Android Question Get text height of RichString

edgeryder1000 · Jul 30, 2013

I have a label which displays a RichString using agraham's library. StrUtil.MeasureMultilineTextHeight is not giving the correct height. Is there a solution using reflection or some other method?

thedesolatesoul · Jul 30, 2013

Can you post some code/screenshot? Are you using a different font?
I use RichString + SU to get the correct text height.

edgeryder1000 · Jul 31, 2013

B4X:

        rs.Initialize(File.ReadString(File.DirAssets, CurrentBook & i    & ".txt")) 
        rs = rsf.Format(rs)

        Label1.Text = rs
 
        Panel1.AddView(Text, 20dip, 10dip, 100%x - 40dip, 10000)
        ScrollView1.Panel.Height = SU.MeasureMultilineTextHeight(Text, rs) + 20dip
        Text.RemoveView
        ScrollView1.Panel.AddView(Text, 20dip, 10dip, 100%x - 40dip, Panel1.Panel.Height)

If I remove rs = rsf.Format(rs) then it gives the correct height

Erel · Jul 31, 2013

MeasureMultilineTextHeight treats the text as a standard text without formatting.

You will need to multiply the height with a factor.

edgeryder1000 · Jul 31, 2013

Darn. So there is no easy way to do this, even in java?

Erel · Jul 31, 2013

It might be possible to accomplish this with a library. However with reflection it will be too complicated.

edgeryder1000 · Jul 31, 2013

Ok, thanks Erel

AscySoft · Mar 10, 2015

Erel said:
It might be possible to accomplish this with a library. However with reflection it will be too complicated.

After so long, is it possible to get a lable heigh who is RichString formatted?

Erel · Mar 11, 2015

Try this inline Java code:

B4X:

#if JAVA

import android.text.StaticLayout;
import android.text.Layout.Alignment;
import android.widget.TextView;
public int MeasureMultilineTextHeight(TextView Label) {
    StaticLayout sl = new StaticLayout(Label.getText(), Label.getPaint(),
          Label.getLayoutParams().width - Label.getPaddingLeft() - Label.getPaddingRight(),
    Alignment.ALIGN_NORMAL, 1, 0 , true);
    return sl.getLineTop(sl.getLineCount());
    }
#end if

AscySoft · Mar 12, 2015

Erel said:

Try this inline Java code:

B4X:

#if JAVA

import android.text.StaticLayout;
import android.text.Layout.Alignment;
import android.widget.TextView;
public int MeasureMultilineTextHeight(TextView Label) {
    StaticLayout sl = new StaticLayout(Label.getText(), Label.getPaint(),
          Label.getLayoutParams().width - Label.getPaddingLeft() - Label.getPaddingRight(),
    Alignment.ALIGN_NORMAL, 1, 0 , true);
    return sl.getLineTop(sl.getLineCount());
    }
#end if

Yes, it does seems to propperly work.
I tested it on my 4.2.2 device it does calculate a heigher value than stringutils method.
I further need to test it on 2.3 devices for propper feedback.
May I suggest you one thing?
Why don't you update the stringutils method with above code?
Second: If i place this code inside a module how shoud I make a call from an activity (I don't know if this is possible)?

Forgot: a big thanks 2 you Erel!

Erel · Mar 12, 2015

See the example here about the static code module: https://www.b4x.com/android/forum/threads/inline-java-code.50141/#content

AscySoft · Mar 13, 2015

That simple? In my case i needed to change the

B4X:

public int MeasureMultilineTextHeight(TextView Label) {

with

B4X:

 public static int MeasureMultilineTextHeight(TextView Label) {

and then create propper call with array parameter. I'm new to java I know

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