Android Question Listview label height

LucaMs

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• Mar 31, 2014

• #2

I tried this code:

B4X:

Dim cnv As Canvas
Dim lbl As Label = ListView1.TwoLinesLayout.SecondLabel
cnv.Initialize(lbl)
Dim CanvasStringHeight As Float
CanvasStringHeight = cnv.MeasureStringHeight(Note, lbl.Typeface, lbl.TextSize)
Log("CanvasStringHeight = " & CanvasStringHeight)

but I get this error:
java.lang.IllegalArgumentException: width and height must be > 0
at android.graphics.Bitmap.createBitmap(Bitmap.java:603)
...

for the statement: cnv.Initialize(lbl)

 

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DonManfred

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• Mar 31, 2014

• #3

Klaus already did it, or not?

 

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eps

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• Mar 31, 2014

• #4

Did you add this in code or the Designer?

You will need to set the height of the ListView, which you don't seem to have done in the code you've posted.

 

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LucaMs

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• Mar 31, 2014

• #5

Yes, I set the heightS in the code.

I think I get the error because I should refer to a specific item, but there is not a function to get it:
ListView.GetItem returns text (though there is RemoveAt, damn )

Manfred, that routine does the opposite, fits the text height of the label, unfortunately

 

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eps

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• Mar 31, 2014

• #6

ListView<X>.TwoLinesLayout.Label.Height is what you need to set

 

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DonManfred

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• Mar 31, 2014

• #7

btw: luca, you only can set ONE height for Label and one height for SecondLabel in Listview.
Every item in the listview will have the same height (ListView<X>.TwoLinesLayout.Label.Height+ListView<X>.TwoLinesLayout.SecondLabel.Height)
You cannot set an different heigth for every listview-item

and this will be adapted to fontsize, color and so on too. Every item will look the same. It´s like "Little boxes"

 

Last edited: Mar 31, 2014

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LucaMs

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• Mar 31, 2014

• #8

damn... and canvas MeasureStringHeight also don't calculates the text height as i need.

Thanks for you help.

 

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eps

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• Mar 31, 2014

• #9

DonManfred said:

btw: luca, you only can set ONE height for Label and one height for SecondLabel in Listview.
Every item in the listview will have the same height (ListView<X>.TwoLinesLayout.Label.Height+ListView<X>.TwoLinesLayout.SecondLabel.Height)
You cannot set an different heigth for every listview-item

and this we be adapted to fontsize, color and so on too. Every item will look the same.

Click to expand...

Mostly yes you can only set the items once... however you can set two different sizes, but it is a bit of a fiddle.

Use TwoLinesLayout and TwoLinesAndBitmap - the two can be different, for the same ListView.

 

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LucaMs

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• Mar 31, 2014

• #10

So, i should use a scrollview, since I can not have different heights for the items in the listview (I had forgotten this).

But how to calculate the height of a label depending on the text in it? (I have the impression that I have read the answer in the site, months ago)

 

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eps

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• Mar 31, 2014

• #11

ScrollView is the way to go for lots of items which are different heights. or customlistview or tableview or ULV (chargeable from Informatix).

 

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LucaMs

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• Mar 31, 2014

• #12

In conclusion:

I'll have to use a ScrollView and include the StringUtils library with its MeasureMultilineTextHeight function.

The first post is still valid

Thanks again.

 

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DonManfred

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• Mar 31, 2014

• #13

eps said:

Use TwoLinesLayout and TwoLinesAndBitmap - the two can be different, for the same ListView.

Click to expand...

It will work on singlelinelayout and twolinelayout too... I use this to make categories in listview.

 

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klaus

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• Mar 31, 2014

• #14

You cannot set the canvas to ListView1.TwoLinesLayout.SecondLabel because its Width = -1 by default to fit the parent view.

You could define:

B4X:

Dim bmp as Bitmap
bmp.InitializeMutable(2, 2)
cnv.Initialize(bmp)

Using a small bitmap for the canvas to minimize memory consumption.

In CustomListView you have AddTextItem which adjusts the height automatically.

 

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LucaMs

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• Mar 31, 2014

• #15

Thanks, Klaus.

(I'm sure you'll create the snippet )

 

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