indexoutofboundexception : setSpan (2...2) ends beyond length 1

Question

I've a MultiAutoCompleteTextView custom control in which I am creating chips text, when user presses the space key.

I do not want the user to input space initially when the textbox is empty so I put an inputFilter in order to prevent user from putting space initially.

Here's the Filter Code:

private void RestrictUselessSpaces(){
    InputFilter filter = new InputFilter() { 

        public CharSequence filter(CharSequence source, int start, int end, 
Spanned dest, int dstart, int dend) { 

            for (int i = start; i < end; i++) { 
                if (Character.isWhitespace(source.charAt(i))) { 

                    if(!getText().toString().trim().equals(""))
                    {
                        return " "; 
                    }
                    else
                    {
                        return "";
                    }
                } 
        } 
        return null; 
        } 
};  

    setFilters(new InputFilter[]{filter});
}

Somehow when I comment RestrictUselessSpaces function. It works fine. But when this function runs. Than if I try to enter space after a character. It gives me the indexoutofboundexception error. Here's my code where I get the error.

public void setChips(String s){

    if(s.contains(" ") && !s.trim().equals("")) // check space in string
    {
        this.chips = s.trim().split(" ");

        SpannableStringBuilder ssb = new SpannableStringBuilder(getText());
        // split string wich comma
        int x =0;
        // loop will generate ImageSpan for every country name separated by comma
        for(String c : chips){
            // inflate chips_edittext layout 
            LayoutInflater lf = (LayoutInflater) getContext().getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
            TextView textView = (TextView) lf.inflate(R.layout.chips_edittext, null);
            textView.setText(c); // set text


            setFlags(textView, c); // set flag image
            // capture bitmapt of genreated textview
            int spec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
            textView.measure(spec, spec);
            textView.layout(0, 0, textView.getMeasuredWidth(), textView.getMeasuredHeight());
            Bitmap b = Bitmap.createBitmap(textView.getWidth(), textView.getHeight(),Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(b);
            canvas.translate(-textView.getScrollX(), -textView.getScrollY());
            textView.draw(canvas);
            textView.setDrawingCacheEnabled(true);
            Bitmap cacheBmp = textView.getDrawingCache();
            Bitmap viewBmp = cacheBmp.copy(Bitmap.Config.ARGB_8888, true);
            textView.destroyDrawingCache();  // destory drawable
            // create bitmap drawable for imagespan
            BitmapDrawable bmpDrawable = new BitmapDrawable(viewBmp);
            bmpDrawable.setBounds(0, 0,bmpDrawable.getIntrinsicWidth(),bmpDrawable.getIntrinsicHeight());
            // create and set imagespan 
            ssb.setSpan(new ImageSpan(bmpDrawable),x ,x + c.length() , Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);    
            x = x+ c.length() +1;
        }

        // set chips span 
        setText(ssb);


        // move cursor to last 
        setSelection(s.length());
    }

}

The line ssb.setSpan is causing the problem but when I debug the code. The debugger runs this line without giving me any kind of exception. Error occurs after the execution of this function which is making it more hard for me to identify what actually is causing the problem.

And here's my logcat:

08-10 20:04:19.253: E/AndroidRuntime(18461): FATAL EXCEPTION: main
08-10 20:04:19.253: E/AndroidRuntime(18461): Process: com.example.twitter, PID: 18461
08-10 20:04:19.253: E/AndroidRuntime(18461): java.lang.IndexOutOfBoundsException: setSpan (2 ... 2) ends beyond length 1
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.text.SpannableStringBuilder.checkRange(SpannableStringBuilder.java:1016)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:592)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:588)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.text.Selection.setSelection(Selection.java:76)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.text.Selection.setSelection(Selection.java:87)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.widget.EditText.setSelection(EditText.java:94)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at com.example.libraries.ChipsMultiAutoCompleteTextview.setChips(ChipsMultiAutoCompleteTextview.java:281)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at com.example.libraries.ChipsMultiAutoCompleteTextview$1.onTextChanged(ChipsMultiAutoCompleteTextview.java:192)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.widget.TextView.sendOnTextChanged(TextView.java:7429)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.widget.TextView.handleTextChanged(TextView.java:7488)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:9203)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:962)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:496)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:435)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:30)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:675)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.view.inputmethod.BaseInputConnection.commitText(BaseInputConnection.java:197)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at com.android.internal.widget.EditableInputConnection.commitText(EditableInputConnection.java:183)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:279)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:77)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.os.Handler.dispatchMessage(Handler.java:102)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.os.Looper.loop(Looper.java:212)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at android.app.ActivityThread.main(ActivityThread.java:5151)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at java.lang.reflect.Method.invokeNative(Native Method)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at java.lang.reflect.Method.invoke(Method.java:515)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:877)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
08-10 20:04:19.253: E/AndroidRuntime(18461):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

try using this

setSelection(s.length() - 1);