textView.getLineCount() is not working as expected

Question

There is a TextView inside ListView.
I set maxLine of TextView through codding like bellow.

view.textView.setText("....... Long String.........");
    view.textView.post(new Runnable() {
       @Override
       public void run() {

        if(view.textView.getLineCount > 4) {
           view.tv_read_more.setVisibility(View.VISIBLE);
           view.textView.setMaxLines(4);
        }
       }
    });

Problem : textView.setMaxLine() not working first time.
textView affected after ListView scroll down and scroll up

have you tried calling textView.setMaxLines(4) before textView.setText()? — Frank D., Aug 26 '15 at 09:33
If my textview have more then 4 line then only I want to set maxLine of textView. — Chirag Savsani, Aug 26 '15 at 09:34
why would you need to count the number of lines if you can limit the number of lines beforehand using setMaxLines()? — Frank D., Aug 26 '15 at 09:35
Because there is one functionality : Read more. If my textview have more than 4 line , then Read More is visible otherwise Read More is invisible. — Chirag Savsani, Aug 26 '15 at 09:37

joe · Answer 1 · 2018-08-20T10:06:13.480

I have an example in RecyclerView,this is work well.

 mDes.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
                @Override
                public boolean onPreDraw() {
                    mDes.getViewTreeObserver().removeOnPreDrawListener(this);
                    int lineCount = mDes.getLineCount();
                    Log.e("TreeObserver", "onBind: " + lineCount1);
                    if (lineCount1 < 4 || isExpand) {
                        mArrowContainer.setVisibility(View.GONE);
                    } else {
                        mArrowContainer.setVisibility(View.VISIBLE);
                    }
                    return true;
                }
            });

score 0 · Answer 2 · edited May 23 '17 at 11:53

0

Try getting the visible part of your text in the TextView and check if that is equal to the original input, check out this topic Get current visible text in textview. I haven't tried the code, but it's worth a shot. You'll get something like this:

String input = "....... Long String.........";
view.textView.setMaxLines(4); //this limits the number of lines to 4
view.textView.setText(input);

//now check if the text in your textview is completely visible.
//if not, show ReadMore
int start = view.textView.getLayout().getLineStart(0); //start position
int end = view.textView.getLayout().getLineEnd(textView.getLineCount() - 1); //last visible position

String displayedText = view.textView.getText().toString().substring(start, end); //the piece of text that is in fact visible

if(displayedText.equals(input ){
   //text fits entirely in textview
   view.tv_read_more.setVisibility(View.GONE);
}else{
   //show "read more"
   view.tv_read_more.setVisibility(View.VISIBLE);
}

edited May 23 '17 at 11:53

Community

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1

answered Aug 26 '15 at 09:44

Frank D.

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Hmm ok I m working on this now and will be right back after doing this. – Chirag Savsani Aug 26 '15 at 09:53
NullPointerException at int start = view.textView.getLayout().getLineStart(0); – Chirag Savsani Aug 26 '15 at 10:09
1

This topic has the solution for the exception http://stackoverflow.com/questions/16558948/how-to-use-textview-getlayout-it-returns-null – Frank D. Aug 26 '15 at 10:17
still getting NullPointerException. and Thanks for Help. – Chirag Savsani Aug 26 '15 at 11:06

textView.getLineCount() is not working as expected

2 Answers2