java - Correct way to change Collapseble Toolbar title -

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when change title of collapsed collapsingtoolbar, title not change.

tried getsupportactionbar.settitle , collapsetoolbar.settitle. did not help. tell me , what's problem ?

i believe this issue describes experiencing. had issue , solved today. code handles collapsing text update text when current text null or size of text changes. bug closed , patch scheduled future release of design library. use workaround of changing size of text , changing back.

this have

private void setcollapsingtoolbarlayouttitle(string title) {     mcollapsingtoolbarlayout.settitle(title);     mcollapsingtoolbarlayout.setexpandedtitletextappearance(r.style.expandedappbar);     mcollapsingtoolbarlayout.setcollapsedtitletextappearance(r.style.collapsedappbar);     mcollapsingtoolbarlayout.setexpandedtitletextappearance(r.style.expandedappbarplus1);     mcollapsingtoolbarlayout.setcollapsedtitletextappearance(r.style.collapsedappbarplus1); }

in styles.xml have

<style name="expandedappbar" parent="@android:style/textappearance.medium">     <item name="android:textsize">28sp</item>     <item name="android:textcolor">#000</item>     <item name="android:textstyle">bold</item> </style>  <style name="collapsedappbar" parent="@android:style/textappearance.medium">     <item name="android:textsize">24sp</item>     <item name="android:textcolor">@color/white</item>     <item name="android:textstyle">normal</item> </style>  <style name="expandedappbarplus1" parent="@android:style/textappearance.medium">     <item name="android:textsize">28.5sp</item>     <item name="android:textcolor">#000</item>     <item name="android:textstyle">bold</item> </style>  <style name="collapsedappbarplus1" parent="@android:style/textappearance.medium">     <item name="android:textsize">24.5sp</item>     <item name="android:textcolor">@color/white</item>     <item name="android:textstyle">normal</item> </style>

happy coding.

edit: below code collapsingtext helper used inside collapsing toolbar layout control text of view.

        if(availablewidth > 0.0f) {             updatedrawtext = this.mcurrenttextsize != newtextsize;             this.mcurrenttextsize = newtextsize;         }          if(this.mtexttodraw == null || updatedrawtext) {             this.mtextpaint.settextsize(this.mcurrenttextsize);             charsequence title = textutils.ellipsize(this.mtext, this.mtextpaint, availablewidth, truncateat.end);             if(this.mtexttodraw == null || !this.mtexttodraw.equals(title)) {                 this.mtexttodraw = title;             }              this.mtextwidth = this.mtextpaint.measuretext(this.mtexttodraw, 0, this.mtexttodraw.length());         }

the offending lines updatedrawtext = this.mcurrenttextsize != newtextsize; sets boolean determine if change text in line if(this.mtexttodraw == null || updatedrawtext) { when collapsing toolbar layout recalculates view determining factor set text textsize. if did not change text size collapsing toolbar layout title not change untill collapsed or expanded collapsed position


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