Disposing on Android 1

Disposing on Android 1.kt

class MyActivity {
    
    var fetchDataDisposable: Disposable? = null
    
    /* ... */

    fun onCreate() {
        super.onCreate()
        /* stuff */
        
        fetchDataDisposable = fetchData()
            .flatMap(::prepareData)
            .subscribe(::displayData)
    } 
    
    fun onDestroy() {
        fetchDataDisposable?.dispose()
    }
}