diff --git a/app/src/main/java/com/hippo/ehviewer/EhApplication.kt b/app/src/main/java/com/hippo/ehviewer/EhApplication.kt
index 71c005a45..399d0b02d 100644
--- a/app/src/main/java/com/hippo/ehviewer/EhApplication.kt
+++ b/app/src/main/java/com/hippo/ehviewer/EhApplication.kt
@@ -16,7 +16,6 @@
 package com.hippo.ehviewer
 
 import android.app.Activity
-import android.content.ComponentCallbacks2
 import android.text.Html
 import android.text.method.LinkMovementMethod
 import android.view.View
@@ -29,7 +28,6 @@ import coil.ImageLoaderFactory
 import coil.disk.DiskCache
 import coil.util.DebugLogger
 import com.hippo.ehviewer.client.EhCookieStore
-import com.hippo.ehviewer.client.EhDns
 import com.hippo.ehviewer.client.EhEngine
 import com.hippo.ehviewer.client.EhTagDatabase
 import com.hippo.ehviewer.client.data.GalleryDetail
@@ -165,13 +163,6 @@ class EhApplication : SceneApplication(), ImageLoaderFactory {
         }
     }
 
-    override fun onTrimMemory(level: Int) {
-        super.onTrimMemory(level)
-        if (level >= ComponentCallbacks2.TRIM_MEMORY_RUNNING_LOW) {
-            galleryDetailCache.evictAll()
-        }
-    }
-
     fun putGlobalStuff(o: Any): Int {
         val id = mIdGenerator.nextId()
         mGlobalStuffMap[id] = o
@@ -220,11 +211,11 @@ class EhApplication : SceneApplication(), ImageLoaderFactory {
         val nonCacheOkHttpClient by lazy {
             OkHttpClient.Builder().apply {
                 cookieJar(EhCookieStore)
-                dns(EhDns)
                 proxySelector(ehProxySelector)
                 addInterceptor(CloudflareInterceptor(application))
             }.build()
         }
+
         val noRedirectOkHttpClient by lazy {
             nonCacheOkHttpClient.newBuilder()
                 .followRedirects(false)
@@ -246,8 +237,6 @@ class EhApplication : SceneApplication(), ImageLoaderFactory {
             }
         }
 
-        val hosts by lazy { Hosts(application, "hosts.db") }
-
         val favouriteStatusRouter by lazy { FavouriteStatusRouter() }
 
         val ehDatabase by lazy { buildMainDB(application) }
diff --git a/app/src/main/java/com/hippo/ehviewer/Hosts.java b/app/src/main/java/com/hippo/ehviewer/Hosts.java
deleted file mode 100644
index 0b0dc7e5c..000000000
--- a/app/src/main/java/com/hippo/ehviewer/Hosts.java
+++ /dev/null
@@ -1,342 +0,0 @@
-/*
- * Copyright 2018 Hippo Seven
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.hippo.ehviewer;
-
-/*
- * Created by Hippo on 2018/3/21.
- */
-
-import android.content.ContentValues;
-import android.content.Context;
-import android.database.Cursor;
-import android.database.sqlite.SQLiteDatabase;
-import android.database.sqlite.SQLiteOpenHelper;
-import android.util.Pair;
-
-import androidx.annotation.Nullable;
-
-import com.hippo.database.MSQLiteBuilder;
-import com.hippo.util.SqlUtils;
-
-import java.net.InetAddress;
-import java.net.UnknownHostException;
-import java.util.ArrayList;
-import java.util.List;
-
-public class Hosts {
-    private static final int VERSION_1 = 1;
-    private static final String TABLE_HOSTS = "HOSTS";
-    private static final String COLUMN_HOST = "HOST";
-    private static final String COLUMN_IP = "IP";
-
-    private static final int DB_VERSION = VERSION_1;
-
-    private final SQLiteDatabase db;
-
-    public Hosts(Context context, String name) {
-        SQLiteOpenHelper helper = new MSQLiteBuilder()
-                .version(VERSION_1)
-                .createTable(TABLE_HOSTS)
-                .insertColumn(TABLE_HOSTS, COLUMN_HOST, String.class)
-                .insertColumn(TABLE_HOSTS, COLUMN_IP, String.class)
-                .build(context, name, DB_VERSION);
-        db = helper.getWritableDatabase();
-    }
-
-    @Nullable
-    public static InetAddress toInetAddress(String host, String ip) {
-        if (!isValidHost(host)) {
-            return null;
-        }
-
-        if (ip == null) {
-            return null;
-        }
-
-        byte[] bytes = parseV4(ip);
-        if (bytes == null) {
-            bytes = parseV6(ip);
-        }
-        if (bytes == null) {
-            return null;
-        }
-
-        try {
-            return InetAddress.getByAddress(host, bytes);
-        } catch (UnknownHostException e) {
-            return null;
-        }
-    }
-
-    /**
-     * Returns true if the host is valid.
-     */
-    public static boolean isValidHost(String host) {
-        if (host == null) {
-            return false;
-        }
-
-        if (host.length() > 253) {
-            return false;
-        }
-
-        int labelLength = 0;
-        for (int i = 0, n = host.length(); i < n; i++) {
-            char ch = host.charAt(i);
-
-            if (ch == '.') {
-                if (labelLength < 1 || labelLength > 63) {
-                    return false;
-                }
-                labelLength = 0;
-            } else {
-                labelLength++;
-            }
-
-            if ((ch < 'a' || ch > 'z') && (ch < '0' || ch > '9') && ch != '-' && ch != '.') {
-                return false;
-            }
-        }
-
-        return labelLength >= 1 && labelLength <= 63;
-    }
-
-    /**
-     * Returns true if ips are valid.
-     */
-    public static boolean isValidIp(String ips) {
-        if (ips == null) {
-            return false;
-        }
-        String[] list = ips.split("\\+");
-        for (String ip : list) {
-            if (parseV4(ip) == null && parseV6(ip) == null) {
-                return false;
-            }
-        }
-        return true;
-    }
-
-    // org.xbill.DNS.Address.parseV4
-    @Nullable
-    private static byte[] parseV4(String s) {
-        int numDigits;
-        int currentOctet;
-        byte[] values = new byte[4];
-        int currentValue;
-        int length = s.length();
-
-        currentOctet = 0;
-        currentValue = 0;
-        numDigits = 0;
-        for (int i = 0; i < length; i++) {
-            char c = s.charAt(i);
-            if (c >= '0' && c <= '9') {
-                /* Can't have more than 3 digits per octet. */
-                if (numDigits == 3)
-                    return null;
-                /* Octets shouldn't start with 0, unless they are 0. */
-                if (numDigits > 0 && currentValue == 0)
-                    return null;
-                numDigits++;
-                currentValue *= 10;
-                currentValue += (c - '0');
-                /* 255 is the maximum value for an octet. */
-                if (currentValue > 255)
-                    return null;
-            } else if (c == '.') {
-                /* Can't have more than 3 dots. */
-                if (currentOctet == 3)
-                    return null;
-                /* Two consecutive dots are bad. */
-                if (numDigits == 0)
-                    return null;
-                values[currentOctet++] = (byte) currentValue;
-                currentValue = 0;
-                numDigits = 0;
-            } else
-                return null;
-        }
-        /* Must have 4 octets. */
-        if (currentOctet != 3)
-            return null;
-        /* The fourth octet can't be empty. */
-        if (numDigits == 0)
-            return null;
-        values[currentOctet] = (byte) currentValue;
-        return values;
-    }
-
-    // org.xbill.DNS.Address.parseV6
-    @Nullable
-    private static byte[] parseV6(String s) {
-        int range = -1;
-        byte[] data = new byte[16];
-
-        String[] tokens = s.split(":", -1);
-
-        int first = 0;
-        int last = tokens.length - 1;
-
-        if (tokens[0].length() == 0) {
-            // If the first two tokens are empty, it means the string
-            // started with ::, which is fine.  If only the first is
-            // empty, the string started with :, which is bad.
-            if (last - first > 0 && tokens[1].length() == 0)
-                first++;
-            else
-                return null;
-        }
-
-        if (tokens[last].length() == 0) {
-            // If the last two tokens are empty, it means the string
-            // ended with ::, which is fine.  If only the last is
-            // empty, the string ended with :, which is bad.
-            if (last - first > 0 && tokens[last - 1].length() == 0)
-                last--;
-            else
-                return null;
-        }
-
-        if (last - first + 1 > 8)
-            return null;
-
-        int i, j;
-        for (i = first, j = 0; i <= last; i++) {
-            if (tokens[i].length() == 0) {
-                if (range >= 0)
-                    return null;
-                range = j;
-                continue;
-            }
-
-            if (tokens[i].indexOf('.') >= 0) {
-                // An IPv4 address must be the last component
-                if (i < last)
-                    return null;
-                // There can't have been more than 6 components.
-                if (i > 6)
-                    return null;
-                byte[] v4addr = parseV4(tokens[i]);
-                if (v4addr == null)
-                    return null;
-                for (int k = 0; k < 4; k++)
-                    data[j++] = v4addr[k];
-                break;
-            }
-
-            try {
-                for (int k = 0; k < tokens[i].length(); k++) {
-                    char c = tokens[i].charAt(k);
-                    if (Character.digit(c, 16) < 0)
-                        return null;
-                }
-                int x = Integer.parseInt(tokens[i], 16);
-                if (x > 0xFFFF || x < 0)
-                    return null;
-                data[j++] = (byte) (x >>> 8);
-                data[j++] = (byte) (x & 0xFF);
-            } catch (NumberFormatException e) {
-                return null;
-            }
-        }
-
-        if (j < 16 && range < 0)
-            return null;
-
-        if (range >= 0) {
-            int empty = 16 - j;
-            System.arraycopy(data, range, data, range + empty, j - range);
-            for (i = range; i < range + empty; i++)
-                data[i] = 0;
-        }
-
-        return data;
-    }
-
-    /**
-     * Gets a InetAddress with the host.
-     */
-    @Nullable
-    public List<InetAddress> get(String host) {
-        if (!isValidHost(host)) {
-            return null;
-        }
-        try (Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_HOSTS + " WHERE " + COLUMN_HOST + " = ?;", new String[]{host})) {
-            if (cursor.moveToNext()) {
-                String[] ips = SqlUtils.getString(cursor, COLUMN_IP, null).split("\\+");
-                List<InetAddress> addresses = new ArrayList<>();
-                for (String ip : ips) {
-                    addresses.add(toInetAddress(host, ip));
-                }
-                return addresses;
-            } else {
-                return null;
-            }
-        }
-    }
-
-    private boolean contains(String host) {
-        try (Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_HOSTS + " WHERE " + COLUMN_HOST + " = ?;", new String[]{host})) {
-            return cursor.moveToNext();
-        }
-    }
-
-    /**
-     * Puts the host-ip pair into this hosts.
-     */
-    public boolean put(String host, String ip) {
-        if (!isValidHost(host) || !isValidIp(ip)) {
-            return false;
-        }
-
-        ContentValues values = new ContentValues();
-        values.put(COLUMN_HOST, host);
-        values.put(COLUMN_IP, ip);
-
-        if (contains(host)) {
-            db.update(TABLE_HOSTS, values, COLUMN_HOST + " = ?", new String[]{host});
-        } else {
-            db.insert(TABLE_HOSTS, null, values);
-        }
-
-        return true;
-    }
-
-    /**
-     * Puts delete the entry with the host.
-     */
-    public void delete(String host) {
-        db.delete(TABLE_HOSTS, COLUMN_HOST + " = ?", new String[]{host});
-    }
-
-    /**
-     * Get all data from this host.
-     */
-    public List<Pair<String, String>> getAll() {
-        List<Pair<String, String>> result = new ArrayList<>();
-
-        try (Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_HOSTS + ";", null)) {
-            while (cursor.moveToNext()) {
-                String host = SqlUtils.getString(cursor, COLUMN_HOST, null);
-                String ip = SqlUtils.getString(cursor, COLUMN_IP, null);
-                result.add(new Pair<>(host, ip));
-            }
-        }
-        return result;
-    }
-}
diff --git a/app/src/main/java/com/hippo/ehviewer/Settings.kt b/app/src/main/java/com/hippo/ehviewer/Settings.kt
index 173758281..a6cd47fd8 100644
--- a/app/src/main/java/com/hippo/ehviewer/Settings.kt
+++ b/app/src/main/java/com/hippo/ehviewer/Settings.kt
@@ -176,8 +176,6 @@ object Settings {
     private val DEFAULT_PROXY_IP: String? = null
     private const val KEY_PROXY_PORT = "proxy_port"
     private const val DEFAULT_PROXY_PORT = -1
-    private const val KEY_BUILT_IN_HOSTS = "built_in_hosts_2"
-    private const val DEFAULT_BUILT_IN_HOSTS = false
     private const val KEY_USER_AGENT = "user_agent"
     private const val KEY_APP_LINK_VERIFY_TIP = "app_link_verify_tip"
     private const val DEFAULT_APP_LINK_VERIFY_TIP = false
@@ -663,9 +661,6 @@ object Settings {
         putInt(KEY_PROXY_PORT, value)
     }
 
-    val builtInHosts: Boolean
-        get() = getBoolean(KEY_BUILT_IN_HOSTS, DEFAULT_BUILT_IN_HOSTS)
-
     val userAgent: String?
         get() = getString(KEY_USER_AGENT, CHROME_USER_AGENT)
     fun putUserAgent(value: String?) {
diff --git a/app/src/main/java/com/hippo/ehviewer/client/EhDns.kt b/app/src/main/java/com/hippo/ehviewer/client/EhDns.kt
deleted file mode 100644
index 2eac37a7b..000000000
--- a/app/src/main/java/com/hippo/ehviewer/client/EhDns.kt
+++ /dev/null
@@ -1,140 +0,0 @@
-/*
- * Copyright 2018 Hippo Seven
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.hippo.ehviewer.client
-
-import com.hippo.ehviewer.EhApplication
-import com.hippo.ehviewer.Hosts
-import com.hippo.ehviewer.Settings
-import okhttp3.Dns
-import java.net.InetAddress
-import java.net.UnknownHostException
-
-object EhDns : Dns {
-    private val hosts = EhApplication.hosts
-    private val builtInHosts: MutableMap<String, List<InetAddress>> = mutableMapOf()
-
-    init {
-        /* Pair(ip: String!, blockedByCCP: Boolean!) */
-        val ehHosts = arrayOf(
-            Pair("104.20.18.168", false),
-            Pair("104.20.19.168", false),
-            Pair("172.67.2.238", false),
-        )
-        val ehgtHosts = arrayOf(
-            Pair("81.171.10.48", false),
-            Pair("178.162.139.24", false),
-            Pair("62.112.8.21", false),
-            Pair("89.39.106.43", false),
-            Pair("109.236.85.28", false),
-            Pair("2a00:7c80:0:123::3a85", false),
-            Pair("2a00:7c80:0:12d::38a1", false),
-            Pair("2a00:7c80:0:13b::37a4", false),
-        )
-        val exHosts = arrayOf(
-            Pair("178.175.128.251", false),
-            Pair("178.175.128.252", false),
-            Pair("178.175.128.253", false),
-            Pair("178.175.128.254", false),
-            Pair("178.175.129.251", false),
-            Pair("178.175.129.252", false),
-            Pair("178.175.129.253", false),
-            Pair("178.175.129.254", false),
-            Pair("178.175.132.19", false),
-            Pair("178.175.132.20", false),
-            Pair("178.175.132.21", false),
-            Pair("178.175.132.22", false),
-        )
-
-        put(
-            "e-hentai.org",
-            *ehHosts,
-        )
-        put(
-            "forums.e-hentai.org",
-            *ehHosts,
-        )
-        put(
-            "repo.e-hentai.org",
-            *ehHosts,
-        )
-        put(
-            "api.e-hentai.org",
-            *ehHosts,
-            Pair("5.79.104.110", false),
-            Pair("37.48.81.204", false),
-            Pair("37.48.92.161", false),
-            Pair("212.7.200.104", false),
-            Pair("212.7.202.51", false),
-        )
-        put(
-            "ehgt.org",
-            *ehgtHosts,
-        )
-        put(
-            "gt0.ehgt.org",
-            *ehgtHosts,
-        )
-        put(
-            "gt1.ehgt.org",
-            *ehgtHosts,
-        )
-        put(
-            "gt2.ehgt.org",
-            *ehgtHosts,
-        )
-        put(
-            "gt3.ehgt.org",
-            *ehgtHosts,
-        )
-        put(
-            "ul.ehgt.org",
-            *ehgtHosts,
-        )
-
-        put(
-            "exhentai.org",
-            *exHosts,
-        )
-        put(
-            "s.exhentai.org",
-            *exHosts,
-        )
-
-        put(
-            "raw.githubusercontent.com",
-            Pair("151.101.0.133", false),
-            Pair("151.101.64.133", false),
-            Pair("151.101.128.133", false),
-            Pair("151.101.192.133", false),
-        )
-    }
-
-    private fun put(
-        host: String,
-        vararg ips: Pair<String, Boolean>,
-    ) {
-        builtInHosts[host] = ips.mapNotNull { pair ->
-            Hosts.toInetAddress(host, pair.first)
-        }
-    }
-
-    @Throws(UnknownHostException::class)
-    override fun lookup(hostname: String): List<InetAddress> {
-        val address = hosts[hostname] ?: builtInHosts[hostname].takeIf { Settings.builtInHosts }
-            ?: Dns.SYSTEM.lookup(hostname)
-        return address.shuffled()
-    }
-}
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/EhActivity.kt b/app/src/main/java/com/hippo/ehviewer/ui/EhActivity.kt
index 239fb5716..68f7bf34a 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/EhActivity.kt
+++ b/app/src/main/java/com/hippo/ehviewer/ui/EhActivity.kt
@@ -50,6 +50,7 @@ abstract class EhActivity : AppCompatActivity() {
         theme.applyStyle(getThemeStyleRes(), true)
     }
 
+    @Suppress("DEPRECATION")
     override fun onCreate(savedInstanceState: Bundle?) {
         layoutInflater.factory2 =
             LayoutInflaterFactory(delegate).addOnViewCreatedListener(WindowInsetsHelper.LISTENER)
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/fragment/BasePreferenceFragment.kt b/app/src/main/java/com/hippo/ehviewer/ui/fragment/BasePreferenceFragment.kt
index 0b6cc47bd..f542a4c43 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/fragment/BasePreferenceFragment.kt
+++ b/app/src/main/java/com/hippo/ehviewer/ui/fragment/BasePreferenceFragment.kt
@@ -60,7 +60,6 @@ open class BasePreferenceFragment :
             "mytags" -> MyTagsFragment()
             "filter" -> FilterFragment()
             "security" -> SetSecurityFragment()
-            "hosts" -> HostsFragment()
             else -> null
         }
         fragment?.let {
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/fragment/HostsFragment.kt b/app/src/main/java/com/hippo/ehviewer/ui/fragment/HostsFragment.kt
deleted file mode 100644
index c23c4b5c5..000000000
--- a/app/src/main/java/com/hippo/ehviewer/ui/fragment/HostsFragment.kt
+++ /dev/null
@@ -1,244 +0,0 @@
-/*
- * Copyright 2022 Tarsin Norbin
- *
- * This file is part of EhViewer
- *
- * EhViewer is free software: you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * EhViewer is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along with EhViewer.
- * If not, see <https://www.gnu.org/licenses/>.
- */
-package com.hippo.ehviewer.ui.fragment
-
-import android.annotation.SuppressLint
-import android.app.Dialog
-import android.content.DialogInterface
-import android.os.Bundle
-import android.util.Pair
-import android.view.LayoutInflater
-import android.view.View
-import android.view.ViewGroup
-import android.widget.TextView
-import androidx.appcompat.app.AlertDialog
-import androidx.fragment.app.DialogFragment
-import androidx.recyclerview.widget.LinearLayoutManager
-import androidx.recyclerview.widget.RecyclerView
-import com.google.android.material.floatingactionbutton.FloatingActionButton
-import com.google.android.material.textfield.TextInputLayout
-import com.hippo.easyrecyclerview.EasyRecyclerView
-import com.hippo.easyrecyclerview.LinearDividerItemDecoration
-import com.hippo.ehviewer.EhApplication
-import com.hippo.ehviewer.Hosts
-import com.hippo.ehviewer.R
-import com.hippo.view.ViewTransition
-import com.hippo.yorozuya.LayoutUtils
-import com.hippo.yorozuya.ViewUtils
-import rikka.core.res.resolveColor
-
-class HostsFragment : BaseFragment(), View.OnClickListener {
-    private var hosts: Hosts? = null
-    private var data: List<Pair<String, String>>? = null
-    private var mViewTransition: ViewTransition? = null
-    private var adapter: HostsAdapter? = null
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        EhApplication.hosts.apply {
-            hosts = this
-            data = all
-        }
-    }
-
-    override fun onCreateView(
-        inflater: LayoutInflater,
-        container: ViewGroup?,
-        savedInstanceState: Bundle?,
-    ): View? {
-        val view = inflater.inflate(R.layout.activity_hosts, container, false)
-        val recyclerView: RecyclerView = view.findViewById<EasyRecyclerView>(R.id.recycler_view)
-        val tip = ViewUtils.`$$`(view, R.id.tip) as TextView
-        mViewTransition = ViewTransition(recyclerView, tip)
-        val fab = view.findViewById<FloatingActionButton>(R.id.fab)
-        adapter = HostsAdapter()
-        recyclerView.adapter = adapter
-        recyclerView.layoutManager =
-            LinearLayoutManager(requireActivity(), RecyclerView.VERTICAL, false)
-        val decoration = LinearDividerItemDecoration(
-            LinearDividerItemDecoration.VERTICAL,
-            requireActivity().theme.resolveColor(R.attr.dividerColor),
-            LayoutUtils.dp2pix(requireActivity(), 1f),
-        )
-        decoration.setShowLastDivider(true)
-        recyclerView.addItemDecoration(decoration)
-        recyclerView.setHasFixedSize(true)
-        fab.setOnClickListener(this)
-        return view
-    }
-
-    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-        super.onViewCreated(view, savedInstanceState)
-        updateView(false)
-    }
-
-    fun onItemClick(position: Int): Boolean {
-        val pair = data!![position]
-        val args = Bundle()
-        args.putString(KEY_HOST, pair.first)
-        args.putString(KEY_IP, pair.second)
-        val fragment: DialogFragment = EditHostDialogFragment()
-        fragment.arguments = args
-        fragment.show(childFragmentManager, DIALOG_TAG_EDIT_HOST)
-        return true
-    }
-
-    override fun onClick(v: View) {
-        AddHostDialogFragment().show(childFragmentManager, DIALOG_TAG_ADD_HOST)
-    }
-
-    @SuppressLint("NotifyDataSetChanged")
-    private fun updateView(animation: Boolean) {
-        if (null == mViewTransition) {
-            return
-        }
-        data = hosts!!.all
-        if ((data as MutableList<Pair<String, String>>?)?.isEmpty() == true) {
-            mViewTransition!!.showView(1, animation)
-        } else {
-            mViewTransition!!.showView(0, animation)
-        }
-        adapter!!.notifyDataSetChanged()
-    }
-
-    override fun getFragmentTitle(): Int {
-        return R.string.hosts
-    }
-
-    abstract class HostDialogFragment : DialogFragment() {
-        private var hostsFragment: HostsFragment? = null
-        override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
-            hostsFragment = parentFragment as HostsFragment?
-            val view = layoutInflater.inflate(R.layout.dialog_hosts, null, false)
-            val host = view.findViewById<TextView>(R.id.host)
-            val ip = view.findViewById<TextView>(R.id.ip)
-            val arguments = arguments
-            if (savedInstanceState == null && arguments != null) {
-                host.text = arguments.getString(KEY_HOST)
-                ip.text = arguments.getString(KEY_IP)
-            }
-            val builder = AlertDialog.Builder(requireContext())
-            builder.setView(view)
-            onCreateDialogBuilder(builder)
-            val dialog = builder.create()
-            dialog.setOnShowListener { d: DialogInterface -> onCreateDialog(d as AlertDialog) }
-            return dialog
-        }
-
-        protected abstract fun onCreateDialogBuilder(builder: AlertDialog.Builder)
-        protected abstract fun onCreateDialog(dialog: AlertDialog)
-        protected fun put(dialog: AlertDialog) {
-            val host = dialog.findViewById<TextView>(R.id.host)
-            val ip = dialog.findViewById<TextView>(R.id.ip)
-            if (host == null || ip == null) {
-                return
-            }
-            val hostString = host.text.toString().trim { it <= ' ' }.lowercase()
-            val ipString = ip.text.toString().trim { it <= ' ' }
-            if (!Hosts.isValidHost(hostString)) {
-                val hostInputLayout =
-                    dialog.findViewById<TextInputLayout>(R.id.host_input_layout) ?: return
-                hostInputLayout.error = getString(R.string.invalid_host)
-                return
-            }
-            if (!Hosts.isValidIp(ipString)) {
-                val ipInputLayout =
-                    dialog.findViewById<TextInputLayout>(R.id.ip_input_layout) ?: return
-                ipInputLayout.error = getString(R.string.invalid_ip)
-                return
-            }
-            hostsFragment!!.hosts!!.put(hostString, ipString)
-            hostsFragment!!.updateView(true)
-            dialog.dismiss()
-        }
-
-        protected fun delete(dialog: AlertDialog) {
-            val host = dialog.findViewById<TextView>(R.id.host) ?: return
-            val hostString = host.text.toString().trim { it <= ' ' }.lowercase()
-            hostsFragment!!.hosts!!.delete(hostString)
-            hostsFragment!!.updateView(true)
-            dialog.dismiss()
-        }
-    }
-
-    class AddHostDialogFragment : HostDialogFragment() {
-        override fun onCreateDialogBuilder(builder: AlertDialog.Builder) {
-            builder.setTitle(R.string.add_host)
-            builder.setPositiveButton(R.string.add_host_add, null)
-            builder.setNegativeButton(android.R.string.cancel, null)
-        }
-
-        override fun onCreateDialog(dialog: AlertDialog) {
-            dialog.getButton(DialogInterface.BUTTON_POSITIVE)
-                .setOnClickListener { put(dialog) }
-        }
-    }
-
-    class EditHostDialogFragment : HostDialogFragment() {
-        override fun onCreateDialogBuilder(builder: AlertDialog.Builder) {
-            builder.setTitle(R.string.edit_host)
-            builder.setPositiveButton(R.string.edit_host_confirm, null)
-            builder.setNegativeButton(R.string.edit_host_delete, null)
-        }
-
-        override fun onCreateDialog(dialog: AlertDialog) {
-            val hostInputLayout =
-                dialog.findViewById<TextInputLayout>(R.id.host_input_layout) ?: return
-            hostInputLayout.isEnabled = false
-            dialog.getButton(DialogInterface.BUTTON_POSITIVE)
-                .setOnClickListener { put(dialog) }
-            dialog.getButton(DialogInterface.BUTTON_NEGATIVE)
-                .setOnClickListener { delete(dialog) }
-        }
-    }
-
-    private class HostsHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
-        val host: TextView
-        val ip: TextView
-
-        init {
-            host = itemView.findViewById(R.id.host)
-            ip = itemView.findViewById(R.id.ip)
-        }
-    }
-
-    private inner class HostsAdapter : RecyclerView.Adapter<HostsHolder>() {
-        private val inflater = layoutInflater
-        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): HostsHolder {
-            return HostsHolder(inflater.inflate(R.layout.item_hosts, parent, false))
-        }
-
-        override fun onBindViewHolder(holder: HostsHolder, position: Int) {
-            val pair = data!![position]
-            holder.host.text = pair.first
-            holder.ip.text = pair.second
-            holder.itemView.setOnClickListener { onItemClick(position) }
-        }
-
-        override fun getItemCount(): Int {
-            return data!!.size
-        }
-    }
-
-    companion object {
-        private val DIALOG_TAG_ADD_HOST = AddHostDialogFragment::class.java.name
-        private val DIALOG_TAG_EDIT_HOST = EditHostDialogFragment::class.java.name
-        private const val KEY_HOST = "com.hippo.ehviewer.ui.fragment.HostsFragment.HOST"
-        private const val KEY_IP = "com.hippo.ehviewer.ui.fragment.HostsFragment.IP"
-    }
-}
diff --git a/app/src/main/res/layout/activity_hosts.xml b/app/src/main/res/layout/activity_hosts.xml
deleted file mode 100644
index c92eb36ab..000000000
--- a/app/src/main/res/layout/activity_hosts.xml
+++ /dev/null
@@ -1,52 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?><!--
-  ~ Copyright 2018 Hippo Seven
-  ~
-  ~ Licensed under the Apache License, Version 2.0 (the "License");
-  ~ you may not use this file except in compliance with the License.
-  ~ You may obtain a copy of the License at
-  ~
-  ~     http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing, software
-  ~ distributed under the License is distributed on an "AS IS" BASIS,
-  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  ~ See the License for the specific language governing permissions and
-  ~ limitations under the License.
-  -->
-
-<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical">
-
-    <com.hippo.easyrecyclerview.EasyRecyclerView
-        android:id="@+id/recycler_view"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:clipToPadding="false"
-        android:paddingBottom="@dimen/fab_rv_padding_size"
-        app:fitsSystemWindowsInsets="bottom" />
-
-    <TextView
-        android:id="@+id/tip"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_gravity="center"
-        android:gravity="center"
-        android:text="@string/hosts_tip"
-        android:textSize="@dimen/text_super_large"
-        app:fitsSystemWindowsInsets="bottom" />
-
-    <com.google.android.material.floatingactionbutton.FloatingActionButton
-        android:id="@+id/fab"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_gravity="bottom|end"
-        android:layout_marginEnd="@dimen/corner_fab_margin"
-        android:layout_marginBottom="@dimen/corner_fab_margin"
-        app:layout_fitsSystemWindowsInsets="bottom"
-        app:srcCompat="@drawable/v_plus_dark_x24"
-        style="@style/Widget.FloatingActionButton" />
-
-</FrameLayout>
diff --git a/app/src/main/res/layout/dialog_hosts.xml b/app/src/main/res/layout/dialog_hosts.xml
deleted file mode 100644
index 96770d046..000000000
--- a/app/src/main/res/layout/dialog_hosts.xml
+++ /dev/null
@@ -1,53 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?><!--
-  ~ Copyright 2018 Hippo Seven
-  ~
-  ~ Licensed under the Apache License, Version 2.0 (the "License");
-  ~ you may not use this file except in compliance with the License.
-  ~ You may obtain a copy of the License at
-  ~
-  ~     http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing, software
-  ~ distributed under the License is distributed on an "AS IS" BASIS,
-  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  ~ See the License for the specific language governing permissions and
-  ~ limitations under the License.
-  -->
-
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:paddingHorizontal="?attr/dialogPreferredPadding"
-    android:paddingTop="@dimen/abc_dialog_padding_top_material">
-
-    <com.google.android.material.textfield.TextInputLayout
-        android:id="@+id/host_input_layout"
-        style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:hint="@string/hosts_host">
-
-        <com.google.android.material.textfield.TextInputEditText
-            android:id="@+id/host"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:inputType="text" />
-
-    </com.google.android.material.textfield.TextInputLayout>
-
-    <com.google.android.material.textfield.TextInputLayout
-        android:id="@+id/ip_input_layout"
-        style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:hint="@string/hosts_ip">
-
-        <com.google.android.material.textfield.TextInputEditText
-            android:id="@+id/ip"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:inputType="text" />
-
-    </com.google.android.material.textfield.TextInputLayout>
-</LinearLayout>
diff --git a/app/src/main/res/values-ja/strings.xml b/app/src/main/res/values-ja/strings.xml
index 7be9c16f1..476ade966 100644
--- a/app/src/main/res/values-ja/strings.xml
+++ b/app/src/main/res/values-ja/strings.xml
@@ -384,10 +384,6 @@
     <string name="settings_advanced_read_cache_size">閲覧キャッシュのサイズ</string>
     <string name="settings_advanced_app_language_title">アプリ言語（Language）</string>
     <string name="settings_advanced_proxy">プロキシ</string>
-    <string name="settings_advanced_built_in_hosts_title">既定hosts.txt</string>
-    <string name="settings_advanced_built_in_hosts_summary">ホストをアプリ既定のIPにマッピング\nカスタムhosts.txtに上書きされます。</string>
-    <string name="settings_advanced_custom_hosts_title">カスタムhosts.txt</string>
-    <string name="settings_advanced_custom_hosts_summary">ホスト名をIPにマッピング\n既定のhosts.txtを上書きできます。</string>
     <string name="settings_advanced_export_data">データをエクスポート</string>
     <string name="settings_advanced_export_data_summary">ダウンロードリストやクイック検索などのデータを外部ストレージにエクスポートします</string>
     <string name="settings_advanced_export_data_to">データを%sにエクスポート</string>
@@ -431,15 +427,6 @@
     <string name="proxy_host_or_ip">ホスト名又はIP</string>
     <string name="proxy_port">ポート</string>
     <string name="proxy_invalid_port">入力したポートは無効です</string>
-    <!-- Hosts Activity -->
-    <string name="hosts">カスタムhosts.txt</string>
-    <string name="add_host">ホストを追加</string>
-    <string name="add_host_add">追加</string>
-    <string name="edit_host">ホストを編集</string>
-    <string name="edit_host_confirm">適用</string>
-    <string name="edit_host_delete">削除</string>
-    <string name="invalid_host">無効なホストです</string>
-    <string name="invalid_ip">無効なIPです</string>
 
     <!-- Errors -->
     <string name="error_bad_status_code">無効なステータスコード：%d</string>
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index 2bfbf14c2..db49034f1 100755
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -511,10 +511,6 @@
     <string name="settings_advanced_read_cache_size">阅读缓存大小</string>
     <string name="settings_advanced_app_language_title">App 界面语言</string>
     <string name="settings_advanced_proxy">代理</string>
-    <string name="settings_advanced_built_in_hosts_title">内置 hosts.txt</string>
-    <string name="settings_advanced_built_in_hosts_summary">应用提供的主机到 IP 的映射\n可被自定义 hosts.txt 覆盖</string>
-    <string name="settings_advanced_custom_hosts_title">自定义 hosts.txt</string>
-    <string name="settings_advanced_custom_hosts_summary">将主机名称映射到相应的 IP 地址\n可覆盖内置 hosts.txt</string>
     <string name="settings_advanced_backup_favorite">备份收藏列表</string>
     <string name="settings_advanced_backup_favorite_summary">备份云端收藏列表到本地</string>
     <string name="settings_advanced_backup_favorite_start">正在备份收藏列表 %s</string>
@@ -571,15 +567,6 @@
     <string name="proxy_host_or_ip">主机或 IP</string>
     <string name="proxy_port">端口</string>
     <string name="proxy_invalid_port">无效的端口</string>
-    <!-- Hosts Activity -->
-    <string name="hosts">自定义 hosts.txt</string>
-    <string name="add_host">添加 host</string>
-    <string name="add_host_add">添加</string>
-    <string name="edit_host">编辑 host</string>
-    <string name="edit_host_confirm">确认</string>
-    <string name="edit_host_delete">删除</string>
-    <string name="invalid_host">无效的 host</string>
-    <string name="invalid_ip">无效的 IP</string>
 
     <!-- Errors -->
     <string name="error_bad_status_code">错误状态码：%d</string>
diff --git a/app/src/main/res/values-zh-rHK/strings.xml b/app/src/main/res/values-zh-rHK/strings.xml
index 4a026177f..b20c4bcb9 100755
--- a/app/src/main/res/values-zh-rHK/strings.xml
+++ b/app/src/main/res/values-zh-rHK/strings.xml
@@ -511,10 +511,6 @@
     <string name="settings_advanced_read_cache_size">閲讀緩存大小</string>
     <string name="settings_advanced_app_language_title">App 界面語言</string>
     <string name="settings_advanced_proxy">代理</string>
-    <string name="settings_advanced_built_in_hosts_title">內置 hosts.txt</string>
-    <string name="settings_advanced_built_in_hosts_summary">應用提供的主機到 IP 的映射\n可被自定義 hosts.txt 覆蓋</string>
-    <string name="settings_advanced_custom_hosts_title">自定義 hosts.txt</string>
-    <string name="settings_advanced_custom_hosts_summary">將主機名稱映射到相應的 IP 地址\n可覆蓋內置 hosts.txt</string>
     <string name="settings_advanced_backup_favorite">備份收藏列表</string>
     <string name="settings_advanced_backup_favorite_summary">備份雲端收藏列表到本地</string>
     <string name="settings_advanced_backup_favorite_start">正在備份收藏列表 %s</string>
@@ -571,15 +567,6 @@
     <string name="proxy_host_or_ip">主機或 IP</string>
     <string name="proxy_port">端口</string>
     <string name="proxy_invalid_port">無效的端口</string>
-    <!-- Hosts Activity -->
-    <string name="hosts">自定義 hosts.txt</string>
-    <string name="add_host">添加 host</string>
-    <string name="add_host_add">添加</string>
-    <string name="edit_host">編輯 host</string>
-    <string name="edit_host_confirm">確認</string>
-    <string name="edit_host_delete">刪除</string>
-    <string name="invalid_host">無效的 host</string>
-    <string name="invalid_ip">無效的 IP</string>
 
     <!-- Errors -->
     <string name="error_bad_status_code">錯誤狀態碼：%d</string>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index 22395404d..e43a9a7c2 100755
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -511,10 +511,6 @@
     <string name="settings_advanced_read_cache_size">閱讀快取大小</string>
     <string name="settings_advanced_app_language_title">App 介面語言</string>
     <string name="settings_advanced_proxy">代理</string>
-    <string name="settings_advanced_built_in_hosts_title">內建 hosts.txt</string>
-    <string name="settings_advanced_built_in_hosts_summary">應用提供的主機到 IP 的對映\n可被自定義 hosts.txt 覆蓋</string>
-    <string name="settings_advanced_custom_hosts_title">自定義 hosts.txt</string>
-    <string name="settings_advanced_custom_hosts_summary">將主機名稱對映到相應的 IP 位址\n可覆蓋內建 hosts.txt</string>
     <string name="settings_advanced_backup_favorite">備份收藏列表</string>
     <string name="settings_advanced_backup_favorite_summary">備份雲端收藏列表到本機</string>
     <string name="settings_advanced_backup_favorite_start">正在備份收藏列表 %s</string>
@@ -571,15 +567,6 @@
     <string name="proxy_host_or_ip">主機或 IP</string>
     <string name="proxy_port">通訊埠</string>
     <string name="proxy_invalid_port">無效的通訊埠</string>
-    <!-- Hosts Activity -->
-    <string name="hosts">自訂 hosts.txt</string>
-    <string name="add_host">加入 host</string>
-    <string name="add_host_add">加入</string>
-    <string name="edit_host">編輯 host</string>
-    <string name="edit_host_confirm">確認</string>
-    <string name="edit_host_delete">刪除</string>
-    <string name="invalid_host">無效的 host</string>
-    <string name="invalid_ip">無效的 IP</string>
 
     <!-- Errors -->
     <string name="error_bad_status_code">錯誤狀態碼：%d</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 0eb95f6cc..db76e3ffd 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -539,10 +539,6 @@
     <string name="settings_advanced_proxy">Proxy</string>
     <string name="settings_advanced_proxy_summary_1" translatable="false">%1$s %2$s:%3$d</string>
     <string name="settings_advanced_proxy_summary_2" translatable="false">%1$s</string>
-    <string name="settings_advanced_built_in_hosts_title">Built-in hosts.txt</string>
-    <string name="settings_advanced_built_in_hosts_summary">Apply the built-in host-to-IP mapping provided by the app.\nIt can be overridden by custom hosts.txt</string>
-    <string name="settings_advanced_custom_hosts_title">Custom hosts.txt</string>
-    <string name="settings_advanced_custom_hosts_summary">Map hostnames to IP addresses.\nIt can override built-in hosts.txt</string>
     <string name="settings_advanced_user_agent_title" translatable="false">User Agent</string>
     <string name="settings_advanced_backup_favorite">Backup favorite list</string>
     <string name="settings_advanced_backup_favorite_summary">Backup remote favorite list to local</string>
@@ -608,18 +604,6 @@
     <string name="proxy_host_or_ip">Host or IP</string>
     <string name="proxy_port">Port</string>
     <string name="proxy_invalid_port">Invalid port</string>
-    <!-- Hosts Activity -->
-    <string name="hosts">Custom hosts.txt</string>
-    <string name="hosts_tip" translatable="false">hosts.txt</string>
-    <string name="add_host">Add a host</string>
-    <string name="hosts_host" translatable="false">Host</string>
-    <string name="hosts_ip" translatable="false">IP1(+IP2+IP3…)</string>
-    <string name="add_host_add">Add</string>
-    <string name="edit_host">Edit the host</string>
-    <string name="edit_host_confirm">Confirm</string>
-    <string name="edit_host_delete">Delete</string>
-    <string name="invalid_host">Invalid host</string>
-    <string name="invalid_ip">Invalid IP</string>
 
     <!-- Errors -->
     <string name="error_status_code_400" translatable="false">Bad Request</string>
diff --git a/app/src/main/res/xml/advanced_settings.xml b/app/src/main/res/xml/advanced_settings.xml
index b102f14d3..b8d3289f5 100644
--- a/app/src/main/res/xml/advanced_settings.xml
+++ b/app/src/main/res/xml/advanced_settings.xml
@@ -60,19 +60,6 @@
         android:title="@string/settings_advanced_proxy"
         app:iconSpaceReserved="false" />
 
-    <SwitchPreferenceCompat
-        android:defaultValue="false"
-        android:key="built_in_hosts_2"
-        android:summary="@string/settings_advanced_built_in_hosts_summary"
-        android:title="@string/settings_advanced_built_in_hosts_title"
-        app:iconSpaceReserved="false" />
-
-    <Preference
-        android:key="hosts"
-        android:summary="@string/settings_advanced_custom_hosts_summary"
-        android:title="@string/settings_advanced_custom_hosts_title"
-        app:iconSpaceReserved="false" />
-
     <com.hippo.ehviewer.preference.UserAgentPreference
         android:key="user_agent"
         android:title="@string/settings_advanced_user_agent_title"