Program: 180929
Project: 180929
Buggy source:
public boolean onPreferenceChange(Preference preference,Object objValue){
  if (KEY_TTS_USE_DEFAULT.equals(preference.getKey())) {
    int value=(Boolean)objValue ? 1 : 0;
    Settings.Secure.putInt(getContentResolver(),TTS_USE_DEFAULTS,value);
    Log.i(TAG,"String_Node_Str" + objValue.toString());
  }
 else   if (KEY_TTS_DEFAULT_RATE.equals(preference.getKey())) {
    mDefaultRate=Integer.parseInt((String)objValue);
    try {
      Settings.Secure.putInt(getContentResolver(),TTS_DEFAULT_RATE,mDefaultRate);
      if (mTts != null) {
        mTts.setSpeechRate((float)(mDefaultRate / 100.0f));
      }
      Log.i(TAG,"String_Node_Str" + mDefaultRate);
    }
 catch (    NumberFormatException e) {
      Log.e(TAG,"String_Node_Str",e);
    }
  }
 else   if (KEY_TTS_DEFAULT_LANG.equals(preference.getKey())) {
    ContentResolver resolver=getContentResolver();
    parseLocaleInfo((String)objValue);
    Settings.Secure.putString(resolver,TTS_DEFAULT_LANG,mDefaultLanguage);
    Settings.Secure.putString(resolver,TTS_DEFAULT_COUNTRY,mDefaultCountry);
    Settings.Secure.putString(resolver,TTS_DEFAULT_VARIANT,mDefaultLocVariant);
    Log.v(TAG,"String_Node_Str" + mDefaultLanguage + "String_Node_Str"+ mDefaultCountry+ "String_Node_Str"+ mDefaultLocVariant);
    if (mTts != null) {
      mTts.setLanguage(new Locale(mDefaultLanguage,mDefaultCountry));
    }
    int newIndex=mDefaultLocPref.findIndexOfValue((String)objValue);
    Log.v("String_Node_Str","String_Node_Str" + newIndex);
    mDemoStringIndex=newIndex > -1 ? newIndex : 0;
  }
 else   if (KEY_TTS_DEFAULT_SYNTH.equals(preference.getKey())) {
    mDefaultEng=objValue.toString();
    Settings.Secure.putString(getContentResolver(),TTS_DEFAULT_SYNTH,mDefaultEng);
    if (mTts != null) {
      mTts.setEngineByPackageName(mDefaultEng);
    }
    Log.v("String_Node_Str","String_Node_Str" + objValue.toString());
  }
  return true;
}

Fixed version (ground truth):
public boolean onPreferenceChange(Preference preference,Object objValue){
  if (KEY_TTS_USE_DEFAULT.equals(preference.getKey())) {
    int value=(Boolean)objValue ? 1 : 0;
    Settings.Secure.putInt(getContentResolver(),TTS_USE_DEFAULTS,value);
    Log.i(TAG,"String_Node_Str" + objValue.toString());
  }
 else   if (KEY_TTS_DEFAULT_RATE.equals(preference.getKey())) {
    mDefaultRate=Integer.parseInt((String)objValue);
    try {
      Settings.Secure.putInt(getContentResolver(),TTS_DEFAULT_RATE,mDefaultRate);
      if (mTts != null) {
        mTts.setSpeechRate((float)(mDefaultRate / 100.0f));
      }
      Log.i(TAG,"String_Node_Str" + mDefaultRate);
    }
 catch (    NumberFormatException e) {
      Log.e(TAG,"String_Node_Str",e);
    }
  }
 else   if (KEY_TTS_DEFAULT_LANG.equals(preference.getKey())) {
    ContentResolver resolver=getContentResolver();
    parseLocaleInfo((String)objValue);
    Settings.Secure.putString(resolver,TTS_DEFAULT_LANG,mDefaultLanguage);
    Settings.Secure.putString(resolver,TTS_DEFAULT_COUNTRY,mDefaultCountry);
    Settings.Secure.putString(resolver,TTS_DEFAULT_VARIANT,mDefaultLocVariant);
    Log.v(TAG,"String_Node_Str" + mDefaultLanguage + "String_Node_Str"+ mDefaultCountry+ "String_Node_Str"+ mDefaultLocVariant);
    if (mTts != null) {
      mTts.setLanguage(new Locale(mDefaultLanguage,mDefaultCountry,mDefaultLocVariant));
    }
    int newIndex=mDefaultLocPref.findIndexOfValue((String)objValue);
    Log.v("String_Node_Str","String_Node_Str" + newIndex);
    mDemoStringIndex=newIndex > -1 ? newIndex : 0;
  }
 else   if (KEY_TTS_DEFAULT_SYNTH.equals(preference.getKey())) {
    mDefaultEng=objValue.toString();
    Settings.Secure.putString(getContentResolver(),TTS_DEFAULT_SYNTH,mDefaultEng);
    if (mTts != null) {
      mTts.setEngineByPackageName(mDefaultEng);
      mEnableDemo=false;
      mVoicesMissing=false;
      updateWidgetState();
      checkVoiceData();
    }
    Log.v("String_Node_Str","String_Node_Str" + objValue.toString());
  }
  return true;
}