Update unread widgets from a background thread

app/k9mail/build.gradle

@@ -22,6 +22,7 @@ dependencies {
     implementation "androidx.core:core-ktx:${versions.coreKtx}"
     implementation "com.takisoft.preferencex:preferencex:${versions.preferencesFix}"
     implementation "com.jakewharton.timber:timber:${versions.timber}"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:${versions.kotlinCoroutines}"
 
     testImplementation "org.robolectric:robolectric:${versions.robolectric}"
     testImplementation "junit:junit:${versions.junit}"

app/k9mail/src/main/java/com/fsck/k9/provider/UnreadWidgetProvider.kt

@@ -14,6 +14,9 @@ import com.fsck.k9.inject
 import com.fsck.k9.widget.unread.UnreadWidgetConfigurationActivity
 import com.fsck.k9.widget.unread.UnreadWidgetData
 import com.fsck.k9.widget.unread.UnreadWidgetRepository
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
 import timber.log.Timber
 
 /**
@@ -28,11 +31,18 @@ class UnreadWidgetProvider : AppWidgetProvider(), EarlyInit {
     private val repository: UnreadWidgetRepository by inject()
 
     override fun onUpdate(context: Context, appWidgetManager: AppWidgetManager, appWidgetIds: IntArray) {
+        val pendingResult = goAsync()
+
+        GlobalScope.launch(Dispatchers.IO) {
+            updateWidgets(context, appWidgetManager, appWidgetIds)
+            pendingResult.finish()
+        }
+    }
+
+    private fun updateWidgets(context: Context, appWidgetManager: AppWidgetManager, appWidgetIds: IntArray) {
         for (widgetId in appWidgetIds) {
-            val widgetData = repository.getWidgetData(widgetId)
-            widgetData?.let {
-                updateWidget(context, appWidgetManager, it)
-            }
+            val widgetData = repository.getWidgetData(widgetId) ?: continue
+            updateWidget(context, appWidgetManager, widgetData)
         }
     }
 

app/ui/build.gradle

@@ -48,8 +48,8 @@ dependencies {
     implementation "net.jcip:jcip-annotations:1.0"
     implementation "com.jakewharton.timber:timber:${versions.timber}"
     implementation "org.apache.james:apache-mime4j-core:${versions.mime4j}"
-    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.5"
-    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.5"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:${versions.kotlinCoroutines}"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:${versions.kotlinCoroutines}"
 
     testImplementation project(':mail:testing')
     testImplementation project(':app:storage')

build.gradle

@@ -10,6 +10,7 @@ buildscript {
 
         versions = [
                 'kotlin': '1.3.72',
+                'kotlinCoroutines': '1.3.5',
                 'androidxAppCompat': '1.2.0-beta01',
                 'androidxRecyclerView': '1.1.0',
                 'androidxLifecycle': '2.2.0',