FilterProvider: Inject and manage instances using hilt

This also switchers to default gson instance without any modifier
changes fixing issues happening with missing params.

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/src/main/java/com/aurora/store/data/providers/FilterProvider.kt

@@ -21,30 +21,28 @@ package com.aurora.store.data.providers
 
 import android.content.Context
 import com.aurora.store.data.Filter
-import com.aurora.store.data.SingletonHolder
 import com.aurora.store.util.Preferences
 import com.google.gson.Gson
-import com.google.gson.GsonBuilder
-import java.lang.reflect.Modifier
+import dagger.hilt.android.qualifiers.ApplicationContext
+import javax.inject.Inject
+import javax.inject.Singleton
 
-class FilterProvider private constructor(var context: Context) {
+@Singleton
+class FilterProvider @Inject constructor(
+    private val gson: Gson,
+    @ApplicationContext private val context: Context
+) {
 
-    companion object : SingletonHolder<FilterProvider, Context>(::FilterProvider) {
+    companion object {
         const val PREFERENCE_FILTER = "PREFERENCE_FILTER"
     }
 
-    private var gson: Gson = GsonBuilder()
-        .excludeFieldsWithModifiers(Modifier.TRANSIENT)
-        .create()
-
     fun getSavedFilter(): Filter {
-        var rawFilter = Preferences.getString(context, PREFERENCE_FILTER)
-        if (rawFilter.isEmpty())
-            rawFilter = "{}"
-        return gson.fromJson(rawFilter, Filter::class.java)
+        val rawFilter = Preferences.getString(context, PREFERENCE_FILTER)
+        return gson.fromJson(rawFilter.ifEmpty { "{}" }, Filter::class.java)
     }
 
     fun saveFilter(filter: Filter) {
         Preferences.putString(context, PREFERENCE_FILTER, gson.toJson(filter))
     }
-}
+}

app/src/main/java/com/aurora/store/view/ui/search/SearchResultsFragment.kt

@@ -34,7 +34,7 @@ import com.aurora.gplayapi.data.models.App
 import com.aurora.gplayapi.data.models.SearchBundle
 import com.aurora.store.R
 import com.aurora.store.data.Filter
-import com.aurora.store.data.providers.FilterProvider
+import com.aurora.store.data.providers.FilterProvider.Companion.PREFERENCE_FILTER
 import com.aurora.store.databinding.FragmentSearchResultBinding
 import com.aurora.store.util.Preferences
 import com.aurora.store.view.custom.recycler.EndlessRecyclerOnScrollListener
@@ -60,7 +60,6 @@ class SearchResultsFragment : BaseFragment(R.layout.fragment_search_result),
     private lateinit var searchView: TextInputEditText
 
     private lateinit var sharedPreferences: SharedPreferences
-    private lateinit var filter: Filter
 
     private var query: String? = null
     private var searchBundle: SearchBundle = SearchBundle()
@@ -74,7 +73,6 @@ class SearchResultsFragment : BaseFragment(R.layout.fragment_search_result),
 
         sharedPreferences = Preferences.getPrefs(view.context)
         sharedPreferences.registerOnSharedPreferenceChangeListener(this)
-        filter = FilterProvider.with(view.context).getSavedFilter()
 
         // Toolbar
         binding.layoutViewToolbar.apply {
@@ -121,7 +119,7 @@ class SearchResultsFragment : BaseFragment(R.layout.fragment_search_result),
         context?.let {
             sharedPreferences.unregisterOnSharedPreferenceChangeListener(this)
             if (Preferences.getBoolean(it, Preferences.PREFERENCE_FILTER_SEARCH)) {
-                FilterProvider.with(it).saveFilter(Filter())
+                viewModel.filterProvider.saveFilter(Filter())
             }
         }
         super.onDestroyView()
@@ -242,7 +240,7 @@ class SearchResultsFragment : BaseFragment(R.layout.fragment_search_result),
         val tempList:MutableList<App> = mutableListOf()
         tempList.addAll(appList)
 
-        filter = FilterProvider.with(requireContext()).getSavedFilter()
+        val filter = viewModel.filterProvider.getSavedFilter()
         return tempList
             .asSequence()
             .filter { it.displayName.isNotEmpty() } // Some of the apps may not have metadata
@@ -255,11 +253,6 @@ class SearchResultsFragment : BaseFragment(R.layout.fragment_search_result),
     }
 
     override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?, key: String?) {
-        if (key == FilterProvider.PREFERENCE_FILTER) {
-            filter = FilterProvider.with(requireContext()).getSavedFilter()
-            query?.let {
-                queryViewModel(it)
-            }
-        }
+        if (key == PREFERENCE_FILTER) query?.let { queryViewModel(it) }
     }
 }

app/src/main/java/com/aurora/store/view/ui/sheets/FilterSheet.kt

@@ -28,6 +28,7 @@ import com.aurora.store.databinding.SheetFilterBinding
 import com.google.android.material.bottomsheet.BottomSheetDialogFragment
 import com.google.android.material.chip.Chip
 import dagger.hilt.android.AndroidEntryPoint
+import javax.inject.Inject
 
 @AndroidEntryPoint
 class FilterSheet : BottomSheetDialogFragment(R.layout.sheet_filter) {
@@ -35,12 +36,15 @@ class FilterSheet : BottomSheetDialogFragment(R.layout.sheet_filter) {
     private var _binding: SheetFilterBinding? = null
     private val binding get() = _binding!!
 
+    @Inject
+    lateinit var filterProvider: FilterProvider
+
     private lateinit var filter: Filter
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         _binding = SheetFilterBinding.bind(view)
-        filter = FilterProvider.with(requireContext()).getSavedFilter()
+        filter = filterProvider.getSavedFilter()
 
         attachSingleChips()
         attachMultipleChips()
@@ -54,7 +58,7 @@ class FilterSheet : BottomSheetDialogFragment(R.layout.sheet_filter) {
 
     private fun attachActions() {
         binding.btnPositive.setOnClickListener {
-            FilterProvider.with(requireContext()).saveFilter(filter)
+            filterProvider.saveFilter(filter)
             dismissAllowingStateLoss()
         }
 

app/src/main/java/com/aurora/store/viewmodel/search/SearchResultViewModel.kt

@@ -32,6 +32,7 @@ import com.aurora.gplayapi.helpers.SearchHelper
 import com.aurora.gplayapi.helpers.WebSearchHelper
 import com.aurora.store.data.network.HttpClient
 import com.aurora.store.data.providers.AuthProvider
+import com.aurora.store.data.providers.FilterProvider
 import dagger.hilt.android.lifecycle.HiltViewModel
 import dagger.hilt.android.qualifiers.ApplicationContext
 import javax.inject.Inject
@@ -42,6 +43,7 @@ import kotlinx.coroutines.supervisorScope
 @HiltViewModel
 @SuppressLint("StaticFieldLeak") // false positive, see https://github.com/google/dagger/issues/3253
 class SearchResultViewModel @Inject constructor(
+    val filterProvider: FilterProvider,
     @ApplicationContext private val context: Context
 ) : ViewModel() {