Clean realm management (close and remove listeners)

app/src/main/java/net/pokeranalytics/android/ui/fragment/DataListFragment.kt

@@ -7,7 +7,6 @@ import android.view.ViewGroup
 import androidx.recyclerview.widget.ItemTouchHelper
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.google.android.material.snackbar.Snackbar
-import io.realm.Realm
 import io.realm.RealmObject
 import io.realm.RealmResults
 import kotlinx.android.synthetic.main.fragment_data_list.*
@@ -159,9 +158,8 @@ class DataListFragment : PokerAnalyticsFragment(), LiveRowRepresentableDataSourc
 	fun setData(dataType: Int) {
 		this.dataType = SettingRow.values()[dataType]
 		this.toolbar.title = this.dataType.localizedTitle(requireContext())
-		val realm = Realm.getDefaultInstance()
 		this.dataType.relatedResultsRepresentable?.let {
-			this.items = it.items(realm)
+			this.items = it.items(getRealm())
 		}
 	}
 }

app/src/main/java/net/pokeranalytics/android/ui/fragment/components/SessionObserverFragment.kt

@@ -1,20 +1,25 @@
 package net.pokeranalytics.android.ui.fragment.components
 
-import io.realm.Realm
+import android.os.Bundle
 import io.realm.RealmResults
 import net.pokeranalytics.android.model.realm.ComputableResult
 
 open class SessionObserverFragment : PokerAnalyticsFragment() {
 
-    val endedSessions: RealmResults<ComputableResult>
+    private lateinit var endedSessions: RealmResults<ComputableResult>
 
-    init {
+	override fun onCreate(savedInstanceState: Bundle?) {
-        val realm = Realm.getDefaultInstance()
+		super.onCreate(savedInstanceState)
-        this.endedSessions = realm.where(ComputableResult::class.java).findAll() // ComputableResult are existing only if sessions are ended
+		this.endedSessions = getRealm().where(ComputableResult::class.java).findAll() // ComputableResult are existing only if sessions are ended
-        this.endedSessions.addChangeListener { _, _ ->
+		this.endedSessions.addChangeListener { _, _ ->
-            this.sessionsChanged()
+			this.sessionsChanged()
-        }
+		}
-    }
+	}
+
+	override fun onDestroyView() {
+		super.onDestroyView()
+		endedSessions.removeAllChangeListeners()
+	}
 
     open fun sessionsChanged() {
         // to override