diff --git a/.travis.yml b/.travis.yml
index edfc5a7c0..4d33cff05 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ language: android
 android:
   components:
   - build-tools-29.0.2
-  - android-28
+  - android-29
   - extra-android-m2repository
   - extra-google-m2repository
   - extra-android-support
@@ -11,7 +11,7 @@ android:
   licenses:
   - android-sdk-license-.+
 before_install:
-- yes | sdkmanager "platforms;android-28" # workaround for accepting the license
+- yes | sdkmanager "platforms;android-29" # workaround for accepting the license
 - if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then
     openssl aes-256-cbc -K $encrypted_e56be693d4fd_key -iv $encrypted_e56be693d4fd_iv -in "$PWD/.travis/secrets.tar.enc" -out secrets.tar -d;
     tar xf secrets.tar;
diff --git a/app/build.gradle b/app/build.gradle
index 53b39b876..e37db3836 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -29,14 +29,14 @@ ext {
 }
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion 29
     buildToolsVersion '29.0.2'
     publishNonDefault true
 
     defaultConfig {
         applicationId "eu.kanade.tachiyomi"
         minSdkVersion 21
-        targetSdkVersion 28
+        targetSdkVersion 29
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         versionCode 41
         versionName "0.8.4"
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupRestoreService.kt b/app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupRestoreService.kt
index db6866e28..87701c20d 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupRestoreService.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupRestoreService.kt
@@ -189,7 +189,7 @@ class BackupRestoreService : Service() {
 
         return Observable.just(Unit)
                 .map {
-                    val reader = JsonReader(contentResolver.openInputStream(uri).bufferedReader())
+                    val reader = JsonReader(contentResolver.openInputStream(uri)!!.bufferedReader())
                     val json = JsonParser().parse(reader).asJsonObject
 
                     // Get parser version
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateJob.kt b/app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateJob.kt
index ab386b133..1b992850a 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateJob.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateJob.kt
@@ -22,7 +22,7 @@ class LibraryUpdateJob : Job() {
             val preferences = Injekt.get<PreferencesHelper>()
             val interval = prefInterval ?: preferences.libraryUpdateInterval().getOrDefault()
             if (interval > 0) {
-                val restrictions = preferences.libraryUpdateRestriction()
+                val restrictions = preferences.libraryUpdateRestriction()!!
                 val acRestriction = "ac" in restrictions
                 val wifiRestriction = if ("wifi" in restrictions)
                     JobRequest.NetworkType.UNMETERED
@@ -44,4 +44,4 @@ class LibraryUpdateJob : Job() {
             JobManager.instance().cancelAllForTag(TAG)
         }
     }
-}
\ No newline at end of file
+}
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/DialogController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/DialogController.kt
index 7d59b864c..fafdbe160 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/DialogController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/DialogController.kt
@@ -38,7 +38,7 @@ abstract class DialogController : RestoreViewOnCreateController {
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup, savedViewState: Bundle?): View {
         dialog = onCreateDialog(savedViewState)
-        dialog!!.ownerActivity = activity
+        dialog!!.setOwnerActivity(activity!!)
         dialog!!.setOnDismissListener { dismissDialog() }
         if (savedViewState != null) {
             val dialogState = savedViewState.getBundle(SAVED_DIALOG_STATE_TAG)
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt
index dd95147fd..e3e8edc27 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt
@@ -4,6 +4,7 @@ import android.app.Activity
 import android.content.Intent
 import android.content.res.Configuration
 import android.graphics.Color
+import android.net.Uri
 import android.os.Bundle
 import com.google.android.material.tabs.TabLayout
 import androidx.core.graphics.drawable.DrawableCompat
@@ -498,9 +499,9 @@ class LibraryController(
 
             try {
                 // Get the file's input stream from the incoming Intent
-                activity.contentResolver.openInputStream(data.data).use {
+                activity.contentResolver.openInputStream(data.data ?: Uri.EMPTY).use {
                     // Update cover to selected file, show error if something went wrong
-                    if (presenter.editCoverWithStream(it, manga)) {
+                    if (it != null && presenter.editCoverWithStream(it, manga)) {
                         // TODO refresh cover
                     } else {
                         activity.toast(R.string.notification_cover_update_failed)
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoController.kt
index 7410e788e..221eae06a 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoController.kt
@@ -512,7 +512,7 @@ class MangaInfoController : NucleusController<MangaInfoPresenter>(),
         val view = view ?: return
 
         val clipboard = activity.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
-        clipboard.primaryClip = ClipData.newPlainText(label, content)
+        clipboard.setPrimaryClip(ClipData.newPlainText(label, content))
 
         activity.toast(view.context.getString(R.string.copied_to_clipboard, content.truncateCenter(20)),
                 Toast.LENGTH_SHORT)
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/track/TrackSearchAdapter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/track/TrackSearchAdapter.kt
index 930651270..9fde89cd3 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/track/TrackSearchAdapter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/track/TrackSearchAdapter.kt
@@ -19,7 +19,7 @@ class TrackSearchAdapter(context: Context)
     override fun getView(position: Int, view: View?, parent: ViewGroup): View {
         var v = view
         // Get the data item for this position
-        val track = getItem(position)
+        val track = getItem(position)!!
         // Check if an existing view is being reused, otherwise inflate the view
         val holder: TrackSearchHolder // view lookup cache stored in tag
         if (v == null) {
@@ -76,4 +76,4 @@ class TrackSearchAdapter(context: Context)
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DownloadPageLoader.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DownloadPageLoader.kt
index 6a207502a..d3d7953be 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DownloadPageLoader.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DownloadPageLoader.kt
@@ -1,6 +1,7 @@
 package eu.kanade.tachiyomi.ui.reader.loader
 
 import android.app.Application
+import android.net.Uri
 import eu.kanade.tachiyomi.data.database.models.Manga
 import eu.kanade.tachiyomi.data.download.DownloadManager
 import eu.kanade.tachiyomi.source.Source
@@ -33,7 +34,7 @@ class DownloadPageLoader(
             .map { pages ->
                 pages.map { page ->
                     ReaderPage(page.index, page.url, page.imageUrl) {
-                        context.contentResolver.openInputStream(page.uri)
+                        context.contentResolver.openInputStream(page.uri ?: Uri.EMPTY)!!
                     }.apply {
                         status = Page.READY
                     }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt
index 536721c8c..2f31da321 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt
@@ -148,7 +148,9 @@ class SettingsBackupController : SettingsController() {
                 val flags = Intent.FLAG_GRANT_READ_URI_PERMISSION or
                         Intent.FLAG_GRANT_WRITE_URI_PERMISSION
 
-                activity.contentResolver.takePersistableUriPermission(uri, flags)
+                if (uri != null) {
+                    activity.contentResolver.takePersistableUriPermission(uri, flags)
+                }
 
                 // Set backup Uri
                 preferences.backupsDirectory().set(uri.toString())
@@ -160,7 +162,10 @@ class SettingsBackupController : SettingsController() {
                 val flags = Intent.FLAG_GRANT_READ_URI_PERMISSION or
                         Intent.FLAG_GRANT_WRITE_URI_PERMISSION
 
-                activity.contentResolver.takePersistableUriPermission(uri, flags)
+                if (uri != null) {
+                    activity.contentResolver.takePersistableUriPermission(uri, flags)
+                }
+
                 val file = UniFile.fromUri(activity, uri)
 
                 CreatingBackupDialog().showDialog(router, TAG_CREATING_BACKUP_DIALOG)
@@ -168,7 +173,9 @@ class SettingsBackupController : SettingsController() {
             }
             CODE_BACKUP_RESTORE -> if (data != null && resultCode == Activity.RESULT_OK) {
                 val uri = data.data
-                RestoreBackupDialog(uri).showDialog(router)
+                if (uri != null) {
+                    RestoreBackupDialog(uri).showDialog(router)
+                }
             }
         }
     }
@@ -283,7 +290,7 @@ class SettingsBackupController : SettingsController() {
                         val context = applicationContext
                         if (context != null) {
                             RestoringBackupDialog().showDialog(router, TAG_RESTORING_BACKUP_DIALOG)
-                            BackupRestoreService.start(context, args.getParcelable(KEY_URI))
+                            BackupRestoreService.start(context, args.getParcelable(KEY_URI)!!)
                         }
                     }
                     .build()
@@ -357,7 +364,7 @@ class SettingsBackupController : SettingsController() {
                     .negativeText(R.string.action_open_log)
                     .onNegative { _, _ ->
                         val context = applicationContext ?: return@onNegative
-                        if (!path.isEmpty()) {
+                        if (!path.isNullOrEmpty()) {
                             val destFile = File(path, file)
                             val uri = destFile.getUriCompat(context)
                             val sendIntent = Intent(Intent.ACTION_VIEW).apply {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsDownloadController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsDownloadController.kt
index 42c19f7ba..51e313e3c 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsDownloadController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsDownloadController.kt
@@ -112,8 +112,10 @@ class SettingsDownloadController : SettingsController() {
                 val flags = Intent.FLAG_GRANT_READ_URI_PERMISSION or
                         Intent.FLAG_GRANT_WRITE_URI_PERMISSION
 
-                @Suppress("NewApi")
-                context.contentResolver.takePersistableUriPermission(uri, flags)
+                if (uri != null) {
+                    @Suppress("NewApi")
+                    context.contentResolver.takePersistableUriPermission(uri, flags)
+                }
 
                 val file = UniFile.fromUri(context, uri)
                 preferences.downloadsDirectory().set(file.uri.toString())
diff --git a/app/src/main/java/eu/kanade/tachiyomi/util/LocaleHelper.kt b/app/src/main/java/eu/kanade/tachiyomi/util/LocaleHelper.kt
index 94a8e3a6e..a9ec6b25d 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/util/LocaleHelper.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/util/LocaleHelper.kt
@@ -4,7 +4,6 @@ import android.app.Application
 import android.content.Context
 import android.content.res.Configuration
 import android.os.Build
-import android.os.LocaleList
 import android.view.ContextThemeWrapper
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
@@ -43,7 +42,7 @@ object LocaleHelper {
      *
      * @param pref the string value stored in preferences.
      */
-    fun getLocaleFromString(pref: String): Locale? {
+    fun getLocaleFromString(pref: String?): Locale? {
         if (pref.isNullOrEmpty()) {
             return null
         }
@@ -138,7 +137,7 @@ object LocaleHelper {
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
             newConfig.locale = locale
         } else {
-            newConfig.locales = LocaleList(locale)
+            newConfig.setLocale(locale)
         }
         return newConfig
     }