Settings in Kotlin

app/src/main/java/eu/kanade/tachiyomi/data/io/IOHandler.kt

@@ -1,23 +1,20 @@
-@file:JvmName("IOHandler")
 package eu.kanade.tachiyomi.data.io
 
 import android.content.Context
-import eu.kanade.tachiyomi.R
-import eu.kanade.tachiyomi.util.ToastUtil
 import java.io.File
 import java.io.FileInputStream
 import java.io.FileOutputStream
 import java.io.IOException
 
 /**
-     * Returns temp file location
+ * Returns temp file location.
  *
-     * @param context context of application
+ * @param context context of application.
- * @throws IOException IO exception
+ * @throws IOException IO exception.
-     * @return location of temp file
+ * @return location of temp file.
  */
-    @Throws(IOException::class)
+@Throws(IOException::class)
-    private fun getTempFilename(context: Context): String {
+private fun getTempFilename(context: Context): String {
     // Get output directory.
     val outputDir = context.cacheDir
 
@@ -26,37 +23,33 @@ import java.io.IOException
 
     // Return path of temporary file
     return outputFile.absolutePath
-    }
+}
 
-    /**
+/**
-     * Download media to temp location and returns file path
+ * Download media to temp location and returns file path.
  *
-     * @param input input stream containing input file
+ * @param input input stream containing input file.
-     * @param context context of application
+ * @param context context of application.
-     * @throws IOException IO exception
+ * @throws IOException IO exception.
-     * @return location of temp file
+ * @return location of temp file.
  */
-    @Throws(IOException::class)
+@Throws(IOException::class)
-    fun downloadMediaAndReturnPath(input: FileInputStream, context: Context): String {
+fun downloadMediaAndReturnPath(input: FileInputStream, context: Context): String {
-        var tempFilename = ""
     var output: FileOutputStream? = null
     try {
         // Get temp file name.
-            tempFilename = getTempFilename(context)
+        val tempFilename = getTempFilename(context)
 
         output = FileOutputStream(tempFilename)
+
         // Copy input stream to temp location.
         input.copyTo(output)
-        } catch (e: IOException) {
+
-            // Show user something went wrong and print stackTrace.
+        return tempFilename
-            ToastUtil.showShort(context, R.string.notification_manga_update_failed)
-            e.printStackTrace()
     } finally {
         // Close streams.
         input.close()
         output?.close()
     }
 
-        // Return temp name.
+}
-        return tempFilename
-    }

app/src/main/java/eu/kanade/tachiyomi/ui/base/activity/BaseActivity.java

@@ -7,6 +7,8 @@ import android.view.MenuItem;
 
 import org.greenrobot.eventbus.EventBus;
 
+import eu.kanade.tachiyomi.App;
+import eu.kanade.tachiyomi.injection.component.AppComponent;
 import icepick.Icepick;
 
 public class BaseActivity extends AppCompatActivity {
@@ -67,4 +69,8 @@ public class BaseActivity extends AppCompatActivity {
         EventBus.getDefault().unregister(this);
     }
 
+    protected AppComponent getApplicationComponent() {
+        return App.get(this).getComponent();
+    }
+
 }

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryFragment.kt

@@ -14,6 +14,7 @@ import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.database.models.Category
 import eu.kanade.tachiyomi.data.database.models.Manga
+import eu.kanade.tachiyomi.data.io.downloadMediaAndReturnPath
 import eu.kanade.tachiyomi.data.library.LibraryUpdateService
 import eu.kanade.tachiyomi.event.LibraryMangasEvent
 import eu.kanade.tachiyomi.ui.base.fragment.BaseRxFragment
@@ -21,6 +22,7 @@ import eu.kanade.tachiyomi.ui.category.CategoryActivity
 import eu.kanade.tachiyomi.ui.main.MainActivity
 import eu.kanade.tachiyomi.util.ToastUtil
 import eu.kanade.tachiyomi.util.inflate
+import eu.kanade.tachiyomi.util.toast
 import kotlinx.android.synthetic.main.fragment_library.*
 import nucleus.factory.RequiresPresenter
 import org.greenrobot.eventbus.EventBus
@@ -307,8 +309,8 @@ class LibraryFragment : BaseRxFragment<LibraryPresenter>(), ActionMode.Callback
         }
     }
 
-    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent) {
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
-        if (resultCode == Activity.RESULT_OK && requestCode == REQUEST_IMAGE_OPEN) {
+        if (data != null && resultCode == Activity.RESULT_OK && requestCode == REQUEST_IMAGE_OPEN) {
             selectedCoverManga?.let { manga ->
 
                 try {
@@ -316,8 +318,7 @@ class LibraryFragment : BaseRxFragment<LibraryPresenter>(), ActionMode.Callback
                     val inputStream = context.contentResolver.openInputStream(data.data)
 
                     // Convert to absolute path to prevent FileNotFoundException
-                    val result = eu.kanade.tachiyomi.data.io.downloadMediaAndReturnPath(inputStream as FileInputStream,
+                    val result = downloadMediaAndReturnPath(inputStream as FileInputStream, context)
-                        context)
 
                     // Get file from filepath
                     val picture = File(result)
@@ -326,11 +327,11 @@ class LibraryFragment : BaseRxFragment<LibraryPresenter>(), ActionMode.Callback
                     if (presenter.editCoverWithLocalFile(picture, manga)) {
                         adapter.refreshRegisteredAdapters()
                     } else {
-                        ToastUtil.showShort(context, R.string.notification_manga_update_failed)
+                        context.toast(R.string.notification_manga_update_failed)
                     }
 
                 } catch (e: IOException) {
-                    ToastUtil.showShort(context, R.string.notification_manga_update_failed)
+                    context.toast(R.string.notification_manga_update_failed)
                     e.printStackTrace()
                 }
             }

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsAboutFragment.java

@@ -1,132 +0,0 @@
-package eu.kanade.tachiyomi.ui.setting;
-
-import android.os.Bundle;
-import android.preference.Preference;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-
-import com.afollestad.materialdialogs.MaterialDialog;
-
-import java.text.DateFormat;
-import java.text.ParseException;
-import java.text.SimpleDateFormat;
-import java.util.Date;
-import java.util.Locale;
-import java.util.TimeZone;
-
-import eu.kanade.tachiyomi.BuildConfig;
-import eu.kanade.tachiyomi.R;
-import eu.kanade.tachiyomi.data.updater.GithubUpdateChecker;
-import eu.kanade.tachiyomi.data.updater.UpdateDownloader;
-import eu.kanade.tachiyomi.util.ToastUtil;
-import rx.Subscription;
-import rx.android.schedulers.AndroidSchedulers;
-import rx.schedulers.Schedulers;
-
-public class SettingsAboutFragment extends SettingsNestedFragment {
-    /**
-     * Checks for new releases
-     */
-    private GithubUpdateChecker updateChecker;
-
-    /**
-     * The subscribtion service of the obtained release object
-     */
-    private Subscription releaseSubscription;
-
-    public static SettingsNestedFragment newInstance(int resourcePreference, int resourceTitle) {
-        SettingsNestedFragment fragment = new SettingsAboutFragment();
-        fragment.setArgs(resourcePreference, resourceTitle);
-        return fragment;
-    }
-
-    @Override
-    public void onCreate(Bundle savedInstanceState) {
-        //Check for update
-        updateChecker = new GithubUpdateChecker(getActivity());
-
-        super.onCreate(savedInstanceState);
-    }
-
-    @Override
-    public void onDestroyView() {
-        if (releaseSubscription != null)
-            releaseSubscription.unsubscribe();
-
-        super.onDestroyView();
-    }
-
-    @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedState) {
-        Preference version = findPreference(getString(R.string.pref_version));
-        Preference buildTime = findPreference(getString(R.string.pref_build_time));
-
-        version.setSummary(BuildConfig.DEBUG ? "r" + BuildConfig.COMMIT_COUNT :
-                BuildConfig.VERSION_NAME);
-
-        //Set onClickListener to check for new version
-        version.setOnPreferenceClickListener(preference -> {
-            if (!BuildConfig.DEBUG && BuildConfig.INCLUDE_UPDATER)
-                checkVersion();
-            return true;
-        });
-
-        buildTime.setSummary(getFormattedBuildTime());
-
-        return super.onCreateView(inflater, container, savedState);
-    }
-
-    private String getFormattedBuildTime() {
-        try {
-            DateFormat inputDf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm'Z'");
-            inputDf.setTimeZone(TimeZone.getTimeZone("UTC"));
-            Date date = inputDf.parse(BuildConfig.BUILD_TIME);
-
-            DateFormat outputDf = DateFormat.getDateTimeInstance(
-                    DateFormat.MEDIUM, DateFormat.SHORT, Locale.getDefault());
-            outputDf.setTimeZone(TimeZone.getDefault());
-
-            return outputDf.format(date);
-        } catch (ParseException e) {
-            // Do nothing
-        }
-        return "";
-    }
-
-    /**
-     * Checks version and shows a user prompt when update available.
-     */
-    private void checkVersion() {
-        releaseSubscription = updateChecker.checkForApplicationUpdate()
-                .subscribeOn(Schedulers.io())
-                .observeOn(AndroidSchedulers.mainThread())
-                .subscribe(release -> {
-                    //Get version of latest release
-                    String newVersion = release.getVersion();
-                    newVersion = newVersion.replaceAll("[^\\d.]", "");
-
-                    //Check if latest version is different from current version
-                    if (!newVersion.equals(BuildConfig.VERSION_NAME)) {
-                        String downloadLink = release.getDownloadLink();
-                        String body = release.getChangeLog();
-
-                        //Create confirmation window
-                        new MaterialDialog.Builder(getActivity())
-                                .title(getString(R.string.update_check_title))
-                                .content(body)
-                                .positiveText(getString(R.string.update_check_confirm))
-                                .negativeText(getString(R.string.update_check_ignore))
-                                .onPositive((dialog, which) -> {
-                                    // User output that download has started
-                                    ToastUtil.showShort(getActivity(), getString(R.string.update_check_download_started));
-                                    // Start download
-                                    new UpdateDownloader(getActivity().getApplicationContext()).execute(downloadLink);
-                                })
-                                .show();
-                    } else {
-                        ToastUtil.showShort(getActivity(), getString(R.string.update_check_no_new_updates));
-                    }
-                }, Throwable::printStackTrace);
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsAboutFragment.kt

@@ -0,0 +1,119 @@
+package eu.kanade.tachiyomi.ui.setting
+
+import android.os.Bundle
+import android.view.View
+import com.afollestad.materialdialogs.MaterialDialog
+import eu.kanade.tachiyomi.BuildConfig
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.data.updater.GithubUpdateChecker
+import eu.kanade.tachiyomi.data.updater.UpdateDownloader
+import eu.kanade.tachiyomi.util.ToastUtil
+import eu.kanade.tachiyomi.util.toast
+import rx.Subscription
+import rx.android.schedulers.AndroidSchedulers
+import rx.schedulers.Schedulers
+import java.text.DateFormat
+import java.text.ParseException
+import java.text.SimpleDateFormat
+import java.util.*
+
+class SettingsAboutFragment : SettingsNestedFragment() {
+    /**
+     * Checks for new releases
+     */
+    private val updateChecker by lazy { GithubUpdateChecker(activity) }
+
+    /**
+     * The subscribtion service of the obtained release object
+     */
+    private var releaseSubscription: Subscription? = null
+
+    companion object {
+
+        fun newInstance(resourcePreference: Int, resourceTitle: Int): SettingsNestedFragment {
+            val fragment = SettingsAboutFragment()
+            fragment.setArgs(resourcePreference, resourceTitle)
+            return fragment
+        }
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        val version = findPreference(getString(R.string.pref_version))
+        val buildTime = findPreference(getString(R.string.pref_build_time))
+
+        version.summary = if (BuildConfig.DEBUG)
+            "r" + BuildConfig.COMMIT_COUNT
+        else
+            BuildConfig.VERSION_NAME
+
+        //Set onClickListener to check for new version
+        version.setOnPreferenceClickListener {
+            if (!BuildConfig.DEBUG && BuildConfig.INCLUDE_UPDATER)
+                checkVersion()
+            true
+        }
+
+        buildTime.summary = getFormattedBuildTime()
+    }
+
+    override fun onDestroyView() {
+        releaseSubscription?.unsubscribe()
+        super.onDestroyView()
+    }
+
+    private fun getFormattedBuildTime(): String {
+        try {
+            val inputDf = SimpleDateFormat("yyyy-MM-dd'T'HH:mm'Z'")
+            inputDf.timeZone = TimeZone.getTimeZone("UTC")
+            val date = inputDf.parse(BuildConfig.BUILD_TIME)
+
+            val outputDf = DateFormat.getDateTimeInstance(
+                    DateFormat.MEDIUM, DateFormat.SHORT, Locale.getDefault())
+            outputDf.timeZone = TimeZone.getDefault()
+
+            return outputDf.format(date)
+        } catch (e: ParseException) {
+            return BuildConfig.BUILD_TIME
+        }
+    }
+
+    /**
+     * Checks version and shows a user prompt if an update is available.
+     */
+    private fun checkVersion() {
+        releaseSubscription?.unsubscribe()
+
+        releaseSubscription = updateChecker.checkForApplicationUpdate()
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe({ release ->
+                    //Get version of latest release
+                    var newVersion = release.version
+                    newVersion = newVersion.replace("[^\\d.]".toRegex(), "")
+
+                    //Check if latest version is different from current version
+                    if (newVersion != BuildConfig.VERSION_NAME) {
+                        val downloadLink = release.downloadLink
+                        val body = release.changeLog
+
+                        //Create confirmation window
+                        MaterialDialog.Builder(activity)
+                                .title(R.string.update_check_title)
+                                .content(body)
+                                .positiveText(getString(R.string.update_check_confirm))
+                                .negativeText(getString(R.string.update_check_ignore))
+                                .onPositive { dialog, which ->
+                                    // User output that download has started
+                                    context.toast(R.string.update_check_download_started)
+                                    // Start download
+                                    UpdateDownloader(activity.applicationContext).execute(downloadLink)
+                                }.show()
+                    } else {
+                        ToastUtil.showShort(activity, getString(R.string.update_check_no_new_updates))
+                    }
+                }, {
+                    it.printStackTrace()
+                })
+    }
+
+}

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsAccountsFragment.java

@@ -1,82 +0,0 @@
-package eu.kanade.tachiyomi.ui.setting;
-
-import android.os.Bundle;
-import android.preference.PreferenceCategory;
-import android.preference.PreferenceScreen;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-
-import java.util.List;
-
-import javax.inject.Inject;
-
-import eu.kanade.tachiyomi.App;
-import eu.kanade.tachiyomi.data.mangasync.MangaSyncManager;
-import eu.kanade.tachiyomi.data.mangasync.base.MangaSyncService;
-import eu.kanade.tachiyomi.data.source.SourceManager;
-import eu.kanade.tachiyomi.data.source.base.Source;
-import eu.kanade.tachiyomi.widget.preference.MangaSyncLoginDialog;
-import eu.kanade.tachiyomi.widget.preference.SourceLoginDialog;
-import rx.Observable;
-
-public class SettingsAccountsFragment extends SettingsNestedFragment {
-
-    @Inject SourceManager sourceManager;
-    @Inject MangaSyncManager syncManager;
-
-    public static SettingsNestedFragment newInstance(int resourcePreference, int resourceTitle) {
-        SettingsNestedFragment fragment = new SettingsAccountsFragment();
-        fragment.setArgs(resourcePreference, resourceTitle);
-        return fragment;
-    }
-
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        App.get(getActivity()).getComponent().inject(this);
-    }
-
-    @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedSate) {
-        View view = super.onCreateView(inflater, container, savedSate);
-
-        PreferenceScreen screen = getPreferenceScreen();
-
-        List<Source> sourceAccounts = getSourcesWithLogin();
-
-        PreferenceCategory sourceCategory = new PreferenceCategory(screen.getContext());
-        sourceCategory.setTitle("Sources");
-        screen.addPreference(sourceCategory);
-
-        for (Source source : sourceAccounts) {
-            SourceLoginDialog dialog = new SourceLoginDialog(
-                    screen.getContext(), preferences, source);
-            dialog.setTitle(source.getName());
-
-            sourceCategory.addPreference(dialog);
-        }
-
-        PreferenceCategory mangaSyncCategory = new PreferenceCategory(screen.getContext());
-        mangaSyncCategory.setTitle("Sync");
-        screen.addPreference(mangaSyncCategory);
-
-        for (MangaSyncService sync : syncManager.getServices()) {
-            MangaSyncLoginDialog dialog = new MangaSyncLoginDialog(
-                    screen.getContext(), preferences, sync);
-            dialog.setTitle(sync.getName());
-
-            mangaSyncCategory.addPreference(dialog);
-        }
-
-        return view;
-    }
-
-    private List<Source> getSourcesWithLogin() {
-        return Observable.from(sourceManager.getSources())
-                .filter(Source::isLoginRequired)
-                .toList()
-                .toBlocking()
-                .single();
-    }
-
-}

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsAccountsFragment.kt

@@ -0,0 +1,51 @@
+package eu.kanade.tachiyomi.ui.setting
+
+import android.os.Bundle
+import android.preference.PreferenceCategory
+import android.view.View
+import eu.kanade.tachiyomi.data.source.base.Source
+import eu.kanade.tachiyomi.widget.preference.MangaSyncLoginDialog
+import eu.kanade.tachiyomi.widget.preference.SourceLoginDialog
+
+class SettingsAccountsFragment : SettingsNestedFragment() {
+
+    companion object {
+
+        fun newInstance(resourcePreference: Int, resourceTitle: Int): SettingsNestedFragment {
+            val fragment = SettingsAccountsFragment()
+            fragment.setArgs(resourcePreference, resourceTitle)
+            return fragment
+        }
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        PreferenceCategory(context).apply {
+            preferenceScreen.addPreference(this)
+            title = "Sources"
+
+            for (source in getSourcesWithLogin()) {
+                val dialog = SourceLoginDialog(context, preferences, source)
+                dialog.title = source.name
+
+                addPreference(dialog)
+            }
+        }
+
+        PreferenceCategory(context).apply {
+            preferenceScreen.addPreference(this)
+            title = "Sync"
+
+            for (sync in settingsActivity.syncManager.services) {
+                val dialog = MangaSyncLoginDialog(context, preferences, sync)
+                dialog.title = sync.name
+
+                addPreference(dialog)
+            }
+        }
+    }
+
+    fun getSourcesWithLogin(): List<Source> {
+        return settingsActivity.sourceManager.sources.filter { it.isLoginRequired }
+    }
+
+}

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsActivity.java

@@ -1,96 +0,0 @@
-package eu.kanade.tachiyomi.ui.setting;
-
-import android.os.Bundle;
-import android.preference.PreferenceFragment;
-import android.support.v7.widget.Toolbar;
-
-import javax.inject.Inject;
-
-import butterknife.Bind;
-import butterknife.ButterKnife;
-import eu.kanade.tachiyomi.App;
-import eu.kanade.tachiyomi.R;
-import eu.kanade.tachiyomi.data.cache.ChapterCache;
-import eu.kanade.tachiyomi.data.database.DatabaseHelper;
-import eu.kanade.tachiyomi.data.preference.PreferencesHelper;
-import eu.kanade.tachiyomi.ui.base.activity.BaseActivity;
-
-public class SettingsActivity extends BaseActivity {
-
-    @Inject PreferencesHelper preferences;
-    @Inject ChapterCache chapterCache;
-    @Inject DatabaseHelper db;
-
-    @Bind(R.id.toolbar) Toolbar toolbar;
-
-    @Override
-    protected void onCreate(Bundle savedState) {
-        super.onCreate(savedState);
-        App.get(this).getComponent().inject(this);
-        setContentView(R.layout.activity_preferences);
-        ButterKnife.bind(this);
-
-        setupToolbar(toolbar);
-
-        if (savedState == null)
-            getFragmentManager().beginTransaction().replace(R.id.settings_content,
-                    new SettingsMainFragment())
-                    .commit();
-    }
-
-    @Override
-    public void onBackPressed() {
-        if( !getFragmentManager().popBackStackImmediate() ) super.onBackPressed();
-    }
-
-    public static class SettingsMainFragment extends PreferenceFragment {
-
-        @Override
-        public void onCreate(Bundle savedInstanceState) {
-            super.onCreate(savedInstanceState);
-            addPreferencesFromResource(R.xml.pref_main);
-
-            registerSubpreference(R.string.pref_category_general_key,
-                    SettingsGeneralFragment.newInstance(
-                            R.xml.pref_general, R.string.pref_category_general));
-
-            registerSubpreference(R.string.pref_category_reader_key,
-                    SettingsNestedFragment.newInstance(
-                            R.xml.pref_reader, R.string.pref_category_reader));
-
-            registerSubpreference(R.string.pref_category_downloads_key,
-                    SettingsDownloadsFragment.newInstance(
-                            R.xml.pref_downloads, R.string.pref_category_downloads));
-
-            registerSubpreference(R.string.pref_category_accounts_key,
-                    SettingsAccountsFragment.newInstance(
-                            R.xml.pref_accounts, R.string.pref_category_accounts));
-
-            registerSubpreference(R.string.pref_category_advanced_key,
-                    SettingsAdvancedFragment.newInstance(
-                            R.xml.pref_advanced, R.string.pref_category_advanced));
-
-            registerSubpreference(R.string.pref_category_about_key,
-                    SettingsAboutFragment.newInstance(
-                            R.xml.pref_about, R.string.pref_category_about));
-        }
-
-        @Override
-        public void onResume() {
-            super.onResume();
-            ((BaseActivity) getActivity()).setToolbarTitle(getString(R.string.label_settings));
-        }
-
-        private void registerSubpreference(int preferenceResource, PreferenceFragment fragment) {
-            findPreference(getString(preferenceResource))
-                    .setOnPreferenceClickListener(preference -> {
-                        getFragmentManager().beginTransaction()
-                                .replace(R.id.settings_content, fragment)
-                                .addToBackStack(fragment.getClass().getSimpleName()).commit();
-                        return true;
-                    });
-        }
-
-    }
-
-}

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsActivity.kt

@@ -0,0 +1,90 @@
+package eu.kanade.tachiyomi.ui.setting
+
+import android.os.Bundle
+import android.preference.PreferenceFragment
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.data.cache.ChapterCache
+import eu.kanade.tachiyomi.data.database.DatabaseHelper
+import eu.kanade.tachiyomi.data.mangasync.MangaSyncManager
+import eu.kanade.tachiyomi.data.preference.PreferencesHelper
+import eu.kanade.tachiyomi.data.source.SourceManager
+import eu.kanade.tachiyomi.ui.base.activity.BaseActivity
+import kotlinx.android.synthetic.main.toolbar.*
+import javax.inject.Inject
+
+class SettingsActivity : BaseActivity() {
+
+    @Inject lateinit var preferences: PreferencesHelper
+    @Inject lateinit var chapterCache: ChapterCache
+    @Inject lateinit var db: DatabaseHelper
+    @Inject lateinit var sourceManager: SourceManager
+    @Inject lateinit var syncManager: MangaSyncManager
+
+    override fun onCreate(savedState: Bundle?) {
+        super.onCreate(savedState)
+        setContentView(R.layout.activity_preferences)
+        applicationComponent.inject(this)
+
+        setupToolbar(toolbar)
+
+        if (savedState == null) {
+            fragmentManager.beginTransaction().replace(R.id.settings_content,
+                    SettingsMainFragment()).commit()
+        }
+    }
+
+    override fun onBackPressed() {
+        if (!fragmentManager.popBackStackImmediate()) {
+            super.onBackPressed()
+        }
+    }
+
+    class SettingsMainFragment : PreferenceFragment() {
+
+        override fun onCreate(savedInstanceState: Bundle?) {
+            super.onCreate(savedInstanceState)
+            addPreferencesFromResource(R.xml.pref_main)
+
+            registerSubpreference(R.string.pref_category_general_key,
+                    SettingsGeneralFragment.newInstance(
+                            R.xml.pref_general, R.string.pref_category_general))
+
+            registerSubpreference(R.string.pref_category_reader_key,
+                    SettingsNestedFragment.newInstance(
+                            R.xml.pref_reader, R.string.pref_category_reader))
+
+            registerSubpreference(R.string.pref_category_downloads_key,
+                    SettingsDownloadsFragment.newInstance(
+                            R.xml.pref_downloads, R.string.pref_category_downloads))
+
+            registerSubpreference(R.string.pref_category_accounts_key,
+                    SettingsAccountsFragment.newInstance(
+                            R.xml.pref_accounts, R.string.pref_category_accounts))
+
+            registerSubpreference(R.string.pref_category_advanced_key,
+                    SettingsAdvancedFragment.newInstance(
+                            R.xml.pref_advanced, R.string.pref_category_advanced))
+
+            registerSubpreference(R.string.pref_category_about_key,
+                    SettingsAboutFragment.newInstance(
+                            R.xml.pref_about, R.string.pref_category_about))
+        }
+
+        override fun onResume() {
+            super.onResume()
+            (activity as BaseActivity).setToolbarTitle(getString(R.string.label_settings))
+        }
+
+        private fun registerSubpreference(preferenceResource: Int, fragment: PreferenceFragment) {
+            findPreference(getString(preferenceResource)).setOnPreferenceClickListener {
+                fragmentManager.beginTransaction()
+                        .replace(R.id.settings_content, fragment)
+                        .addToBackStack(fragment.javaClass.simpleName)
+                        .commit()
+                true
+            }
+        }
+
+    }
+
+}

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsAdvancedFragment.java

@@ -1,109 +0,0 @@
-package eu.kanade.tachiyomi.ui.setting;
-
-import android.os.Bundle;
-import android.preference.Preference;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-
-import com.afollestad.materialdialogs.MaterialDialog;
-
-import java.io.File;
-import java.util.concurrent.atomic.AtomicInteger;
-
-import eu.kanade.tachiyomi.R;
-import eu.kanade.tachiyomi.data.cache.ChapterCache;
-import eu.kanade.tachiyomi.data.database.DatabaseHelper;
-import eu.kanade.tachiyomi.util.ToastUtil;
-import rx.Observable;
-import rx.android.schedulers.AndroidSchedulers;
-import rx.schedulers.Schedulers;
-import rx.subscriptions.CompositeSubscription;
-
-public class SettingsAdvancedFragment extends SettingsNestedFragment {
-
-    private CompositeSubscription subscriptions;
-
-    public static SettingsNestedFragment newInstance(int resourcePreference, int resourceTitle) {
-        SettingsNestedFragment fragment = new SettingsAdvancedFragment();
-        fragment.setArgs(resourcePreference, resourceTitle);
-        return fragment;
-    }
-
-    @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedState) {
-        View view = super.onCreateView(inflater, container, savedState);
-        subscriptions = new CompositeSubscription();
-
-        Preference clearCache = findPreference(getString(R.string.pref_clear_chapter_cache_key));
-        clearCache.setOnPreferenceClickListener(preference -> {
-            clearChapterCache(preference);
-            return true;
-        });
-        clearCache.setSummary(getString(R.string.used_cache, getChapterCache().getReadableSize()));
-
-        Preference clearDatabase = findPreference(getString(R.string.pref_clear_database_key));
-        clearDatabase.setOnPreferenceClickListener(preference -> {
-            clearDatabase();
-            return true;
-        });
-
-        return view;
-    }
-
-    @Override
-    public void onDestroyView() {
-        subscriptions.unsubscribe();
-        super.onDestroyView();
-    }
-
-    private void clearChapterCache(Preference preference) {
-        final ChapterCache chapterCache = getChapterCache();
-        final AtomicInteger deletedFiles = new AtomicInteger();
-
-        File[] files = chapterCache.getCacheDir().listFiles();
-
-        MaterialDialog dialog = new MaterialDialog.Builder(getActivity())
-                .title(R.string.deleting)
-                .progress(false, files.length, true)
-                .cancelable(false)
-                .show();
-
-        subscriptions.add(Observable.defer(() -> Observable.from(files))
-                .concatMap(file -> {
-                    if (chapterCache.removeFileFromCache(file.getName())) {
-                        deletedFiles.incrementAndGet();
-                    }
-                    return Observable.just(file);
-                })
-                .subscribeOn(Schedulers.io())
-                .observeOn(AndroidSchedulers.mainThread())
-                .subscribe(file -> dialog.incrementProgress(1),
-                        error -> {
-                            dialog.dismiss();
-                            ToastUtil.showShort(getActivity(), getString(R.string.cache_delete_error));
-                        }, () -> {
-                            dialog.dismiss();
-                            ToastUtil.showShort(getActivity(), getString(R.string.cache_deleted, deletedFiles.get()));
-                            preference.setSummary(getString(R.string.used_cache, chapterCache.getReadableSize()));
-                        }));
-    }
-
-    private void clearDatabase() {
-        final DatabaseHelper db = getSettingsActivity().db;
-
-        new MaterialDialog.Builder(getActivity())
-                .content(R.string.clear_database_confirmation)
-                .positiveText(R.string.button_yes)
-                .negativeText(R.string.button_no)
-                .onPositive((dialog1, which) -> {
-                    db.deleteMangasNotInLibrary().executeAsBlocking();
-                })
-                .show();
-    }
-
-    private ChapterCache getChapterCache() {
-        return getSettingsActivity().chapterCache;
-    }
-
-}

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsAdvancedFragment.kt

@@ -0,0 +1,100 @@
+package eu.kanade.tachiyomi.ui.setting
+
+import android.os.Bundle
+import android.preference.Preference
+import android.view.View
+import com.afollestad.materialdialogs.MaterialDialog
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.data.cache.ChapterCache
+import eu.kanade.tachiyomi.data.database.DatabaseHelper
+import eu.kanade.tachiyomi.util.ToastUtil
+import rx.Observable
+import rx.Subscription
+import rx.android.schedulers.AndroidSchedulers
+import rx.schedulers.Schedulers
+import java.util.concurrent.atomic.AtomicInteger
+
+class SettingsAdvancedFragment : SettingsNestedFragment() {
+
+    private var clearCacheSubscription: Subscription? = null
+
+    companion object {
+
+        fun newInstance(resourcePreference: Int, resourceTitle: Int): SettingsNestedFragment {
+            val fragment = SettingsAdvancedFragment()
+            fragment.setArgs(resourcePreference, resourceTitle)
+            return fragment
+        }
+    }
+
+    override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
+        val clearCache = findPreference(getString(R.string.pref_clear_chapter_cache_key))
+        val clearDatabase = findPreference(getString(R.string.pref_clear_database_key))
+
+        clearCache.setOnPreferenceClickListener { preference ->
+            clearChapterCache(preference)
+            true
+        }
+        clearCache.summary = getString(R.string.used_cache, chapterCache.readableSize)
+
+        clearDatabase.setOnPreferenceClickListener { preference ->
+            clearDatabase()
+            true
+        }
+    }
+
+    override fun onDestroyView() {
+        clearCacheSubscription?.unsubscribe()
+        super.onDestroyView()
+    }
+
+    private fun clearChapterCache(preference: Preference) {
+        val deletedFiles = AtomicInteger()
+
+        val files = chapterCache.cacheDir.listFiles()
+
+        val dialog = MaterialDialog.Builder(activity)
+                .title(R.string.deleting)
+                .progress(false, files.size, true)
+                .cancelable(false)
+                .show()
+
+        clearCacheSubscription?.unsubscribe()
+
+        clearCacheSubscription = Observable.defer { Observable.from(files) }
+                .concatMap { file ->
+                    if (chapterCache.removeFileFromCache(file.name)) {
+                        deletedFiles.incrementAndGet()
+                    }
+                    Observable.just(file)
+                }
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe({
+                    dialog.incrementProgress(1)
+                }, {
+                    dialog.dismiss()
+                    ToastUtil.showShort(activity, getString(R.string.cache_delete_error))
+                }, {
+                    dialog.dismiss()
+                    ToastUtil.showShort(activity, getString(R.string.cache_deleted, deletedFiles.get()))
+                    preference.summary = getString(R.string.used_cache, chapterCache.readableSize)
+                })
+    }
+
+    private fun clearDatabase() {
+        MaterialDialog.Builder(activity)
+                .content(R.string.clear_database_confirmation)
+                .positiveText(R.string.button_yes)
+                .negativeText(R.string.button_no)
+                .onPositive { dialog, which -> db.deleteMangasNotInLibrary().executeAsBlocking() }
+                .show()
+    }
+
+    private val chapterCache: ChapterCache
+        get() = settingsActivity.chapterCache
+
+    private val db: DatabaseHelper
+        get() = settingsActivity.db
+
+}

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsDownloadsFragment.java

@@ -1,101 +0,0 @@
-package eu.kanade.tachiyomi.ui.setting;
-
-import android.app.Activity;
-import android.content.Intent;
-import android.net.Uri;
-import android.os.Build;
-import android.os.Bundle;
-import android.preference.Preference;
-import android.support.v7.widget.RecyclerView;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-
-import com.nononsenseapps.filepicker.AbstractFilePickerFragment;
-import com.nononsenseapps.filepicker.FilePickerActivity;
-import com.nononsenseapps.filepicker.FilePickerFragment;
-import com.nononsenseapps.filepicker.LogicHandler;
-
-import java.io.File;
-
-import eu.kanade.tachiyomi.R;
-
-public class SettingsDownloadsFragment extends SettingsNestedFragment {
-
-    Preference downloadDirPref;
-
-    public static final int DOWNLOAD_DIR_CODE = 1;
-
-    public static SettingsNestedFragment newInstance(int resourcePreference, int resourceTitle) {
-        SettingsNestedFragment fragment = new SettingsDownloadsFragment();
-        fragment.setArgs(resourcePreference, resourceTitle);
-        return fragment;
-    }
-
-    @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
-        View view = super.onCreateView(inflater, container, savedInstanceState);
-
-        downloadDirPref = findPreference(getString(R.string.pref_download_directory_key));
-
-        downloadDirPref.setOnPreferenceClickListener(preference -> {
-            Intent i = new Intent(getActivity(), CustomLayoutPickerActivity.class);
-            i.putExtra(FilePickerActivity.EXTRA_ALLOW_MULTIPLE, false);
-            i.putExtra(FilePickerActivity.EXTRA_ALLOW_CREATE_DIR, true);
-            i.putExtra(FilePickerActivity.EXTRA_MODE, FilePickerActivity.MODE_DIR);
-            i.putExtra(FilePickerActivity.EXTRA_START_PATH, preferences.getDownloadsDirectory());
-
-            startActivityForResult(i, DOWNLOAD_DIR_CODE);
-            return true;
-        });
-        return view;
-    }
-
-    @Override
-    public void onResume() {
-        super.onResume();
-        downloadDirPref.setSummary(preferences.getDownloadsDirectory());
-    }
-
-    @Override
-    public void onActivityResult(int requestCode, int resultCode, Intent data) {
-        if (requestCode == DOWNLOAD_DIR_CODE && resultCode == Activity.RESULT_OK) {
-            Uri uri = data.getData();
-            preferences.setDownloadsDirectory(uri.getPath());
-
-            // Persist access permissions.
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
-                getActivity().getContentResolver().takePersistableUriPermission(uri,
-                        Intent.FLAG_GRANT_READ_URI_PERMISSION |
-                        Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
-            }
-        }
-    }
-
-    public static class CustomLayoutPickerActivity extends FilePickerActivity {
-
-        @Override
-        protected AbstractFilePickerFragment<File> getFragment(
-                String startPath, int mode, boolean allowMultiple, boolean allowCreateDir) {
-            AbstractFilePickerFragment<File> fragment = new CustomLayoutFilePickerFragment();
-            fragment.setArgs(startPath, mode, allowMultiple, allowCreateDir);
-            return fragment;
-        }
-    }
-
-    public static class CustomLayoutFilePickerFragment extends FilePickerFragment {
-        @Override
-        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
-            View v;
-            switch (viewType) {
-                case LogicHandler.VIEWTYPE_DIR:
-                    v = LayoutInflater.from(getActivity()).inflate(R.layout.listitem_dir,
-                            parent, false);
-                    return new DirViewHolder(v);
-                default:
-                    return super.onCreateViewHolder(parent, viewType);
-            }
-        }
-    }
-
-}

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsDownloadsFragment.kt

@@ -0,0 +1,78 @@
+package eu.kanade.tachiyomi.ui.setting
+
+import android.app.Activity
+import android.content.Intent
+import android.os.Bundle
+import android.support.v7.widget.RecyclerView
+import android.view.View
+import android.view.ViewGroup
+import com.nononsenseapps.filepicker.AbstractFilePickerFragment
+import com.nononsenseapps.filepicker.FilePickerActivity
+import com.nononsenseapps.filepicker.FilePickerFragment
+import com.nononsenseapps.filepicker.LogicHandler
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.util.inflate
+import java.io.File
+
+class SettingsDownloadsFragment : SettingsNestedFragment() {
+
+    val downloadDirPref by lazy { findPreference(getString(R.string.pref_download_directory_key)) }
+
+    companion object {
+
+        val DOWNLOAD_DIR_CODE = 103
+
+        fun newInstance(resourcePreference: Int, resourceTitle: Int): SettingsNestedFragment {
+            val fragment = SettingsDownloadsFragment()
+            fragment.setArgs(resourcePreference, resourceTitle)
+            return fragment
+        }
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        downloadDirPref.setOnPreferenceClickListener { preference ->
+            val i = Intent(activity, CustomLayoutPickerActivity::class.java)
+            i.putExtra(FilePickerActivity.EXTRA_ALLOW_MULTIPLE, false)
+            i.putExtra(FilePickerActivity.EXTRA_ALLOW_CREATE_DIR, true)
+            i.putExtra(FilePickerActivity.EXTRA_MODE, FilePickerActivity.MODE_DIR)
+            i.putExtra(FilePickerActivity.EXTRA_START_PATH, preferences.downloadsDirectory)
+
+            startActivityForResult(i, DOWNLOAD_DIR_CODE)
+            true
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        downloadDirPref.summary = preferences.downloadsDirectory
+    }
+
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        if (data != null && requestCode == DOWNLOAD_DIR_CODE && resultCode == Activity.RESULT_OK) {
+            preferences.downloadsDirectory = data.data.path
+        }
+    }
+
+    class CustomLayoutPickerActivity : FilePickerActivity() {
+
+        override fun getFragment(startPath: String?, mode: Int, allowMultiple: Boolean, allowCreateDir: Boolean):
+                AbstractFilePickerFragment<File> {
+            val fragment = CustomLayoutFilePickerFragment()
+            fragment.setArgs(startPath, mode, allowMultiple, allowCreateDir)
+            return fragment
+        }
+    }
+
+    class CustomLayoutFilePickerFragment : FilePickerFragment() {
+        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
+            when (viewType) {
+                LogicHandler.VIEWTYPE_DIR -> {
+                    val view = parent.inflate(R.layout.listitem_dir)
+                    return DirViewHolder(view)
+                }
+                else -> return super.onCreateViewHolder(parent, viewType)
+            }
+        }
+    }
+
+}

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsGeneralFragment.java

@@ -1,44 +0,0 @@
-package eu.kanade.tachiyomi.ui.setting;
-
-import android.os.Bundle;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-
-import eu.kanade.tachiyomi.R;
-import eu.kanade.tachiyomi.data.preference.PreferencesHelper;
-import eu.kanade.tachiyomi.data.library.LibraryUpdateAlarm;
-import eu.kanade.tachiyomi.widget.preference.IntListPreference;
-import eu.kanade.tachiyomi.widget.preference.LibraryColumnsDialog;
-
-public class SettingsGeneralFragment extends SettingsNestedFragment {
-
-    public static SettingsNestedFragment newInstance(int resourcePreference, int resourceTitle) {
-        SettingsNestedFragment fragment = new SettingsGeneralFragment();
-        fragment.setArgs(resourcePreference, resourceTitle);
-        return fragment;
-    }
-
-    @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedState) {
-        View view = super.onCreateView(inflater, container, savedState);
-
-        PreferencesHelper preferences = getSettingsActivity().preferences;
-
-        LibraryColumnsDialog columnsDialog = (LibraryColumnsDialog) findPreference(
-                getString(R.string.pref_library_columns_dialog_key));
-
-        columnsDialog.setPreferencesHelper(preferences);
-
-        IntListPreference updateInterval = (IntListPreference) findPreference(
-                getString(R.string.pref_library_update_interval_key));
-
-        updateInterval.setOnPreferenceChangeListener((preference, newValue) -> {
-            LibraryUpdateAlarm.startAlarm(getActivity(), Integer.parseInt((String) newValue));
-            return true;
-        });
-
-        return view;
-    }
-
-}

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsGeneralFragment.kt

@@ -0,0 +1,35 @@
+package eu.kanade.tachiyomi.ui.setting
+
+import android.os.Bundle
+import android.view.View
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.data.library.LibraryUpdateAlarm
+import eu.kanade.tachiyomi.widget.preference.IntListPreference
+import eu.kanade.tachiyomi.widget.preference.LibraryColumnsDialog
+
+class SettingsGeneralFragment : SettingsNestedFragment() {
+
+    companion object {
+        fun newInstance(resourcePreference: Int, resourceTitle: Int): SettingsGeneralFragment {
+            val fragment = SettingsGeneralFragment();
+            fragment.setArgs(resourcePreference, resourceTitle);
+            return fragment;
+        }
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        val columnsDialog = findPreference(
+                getString(R.string.pref_library_columns_dialog_key)) as LibraryColumnsDialog
+
+        columnsDialog.setPreferencesHelper(preferences)
+
+        val updateInterval = findPreference(
+                getString(R.string.pref_library_update_interval_key)) as IntListPreference
+
+        updateInterval.setOnPreferenceChangeListener { preference, newValue ->
+            LibraryUpdateAlarm.startAlarm(activity, (newValue as String).toInt())
+            true
+        }
+    }
+
+}

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsNestedFragment.java

@@ -1,55 +0,0 @@
-package eu.kanade.tachiyomi.ui.setting;
-
-import android.os.Bundle;
-import android.preference.PreferenceFragment;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-
-import eu.kanade.tachiyomi.data.preference.PreferencesHelper;
-import eu.kanade.tachiyomi.ui.base.activity.BaseActivity;
-
-public class SettingsNestedFragment extends PreferenceFragment {
-
-    protected PreferencesHelper preferences;
-
-    private static final String RESOURCE_FILE = "resource_file";
-    private static final String TOOLBAR_TITLE = "toolbar_title";
-
-    public static SettingsNestedFragment newInstance(int resourcePreference, int resourceTitle) {
-        SettingsNestedFragment fragment = new SettingsNestedFragment();
-        fragment.setArgs(resourcePreference, resourceTitle);
-        return fragment;
-    }
-
-    @Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        addPreferencesFromResource(getArguments().getInt(RESOURCE_FILE));
-    }
-
-    @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
-        preferences = getSettingsActivity().preferences;
-        return super.onCreateView(inflater, container, savedInstanceState);
-    }
-
-    @Override
-    public void onResume() {
-        super.onResume();
-        ((BaseActivity) getActivity())
-                .setToolbarTitle(getString(getArguments().getInt(TOOLBAR_TITLE)));
-    }
-
-    public void setArgs(int resourcePreference, int resourceTitle) {
-        Bundle args = new Bundle();
-        args.putInt(RESOURCE_FILE, resourcePreference);
-        args.putInt(TOOLBAR_TITLE, resourceTitle);
-        setArguments(args);
-    }
-
-    public SettingsActivity getSettingsActivity() {
-        return (SettingsActivity) getActivity();
-    }
-
-}

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsNestedFragment.kt

@@ -0,0 +1,44 @@
+package eu.kanade.tachiyomi.ui.setting
+
+import android.os.Bundle
+import android.preference.PreferenceFragment
+import eu.kanade.tachiyomi.data.preference.PreferencesHelper
+
+open class SettingsNestedFragment : PreferenceFragment() {
+
+    companion object {
+
+        private val RESOURCE_FILE = "resource_file"
+        private val TOOLBAR_TITLE = "toolbar_title"
+
+        fun newInstance(resourcePreference: Int, resourceTitle: Int): SettingsNestedFragment {
+            val fragment = SettingsNestedFragment()
+            fragment.setArgs(resourcePreference, resourceTitle)
+            return fragment
+        }
+
+    }
+
+    override fun onCreate(savedState: Bundle?) {
+        super.onCreate(savedState)
+        addPreferencesFromResource(arguments.getInt(RESOURCE_FILE))
+    }
+
+    override fun onResume() {
+        super.onResume()
+        settingsActivity.setToolbarTitle(getString(arguments.getInt(TOOLBAR_TITLE)))
+    }
+
+    fun setArgs(resourcePreference: Int, resourceTitle: Int) {
+        val args = Bundle()
+        args.putInt(RESOURCE_FILE, resourcePreference)
+        args.putInt(TOOLBAR_TITLE, resourceTitle)
+        arguments = args
+    }
+
+    val settingsActivity: SettingsActivity
+        get() = activity as SettingsActivity
+
+    val preferences: PreferencesHelper
+        get() = settingsActivity.preferences
+}