title: Add local .aar files to Titanium SDK 9 Android module
body: <p>I'm creating an Android module using Titanium SDK 9. I have 2 .aar files that I need to include in my module. According to the documentation you cannot add them to the <code>lib</code> directory anymore:</p>
  <p>&quot;With Titanium 6.1.1 - 8.3.1, you can also copy AAR (Android Archive) library files to the module's lib directory. However, this is not supported as of Titanium 9.0.0, which requires you to reference these AAR libraries via a build.gradle file instead.&quot;</p>
  <p>But how do I reference them correctly? The below configuration of my build.gradle file compiles, but when I use the module, I see and error like 'Failed resolution of: Lpolar/com/sdk/api/PolarBleApiDefaultImpl' immediately when I use some of the .aar files classes:</p>
  <pre><code>implementation files('../../libs/polar-ble-sdk.aar')
  implementation files('../../libs/polar-protobuf-release.aar')
  // Below 2 lines also compile
  // compile files('../../libs/polar-ble-sdk.aar')
  // compile files('../../libs/polar-protobuf-release.aar')
  implementation group: 'commons-io', name: 'commons-io', version: '2.4'
  implementation 'com.google.protobuf:protobuf-java:3.1.0'
  implementation 'io.reactivex.rxjava2:rxjava:2.1.5'
  implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
  </code></pre>
  <p>The call I'm trying to do in my Titanium project and causes the error:</p>
  <pre><code>import polar.com.sdk.api.PolarBleApi;
  import polar.com.sdk.api.PolarBleApiDefaultImpl;
  
  // and then later on
  
  PolarBleApi api = PolarBleApiDefaultImpl.defaultImplementation(this, 
  PolarBleApi.FEATURE_HR);
  </code></pre>