Program: 171209
Project: 171209
Buggy source:
@Override protected void onCreate(Bundle savedInstanceState){
  super.onCreate(savedInstanceState);
  requestWindowFeature(Window.FEATURE_NO_TITLE);
  setContentView(R.layout.activity_enterpin);
  mTextAttempts=(TextView)findViewById(R.id.attempts);
  mTextTitle=(TextView)findViewById(R.id.title);
  mIndicatorDots=(IndicatorDots)findViewById(R.id.indicator_dots);
  mImageViewFingerView=(AppCompatImageView)findViewById(R.id.fingerView);
  mTextFingerText=(TextView)findViewById(R.id.fingerText);
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    showFingerprint=(AnimatedVectorDrawable)getDrawable(R.drawable.show_fingerprint);
    fingerprintToTick=(AnimatedVectorDrawable)getDrawable(R.drawable.fingerprint_to_tick);
    fingerprintToCross=(AnimatedVectorDrawable)getDrawable(R.drawable.fingerprint_to_cross);
    mSetPin=getIntent().getBooleanExtra(EXTRA_SET_PIN,false);
    if (mSetPin) {
      changeLayoutForSetPin();
    }
 else {
      String pin=getPinFromSharedPreferences();
      if (pin.equals("String_Node_Str")) {
        changeLayoutForSetPin();
        mSetPin=true;
      }
 else {
        checkForFingerPrint();
      }
    }
    final PinLockListener pinLockListener=new PinLockListener(){
      @Override public void onComplete(      String pin){
        if (mSetPin) {
          setPin(pin);
        }
 else {
          checkPin(pin);
        }
      }
      @Override public void onEmpty(){
        Log.d(TAG,"String_Node_Str");
      }
      @Override public void onPinChange(      int pinLength,      String intermediatePin){
        Log.d(TAG,"String_Node_Str" + pinLength + "String_Node_Str"+ intermediatePin);
      }
    }
;
    mPinLockView=(PinLockView)findViewById(R.id.pinlockView);
    mIndicatorDots=(IndicatorDots)findViewById(R.id.indicator_dots);
    mPinLockView.attachIndicatorDots(mIndicatorDots);
    mPinLockView.setPinLockListener(pinLockListener);
    mPinLockView.setPinLength(PIN_LENGTH);
    mIndicatorDots.setIndicatorType(IndicatorDots.IndicatorType.FILL_WITH_ANIMATION);
    checkForFont();
  }
}

Fixed version (ground truth):
@Override protected void onCreate(Bundle savedInstanceState){
  super.onCreate(savedInstanceState);
  requestWindowFeature(Window.FEATURE_NO_TITLE);
  setContentView(R.layout.activity_enterpin);
  mTextAttempts=(TextView)findViewById(R.id.attempts);
  mTextTitle=(TextView)findViewById(R.id.title);
  mIndicatorDots=(IndicatorDots)findViewById(R.id.indicator_dots);
  mImageViewFingerView=(AppCompatImageView)findViewById(R.id.fingerView);
  mTextFingerText=(TextView)findViewById(R.id.fingerText);
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    showFingerprint=(AnimatedVectorDrawable)getDrawable(R.drawable.show_fingerprint);
    fingerprintToTick=(AnimatedVectorDrawable)getDrawable(R.drawable.fingerprint_to_tick);
    fingerprintToCross=(AnimatedVectorDrawable)getDrawable(R.drawable.fingerprint_to_cross);
  }
  mSetPin=getIntent().getBooleanExtra(EXTRA_SET_PIN,false);
  if (mSetPin) {
    changeLayoutForSetPin();
  }
 else {
    String pin=getPinFromSharedPreferences();
    if (pin.equals("String_Node_Str")) {
      changeLayoutForSetPin();
      mSetPin=true;
    }
 else {
      checkForFingerPrint();
    }
  }
  final PinLockListener pinLockListener=new PinLockListener(){
    @Override public void onComplete(    String pin){
      if (mSetPin) {
        setPin(pin);
      }
 else {
        checkPin(pin);
      }
    }
    @Override public void onEmpty(){
      Log.d(TAG,"String_Node_Str");
    }
    @Override public void onPinChange(    int pinLength,    String intermediatePin){
      Log.d(TAG,"String_Node_Str" + pinLength + "String_Node_Str"+ intermediatePin);
    }
  }
;
  mPinLockView=(PinLockView)findViewById(R.id.pinlockView);
  mIndicatorDots=(IndicatorDots)findViewById(R.id.indicator_dots);
  mPinLockView.attachIndicatorDots(mIndicatorDots);
  mPinLockView.setPinLockListener(pinLockListener);
  mPinLockView.setPinLength(PIN_LENGTH);
  mIndicatorDots.setIndicatorType(IndicatorDots.IndicatorType.FILL_WITH_ANIMATION);
  checkForFont();
}