title: Using external library in an Android Module (Library)
body: <p>I'm working on an android library where I need to download image from online and cache them. So, I wanna use <strong>picassa</strong> to do this task.
  But when I'm using any external library application got crashed and showing that </p>
  
  <blockquote>
    <p>Class Not fount exception</p>
  </blockquote>
  
  <p>.</p>
  
  <p>Here the Logcat file .</p>
  
  <pre><code>Caused by: java.lang.ClassNotFoundException: Didn't find class "com.squareup.picasso.Picasso" on path: DexPathList[[zip file "/data/app/com.application.thecodero.amarbill-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
  </code></pre>
  
  <p>and Error is showing here.</p>
  
  <pre><code>Picasso.with(Easypayway.this).load(imageUrl).into(mainLogo);
  </code></pre>
  
  <p>This error only showing only when I use the .arr file. But when I'm using the module (main lib file) it's not showing. </p>
  
  <p>What's the problem here ?</p>