAndBitmap.SecondLabel.TextSize = 16
    
    ListView1.TwoLinesAndBitmap.ImageView.Left = ListView1.TwoLinesAndBitmap.Label.Width + 5dip
    ListView1.TwoLinesAndBitmap.ImageView.Top = 5dip
    ListView1.TwoLinesAndBitmap.ImageView.Width = 60dip
    ListView1.TwoLinesAndBitmap.ImageView.Height = 60dip
    ListView1.TwoLinesAndBitmap.ImageView.Gravity = Gravity.FILL
    
    For i = 0 To 20
        ListView1.AddTwoLinesAndBitmap("Line 1" & i, "Line 2" & i, bmp)
    Next
End Sub

Best regards.

 

[askez]

background color

works great!

can i change the background color between 2 line?
1 - white
2- blue
3- white
4- blue
....
thanx!

 

[klaus]

It depends on what you mean with line1 and line2.
You can chage the color of the two lines in an item but you cannot change the colors of different items. This can be done with a ScrollView.

Best regards.

 

[askez]

i've implemented this code and it looks great.
i want picture to come from my DB and not a file.
i've read the tutorials and examples (like flickerview) but i cant manage to combine them with this code.
does anyone has any hint?
thanx!

 

[klaus]

You should read your bitmaps from your database and add them to the ListView. You must dim a new bitmap for each different image. Be careful if you have many big images.

Best regards.

 

[aaronk]

Hello,

I am using the ListView like below, but lets say I want to change the text for item #4 to something else but want the rest to remain the same.

Do I have to clear the list and re add all the items again or is there a way to only edit 1 item?

 

[Erel]

You can use CustomListView class instead of ListView: [Class] CustomListView - A flexible list based on ScrollView

It will allow you to add an item from the middle and insert a new one.

 

[Informatix]

You can also use the CheckList class. But if I read you well, your problem is not to insert a new item but to replace an existing content. With CustomListView or CheckList, the code is the same (sv = your scrollview):

Dim pnl as panel
pnl = sv.Panel.GetView(3) 'The first position is 0, so for the fourth item, the position is 3
Dim lbl as label
lbl = pnl.GetView(0) 'I suppose that your label is in first position in the item panel
lbl.Text = ... your new text

If you want to change completely the layout and content of your item, CheckList has a function for it: ReplaceItem.

 

[pixelpop]

On the first page of this thread it is stated:

Tips
If you want a single line item with a bitmap (and do not need two lines and a bitmap), you can set the visible property of the second label to false.

I have tried this and also just passed "" as the second label, but the result is the same--the text for the first label is still pushed to the top of the entry. Any chance an update will provide a "SingleLineAndBitmap" option that will vertically center a single line of text on the bitmap?

 

[Roger Garstang]

I have tried this and also just passed "" as the second label, but the result is the same--the text for the first label is still pushed to the top of the entry. Any chance an update will provide a "SingleLineAndBitmap" option that will vertically center a single line of text on the bitmap?

You can move the 1st label down/centered or make it the full item height and set the Gravity (Of the First Label) how you want it aligned.

 

[klaus]

Sure it works.

Attached a test program showing it !

Sub Globals
    Dim ListView1 As ListView
    Dim bmp As Bitmap
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Dim i As Int
    
    bmp.Initialize(File.DirAssets, "Rose.png")
    
    ListView1.Initialize("ListView1")
    Activity.AddView(ListView1, 0, 0, 100%x, 100%y)
    
    ListView1.TwoLinesAndBitmap.ItemHeight = 70dip
    ListView1.TwoLinesAndBitmap.Label.Left = 0
    ListView1.TwoLinesAndBitmap.Label.Top = 0
    ListView1.TwoLinesAndBitmap.Label.Width = ListView1.Width - 70dip
    ListView1.TwoLinesAndBitmap.Label.Height = 70dip
    ListView1.TwoLinesAndBitmap.Label.Gravity = Gravity.CENTER_VERTICAL
    ListView1.TwoLinesAndBitmap.Label.TextSize = 20
    
    ListView1.TwoLinesAndBitmap.ImageView.Left = ListView1.TwoLinesAndBitmap.Label.Width + 5dip
    ListView1.TwoLinesAndBitmap.ImageView.Top = 5dip
    ListView1.TwoLinesAndBitmap.ImageView.Width = 60dip
    ListView1.TwoLinesAndBitmap.ImageView.Height = 60dip
    ListView1.TwoLinesAndBitmap.ImageView.Gravity = Gravity.FILL
    
    For i = 0 To 20
        ListView1.AddTwoLinesAndBitmap("Line 1" & i, "", bmp)
    Next
End Sub

Best regards.

 

[pixelpop]

WOW! Fast reply and perfect solution. Thanks guys!

 

[Dogbonesix]

Goto Listview Item

I have been looking but can not find a way to go directly a certain row in a listview?

Such as listview1.selected(12) where 12 is the 12th item in the listview?

It is probably a simple way I just have not found it.