Implement dependency injection using hilt and inject CoroutineDisptacher

AnkiDroid/build.gradle

@@ -8,6 +8,8 @@ apply plugin: 'app.brant.amazonappstorepublisher'
 apply plugin: 'idea'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-parcelize'
+apply plugin: 'kotlin-kapt'
+apply plugin: 'dagger.hilt.android.plugin'
 
 
 repositories {
@@ -315,6 +317,8 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-test:$kotlin_version"
     implementation 'com.github.ByteHamster:SearchPreference:v2.3.0'
     implementation 'com.github.AppIntro:AppIntro:6.2.0'
+    implementation "com.google.dagger:hilt-android:2.43.2"
+    kapt "com.google.dagger:hilt-android-compiler:2.43.2"
 
     // Cannot use debugImplementation since classes need to be imported in AnkiDroidApp
     // and there's no no-op version for release build. Usage has been disabled for release

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

@@ -45,6 +45,7 @@ import com.ichi2.anki.services.NotificationService
 import com.ichi2.compat.CompatHelper
 import com.ichi2.themes.Themes
 import com.ichi2.utils.*
+import dagger.hilt.android.HiltAndroidApp
 import net.ankiweb.rsdroid.BackendFactory
 import timber.log.Timber
 import timber.log.Timber.DebugTree
@@ -55,6 +56,7 @@ import java.util.regex.Pattern
 /**
  * Application class.
  */
+@HiltAndroidApp
 @KotlinCleanup("lots to do")
 @KotlinCleanup("IDE Lint")
 open class AnkiDroidApp : Application() {

AnkiDroid/src/main/java/com/ichi2/anki/di/DispatcherModule.kt

@@ -0,0 +1,55 @@
+/****************************************************************************************
+ *                                                                                      *
+ * Copyright (c) 2022 Shridhar Goel <shridhar.goel@gmail.com>                           *
+ *                                                                                      *
+ * 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.di
+
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
+import javax.inject.Qualifier
+
+@Module
+@InstallIn(SingletonComponent::class)
+object DispatchersModule {
+
+    @DefaultDispatcher
+    @Provides
+    fun providesDefaultDispatcher(): CoroutineDispatcher = Dispatchers.Default
+
+    @IoDispatcher
+    @Provides
+    fun providesIoDispatcher(): CoroutineDispatcher = Dispatchers.IO
+
+    @MainDispatcher
+    @Provides
+    fun providesMainDispatcher(): CoroutineDispatcher = Dispatchers.Main
+}
+
+@Qualifier
+@Retention(AnnotationRetention.BINARY)
+annotation class DefaultDispatcher
+
+@Qualifier
+@Retention(AnnotationRetention.BINARY)
+annotation class IoDispatcher
+
+@Qualifier
+@Retention(AnnotationRetention.BINARY)
+annotation class MainDispatcher

AnkiDroid/src/main/java/com/ichi2/anki/multimediacard/activity/LoadPronunciationActivity.kt

@@ -29,27 +29,29 @@ import android.widget.Button
 import android.widget.LinearLayout
 import android.widget.Spinner
 import android.widget.TextView
-import androidx.annotation.VisibleForTesting
 import androidx.lifecycle.lifecycleScope
 import com.ichi2.anki.AnkiActivity
 import com.ichi2.anki.R
 import com.ichi2.anki.UIUtils.showThemedToast
+import com.ichi2.anki.di.IoDispatcher
+import com.ichi2.anki.di.MainDispatcher
 import com.ichi2.anki.multimediacard.beolingus.parsing.BeolingusParser
 import com.ichi2.anki.multimediacard.language.LanguageListerBeolingus
 import com.ichi2.anki.web.HttpFetcher.downloadFileToSdCard
 import com.ichi2.anki.web.HttpFetcher.fetchThroughHttp
 import com.ichi2.themes.Themes.disableXiaomiForceDarkMode
 import com.ichi2.utils.AdaptionUtil.isUserATestClient
 import com.ichi2.utils.NetworkUtils
+import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineExceptionHandler
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import timber.log.Timber
 import java.io.UnsupportedEncodingException
 import java.net.URLEncoder
+import javax.inject.Inject
 
 /**
  * Activity to load pronunciation files from Beolingus.
@@ -58,7 +60,15 @@ import java.net.URLEncoder
  * <p>
  * When activity finished, it passes the filepath as another extra to the caller.
  */
+@AndroidEntryPoint
 open class LoadPronunciationActivity : AnkiActivity(), DialogInterface.OnCancelListener {
+
+    @Inject
+    @MainDispatcher lateinit var mainDispatcher: CoroutineDispatcher
+
+    @Inject
+    @IoDispatcher lateinit var ioDispatcher: CoroutineDispatcher
+
     private var mStopped = false
     private lateinit var source: String
     private lateinit var mTranslationAddress: String
@@ -345,14 +355,5 @@ open class LoadPronunciationActivity : AnkiActivity(), DialogInterface.OnCancelL
 
         // Passed out as a result
         const val EXTRA_PRONUNCIATION_FILE_PATH = "com.ichi2.anki.LoadPronounciationActivity.extra.pronun.file.path"
-
-        private var ioDispatcher: CoroutineDispatcher = Dispatchers.IO
-        private var mainDispatcher: CoroutineDispatcher = Dispatchers.Main
-
-        @VisibleForTesting
-        fun setTestDispatchers(dispatcher: CoroutineDispatcher) {
-            ioDispatcher = dispatcher
-            mainDispatcher = dispatcher
-        }
     }
 }

build.gradle

@@ -29,6 +29,8 @@ buildscript {
 
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "org.jlleitschuh.gradle:ktlint-gradle:11.0.0"
+
+        classpath "com.google.dagger:hilt-android-gradle-plugin:2.43.2"
     }
 }