public void setInStealthMode(final boolean inStealthMode) {
        this.inStealthMode = inStealthMode;
    }
Set whether the view is in stealth mode. If true, there will be no
visible feedback as the user enters the pattern.

@param inStealthMode Whether in stealth mode.
android-patternview/src/main/java/com/eftimoff/patternview/PatternView.java