Android/Java EditableTextView Line Count -

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i trying teach myself android java programming , have started attempting create simple text editor.

i wanted have line count down left hand side standard ides, , couldn't find anywhere on stackexchange or internet on definitive "best practice" way this.

so created own logic based on read, wanted check best , efficient way -- , if happens out looking same thing.

// start oncreate  // @medittext = main autocompletetextview // @mlinecount = line count textview  medittext.addtextchangedlistener(new textwatcher() {   // set current line variable   private int currentline;    // text watcher   public void beforetextchanged(charsequence s, int start, int count, int after) {      // before new text inserted, current line count     currentline = medittext.getlinecount();    }   public void ontextchanged(charsequence s, int start, int before, int count) {      // nothing    }   @override   public void aftertextchanged(editable e) {      // update line count     // @medittext: autocompletetextview input     // @mlinecount: textview output     // @currentline: integer     updatelinecount(medittext, mlinecount, currentline);    } });  // end oncreate  public void updatelinecount(autocompletetextview edittext, textview linetext, int currentline){    // updated line count   int linecount = edittext.getlinecount();    // if line count exists , not "before" line count (to stop repeating)   if(linecount > 0 && linecount != currentline){      // if "before" line count smaller, push line count     if(currentline < linecount){       linetext.append(integer.tostring(linecount) + "\n");     }     // else if "before" line count greater (ie. have deleted line), push line count down     else {       // text of current linetext textview, replace substring of       // current linetext textview - length of deleted line       // (ie. line 9 = 1 character + 1 line break; line 10 = 2 characters + 1 etc)       linetext.settext(linetext.gettext().tostring().substring(0, linetext.gettext().tostring().length() - (integer.tostring(linecount+1).length() + 1)));     }   }   return; }

so yeah, working fine -- not sure last line -- seems abit ... resource wasteful .. replacing entire linetext textview content each time line deleted.

is there anti-append might work better in situation?

thanks, jamie

if(linecount > 0 && linecount != currentline){

what happend if select text , delete all.
not meet condition.
so, mabe text line still display "5 lines" rather "0 line"


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