Android to determine if navigation Bar is transparent

Set Navigation Bar Transparent

GetWindow (). Addflags (WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);

or add <item name= "Android:windowtranslucentnavigation" in theme >true</item>

  /**     * Convenience function to set the flag bits as specified in flags, as     * per {@link #setFlags}.     * @param flags the flag bits to be set.     * @see #setFlags     * @see #clearFlags */public    void addflags (int flags) {        setflags (flags, flags);    }

/** * Set The flags of the window, as per the * {@link windowmanager.layoutparams windowmanager.layoutparams}     * Flags.     * * <p>note that some flags must being set before the window decoration is * created * {@link #setContentView (View, Android.view.ViewGroup.LayoutParams)} or * {@link #getDecorView ()}: * {@link Windo  Wmanager.layoutparams#flag_layout_in_screen} and * {@link Windowmanager.layoutparams#flag_layout_inset_decor}. These * 'll be set to the based on the {@link Android.     r.attr#windowisfloating} * attribute.     * * @param flags The new window flags (see WINDOWMANAGER.LAYOUTPARAMS).     * @param mask which of the window flag bits to modify. * @see #addFlags * @see #clearFlags */public void setflags (int flags, int mask) {final WINDOWMANAGER.L        Ayoutparams attrs = GetAttributes (); Attrs.flags = (Attrs.flags&~mask) |        (Flags&mask); if ((MASK&AMP;WINDOWMANAGER.LAyoutparams.flag_needs_menu_key)! = 0) {attrs.privateflags |= WindowManager.LayoutParams.PRIVATE_FLAG_SET_NEED        S_menu_key;        } mforcedwindowflags |= Mask;        if (mcallback! = null) {mcallback.onwindowattributeschanged (attrs); }    }

which

Attrs.flags = (Attrs.flags&~mask) | (Flags&mask);

Who can explain the meaning of this line of code? I've forgotten everything I've learned.

So

public boolean existflag (int flags) {    windowmanager.layoutparams attrs= GetWindow (). GetAttributes ();    if (Attrs.flags = = ((attrs.flags&~flags) | (flags&flags))) {    return true;    }    return false;}

KitKat on the validation pass.