title: ionic 3.9 localnotification and androidx
body: <p>in order to use a new plugin, I had to update my cordova version to 9.0.0, and I also updated my android version to 28. 
  My problem is now I can't compile my project because of the cordova plugin "localnotification" (<a href="https://github.com/katzer/cordova-plugin-local-notifications" rel="nofollow noreferrer">https://github.com/katzer/cordova-plugin-local-notifications</a>). </p>
  
  <p>I have a bunch of errors (maybe 150/200) related to android support library v4, like :  </p>
  
  <pre><code>error: package android.support.v4.content does not exist
  or
  cannot find symbol public class AssetProvider extends FileProvider {
                                                        ^
  </code></pre>
  
  <p>Because I updgraded android, I had to migrate to androidX too. I did it by adding this in <code>gradle.properties</code>  : </p>
  
  <pre><code>android.enableJetifier=true
  android.useAndroidX=true
  </code></pre>
  
  <p>But now I'm unable to compile my app without all these errors above. I found something saying that we should add these lines in the <code>.gradle</code> of the plugin : </p>
  
  <pre><code>implementation 'com.android.support:appcompat-v7:28.0.0' 
  implementation 'com.android.support:support-v4:28.0.0'
  </code></pre>
  
  <p>I did it without success.
  Any other ideas ?</p>
  
  <p>Thanks in advance !</p>