Avoid unnecessary coroutine context switch

app/src/main/java/com/hippo/ehviewer/EhApplication.kt

@@ -58,12 +58,10 @@ import com.hippo.yorozuya.FileUtils
 import com.hippo.yorozuya.IntIdGenerator
 import eu.kanade.tachiyomi.core.preference.AndroidPreferenceStore
 import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
+import eu.kanade.tachiyomi.util.lang.launchIO
 import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.GlobalScope
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
 import okhttp3.Cache
 import okhttp3.HttpUrl.Companion.toHttpUrl
 import okhttp3.OkHttpClient
@@ -118,36 +116,34 @@ class EhApplication : SceneApplication(), DefaultLifecycleObserver, ImageLoaderF
 
         AppCompatDelegate.setDefaultNightMode(Settings.getTheme())
 
-        GlobalScope.launch {
-            withContext(Dispatchers.IO) {
-                try {
-                    val downloadLocation = Settings.getDownloadLocation()
-                    if (Settings.getMediaScan()) {
-                        CommonOperations.removeNoMediaFile(downloadLocation)
-                    } else {
-                        CommonOperations.ensureNoMediaFile(downloadLocation)
-                    }
-                } catch (t: Throwable) {
-                    t.printStackTrace()
-                    ExceptionUtils.throwIfFatal(t)
+        launchIO {
+            try {
+                val downloadLocation = Settings.getDownloadLocation()
+                if (Settings.getMediaScan()) {
+                    CommonOperations.removeNoMediaFile(downloadLocation)
+                } else {
+                    CommonOperations.ensureNoMediaFile(downloadLocation)
                 }
+            } catch (t: Throwable) {
+                t.printStackTrace()
+                ExceptionUtils.throwIfFatal(t)
+            }
 
-                // Clear temp files
-                try {
-                    clearTempDir()
-                } catch (t: Throwable) {
-                    t.printStackTrace()
-                    ExceptionUtils.throwIfFatal(t)
-                }
+            // Clear temp files
+            try {
+                clearTempDir()
+            } catch (t: Throwable) {
+                t.printStackTrace()
+                ExceptionUtils.throwIfFatal(t)
             }
         }
-        GlobalScope.launch {
+        launchIO {
             theDawnOfNewDay()
         }
         mIdGenerator.setNextId(Settings.getInt(KEY_GLOBAL_STUFF_NEXT_ID, 0))
     }
 
-    private suspend fun theDawnOfNewDay() {
+    private fun theDawnOfNewDay() {
         if (!Settings.getRequestNews()) {
             return
         }
@@ -159,22 +155,20 @@ class EhApplication : SceneApplication(), DefaultLifecycleObserver, ImageLoaderF
                 EhCookieStore.KEY_IPD_PASS_HASH
             )
         ) {
-            withContext(Dispatchers.IO) {
-                val referer = EhUrl.REFERER_E
-                val request = EhRequestBuilder(EhUrl.HOST_E + "news.php", referer).build()
-                val call = okHttpClient.newCall(request)
-                try {
-                    call.execute().use { response ->
-                        val responseBody = response.body
-                        val body = responseBody.string()
-                        val html = EventPaneParser.parse(body)
-                        if (html != null) {
-                            showEventPane(html)
-                        }
+            val referer = EhUrl.REFERER_E
+            val request = EhRequestBuilder(EhUrl.HOST_E + "news.php", referer).build()
+            val call = okHttpClient.newCall(request)
+            try {
+                call.execute().use { response ->
+                    val responseBody = response.body
+                    val body = responseBody.string()
+                    val html = EventPaneParser.parse(body)
+                    if (html != null) {
+                        showEventPane(html)
                     }
-                } catch (e: Throwable) {
-                    e.printStackTrace()
                 }
+            } catch (e: Throwable) {
+                e.printStackTrace()
             }
         }
     }

app/src/main/java/com/hippo/ehviewer/client/EhTagDatabase.kt

@@ -24,12 +24,10 @@ import com.hippo.util.ExceptionUtils
 import com.hippo.util.HashCodeUtils
 import com.hippo.yorozuya.FileUtils
 import com.hippo.yorozuya.IOUtils
+import eu.kanade.tachiyomi.util.lang.launchIO
 import kotlinx.coroutines.DelicateCoroutinesApi
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flow
-import kotlinx.coroutines.launch
 import okhttp3.OkHttpClient
 import okhttp3.Request
 import okio.BufferedSource
@@ -193,7 +191,7 @@ object EhTagDatabase {
     @OptIn(DelicateCoroutinesApi::class)
     @JvmStatic
     fun update() {
-        GlobalScope.launch(Dispatchers.IO) {
+        launchIO {
             updateInternal()
         }
     }

app/src/main/java/com/hippo/ehviewer/ui/scene/SearchBarScene.kt

@@ -27,11 +27,10 @@ import com.hippo.ehviewer.Settings
 import com.hippo.ehviewer.client.EhTagDatabase
 import com.hippo.ehviewer.widget.SearchDatabase
 import com.hippo.scene.StageActivity
-import kotlinx.coroutines.Dispatchers
+import eu.kanade.tachiyomi.util.lang.withUIContext
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
 
 
 abstract class SearchBarScene : ToolbarScene() {
@@ -311,12 +310,12 @@ abstract class SearchBarScene : ToolbarScene() {
 
     @SuppressLint("NotifyDataSetChanged")
     private fun updateSuggestions(scrollToTop: Boolean = true) {
-        viewLifecycleOwner.lifecycleScope.launch(Dispatchers.Default) {
+        viewLifecycleOwner.lifecycleScope.launch {
             val suggestions = mutableListOf<Suggestion>()
             mergedSuggestionFlow().collect {
                 suggestions.add(it)
             }
-            withContext(Dispatchers.Main) {
+            withUIContext {
                 mSuggestionList = suggestions
                 mSuggestionAdapter?.notifyDataSetChanged()
             }