diff --git a/app/src/main/java/com/hippo/ehviewer/preference/SignInRequiredActivityPreference.java b/app/src/main/java/com/hippo/ehviewer/preference/SignInRequiredActivityPreference.java
deleted file mode 100644
index 60c76a33f..000000000
--- a/app/src/main/java/com/hippo/ehviewer/preference/SignInRequiredActivityPreference.java
+++ /dev/null
@@ -1,68 +0,0 @@
-/*
- * Copyright 2019 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.preference;
-
-import android.annotation.SuppressLint;
-import android.content.Context;
-import android.util.AttributeSet;
-
-import com.hippo.ehviewer.EhApplication;
-import com.hippo.ehviewer.R;
-import com.hippo.ehviewer.client.EhCookieStore;
-import com.hippo.ehviewer.client.EhUrl;
-import com.hippo.ehviewer.ui.SettingsActivity;
-import com.hippo.ehviewer.ui.scene.BaseScene;
-import com.hippo.preference.ActivityPreference;
-
-import okhttp3.HttpUrl;
-
-public class SignInRequiredActivityPreference extends ActivityPreference {
-
-    @SuppressLint("StaticFieldLeak")
-    private final SettingsActivity mActivity;
-
-    public SignInRequiredActivityPreference(Context context) {
-        super(context);
-        mActivity = (SettingsActivity) context;
-    }
-
-    public SignInRequiredActivityPreference(Context context, AttributeSet attrs) {
-        super(context, attrs);
-        mActivity = (SettingsActivity) context;
-    }
-
-    public SignInRequiredActivityPreference(Context context, AttributeSet attrs, int defStyleAttr) {
-        super(context, attrs, defStyleAttr);
-        mActivity = (SettingsActivity) context;
-    }
-
-    @Override
-    protected void onClick() {
-        EhCookieStore store = EhApplication.getEhCookieStore(getContext());
-        HttpUrl e = HttpUrl.get(EhUrl.HOST_E);
-        HttpUrl ex = HttpUrl.get(EhUrl.HOST_EX);
-
-        if (store.contains(e, EhCookieStore.KEY_IPD_MEMBER_ID) ||
-                store.contains(e, EhCookieStore.KEY_IPD_PASS_HASH) ||
-                store.contains(ex, EhCookieStore.KEY_IPD_MEMBER_ID) ||
-                store.contains(ex, EhCookieStore.KEY_IPD_PASS_HASH)) {
-            super.onClick();
-        } else {
-            mActivity.showTip(R.string.error_please_login_first, BaseScene.LENGTH_SHORT);
-        }
-    }
-}
diff --git a/app/src/main/java/com/hippo/preference/ActivityPreference.java b/app/src/main/java/com/hippo/preference/ActivityPreference.java
deleted file mode 100644
index 81e4ab2e1..000000000
--- a/app/src/main/java/com/hippo/preference/ActivityPreference.java
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
- * Copyright 2016 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.preference;
-
-import android.content.Context;
-import android.content.Intent;
-import android.content.res.TypedArray;
-import android.util.AttributeSet;
-import android.util.Log;
-import android.widget.Toast;
-
-import androidx.preference.Preference;
-
-import com.hippo.ehviewer.R;
-import com.hippo.util.ExceptionUtils;
-
-public class ActivityPreference extends Preference {
-
-    private static final String TAG = ActivityPreference.class.getSimpleName();
-
-    private Class<?> mActivityClazz;
-
-    public ActivityPreference(Context context) {
-        super(context);
-        init(context, null, 0, 0);
-    }
-
-    public ActivityPreference(Context context, AttributeSet attrs) {
-        super(context, attrs);
-        init(context, attrs, 0, 0);
-    }
-
-    public ActivityPreference(Context context, AttributeSet attrs, int defStyleAttr) {
-        super(context, attrs, defStyleAttr);
-        init(context, attrs, defStyleAttr, 0);
-    }
-
-    private void init(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
-        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ActivityPreference, defStyleAttr, defStyleRes);
-        String clazzName = a.getString(R.styleable.ActivityPreference_activity);
-        if (null != clazzName) {
-            try {
-                mActivityClazz = Class.forName(clazzName);
-            } catch (ClassNotFoundException e) {
-                Log.e(TAG, "Can't find class " + clazzName, e);
-            }
-        }
-        a.recycle();
-    }
-
-    @Override
-    protected void onClick() {
-        if (null == mActivityClazz) {
-            return;
-        }
-
-        Context context = getContext();
-        Intent intent = new Intent(context, mActivityClazz);
-        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-        try {
-            context.startActivity(intent);
-        } catch (Throwable e) {
-            ExceptionUtils.throwIfFatal(e);
-            Toast.makeText(context, R.string.error_cant_find_activity, Toast.LENGTH_SHORT).show();
-        }
-    }
-}