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I am getting the following error don't know what's wrong with my code. When its bold and italic then italic text sometimes removed and some time not and then get this error.

2018-11-10 19:34:03.032 16997-16997/com.pilum.apps.primalnotes E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.pilum.apps.primalnotes, PID: 16997
java.lang.IndexOutOfBoundsException: setSpan (-1 ... -1) starts before 0
at android.text.SpannableStringBuilder.checkRange(SpannableStringBuilder.java:1314)
at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:680)
at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:672)
at com.apps.primalnotes.Fragments.EditorFragment.italicText2(EditorFragment.java:393)
at com.apps.primalnotes.Fragments.EditorFragment.access$300(EditorFragment.java:48)
at com.apps.primalnotes.Fragments.EditorFragment$5.onClick(EditorFragment.java:129)
at android.view.View.performClick(View.java:6877)
at android.view.View$PerformClick.run(View.java:26069)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6938)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

 private void italicText2(){
 boolean italicExists = false;
 Spannable str = texto.getText();
 int selStart = texto.getSelectionStart();
 int selEnd = texto.getSelectionEnd();
 StyleSpan styleSpans = texto.getText().getSpans(selStart, selEnd, StyleSpan.class);

 for (StyleSpan styleSpan : styleSpans) 

 int oldStyle = styleSpan.getStyle();
 int spanStart = str.getSpanStart(styleSpan);
 int spanEnd = str.getSpanEnd(styleSpan);

 if (spanStart < texto.getSelectionStart()) 
 str.setSpan(new StyleSpan(oldStyle), spanStart, selStart, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 

 if (spanEnd > texto.getSelectionEnd()) 
 str.setSpan(new StyleSpan(oldStyle), selEnd, spanEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 
 if (selEnd > selStart) 
 if (oldStyle == Typeface.ITALIC) 
 str.removeSpan(styleSpan);
 italicExists = true;
 
 if (oldStyle == Typeface.BOLD_ITALIC) 
 str.setSpan(new StyleSpan(Typeface.BOLD), spanStart, spanEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 italicExists = false;
 
 

 

 if (!italicExists) {
 Log.d("Tag", "italic section entered");
 if (styleSpans.length > 0) 
 int lastSpanEnd = 0;
 for (StyleSpan styleSpan : styleSpans) 
 int oldStyle = styleSpan.getStyle();
 int spanStart = str.getSpanStart(styleSpan);
 int spanEnd = str.getSpanEnd(styleSpan);


 if (spanStart > lastSpanEnd) 
 str.setSpan(new StyleSpan(Typeface.ITALIC), lastSpanEnd, spanStart, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 Log.d("TAG", "if italic");
 

 lastSpanEnd = spanEnd;
 str.removeSpan(styleSpan);

 if (oldStyle == Typeface.BOLD) 
 str.setSpan(new StyleSpan(Typeface.BOLD_ITALIC), spanStart, spanEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 Log.d("TAG", "Bold and Italic");
 
 else 
 **str.setSpan(new StyleSpan(Typeface.ITALIC), spanStart, spanEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);**
 Log.d("TAG", "else italic");
 

 if (spanStart < texto.getSelectionStart()) 
 str.setSpan(new StyleSpan(oldStyle), spanStart, selStart, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 Log.d("TAG", "oldstyle italic");
 

 if (spanEnd > texto.getSelectionEnd()) 
 str.setSpan(new StyleSpan(oldStyle), selEnd, spanEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 Log.d("TAG", "old style end italic");
 
 

 if (selEnd != lastSpanEnd) 
 str.setSpan(new StyleSpan(Typeface.ITALIC), selStart, selEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);