Use dependency injection for most singletons

hiddenitems/src/main/java/de/mm20/launcher2/hiddenitems/HiddenItemsRepository.kt

@@ -10,20 +10,11 @@ import de.mm20.launcher2.search.data.Searchable
  * A low level repository for hidden items. This can only be used to retrieve keys and to check
  * whether an item is hidden. To retrieve actual Searchable objects, use FavoritesRepository.
  */
-class HiddenItemsRepository private constructor(val context: Context) {
+class HiddenItemsRepository(val context: Context) {
 
     val hiddenItemsKeys : LiveData<List<String>> = AppDatabase.getInstance(context).searchDao().getHiddenItemKeys()
 
     fun isHidden(item: Searchable): LiveData<Boolean> {
         return AppDatabase.getInstance(context).searchDao().isHidden(item.key)
     }
-
-    companion object {
-        private lateinit var instance: HiddenItemsRepository
-
-        fun getInstance(context: Context): HiddenItemsRepository {
-            if(!Companion::instance.isInitialized) instance = HiddenItemsRepository(context.applicationContext)
-            return instance
-        }
-    }
 }

hiddenitems/src/main/java/de/mm20/launcher2/hiddenitems/HiddenItemsViewModel.kt

@@ -1,9 +1,10 @@
 package de.mm20.launcher2.hiddenitems
 
-import android.app.Application
-import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.ViewModel
 
-class HiddenItemsViewModel(app: Application): AndroidViewModel(app) {
-    val hiddenItemsKeys = HiddenItemsRepository.getInstance(app).hiddenItemsKeys
+class HiddenItemsViewModel(
+    hiddenItemsRepository: HiddenItemsRepository
+): ViewModel() {
+    val hiddenItemsKeys = hiddenItemsRepository.hiddenItemsKeys
 
 }

hiddenitems/src/main/java/de/mm20/launcher2/hiddenitems/Module.kt

@@ -0,0 +1,10 @@
+package de.mm20.launcher2.hiddenitems
+
+import org.koin.android.ext.koin.androidContext
+import org.koin.androidx.viewmodel.dsl.viewModel
+import org.koin.dsl.module
+
+val hiddenItemsModule = module {
+    single { HiddenItemsRepository(androidContext()) }
+    viewModel { HiddenItemsViewModel(get()) }
+}