title: Kotlin error while referencing Activity from Inner Class
body: <p>I have an AsyncTask as an inner class inside my Activity written in Kotlin. Now, I tried to access the Activity from my AsyncTask's onPostExecute using <code>this@MyActivity</code> but Android Studio reports it as Unresolved Reference error. But this is the most common method suggested online for referencing the OuterClass from an InnerClass. The code is as follows: </p>
  
  <pre><code>class MyActivity : AbstractAppPauseActivity() {
  
  override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
  }
  
  override fun onResume() {
      super.onResume()
  }
  
  class MyTask(private var mContext: Context?, val pbMigrating: ProgressBar) :AsyncTask&lt;Void, Int, Void&gt;() {
  
  
      private var size: Long = 0
  
      override fun onPreExecute() {
          super.onPreExecute()
          ...
  
      }
  
      override fun doInBackground(vararg params: Void?): Void? {
          ...
          return null
      }
  
      override fun onProgressUpdate(vararg values: Int?) {
          super.onProgressUpdate(*values)
          pbMigrating.progress = values[0] as Int
  
      }
  
      override fun onPostExecute(result: Void?) {
          super.onPostExecute(result)
          this@MyActivity //&lt;- Cannot Resolve error here 
      }
  
  
  }
  
  }
  </code></pre>