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    <p>Since Android makes the <code>R</code> class automatically with resource files under the <code>/res</code> folder, using the <code>R</code> class as <code>final static</code> is impossible.</p> <p>I found a nice solution to use a <code>jar</code> file with the <code>res</code> files. Here is how I did it:</p> <ol> <li><p>In your source code which will be exported in the <code>jar</code> file, <strong>don't use</strong> <code>R</code> variable because it will be replaced with a final static memory address in compile time. Instead of using <code>R</code>, I made my own method below:</p> <pre><code>public static int getResourceIdByName(String packageName, String className, String name) { Class r = null; int id = 0; try { r = Class.forName(packageName + ".R"); Class[] classes = r.getClasses(); Class desireClass = null; for (int i = 0; i &lt; classes.length; i++) { if (classes[i].getName().split("\\$")[1].equals(className)) { desireClass = classes[i]; break; } } if (desireClass != null) { id = desireClass.getField(name).getInt(desireClass); } } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (SecurityException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (NoSuchFieldException e) { e.printStackTrace(); } return id; } </code></pre> <p>For example, if you have a layout named <code>main.xml</code>, you can get it by calling the method:</p> <pre><code>int id = getResourceIdByName(context.getPackageName(), "layout", "main"); </code></pre> <p>If you have a string whose <code>id</code> is "text1", you can get it by calling method</p> <pre><code>int id = getResourceIdByName(context.getPackageName(), "string", "text1"); </code></pre> <p>This method gives you your resource id at runtime. It uses the reflection API to get the status of <code>R</code> at runtime.</p> <p>By using this method you can avoid using the <code>R</code> variable.</p></li> <li><p>Copy your <code>res</code> files to your target project.</p></li> <li><p>Build.</p></li> </ol>
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    1. POPackaging Android resource files within a distributable Jar file
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    1. USJ.J. Kim
    1. USJ.J. Kim
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    1. COhow do I reach to jar's resource file? I mean i made a jar file which has some drawables and layouts, after I added it into the project i could not reach them. I'm using it like this context.getResources().getDrawable(Util.getResourceIdByName("com.mgandronet", "drawable", "alert")); but I know it's not logical because it gets only resources of the passed context. however I need to reach to the resource of the jar file and get the drawable object. How can I do it?
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      1. USMustafa Güven
    2. COAlso if the library ships the layout files, then the pacakge name where the 'R' class has to be the Application's which uses the JAR file right? Even then I am getting noClassDefinitionFound exception
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      1. USManohar
    3. CO@J.J.Kim I used the same implementation. I failed to retrive drawables using the above process. Is there any other method to resolve this ?
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