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PODownlaod drawables from server to reduce APK file size
 

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    <p>To reduce the APK file size, I want to remove the drawables (images and XML files) from my project and download the proper ones from my server on the first app start.</p> <p>The problem is how to load and use the downloaded drawables in my code?</p> <p>This is what I found after some research:</p> <ul> <li>For normal images, I can use <a href="https://stackoverflow.com/questions/3375166/android-drawable-images-from-url"><code>BitmapDrawable</code></a>.</li> <li>For 9-patch images, I can use <a href="https://stackoverflow.com/questions/9284784/android-how-to-create-a-9patch-image-from-an-inputstream"><code>NinePatchDrawable</code></a>.</li> </ul> <p>But I still don't know how to load and use XML drawables that have references to other drawables, like this:</p> <pre><code>&lt;layer-list&gt; &lt;item&gt; &lt;bitmap android:src="@drawable/other_drawable" /&gt; &lt;/item&gt; &lt;/layer-list&gt; </code></pre> <p>Any thoughts on this or other effective ideas to reduce the APK file size would be appreciated.</p> <p><em>Notes:</em></p> <ul> <li>The drawables make up most of the APK file size (20mb/25mb).</li> <li>I already compressed image files and I'm using ProGuard.</li> </ul> <hr> <p><strong>Update:</strong></p> <p>After some more research, it seems to me possible to load/use downloaded XML drawables after modifying them a little by using custom attributes for referenced drawables and a subclass of <code>Drawable</code> instead of native <code>BitmapDrawable</code>. So the above XML drawable example will become something like this:</p> <pre><code>&lt;layer-list xmlns:custom="http://schemas.android.com/apk/res-auto"&gt; &lt;item&gt; &lt;custom-bitmap custom:ref="other_drawable" /&gt; &lt;/item&gt; &lt;/layer-list&gt; </code></pre> <p>Though, it's not a very easy solution and I'm not sure it's better than doing things manually.</p> <p>References:</p> <ul> <li><a href="https://groups.google.com/forum/#!topic/android-developers/glpdi0AdMzI" rel="nofollow noreferrer">https://groups.google.com/forum/#!topic/android-developers/glpdi0AdMzI</a></li> <li><a href="https://code.google.com/p/adet/source/browse/trunk/AdetSample/res/drawable/svg_button.xml" rel="nofollow noreferrer">https://code.google.com/p/adet/source/browse/trunk/AdetSample/res/drawable/svg_button.xml</a></li> </ul>
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