How can I workaround this android TextWatcher restriction? -

i have textwatcher defined on edittext field. within textwatcher.ontextchanged() method, reset edittext value empty string. when

java.lang.indexoutofboundsexception: setspan (2 ... 3) ends beyond length 0     @ android.text.spannablestringbuilder.checkrange(spannablestringbuilder.java:934) 

can suggest workaround safely clear down edittext within textwatcher.

my code ...

textwatcher tw = new textwatcher() {     public void ontextchanged (charsequence chars, int start, int before,int count) {         // if user keys enter, process contents , clear down edittext         if (chars.tostring().indexof("\n") > -1) {             processchars(s.tostring().replace("\n", ""));             edittextfield.settext("");         }     }  };  edittextfield.addtextchangedlistener(tw); 

as @pskink has mentioned in comments, "it error attempt make changes s this callback". so, instead of changing edittext value directly, use handler. example provided below reference.

private edittext medittext; private textwatcher mtextwatcher;  private static final int msg_add_textwatcher = 100; private static final int msg_process_chars = 200; private static final int msg_remove_textwatcher = 300;  private final myhandler mhandler = new myhandler(this); private static class myhandler extends handler {     private final weakreference<mainactivity> myactivity;      public myhandler(mainactivity activity) {         myactivity = new weakreference<mainactivity>(activity);     }      @override     public void handlemessage(message msg) {         mainactivity activity = myactivity.get();         if (activity != null) {             switch (msg.what) {                 case msg_add_textwatcher:                     activity.addtextwatcher();                     break;                 case msg_process_chars:                     activity.processchars(msg.obj.tostring());                     break;                 case msg_remove_textwatcher:                     activity.removetextwatcher();                     break;                 default:                     super.handlemessage(msg);             }         }     } }  ...  @override public void ontextchanged(charsequence s, int start, int before, int count) {     if (s.tostring().indexof("\n") > -1) {         message msg = new message();         msg.what = msg_process_chars;         msg.obj = s.tostring().replace("\n", "");         mhandler.sendmessage(msg);     } }  ...  private void addtextwatcher() {     medittext.addtextchangedlistener(mtextwatcher); }  private void removetextwatcher() {     medittext.removetextchangedlistener(mtextwatcher);     medittext.settext(""); }  private void processchars(string msg) {     toast.maketext(this, msg, toast.length_short).show();     mhandler.sendemptymessage(msg_remove_textwatcher); } 

you need call mhandler.sendemptymessage(msg_add_textwatcher); where/whenever appropriate according project requirements.