Fixing MainThreadInitializedObject

> Making SafeCloseable implementation mandatory, to prevent leaks during test and preview
> Removing getNoCreate method and defining executeIfCreated to avoid null pointer exceptions
> Fixing sandbox value leaking into main, by Checking sandbox against App context
> Converting sanbox to an interface instead a class

Bug: 335280439
Test: Presubmit
Flag: None
Change-Id: I951dcde871898e745ff6490a1c4f8fd1512888f5
diff --git a/src/com/android/launcher3/LauncherPrefs.kt b/src/com/android/launcher3/LauncherPrefs.kt
index 80a8cea..b503739 100644
--- a/src/com/android/launcher3/LauncherPrefs.kt
+++ b/src/com/android/launcher3/LauncherPrefs.kt
@@ -30,6 +30,7 @@
 import com.android.launcher3.states.RotationHelper
 import com.android.launcher3.util.DisplayController
 import com.android.launcher3.util.MainThreadInitializedObject
+import com.android.launcher3.util.SafeCloseable
 import com.android.launcher3.util.Themes
 
 /**
@@ -37,7 +38,7 @@
  *
  * TODO(b/262721340): Replace all direct SharedPreference refs with LauncherPrefs / Item methods.
  */
-class LauncherPrefs(private val encryptedContext: Context) {
+class LauncherPrefs(private val encryptedContext: Context) : SafeCloseable {
     private val deviceProtectedStorageContext =
         encryptedContext.createDeviceProtectedStorageContext()
 
@@ -242,6 +243,8 @@
         }
     }
 
+    override fun close() {}
+
     companion object {
         @VisibleForTesting const val BOOT_AWARE_PREFS_KEY = "boot_aware_prefs"