Implemented Work Manager

AnkiDroid/build.gradle

@@ -331,5 +331,8 @@ dependencies {
 
     // GSON
     implementation 'com.google.code.gson:gson:2.9.0'
+
+    // Work Manager
+    implementation "androidx.work:work-runtime-ktx:2.7.1"
 }
 apply from: "./kotlinMigration.gradle"

AnkiDroid/src/main/AndroidManifest.xml

@@ -377,11 +377,6 @@
 
         <!-- Service to perform web API queries -->
         <service android:name="com.ichi2.widget.AnkiDroidWidgetSmall$UpdateService" />
-        <service
-            android:enabled="true"
-            android:name=".services.DeckMetaDataService"
-            android:exported="false"/>
-
 
         <!-- small widget -->
         <receiver
@@ -496,6 +491,18 @@
                 android:name="android.support.FILE_PROVIDER_PATHS"
                 android:resource="@xml/filepaths" />
         </provider>
+
+        <!-- Disabled the Initialization at startup. Using custom work manager Initialization-->
+        <provider
+            android:name="androidx.startup.InitializationProvider"
+            android:authorities="${applicationId}.androidx-startup"
+            android:exported="false"
+            tools:node="merge">
+            <meta-data
+                android:name="androidx.work.WorkManagerInitializer"
+                android:value="androidx.startup"
+                tools:node="remove" />
+        </provider>
     </application>
 
 </manifest>

AnkiDroid/src/main/java/com/ichi2/anki/AnkiDroidApp.java

@@ -43,6 +43,7 @@
 import com.ichi2.anki.exception.StorageAccessException;
 import com.ichi2.anki.services.BootService;
 import com.ichi2.anki.services.NotificationService;
+import com.ichi2.anki.worker.DeckMetaDataWorker;
 import com.ichi2.compat.CompatHelper;
 import com.ichi2.utils.AdaptionUtil;
 import com.ichi2.utils.ExceptionUtil;
@@ -52,9 +53,13 @@
 
 import java.io.InputStream;
 import java.util.Locale;
+import java.util.concurrent.TimeUnit;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+import androidx.work.ExistingPeriodicWorkPolicy;
+import androidx.work.PeriodicWorkRequest;
+import androidx.work.WorkManager;
 import timber.log.Timber;
 
 import static com.ichi2.anki.CrashReportService.sendExceptionReport;
@@ -63,7 +68,7 @@
 /**
  * Application class.
  */
-public class AnkiDroidApp extends Application {
+public class AnkiDroidApp extends Application implements androidx.work.Configuration.Provider {
 
     /** Running under instrumentation. a "/androidTest" directory will be created which contains a test collection */
     public static boolean INSTRUMENTATION_TESTING = false;
@@ -226,6 +231,9 @@ public void onCreate() {
         Timber.i("AnkiDroidApp: Starting Services");
         new BootService().onReceive(this, new Intent(this, BootService.class));
 
+        Timber.i("AnkiDroidApp: Starting Workers");
+        setupDeckMetaDataWorker();
+
         // Register BroadcastReceiver NotificationService
         NotificationService ns = new NotificationService();
         LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(this);
@@ -411,6 +419,36 @@ public static String getWebViewErrorMessage() {
         return ExceptionUtil.getExceptionMessage(error);
     }
 
+    /**
+     * This function setups the work manager which run periodically.
+     **/
+    private void setupDeckMetaDataWorker() {
+        Timber.tag("META").e("Setting up deck meta data worker...");
+
+        PeriodicWorkRequest deckMetaDataWorker = new PeriodicWorkRequest.Builder(DeckMetaDataWorker.class, 2, TimeUnit.MINUTES)
+                .addTag(DeckMetaDataWorker.DECK_META_WORKER)
+                .build();
+
+        WorkManager.getInstance(this)
+                .enqueueUniquePeriodicWork(
+                        DeckMetaDataWorker.DECK_META_WORKER,
+                        ExistingPeriodicWorkPolicy.REPLACE,
+                        deckMetaDataWorker
+                );
+    }
+
+
+    /**
+     * This Method sets the Work Manager Configuration. We are using Custom work manager Initialization.
+     * */
+    @NonNull
+    @Override
+    public androidx.work.Configuration getWorkManagerConfiguration() {
+        return new androidx.work.Configuration.Builder()
+                .setMinimumLoggingLevel(android.util.Log.INFO)
+                .build();
+    }
+
     /**
      * A tree which logs necessary data for crash reporting.
      *

AnkiDroid/src/main/java/com/ichi2/anki/DeckMetaDataPreference.kt

@@ -1,9 +1,25 @@
+/*
+ * Copyright (c) 2022 Prateek Singh <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 package com.ichi2.anki
 
 import android.content.Context
 import android.content.SharedPreferences
 import com.google.gson.Gson
-import com.ichi2.anki.services.DeckMetaDataService
+import com.ichi2.anki.worker.DeckMetaDataWorker
 import timber.log.Timber
 
 class DeckMetaDataPreference(context: Context) {
@@ -21,22 +37,22 @@ class DeckMetaDataPreference(context: Context) {
         return sharedPreferences.getString(key, default)!!
     }
 
-    fun setMetaData(key: String, value: DeckMetaDataService.Meta) {
+    fun setMetaData(key: String, value: DeckMetaDataWorker.Meta) {
         val json: String = Gson().toJson(value)
         sharedPreferences.edit()
             .putString(key, json)
             .apply()
         Timber.tag("META").e(json)
     }
 
-    fun getMetaData(key: String): DeckMetaDataService.Meta? {
+    fun getMetaData(key: String): DeckMetaDataWorker.Meta? {
         val jsonData = sharedPreferences
             .getString(key, null)
 
         return if (jsonData == null) {
             null
         } else {
-            Gson().fromJson(jsonData, DeckMetaDataService.Meta::class.java)
+            Gson().fromJson(jsonData, DeckMetaDataWorker.Meta::class.java)
         }
     }
 }

AnkiDroid/src/main/java/com/ichi2/anki/IntentHandler.kt

@@ -27,7 +27,6 @@ import com.ichi2.anki.UIUtils.showThemedToast
 import com.ichi2.anki.dialogs.DialogHandler
 import com.ichi2.anki.dialogs.DialogHandler.Companion.storeMessage
 import com.ichi2.anki.servicelayer.ScopedStorageService
-import com.ichi2.anki.services.DeckMetaDataService
 import com.ichi2.anki.services.ReminderService
 import com.ichi2.themes.Themes.disableXiaomiForceDarkMode
 import com.ichi2.utils.ImportUtils.handleFileImport
@@ -49,7 +48,6 @@ class IntentHandler : Activity() {
         Timber.d("onCreate()")
         super.onCreate(savedInstanceState)
         disableXiaomiForceDarkMode(this)
-        launchDeckMetaDataService()
         setContentView(R.layout.progress_bar)
         val intent = intent
         Timber.v(intent.toString())
@@ -138,16 +136,6 @@ class IntentHandler : Activity() {
         finish()
     }
 
-    private fun launchDeckMetaDataService() {
-        Timber.tag("META").e("Launching deck meta data service...")
-        val intent = Intent(this, DeckMetaDataService::class.java)
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-            startForegroundService(intent)
-        } else {
-            startService(intent)
-        }
-    }
-
     // COULD_BE_BETTER: Also extract the parameters into here to reduce coupling
     @VisibleForTesting
     enum class LaunchType {