display current cache size in settings

app/build.gradle

@@ -246,7 +246,10 @@ dependencies {
     implementation "androidx.room:room-runtime:$room_version"
     kapt "androidx.room:room-compiler:$room_version"
     implementation "androidx.room:room-ktx:$room_version"
-    implementation 'com.github.anboralabs:spatia-room:0.2.6'
+    implementation('com.github.anboralabs:spatia-room:0.2.6') {
+        exclude group: 'com.github.dalgarins', module: 'android-spatialite'
+    }
+    implementation 'com.github.ev-map:android-spatialite:654dca2365'
 
     // billing library
     def billing_version = "6.0.0"

app/src/main/java/net/vonforst/evmap/fragment/preference/DataSettingsFragment.kt

@@ -41,8 +41,23 @@ class DataSettingsFragment : BaseSettingsFragment() {
 
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         setPreferencesFromResource(R.xml.settings_data, rootKey)
-        teslaAccountPreference = findPreference<Preference>("tesla_account")!!
+        teslaAccountPreference = findPreference("tesla_account")!!
         refreshTeslaAccountStatus()
+
+        vm.chargerCacheCount.observe(this) {
+            updateCacheSizeSummary()
+        }
+        vm.chargerCacheSize.observe(this) {
+            updateCacheSizeSummary()
+        }
+    }
+
+    private fun updateCacheSizeSummary() {
+        val count = vm.chargerCacheCount.value ?: return
+        val size = vm.chargerCacheSize.value ?: return
+        val sizeMb = size.toFloat() / 1024 / 1024
+        findPreference<Preference>("cache_size")!!.summary =
+            getString(R.string.settings_cache_count_summary, count, sizeMb)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
@@ -114,6 +129,11 @@ class DataSettingsFragment : BaseSettingsFragment() {
                 true
             }
 
+            "cache_clear" -> {
+                vm.clearChargerCache()
+                true
+            }
+
             else -> super.onPreferenceTreeClick(preference)
         }
     }

app/src/main/java/net/vonforst/evmap/storage/ChargeLocationsDao.kt

@@ -53,6 +53,9 @@ abstract class ChargeLocationsDao {
     @Query("DELETE FROM chargelocation WHERE dataSource == :dataSource AND timeRetrieved <= :before AND NOT EXISTS (SELECT 1 FROM favorite WHERE favorite.chargerId = chargelocation.id)")
     abstract suspend fun deleteOutdatedIfNotFavorite(dataSource: String, before: Long)
 
+    @Query("DELETE FROM chargelocation WHERE NOT EXISTS (SELECT 1 FROM favorite WHERE favorite.chargerId = chargelocation.id)")
+    abstract suspend fun deleteAllIfNotFavorite()
+
     @Query("SELECT * FROM chargelocation WHERE dataSource == :dataSource AND id == :id AND isDetailed == 1 AND timeRetrieved > :after")
     abstract fun getChargeLocationById(
         id: Long,
@@ -83,6 +86,13 @@ abstract class ChargeLocationsDao {
 
     @RawQuery(observedEntities = [ChargeLocation::class])
     abstract fun getChargeLocationsCustom(query: SupportSQLiteQuery): LiveData<List<ChargeLocation>>
+
+    @Query("SELECT COUNT(*) FROM chargelocation")
+    abstract fun getCount(): LiveData<Long>
+
+    @SkipQueryVerification
+    @Query("SELECT SUM(pgsize) FROM dbstat WHERE name == \"ChargeLocation\"")
+    abstract suspend fun getSize(): Long
 }
 
 /**

app/src/main/java/net/vonforst/evmap/storage/SavedRegionDao.kt

@@ -97,6 +97,9 @@ abstract class SavedRegionDao {
     @Query("DELETE FROM savedregion WHERE dataSource == :dataSource AND timeRetrieved <= :before")
     abstract suspend fun deleteOutdated(dataSource: String, before: Long)
 
+    @Query("DELETE FROM savedregion")
+    abstract suspend fun deleteAll()
+
     @SkipQueryVerification
     @Query("SELECT MakeEllipse(:lng, :lat, :radiusLng, :radiusLat, 4326)")
     protected abstract suspend fun makeEllipse(

app/src/main/java/net/vonforst/evmap/viewmodel/SettingsViewModel.kt

@@ -2,6 +2,7 @@ package net.vonforst.evmap.viewmodel
 
 import android.app.Application
 import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.launch
@@ -9,6 +10,7 @@ import net.vonforst.evmap.api.chargeprice.ChargepriceApi
 import net.vonforst.evmap.api.chargeprice.ChargepriceCar
 import net.vonforst.evmap.api.chargeprice.ChargepriceTariff
 import net.vonforst.evmap.storage.AppDatabase
+import net.vonforst.evmap.storage.PreferenceDataSource
 import java.io.IOException
 
 class SettingsViewModel(
@@ -17,8 +19,9 @@ class SettingsViewModel(
     chargepriceApiUrl: String
 ) :
     AndroidViewModel(application) {
-    private var api = ChargepriceApi.create(chargepriceApiKey, chargepriceApiUrl)
-    private var db = AppDatabase.getInstance(application)
+    private val api = ChargepriceApi.create(chargepriceApiKey, chargepriceApiUrl)
+    private val db = AppDatabase.getInstance(application)
+    private val prefs = PreferenceDataSource(application)
 
     val vehicles: MutableLiveData<Resource<List<ChargepriceCar>>> by lazy {
         MutableLiveData<Resource<List<ChargepriceCar>>>().apply {
@@ -34,6 +37,20 @@ class SettingsViewModel(
         }
     }
 
+    val chargerCacheCount: LiveData<Long> by lazy {
+        db.chargeLocationsDao().getCount()
+    }
+
+    val chargerCacheSize: LiveData<Long> by lazy {
+        MutableLiveData<Long>().apply {
+            chargerCacheCount.observeForever {
+                viewModelScope.launch {
+                    value = db.chargeLocationsDao().getSize()
+                }
+            }
+        }
+    }
+
     private fun loadVehicles() {
         viewModelScope.launch {
             try {
@@ -61,4 +78,11 @@ class SettingsViewModel(
             db.recentAutocompletePlaceDao().deleteAll()
         }
     }
+
+    fun clearChargerCache() {
+        viewModelScope.launch {
+            db.savedRegionDao().deleteAll()
+            db.chargeLocationsDao().deleteAllIfNotFavorite()
+        }
+    }
 }

app/src/main/res/values-de/strings.xml

@@ -320,4 +320,9 @@
     <string name="pref_map_scale_miles">Meilen</string>
     <string name="pref_map_scale_off">aus</string>
     <string name="data_retrieved_at">Daten abgerufen %s</string>
+    <string name="settings_caching">Cache</string>
+    <string name="settings_cache_count">Cache-Größe</string>
+    <string name="settings_cache_clear">Cache leeren</string>
+    <string name="settings_cache_clear_summary">Löscht alle gespeicherten Ladestationen außer Favoriten</string>
+    <string name="settings_cache_count_summary">%d Ladestationen gespeichert, %.1f MB</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -320,4 +320,9 @@
     <string name="pref_map_scale_miles">miles</string>
     <string name="pref_map_scale_off">off</string>
     <string name="data_retrieved_at">Data retrieved %s</string>
+    <string name="settings_caching">Caching</string>
+    <string name="settings_cache_count">Cache size</string>
+    <string name="settings_cache_clear">Clear cache</string>
+    <string name="settings_cache_clear_summary">Deletes all cached chargers except favorites</string>
+    <string name="settings_cache_count_summary">%d chargers cached, %.1f MB</string>
 </resources>

app/src/main/res/xml/settings_data.xml

@@ -43,4 +43,13 @@
             android:title="@string/pref_search_delete_recent" />
 
     </PreferenceCategory>
+    <PreferenceCategory android:title="@string/settings_caching">
+        <Preference
+            android:key="cache_size"
+            android:title="@string/settings_cache_count" />
+        <Preference
+            android:key="cache_clear"
+            android:title="@string/settings_cache_clear"
+            android:summary="@string/settings_cache_clear_summary" />
+    </PreferenceCategory>
 </PreferenceScreen>