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fill-rule="evenodd" clip-rule="evenodd" d="M3.57 14.67c0-.57.13-1.11.38-1.6l.02-.02v-.02l.02-.02c0-.02 0-.02.02-.02.12-.26.3-.52.57-.8L7.78 9v-.02l.01-.02c.44-.41.91-.7 1.44-.85a4.87 4.87 0 0 0-1.19 2.36A5.04 5.04 0 0 0 8 11.6L6.04 13.6c-.19.19-.32.4-.38.65a2 2 0 0 0 0 .9c.08.2.2.4.38.57l1.29 1.31c.27.28.62.42 1.03.42.42 0 .78-.14 1.06-.42l1.23-1.25.79-.78 1.15-1.16c.08-.09.19-.22.28-.4.1-.2.15-.42.15-.67 0-.16-.02-.3-.06-.45l-.02-.02v-.02l-.07-.14s0-.03-.04-.06l-.06-.13-.02-.02c0-.02 0-.03-.02-.05a.6.6 0 0 0-.14-.16l-.48-.5c0-.04.02-.1.04-.15l.06-.12 1.17-1.14.09-.09.56.57c.02.04.08.1.16.18l.05.04.03.06.04.05.03.04.04.06.1.14.02.02c0 .02.01.03.03.04l.1.2v.02c.1.16.2.38.3.68a1 1 0 0 1 .04.25 3.2 3.2 0 0 1 .02 1.33 3.49 3.49 0 0 1-.95 1.87l-.66.67-.97.97-1.56 1.57a3.4 3.4 0 0 1-2.47 1.02c-.97 0-1.8-.34-2.49-1.03l-1.3-1.3a3.55 3.55 0 0 1-1-2.51v-.01h-.02v.02zm5.39-3.43c0-.19.02-.4.07-.63.13-.74.44-1.37.95-1.87l.66-.67.97-.98 1.56-1.56c.68-.69 1.5-1.03 2.47-1.03.97 0 1.8.34 2.48 1.02l1.3 1.32a3.48 3.48 0 0 1 1 2.48c0 .58-.11 1.11-.37 1.6l-.02.02v.02l-.02.04c-.14.27-.35.54-.6.8L16.23 15l-.01.02-.01.02c-.44.42-.92.7-1.43.83a4.55 4.55 0 0 0 1.23-3.52L18 10.38c.18-.21.3-.42.35-.65a2.03 2.03 0 0 0-.01-.9 1.96 1.96 0 0 0-.36-.58l-1.3-1.3a1.49 1.49 0 0 0-1.06-.42c-.42 0-.77.14-1.06.4l-1.2 1.27-.8.8-1.16 1.15c-.08.08-.18.21-.29.4a1.66 1.66 0 0 0-.08 1.12l.02.03v.02l.06.14s.01.03.05.06l.06.13.02.02.01.02.01.02c.05.08.1.13.14.16l.47.5c0 .04-.02.09-.04.15l-.06.12-1.15 1.15-.1.08-.56-.56a2.3 2.3 0 0 0-.18-.19c-.02-.01-.02-.03-.02-.04l-.02-.02a.37.37 0 0 1-.1-.12c-.03-.03-.05-.04-.05-.06l-.1-.15-.02-.02-.02-.04-.08-.17v-.02a5.1 5.1 0 0 1-.28-.69 1.03 1.03 0 0 1-.04-.26c-.06-.23-.1-.46-.1-.7v.01z" fill="#A8A8A8"/></svg></span></button></div></div></div></div></header><span class="l"></span><section><div><div class="gg as hw hx hy hz"></div><div class="ia ib ic id ie"><div class=""><h1 id="930d" class="pw-post-title if ig ih bn ii ij ik il im in io ip iq ir is it iu iv iw ix iy iz ja jb jc jd gi">Flag Attributes in Android — How to Use Them</h1></div><figure class="fr ft jf jg jh ji fn fo paragraph-image"><div role="button" tabindex="0" class="jj jk dp jl cf jm"><div class="fn fo je"><img alt="" class="cf jn jo" src="https://miro.medium.com/max/1400/1*0MdHo7i3dNPY9QwQ7dT0jQ.png" width="700" height="280" loading="lazy" role="presentation"></div></div></figure><p id="3674" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">I’m sure you have seen something like the following line very often while writing the XML attributes for your views or layouts.</p><pre class="kn ko kp kq fz kr bt ks"><span id="cf19" class="gi kt ku ih kv b dn kw kx l ky">attribute="option1|option2"</span></pre><p id="541f" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">Notice the <strong class="jr ii">|</strong> between the options. It is not only a fancy separator, it is a bitwise operator merging the two options into one single value.</p><p id="fe64" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">The following will explain what exactly Bit Flags are, how to declare custom XML flag attributes and how to read and work with them in the code.</p></div><div class="o dy kz la hm lb" role="separator"><span class="lc gd cj ld le lf"></span><span class="lc gd cj ld le lf"></span><span class="lc gd cj ld le"></span></div><div class="ia ib ic id ie"><h1 id="c9ce" class="lg ku ih bn lh li lj lk ll lm ln lo lp lq lr ls lt lu lv lw lx ly lz ma mb mc gi">What Are Bit Flags?</h1><p id="ea8a" class="pw-post-body-paragraph jp jq ih jr b js md ju jv jw me jy jz ka mf kc kd ke mg kg kh ki mh kk kl km ia gi">Generally you can see Bit Flags as a number of boolean values stored in one single value.</p><p id="6368" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">In the binary system a bit has two states: <strong class="jr ii">on</strong> and <strong class="jr ii">off</strong>. Now think about a row of bits where every bit is an indicator for one of your options. When the option is set, the bit has the value 1. If not, it has the value 0.</p><pre class="kn ko kp kq fz kr bt ks"><span id="ff9e" class="gi kt ku ih kv b dn kw kx l ky">110</span></pre><p id="eac5" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">We read this <strong class="jr ii">from right to left</strong>.<br>The bit for our first option is <strong class="jr ii">0</strong>. That means the option is <strong class="jr ii">not set</strong>. Whereas the bits for the second and third options are <strong class="jr ii">1</strong>. This means they are <strong class="jr ii">set</strong>.</p><p id="b6da" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">Every integer value has a representation in the binary system and and vice versa.</p><pre class="kn ko kp kq fz kr bt ks"><span id="1b00" class="gi kt ku ih kv b dn kw kx l ky">0 = <strong class="kv ii">0</strong>*2³ + <strong class="kv ii">0</strong>*2² + <strong class="kv ii">0</strong>*2¹ + <strong class="kv ii">0</strong>*2⁰ = 0000<br>1 = <strong class="kv ii">0</strong>*2³ + <strong class="kv ii">0</strong>*2² + <strong class="kv ii">0</strong>*2¹ + <strong class="kv ii">1</strong>*2⁰ = 0001<br>2 = <strong class="kv ii">0</strong>*2³ + <strong class="kv ii">0</strong>*2² + <strong class="kv ii">1</strong>*2¹ + <strong class="kv ii">0</strong>*2⁰ = 0010<br>4 = <strong class="kv ii">0</strong>*2³ + <strong class="kv ii">1</strong>*2² + <strong class="kv ii">0</strong>*2¹ + <strong class="kv ii">0</strong>*2⁰ = 0100<br>8 = <strong class="kv ii">1</strong>*2³ + <strong class="kv ii">0</strong>*2² + <strong class="kv ii">0</strong>*2¹ + <strong class="kv ii">0</strong>*2⁰ = 1000</span></pre><p id="2244" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">This means we can store our Bit Flag value as a plain integer value. And we can use the bitwise operators (more about them later) directly on integer values.</p></div><div class="o dy kz la hm lb" role="separator"><span class="lc gd cj ld le lf"></span><span class="lc gd cj ld le lf"></span><span class="lc gd cj ld le"></span></div><div class="ia ib ic id ie"><h1 id="98b3" class="lg ku ih bn lh li lj lk ll lm ln lo lp lq lr ls lt lu lv lw lx ly lz ma mb mc gi">Declaring XML Flag Attributes</h1><p id="557e" class="pw-post-body-paragraph jp jq ih jr b js md ju jv jw me jy jz ka mf kc kd ke mg kg kh ki mh kk kl km ia gi">Now, let’s assume that we want to create a custom view called <strong class="jr ii">MyView</strong> which can draw a border around itself, and that we want to specify on which sites (top, right, bottom, left) it should draw the borders using an XML flag attribute.<br>I will <strong class="jr ii">not</strong> explain how to actually draw something, I will only explain how to work with flags.</p><p id="d1a0" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">We can declare XML flag attributes like any other attribute. You can find an official documentation <a class="au mi" href="https://developer.android.com/training/custom-views/create-view.html#customattr" rel="noopener ugc nofollow" target="_blank">here</a>.</p><p id="3d1c" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">In our <strong class="jr ii">values/attrs.xml</strong> file we declare the new attribute called <strong class="jr ii">drawBorder</strong> for our view called <strong class="jr ii">MyView</strong>.</p><pre class="kn ko kp kq fz kr bt ks"><span id="6dda" class="gi kt ku ih kv b dn kw kx l ky"><resources><br> <declare-styleable name="<strong class="kv ii">MyView</strong>"><br> <attr name="<strong class="kv ii">drawBorder</strong>"><br> <flag name="none" value="<strong class="kv ii">0</strong>" /><br> <flag name="top" value="<strong class="kv ii">1</strong>" /><br> <flag name="right" value="<strong class="kv ii">2</strong>" /><br> <flag name="bottom" value="<strong class="kv ii">4</strong>" /><br> <flag name="left" value="<strong class="kv ii">8</strong>" /><br> <flag name="all" value="<strong class="kv ii">15</strong>" /><br> </attr><br> ...<br> </declare-styleable><br></resources></span></pre><p id="273e" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">Look exactly at the values we have set for the options.<br>We essentially have 4 options (top, right, bottom, left). The other two options are used to specify that no option is set or that all options are set.<br>The values for the 4 options are chosen, so that when you write them in the binary system, these two statements are fulfilled:</p><ul class=""><li id="dc67" class="mj mk ih jr b js jt jw jx ka ml ke mm ki mn km mo mp mq mr gi">Every value has exactly one bit which is set to 1. All other bits are 0.</li><li id="e466" class="mj mk ih jr b js ms jw mt ka mu ke mv ki mw km mo mp mq mr gi">None of the values have the same bit set to 1.</li></ul><figure class="kn ko kp kq fz ji fn fo paragraph-image"><div role="button" tabindex="0" class="jj jk dp jl cf jm"><div class="fn fo mx"><img alt="" class="cf jn jo" src="https://miro.medium.com/max/1400/1*C40RkP6OklGFMd9vK-zYJQ.png" width="700" height="380" loading="lazy" role="presentation"></div></div></figure><p id="009e" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">The option <strong class="jr ii"><em class="my">none</em></strong> is used to indicate that none of the 4 options is set. And the option <strong class="jr ii"><em class="my">all</em></strong> is the sum of the values of the 4 options and indicates that all of the 4 options are set.</p><p id="4a0b" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">We can now use our custom attribute like this in our custom View:</p><pre class="kn ko kp kq fz kr bt ks"><span id="eb42" class="gi kt ku ih kv b dn kw kx l ky"><my.package.name.MyView<br> android:layout_width="match_parent"<br> android:layout_height="wrap_content"<br> app:drawBorder="bottom|top" /></span></pre></div><div class="o dy kz la hm lb" role="separator"><span class="lc gd cj ld le lf"></span><span class="lc gd cj ld le lf"></span><span class="lc gd cj ld le"></span></div><div class="ia ib ic id ie"><h1 id="237a" class="lg ku ih bn lh li lj lk ll lm ln lo lp lq lr ls lt lu lv lw lx ly lz ma mb mc gi">Read XML Flag Attributes</h1><p id="721e" class="pw-post-body-paragraph jp jq ih jr b js md ju jv jw me jy jz ka mf kc kd ke mg kg kh ki mh kk kl km ia gi">Let’s start with the basic class for our custom View. We should declare a constant for each of our options with an equal value as declared above. And a variable for the value that we get from reading the XML attribute. You can have a look about how to read attributes <a class="au mi" href="https://developer.android.com/training/custom-views/create-view.html#applyattr" rel="noopener ugc nofollow" target="_blank">here</a>.</p><pre class="kn ko kp kq fz kr bt ks"><span id="1653" class="gi kt ku ih kv b dn kw kx l ky">public MyView extends View{</span><span id="8776" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky"> <strong class="kv ii">// Constants for the flags<br> private static final int BORDER_NONE_DEFAULT = 0;<br> private static final int BORDER_TOP = 1;<br> private static final int BORDER_RIGHT = 2;<br> private static final int BORDER_BOTTOM = 4;<br> private static final int BORDER_LEFT = 8;</strong></span><span id="546c" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky"><strong class="kv ii"> // Variable for the current value<br> private int mDrawBorder = BORDER_NONE_DEFAULT;</strong></span><span id="5cde" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky"> public MyView(Context context){<br> // Delegate to next constructor<br> this(context, null);<br> }</span><span id="f925" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky"> public MyView(Context context, AttributeSet attrs){<br> // Delegate to next constructor<br> this(context, attrs, 0); <br> }</span><span id="538b" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky"> public MyView(Context context, AttributeSet attrs,<br> int defStyleAttr){<br> super(context, attrs, defStyleAttr);</span><span id="6f1a" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky"> <strong class="kv ii">// Read attributes<br> TypedArray a = context.getTheme().obtainStyledAttributes(<br> attrs, R.styleable.MyView);</strong></span><span id="38b1" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky"><strong class="kv ii"> try {<br> mDrawBorder = a.getInteger(<br> R.styleable.MyView_drawBorder,<br> BORDER_NONE_DEFAULT);<br> } finally {<br> a.recycle();<br> }</strong><br> }<br> ...<br>}</span></pre><p id="6354" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">We have now assigned the value specified in the XML layout file to the <strong class="jr ii"><em class="my">mDrawBorder</em></strong> variable. If the attribute does not exists in the layout the <strong class="jr ii"><em class="my">BORDER_NONE_DEFAULT</em></strong> value is used.</p></div><div class="o dy kz la hm lb" role="separator"><span class="lc gd cj ld le lf"></span><span class="lc gd cj ld le lf"></span><span class="lc gd cj ld le"></span></div><div class="ia ib ic id ie"><h1 id="e1c8" class="lg ku ih bn lh li lj lk ll lm ln lo lp lq lr ls lt lu lv lw lx ly lz ma mb mc gi">Working With Bit Flags</h1><p id="551a" class="pw-post-body-paragraph jp jq ih jr b js md ju jv jw me jy jz ka mf kc kd ke mg kg kh ki mh kk kl km ia gi">Okay, how do we know which of our options were set when we only get one value? That’s why we have defined the constants for our options.</p><p id="5a09" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">There are bitwise operators we can use to check if an option is contained in the current <strong class="jr ii">mDrawBorder</strong> value and to enable or disable or toggle an option. Let’s have a look at them:</p><pre class="kn ko kp kq fz kr bt ks"><span id="b2e4" class="gi kt ku ih kv b dn kw kx l ky"><strong class="kv ii">| (bitwise logically or)</strong><br>Example: 100 | 001 = 101<br>The result has a 1 on the position where at least one value has a 1.</span><span id="8458" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky"><strong class="kv ii">& (bitwise logically and)</strong><br>Example: 100 & 101 = 100<br>The result has a 1 on the position where both values have a 1.</span><span id="0115" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky"><strong class="kv ii">~ (bitwise inverse)</strong><br>Example: ~100 = 011<br>All bits get inverted.</span><span id="af80" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky"><strong class="kv ii">^ (bitwise exclusive or)</strong><br>Example: 100^101 = 001<br>The result has a 1 on the position where one value has a 1 whereas the other value has a 0.</span></pre><p id="c03f" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">Let’s assume we have used the attribute in the following two ways. Yes, technically they are correct, but they may look weird 😵.</p><pre class="kn ko kp kq fz kr bt ks"><span id="fd22" class="gi kt ku ih kv b dn kw kx l ky"><strong class="kv ii">Example 1:</strong> app:drawBorder="none|top"</span></pre><p id="096d" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">In this first example the values of <strong class="jr ii"><em class="my">none</em></strong> (0 = 000) and <strong class="jr ii"><em class="my">top</em></strong> (1 = 001) get combined by the logically or-operator <strong class="jr ii">|</strong> to the value (001 = 1). The result still contains the flag value for <strong class="jr ii"><em class="my">top</em></strong> (which is 1). And also for <strong class="jr ii"><em class="my">none</em></strong> (which is 0) because every flag-set contains the 0-flag at every time.</p><pre class="kn ko kp kq fz kr bt ks"><span id="e78b" class="gi kt ku ih kv b dn kw kx l ky"><strong class="kv ii">Example 2:</strong> app:drawBorder="bottom|all"</span></pre><p id="61e7" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">In this second example the values of <strong class="jr ii"><em class="my">bottom</em></strong> (3 =0011) and <strong class="jr ii"><em class="my">all</em></strong> (15 = 1111) get combined to (1111 = 15). The result still contains the flag for <strong class="jr ii"><em class="my">bottom</em></strong> since <strong class="jr ii"><em class="my">all</em></strong> enables the bits for all of the 4 options.</p><h2 id="3f0a" class="kt ku ih bn lh ne nf ng ll nh ni nj lp ka nk nl lt ke nm nn lx ki no np mb nq gi">Check If a Flag is Contained in The Set</h2><p id="914e" class="pw-post-body-paragraph jp jq ih jr b js md ju jv jw me jy jz ka mf kc kd ke mg kg kh ki mh kk kl km ia gi">Now we need to check which option is contained in the value of the <strong class="jr ii"><em class="my">mDrawBorder</em></strong> variable. We do this by calling the following method:</p><pre class="kn ko kp kq fz kr bt ks"><span id="349d" class="gi kt ku ih kv b dn kw kx l ky">private boolean containsFlag(int flagSet, int flag){<br> <strong class="kv ii">return (flagSet|flag) == flagSet;</strong><br>}</span><span id="efc1" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky">// Method call<br>boolean drawBorderTop = containsFlag(mDrawBorder, BORDER_TOP);</span></pre><p id="a327" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">We try to add the flag to the existing flag-set and if the value of the flag-set does not change, we can combine that the flag was already contained.</p><h2 id="0923" class="kt ku ih bn lh ne nf ng ll nh ni nj lp ka nk nl lt ke nm nn lx ki no np mb nq gi">Add a Flag to The Set</h2><p id="4c67" class="pw-post-body-paragraph jp jq ih jr b js md ju jv jw me jy jz ka mf kc kd ke mg kg kh ki mh kk kl km ia gi">Adding a flag is pretty simple. We use the same operator (The logically or-operator) like in the XML attributes:</p><pre class="kn ko kp kq fz kr bt ks"><span id="a87d" class="gi kt ku ih kv b dn kw kx l ky">private int addFlag(int flagSet, int flag){<br> <strong class="kv ii">return flagSet|flag;</strong><br>}</span><span id="0290" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky">// Method call<br>mDrawBorder = addFlag(mDrawBorder, BORDER_LEFT);</span></pre><p id="f35e" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">We do not need to check if the flag-set already contains the flag that we want to add. When it is already contained, the value simply stays the same.</p><h2 id="ee74" class="kt ku ih bn lh ne nf ng ll nh ni nj lp ka nk nl lt ke nm nn lx ki no np mb nq gi">Toggle a Flag in The Set</h2><p id="d7c2" class="pw-post-body-paragraph jp jq ih jr b js md ju jv jw me jy jz ka mf kc kd ke mg kg kh ki mh kk kl km ia gi">Toggling is also very simple.</p><pre class="kn ko kp kq fz kr bt ks"><span id="5c8b" class="gi kt ku ih kv b dn kw kx l ky">private int toggleFlag(int flagSet, int flag){<br> <strong class="kv ii">return flagSet^flag;</strong><br>}</span><span id="b8a6" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky">// Method call<br>mDrawBorder = toggleFlag(mDrawBorder, BORDER_LEFT);</span></pre><p id="fa65" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">Since the exclusive or-operator <strong class="jr ii">^</strong> only keeps the bits where both bits are different, it will remove the bits that are set in the flag when they are also already set in the flag-set. And it will add them if they are not set in the flag-set.</p><pre class="kn ko kp kq fz kr bt ks"><span id="2b34" class="gi kt ku ih kv b dn kw kx l ky"><strong class="kv ii">Example 1:</strong> 110^010 = 100 (Binary)<br> 6 ^ 2 = 4 (Decimal)</span><span id="cf5e" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky"><strong class="kv ii">Example 2:</strong> 100^010 = 110 (Binary)<br> 4 ^ 2 = 6 (Decimal)</span></pre><h2 id="fe39" class="kt ku ih bn lh ne nf ng ll nh ni nj lp ka nk nl lt ke nm nn lx ki no np mb nq gi">Remove a Flag From the Set</h2><p id="5bfd" class="pw-post-body-paragraph jp jq ih jr b js md ju jv jw me jy jz ka mf kc kd ke mg kg kh ki mh kk kl km ia gi">Removing a flag is a bit more complicated (we need two bitwise operators), but still easy.</p><pre class="kn ko kp kq fz kr bt ks"><span id="5f92" class="gi kt ku ih kv b dn kw kx l ky">private int removeFlag(int flagSet, int flag){<br> <strong class="kv ii">return flagSet&(~flag);</strong><br>}</span><span id="0e7a" class="gi kt ku ih kv b dn mz na nb nc nd kx l ky">// Method call<br>mDrawBorder = removeFlag(mDrawBorder, BORDER_LEFT);</span></pre><p id="9031" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">First we invert the flag that we want to remove. Then we combine this with the current flag-set. This means only where the bit in the flag was set, we now have a 0. And that’s why we also have a 0 at this position in the final result. The rest of the result is the same as in the original flag-set. Have a look at this example:</p><pre class="kn ko kp kq fz kr bt ks"><span id="dd43" class="gi kt ku ih kv b dn kw kx l ky">110&(~010) = 110&101 = 100 (Binary)<br> 6 &(~ 2 ) = 6 & 5 = 4 (Decimal)</span></pre></div><div class="o dy kz la hm lb" role="separator"><span class="lc gd cj ld le lf"></span><span class="lc gd cj ld le lf"></span><span class="lc gd cj ld le"></span></div><div class="ia ib ic id ie"><p id="fde9" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">Bit Flags are also a good alternative if you have a lot of boolean values and especially if you want to store them somehow. Instead of saving a lot of booleans you only need to save one integer value.</p><p id="a523" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">You should now be able to define your own flag attributes and work with them in your application. You should also be able to use Bit Flags as an alternative to a number of booleans.<br>When you found this tutorial useful feel free to hit the 💚.</p></div><div class="o dy kz la hm lb" role="separator"><span class="lc gd cj ld le lf"></span><span class="lc gd cj ld le lf"></span><span class="lc gd cj ld le"></span></div><div class="ia ib ic id ie"><p id="c1ec" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">If you have any suggestions on how to improve this tutorial or found a mistake, you can leave a private note at the specific position.</p><p id="5752" class="pw-post-body-paragraph jp jq ih jr b js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km ia gi">Happy coding 💻.</p></div></div></section></div></div></article><div class="nr o"></div></div></div><div class="l"></div><footer class="ns nt nu nv o ao nw nx c"><div class="l ny"><div class="o dy"><div class="en cf ez fa fb fc fd fe ff fg fh"><div class="o 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