diff --git a/app/src/main/java/io/heckel/ntfy/app/Application.kt b/app/src/main/java/io/heckel/ntfy/app/Application.kt
index b4b104c..6e4e760 100644
--- a/app/src/main/java/io/heckel/ntfy/app/Application.kt
+++ b/app/src/main/java/io/heckel/ntfy/app/Application.kt
@@ -1,7 +1,6 @@
 package io.heckel.ntfy.app
 
 import android.app.Application
-import android.content.Context
 import io.heckel.ntfy.db.Database
 import io.heckel.ntfy.db.Repository
 import io.heckel.ntfy.util.Log
diff --git a/app/src/main/java/io/heckel/ntfy/msg/ApiService.kt b/app/src/main/java/io/heckel/ntfy/msg/ApiService.kt
index 64baa45..bdd8b01 100644
--- a/app/src/main/java/io/heckel/ntfy/msg/ApiService.kt
+++ b/app/src/main/java/io/heckel/ntfy/msg/ApiService.kt
@@ -95,7 +95,7 @@ class ApiService {
                 throw Exception("Unexpected response ${response.code} when polling topic $url")
             }
             val body = response.body?.string()?.trim()
-            if (body == null || body.isEmpty()) return emptyList()
+            if (body.isNullOrEmpty()) return emptyList()
             val notifications = body.lines().mapNotNull { line ->
                 parser.parse(line, subscriptionId = subscriptionId, notificationId = 0) // No notification when we poll
             }
@@ -166,7 +166,7 @@ class ApiService {
     }
 
     class UnauthorizedException(val user: User?) : Exception()
-    class EntityTooLargeException() : Exception()
+    class EntityTooLargeException : Exception()
 
     companion object {
         val USER_AGENT = "ntfy/${BuildConfig.VERSION_NAME} (${BuildConfig.FLAVOR}; Android ${Build.VERSION.RELEASE}; SDK ${Build.VERSION.SDK_INT})"
diff --git a/app/src/main/java/io/heckel/ntfy/msg/DownloadManager.kt b/app/src/main/java/io/heckel/ntfy/msg/DownloadManager.kt
index ab0dd2e..83cfb1a 100644
--- a/app/src/main/java/io/heckel/ntfy/msg/DownloadManager.kt
+++ b/app/src/main/java/io/heckel/ntfy/msg/DownloadManager.kt
@@ -11,7 +11,7 @@ import io.heckel.ntfy.util.Log
  * Download attachment in the background via WorkManager
  *
  * The indirection via WorkManager is required since this code may be executed
- * in a doze state and Internet may not be available. It's also best practice apparently.
+ * in a doze state and Internet may not be available. It's also best practice, apparently.
  */
 object DownloadManager {
     private const val TAG = "NtfyDownloadManager"
diff --git a/app/src/main/java/io/heckel/ntfy/service/SubscriberService.kt b/app/src/main/java/io/heckel/ntfy/service/SubscriberService.kt
index 8577973..2f59aa6 100644
--- a/app/src/main/java/io/heckel/ntfy/service/SubscriberService.kt
+++ b/app/src/main/java/io/heckel/ntfy/service/SubscriberService.kt
@@ -200,7 +200,7 @@ class SubscriberService : Service() {
             // retrieve old messages. This is important, so we don't download attachments from old messages.
 
             val since = sinceByBaseUrl[connectionId.baseUrl] ?: "none"
-            val serviceActive = { -> isServiceStarted }
+            val serviceActive = { isServiceStarted }
             val user = repository.getUser(connectionId.baseUrl)
             val connection = if (repository.getConnectionProtocol() == Repository.CONNECTION_PROTOCOL_WS) {
                 val alarmManager = getSystemService(ALARM_SERVICE) as AlarmManager
diff --git a/app/src/main/java/io/heckel/ntfy/ui/AddFragment.kt b/app/src/main/java/io/heckel/ntfy/ui/AddFragment.kt
index b9770fa..8e56bab 100644
--- a/app/src/main/java/io/heckel/ntfy/ui/AddFragment.kt
+++ b/app/src/main/java/io/heckel/ntfy/ui/AddFragment.kt
@@ -5,8 +5,6 @@ import android.app.AlertDialog
 import android.app.Dialog
 import android.content.Context
 import android.os.Bundle
-import android.text.Editable
-import android.text.TextWatcher
 import android.view.View
 import android.view.WindowManager
 import android.view.inputmethod.InputMethodManager
diff --git a/app/src/main/java/io/heckel/ntfy/ui/DetailAdapter.kt b/app/src/main/java/io/heckel/ntfy/ui/DetailAdapter.kt
index 9aca884..c3a08fe 100644
--- a/app/src/main/java/io/heckel/ntfy/ui/DetailAdapter.kt
+++ b/app/src/main/java/io/heckel/ntfy/ui/DetailAdapter.kt
@@ -25,16 +25,18 @@ import androidx.recyclerview.widget.ListAdapter
 import androidx.recyclerview.widget.RecyclerView
 import com.google.android.material.button.MaterialButton
 import com.stfalcon.imageviewer.StfalconImageViewer
-import io.heckel.ntfy.BuildConfig
 import io.heckel.ntfy.R
 import io.heckel.ntfy.db.*
-import io.heckel.ntfy.msg.DownloadManager
 import io.heckel.ntfy.msg.DownloadAttachmentWorker
+import io.heckel.ntfy.msg.DownloadManager
 import io.heckel.ntfy.msg.DownloadType
 import io.heckel.ntfy.msg.NotificationService
 import io.heckel.ntfy.msg.NotificationService.Companion.ACTION_VIEW
 import io.heckel.ntfy.util.*
-import kotlinx.coroutines.*
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
 
 class DetailAdapter(private val activity: Activity, private val lifecycleScope: CoroutineScope, private val repository: Repository, private val onClick: (Notification) -> Unit, private val onLongClick: (Notification) -> Unit) :
     ListAdapter<Notification, DetailAdapter.DetailViewHolder>(TopicDiffCallback) {
@@ -204,7 +206,7 @@ class DetailAdapter(private val activity: Activity, private val lifecycleScope:
         }
 
         private fun maybeRenderActions(context: Context, notification: Notification) {
-            if (notification.actions != null && notification.actions.isNotEmpty()) {
+            if (!notification.actions.isNullOrEmpty()) {
                 actionsWrapperView.visibility = View.VISIBLE
                 val actionsCount = Math.min(notification.actions.size, 3) // per documentation, only 3 actions are available
                 for (i in 0 until actionsCount) {
@@ -220,7 +222,7 @@ class DetailAdapter(private val activity: Activity, private val lifecycleScope:
 
         private fun resetCardButtons() {
             // clear any previously created dynamic buttons
-            actionsFlow.allViews.forEach { it -> actionsFlow.removeView(it) }
+            actionsFlow.allViews.forEach { actionsFlow.removeView(it) }
             actionsWrapperView.removeAllViews()
             actionsWrapperView.addView(actionsFlow)
         }
diff --git a/app/src/main/java/io/heckel/ntfy/ui/DetailSettingsActivity.kt b/app/src/main/java/io/heckel/ntfy/ui/DetailSettingsActivity.kt
index 91b41d1..82a4072 100644
--- a/app/src/main/java/io/heckel/ntfy/ui/DetailSettingsActivity.kt
+++ b/app/src/main/java/io/heckel/ntfy/ui/DetailSettingsActivity.kt
@@ -175,9 +175,8 @@ class DetailSettingsActivity : AppCompatActivity() {
                     return subscription.mutedUntil.toString()
                 }
             }
-            pref?.summaryProvider = Preference.SummaryProvider<ListPreference> { _ ->
-                val mutedUntilValue = subscription.mutedUntil
-                when (mutedUntilValue) {
+            pref?.summaryProvider = Preference.SummaryProvider<ListPreference> {
+                when (val mutedUntilValue = subscription.mutedUntil) {
                     Repository.MUTED_UNTIL_SHOW_ALL -> getString(R.string.settings_notifications_muted_until_show_all)
                     Repository.MUTED_UNTIL_FOREVER -> getString(R.string.settings_notifications_muted_until_forever)
                     else -> {
@@ -258,7 +257,7 @@ class DetailSettingsActivity : AppCompatActivity() {
             iconSetPref = findPreference(prefId) ?: return
             iconSetPref.isVisible = subscription.icon == null
             iconSetPref.preferenceDataStore = object : PreferenceDataStore() { } // Dummy store to protect from accidentally overwriting
-            iconSetPref.onPreferenceClickListener = Preference.OnPreferenceClickListener { _ ->
+            iconSetPref.onPreferenceClickListener = Preference.OnPreferenceClickListener {
                 iconSetLauncher.launch("image/*")
                 true
             }
@@ -269,7 +268,7 @@ class DetailSettingsActivity : AppCompatActivity() {
             iconRemovePref = findPreference(prefId) ?: return
             iconRemovePref.isVisible = subscription.icon != null
             iconRemovePref.preferenceDataStore = object : PreferenceDataStore() { } // Dummy store to protect from accidentally overwriting
-            iconRemovePref.onPreferenceClickListener = Preference.OnPreferenceClickListener { _ ->
+            iconRemovePref.onPreferenceClickListener = Preference.OnPreferenceClickListener {
                 iconRemovePref.isVisible = false
                 iconSetPref.isVisible = true
                 deleteIcon(subscription.icon)
diff --git a/app/src/main/java/io/heckel/ntfy/ui/MainAdapter.kt b/app/src/main/java/io/heckel/ntfy/ui/MainAdapter.kt
index 4d95d0e..f2a9ea6 100644
--- a/app/src/main/java/io/heckel/ntfy/ui/MainAdapter.kt
+++ b/app/src/main/java/io/heckel/ntfy/ui/MainAdapter.kt
@@ -1,9 +1,7 @@
 package io.heckel.ntfy.ui
 
 import android.content.Context
-import android.graphics.BitmapFactory
 import android.graphics.Color
-import android.net.Uri
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -17,10 +15,8 @@ import io.heckel.ntfy.R
 import io.heckel.ntfy.db.ConnectionState
 import io.heckel.ntfy.db.Repository
 import io.heckel.ntfy.db.Subscription
-import io.heckel.ntfy.msg.NotificationService
-import io.heckel.ntfy.util.Log
-import io.heckel.ntfy.util.readBitmapFromUriOrNull
 import io.heckel.ntfy.util.displayName
+import io.heckel.ntfy.util.readBitmapFromUriOrNull
 import java.text.DateFormat
 import java.util.*
 
diff --git a/app/src/main/java/io/heckel/ntfy/ui/MainViewModel.kt b/app/src/main/java/io/heckel/ntfy/ui/MainViewModel.kt
index 84857db..19e384c 100644
--- a/app/src/main/java/io/heckel/ntfy/ui/MainViewModel.kt
+++ b/app/src/main/java/io/heckel/ntfy/ui/MainViewModel.kt
@@ -8,10 +8,8 @@ import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.viewModelScope
 import io.heckel.ntfy.db.*
 import io.heckel.ntfy.up.Distributor
-import io.heckel.ntfy.util.Log
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
-import kotlin.collections.List
 
 class SubscriptionsViewModel(private val repository: Repository) : ViewModel() {
     fun list(): LiveData<List<Subscription>> {
diff --git a/app/src/main/java/io/heckel/ntfy/ui/NotificationFragment.kt b/app/src/main/java/io/heckel/ntfy/ui/NotificationFragment.kt
index 8509e8e..2d84879 100644
--- a/app/src/main/java/io/heckel/ntfy/ui/NotificationFragment.kt
+++ b/app/src/main/java/io/heckel/ntfy/ui/NotificationFragment.kt
@@ -8,7 +8,6 @@ import android.widget.RadioButton
 import androidx.fragment.app.DialogFragment
 import androidx.lifecycle.lifecycleScope
 import io.heckel.ntfy.R
-import io.heckel.ntfy.db.Database
 import io.heckel.ntfy.db.Repository
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
diff --git a/app/src/main/java/io/heckel/ntfy/ui/UserFragment.kt b/app/src/main/java/io/heckel/ntfy/ui/UserFragment.kt
index d4a7097..6da8304 100644
--- a/app/src/main/java/io/heckel/ntfy/ui/UserFragment.kt
+++ b/app/src/main/java/io/heckel/ntfy/ui/UserFragment.kt
@@ -3,13 +3,11 @@ package io.heckel.ntfy.ui
 import android.app.AlertDialog
 import android.app.Dialog
 import android.content.Context
-import android.os.Build
 import android.os.Bundle
 import android.view.View
 import android.view.WindowManager
 import android.widget.Button
 import android.widget.TextView
-import androidx.core.content.ContextCompat
 import androidx.fragment.app.DialogFragment
 import com.google.android.material.textfield.TextInputEditText
 import io.heckel.ntfy.R
diff --git a/app/src/main/java/io/heckel/ntfy/up/BroadcastReceiver.kt b/app/src/main/java/io/heckel/ntfy/up/BroadcastReceiver.kt
index 9119e15..23f1985 100644
--- a/app/src/main/java/io/heckel/ntfy/up/BroadcastReceiver.kt
+++ b/app/src/main/java/io/heckel/ntfy/up/BroadcastReceiver.kt
@@ -10,12 +10,10 @@ import io.heckel.ntfy.service.SubscriberServiceManager
 import io.heckel.ntfy.util.*
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
-import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import java.util.*
-import kotlin.random.Random
 
 /**
  * This is the UnifiedPush broadcast receiver to handle the distributor actions REGISTER and UNREGISTER.
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 2d4f08c..31f29e3 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -309,7 +309,7 @@
     <string name="detail_settings_appearance_header">Darstellung</string>
     <string name="detail_settings_appearance_icon_set_title">Abo-Icon</string>
     <string name="detail_settings_appearance_icon_set_summary">Ein Icon zur Darstellung in Benachrichtigungen auswählen</string>
-    <string name="detail_settings_appearance_icon_remove_title">Abo-Icon (entfernen durch antippen)</string>
+    <string name="detail_settings_appearance_icon_remove_title">Abo-Icon (entfernen durch Antippen)</string>
     <string name="detail_settings_appearance_icon_error_saving">Kann Icon nicht speichern: %1$s</string>
     <string name="detail_settings_global_setting_title">Globale Einstellung verwenden</string>
     <string name="detail_settings_global_setting_suffix">globale Einstellung</string>
@@ -323,9 +323,9 @@
     <string name="add_dialog_base_urls_dropdown_clear">Service-URL löschen</string>
     <string name="detail_settings_appearance_display_name_default_summary">%1$s (Standard)</string>
     <string name="detail_settings_appearance_display_name_title">Anzeigename</string>
-    <string name="detail_settings_appearance_display_name_message">Gib einen eigenen Anzeigenamen für diese Abo an. Leer lassen für den Standardwert (%1$s).</string>
+    <string name="detail_settings_appearance_display_name_message">Gib einen eigenen Anzeigenamen für dieses Abo an. Leer lassen für den Standardwert (%1$s).</string>
     <string name="detail_settings_about_topic_url_title">Themen-URL</string>
     <string name="detail_settings_about_header">Über</string>
     <string name="detail_settings_about_topic_url_copied_to_clipboard_message">In Zwischenablage kopiert</string>
     <string name="main_menu_donate_title">Spenden 💸</string>
-</resources>
\ No newline at end of file
+</resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d26c9d9..f7ac0c1 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -318,7 +318,7 @@
     <string name="settings_advanced_broadcast_summary_disabled">Apps cannot receive notifications as broadcasts</string>
     <string name="settings_advanced_record_logs_title">Record logs</string>
     <string name="settings_advanced_record_logs_summary_enabled">Logging (up to 1,000 entries) to device …</string>
-    <string name="settings_advanced_record_logs_summary_disabled">Turn on logging so you can share logs later to diagnose issues.</string>
+    <string name="settings_advanced_record_logs_summary_disabled">Turn on logging, so you can share logs later to diagnose issues.</string>
     <string name="settings_advanced_export_logs_title">Copy/upload logs</string>
     <string name="settings_advanced_export_logs_summary">Copy logs to the clipboard, or upload to nopaste.net (owned by the ntfy author). Hostnames and topics can be censored, notifications will never be.</string>
     <string name="settings_advanced_export_logs_entry_copy_original">Copy to clipboard</string>