public void setOnPatternClearedListener(OnPatternClearedListener onPatternClearedListener) {
        this.onPatternClearedListener = onPatternClearedListener;
    }
Set the call back for pattern clear.

@param onPatternClearedListener The call back.
android-patternview/src/main/java/com/eftimoff/patternview/PatternView.java