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POCan there be conditional statements on custom android attributes?
 

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  1. POCan there be conditional statements on custom android attributes?
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    <p>most of you will know that there is a possibility to give custom Attributes to custom Views in Android. This is explained quite brilliantly for example in <a href="https://stackoverflow.com/q/3441396/2135787">this thread here on Stackoverflow</a>. My question however is:</p> <p><strong>Is it possible to present such attributes only upon fulfillment of another condition?</strong></p> <p>What I mean by that is something like this (Pseudo-code):</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;resources&gt; &lt;declare-styleable name="MyCustomView"&gt; &lt;attr name="isClock" format="boolean" /&gt; &lt;/declare-styleable&gt; &lt;if name="isClock" value="true"&gt; &lt;attr name="timezone" format="string"&gt; &lt;/if&gt; &lt;else&gt; &lt;attr name="somethingElse" format="string&gt; &lt;/else&gt; &lt;/resources&gt; </code></pre> <p>Now one possibility to not have to work with "wrong" attributes is to do this in the Java-Code, obviously:</p> <pre class="lang-java prettyprint-override"><code>public class MyCustomView { public MyCustomView(Context context) { TypedArray styleables = context.obtainStyledAttributes(attrs, R.styleable.MyCustomView); boolean choice = styleables.getBoolean(R.styleable.MyCustomView_isClock, false); if(choice) { // It's a clock, react to the other attrs } else { // Don't react } styleables.recycle(); } } </code></pre> <p>Another way would be to do what ilomambo suggested in his answer: create various custom views with different names and let them only have the attributes that belong to them.</p> <p>But I'm very much asking myself if it's possible to not confuse the programmer of the .xml-File in the first place and offer him only the stuff he really needs combined in one place. After all this <strong>is</strong> in a way already done by Android (well... the IDE/Lint/the Parser...) when hinting for example that the width or height of a view should be set to <code>0dp</code> when using <code>layout_weight</code>.</p> <p>But if I had to guess I'd say it's probably only possible if I rewrite the Android XML-Parser... Can someone please prove me wrong?</p> <p>Thanks in advance</p>
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    2. CO"Is it possible to present such attributes only upon fulfillment of another condition?" -- AFAIK, no.
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