Example of passing data using Interface in Android (Kotlin)

FileToGetDataIn.kt

class FileToGetDataIn extends Activity,  cat{
  
  lateinit var mahInterface: cat;
  
  override fun onCreate() {
    
    // Pass as intentt
    FileToPassDataFrom().apply(this.setCatInterface(this@FileToPassDataFrom)
    
  }
  
  // Will receive data here                             
  override fun giveName(name: String) {
    
    print("Cat's name is $name")
    
  }
  
}

FileToPassDataFrom.kt

class FileToPassDataFrom extends Activity {
  
  // will be inittialised when starting the activity from the source activit/fragment
  lateinit var catInterface: cat;
  
  override fun onCreate() {
    
    // invoke interface and pass the data
    catInterface.giveName("Champa")
    
  }
  
  // This fucntion will set the interface from the source activit/fragment
  fun setCatInterface(catInterface: cat) {
    [email protected] = catInterface
  }
  
  // Interface declaration
  Interface cat{
    giveName(name: String)
  }
  
}