diff --git a/app/src/main/java/com/hippo/ehviewer/Settings.java b/app/src/main/java/com/hippo/ehviewer/Settings.java
index 3581d6ef6..d407dc613 100644
--- a/app/src/main/java/com/hippo/ehviewer/Settings.java
+++ b/app/src/main/java/com/hippo/ehviewer/Settings.java
@@ -459,6 +459,28 @@ public class Settings {
         putBoolean(KEY_VOLUME_PAGE, value);
     }
 
+    private static final String KEY_CUSTOM_SCREEN_LIGHTNESS = "custom_screen_lightness";
+    private static final boolean DEFAULT_CUSTOM_SCREEN_LIGHTNESS = false;
+
+    public static boolean getCustomScreenLightness() {
+        return getBoolean(KEY_CUSTOM_SCREEN_LIGHTNESS, DEFAULT_CUSTOM_SCREEN_LIGHTNESS);
+    }
+
+    public static void putCustomScreenLightness(boolean value) {
+        putBoolean(KEY_CUSTOM_SCREEN_LIGHTNESS, value);
+    }
+
+    private static final String KEY_SCREEN_LIGHTNESS = "screen_lightness";
+    private static final int DEFAULT_SCREEN_LIGHTNESS = 50;
+
+    public static int getScreenLightness() {
+        return getInt(KEY_SCREEN_LIGHTNESS, DEFAULT_SCREEN_LIGHTNESS);
+    }
+
+    public static void putScreenLightness(int value) {
+        putInt(KEY_SCREEN_LIGHTNESS, value);
+    }
+
     /********************
      ****** Download
      ********************/
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/GalleryActivity.java b/app/src/main/java/com/hippo/ehviewer/ui/GalleryActivity.java
index 70b458b3e..5a01cda37 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/GalleryActivity.java
+++ b/app/src/main/java/com/hippo/ehviewer/ui/GalleryActivity.java
@@ -36,8 +36,10 @@ import android.text.TextUtils;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.View;
+import android.view.Window;
 import android.view.WindowManager;
 import android.webkit.MimeTypeMap;
+import android.widget.CompoundButton;
 import android.widget.FrameLayout;
 import android.widget.SeekBar;
 import android.widget.Spinner;
@@ -63,8 +65,10 @@ import com.hippo.gl.view.GLRootView;
 import com.hippo.image.Image;
 import com.hippo.unifile.UniFile;
 import com.hippo.util.SystemUiHelper;
+import com.hippo.widget.ColorView;
 import com.hippo.yorozuya.AnimationUtils;
 import com.hippo.yorozuya.ConcurrentPool;
+import com.hippo.yorozuya.MathUtils;
 import com.hippo.yorozuya.SimpleAnimatorListener;
 import com.hippo.yorozuya.SimpleHandler;
 import com.hippo.yorozuya.ViewUtils;
@@ -105,6 +109,8 @@ public class GalleryActivity extends EhActivity
     private SystemUiHelper mSystemUiHelper;
     private boolean mShowSystemUi;
 
+    @Nullable
+    private ColorView mMaskView;
     @Nullable
     private View mClock;
     @Nullable
@@ -261,6 +267,7 @@ public class GalleryActivity extends EhActivity
         mSystemUiHelper.hide();
         mShowSystemUi = false;
 
+        mMaskView = (ColorView) ViewUtils.$$(this, R.id.mask);
         mClock = ViewUtils.$$(this, R.id.clock);
         mBattery = ViewUtils.$$(this, R.id.battery);
         mClock.setVisibility(Settings.getShowClock() ? View.VISIBLE : View.GONE);
@@ -300,6 +307,9 @@ public class GalleryActivity extends EhActivity
         }
         setRequestedOrientation(orientation);
 
+        // Screen lightness
+        setScreenLightness(Settings.getCustomScreenLightness(), Settings.getScreenLightness());
+
         if (Settings.getGuideGallery()) {
             FrameLayout mainLayout = (FrameLayout) ViewUtils.$$(this, R.id.main);
             mainLayout.addView(new GalleryGuideView(this));
@@ -320,6 +330,9 @@ public class GalleryActivity extends EhActivity
             mGalleryProvider = null;
         }
 
+        mMaskView = null;
+        mClock = null;
+        mBattery = null;
         mSeekBarPanel = null;
         mLeftText = null;
         mRightText = null;
@@ -667,6 +680,34 @@ public class GalleryActivity extends EhActivity
         }
     }
 
+    /**
+     * @param lightness 0 - 200
+     */
+    private void setScreenLightness(boolean enable, int lightness) {
+        if (null == mMaskView) {
+            return;
+        }
+
+        Window w = getWindow();
+        WindowManager.LayoutParams lp = w.getAttributes();
+        if (enable) {
+            lightness = MathUtils.clamp(lightness, 0, 200);
+            if (lightness > 100) {
+                mMaskView.setColor(0);
+                // Avoid BRIGHTNESS_OVERRIDE_OFF,
+                // screen may be off when lp.screenBrightness is 0.0f
+                lp.screenBrightness = Math.max((lightness - 100) / 100.0f, 0.01f);
+            } else {
+                mMaskView.setColor(MathUtils.lerp(0xde, 0x00, lightness / 100.0f) << 24);
+                lp.screenBrightness = 0.01f;
+            }
+        } else {
+            mMaskView.setColor(0);
+            lp.screenBrightness = WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE;
+        }
+        w.setAttributes(lp);
+    }
+
     private class GalleryMenuHelper implements DialogInterface.OnClickListener {
 
         private final View mView;
@@ -678,6 +719,8 @@ public class GalleryActivity extends EhActivity
         private final SwitchCompat mShowClock;
         private final SwitchCompat mShowBattery;
         private final SwitchCompat mVolumePage;
+        private final SwitchCompat mCustomScreenLightness;
+        private final SeekBar mScreenLightness;
 
         @SuppressLint("InflateParams")
         public GalleryMenuHelper(Context context) {
@@ -690,6 +733,8 @@ public class GalleryActivity extends EhActivity
             mShowClock = (SwitchCompat) mView.findViewById(R.id.show_clock);
             mShowBattery = (SwitchCompat) mView.findViewById(R.id.show_battery);
             mVolumePage = (SwitchCompat) mView.findViewById(R.id.volume_page);
+            mCustomScreenLightness = (SwitchCompat) mView.findViewById(R.id.custom_screen_lightness);
+            mScreenLightness = (SeekBar) mView.findViewById(R.id.screen_lightness);
 
             mScreenRotation.setSelection(Settings.getScreenRotation());
             mReadingDirection.setSelection(Settings.getReadingDirection());
@@ -699,6 +744,16 @@ public class GalleryActivity extends EhActivity
             mShowClock.setChecked(Settings.getShowClock());
             mShowBattery.setChecked(Settings.getShowBattery());
             mVolumePage.setChecked(Settings.getVolumePage());
+            mCustomScreenLightness.setChecked(Settings.getCustomScreenLightness());
+            mScreenLightness.setProgress(Settings.getScreenLightness());
+            mScreenLightness.setEnabled(Settings.getCustomScreenLightness());
+
+            mCustomScreenLightness.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+                @Override
+                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                    mScreenLightness.setEnabled(isChecked);
+                }
+            });
         }
 
         public View getView() {
@@ -715,6 +770,8 @@ public class GalleryActivity extends EhActivity
             boolean showClock = mShowClock.isChecked();
             boolean showBattery = mShowBattery.isChecked();
             boolean volumePage = mVolumePage.isChecked();
+            boolean customScreenLightness = mCustomScreenLightness.isChecked();
+            int screenLightness = mScreenLightness.getProgress();
 
             Settings.putScreenRotation(screenRotation);
             Settings.putReadingDirection(layoutMode);
@@ -724,6 +781,8 @@ public class GalleryActivity extends EhActivity
             Settings.putShowClock(showClock);
             Settings.putShowBattery(showBattery);
             Settings.putVolumePage(volumePage);
+            Settings.putCustomScreenLightness(customScreenLightness);
+            Settings.putScreenLightness(screenLightness);
 
             int orientation;
             switch (screenRotation) {
@@ -755,6 +814,7 @@ public class GalleryActivity extends EhActivity
             if (mBattery != null) {
                 mBattery.setVisibility(showBattery ? View.VISIBLE : View.GONE);
             }
+            setScreenLightness(customScreenLightness, screenLightness);
 
             // Update slider
             mLayoutMode = layoutMode;
diff --git a/app/src/main/java/com/hippo/preference/SeekBarPreference.java b/app/src/main/java/com/hippo/preference/SeekBarPreference.java
new file mode 100644
index 000000000..4183518bf
--- /dev/null
+++ b/app/src/main/java/com/hippo/preference/SeekBarPreference.java
@@ -0,0 +1,229 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * 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.res.TypedArray;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.preference.Preference;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.SeekBar;
+
+import com.hippo.ehviewer.R;
+
+public class SeekBarPreference extends Preference implements SeekBar.OnSeekBarChangeListener {
+
+    private int mProgress;
+    private int mMax;
+    private boolean mTrackingTouch;
+
+    public SeekBarPreference(Context context) {
+        super(context);
+        init(context, null, 0, 0);
+    }
+
+    public SeekBarPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context, attrs, 0, 0);
+    }
+
+    public SeekBarPreference(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.SeekBarPreference, defStyleAttr, defStyleRes);
+        setMax(a.getInt(R.styleable.SeekBarPreference_max, mMax));
+        a.recycle();
+
+        setLayoutResource(R.layout.preference_widget_seekbar);
+    }
+
+    @Override
+    protected void onBindView(View view) {
+        super.onBindView(view);
+        SeekBar seekBar = (SeekBar) view.findViewById(R.id.seekbar);
+        seekBar.setOnSeekBarChangeListener(this);
+        seekBar.setMax(mMax);
+        seekBar.setProgress(mProgress);
+        seekBar.setEnabled(isEnabled());
+    }
+
+    @Override
+    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
+        setProgress(restoreValue ? getPersistedInt(mProgress)
+                : (Integer) defaultValue);
+    }
+
+    @Override
+    protected Object onGetDefaultValue(TypedArray a, int index) {
+        return a.getInt(index, 0);
+    }
+
+    public void setMax(int max) {
+        if (max != mMax) {
+            mMax = max;
+            notifyChanged();
+        }
+    }
+
+    public void setProgress(int progress) {
+        setProgress(progress, true);
+    }
+
+    private void setProgress(int progress, boolean notifyChanged) {
+        if (progress > mMax) {
+            progress = mMax;
+        }
+        if (progress < 0) {
+            progress = 0;
+        }
+        if (progress != mProgress) {
+            mProgress = progress;
+            persistInt(progress);
+            if (notifyChanged) {
+                notifyChanged();
+            }
+        }
+    }
+
+    public int getProgress() {
+        return mProgress;
+    }
+
+    /**
+     * Persist the seekBar's progress value if callChangeListener
+     * returns true, otherwise set the seekBar's progress to the stored value
+     */
+    void syncProgress(SeekBar seekBar) {
+        int progress = seekBar.getProgress();
+        if (progress != mProgress) {
+            if (callChangeListener(progress)) {
+                setProgress(progress, false);
+            } else {
+                seekBar.setProgress(mProgress);
+            }
+        }
+    }
+
+    @Override
+    public void onProgressChanged(
+            SeekBar seekBar, int progress, boolean fromUser) {
+        if (fromUser && !mTrackingTouch) {
+            syncProgress(seekBar);
+        }
+    }
+
+    @Override
+    public void onStartTrackingTouch(SeekBar seekBar) {
+        mTrackingTouch = true;
+    }
+
+    @Override
+    public void onStopTrackingTouch(SeekBar seekBar) {
+        mTrackingTouch = false;
+        if (seekBar.getProgress() != mProgress) {
+            syncProgress(seekBar);
+        }
+    }
+
+    @Override
+    protected Parcelable onSaveInstanceState() {
+        /*
+         * Suppose a client uses this preference type without persisting. We
+         * must save the instance state so it is able to, for example, survive
+         * orientation changes.
+         */
+
+        final Parcelable superState = super.onSaveInstanceState();
+        if (isPersistent()) {
+            // No need to save instance state since it's persistent
+            return superState;
+        }
+
+        // Save the instance state
+        final SavedState myState = new SavedState(superState);
+        myState.progress = mProgress;
+        myState.max = mMax;
+        return myState;
+    }
+
+    @Override
+    protected void onRestoreInstanceState(Parcelable state) {
+        if (!state.getClass().equals(SavedState.class)) {
+            // Didn't save state for us in onSaveInstanceState
+            super.onRestoreInstanceState(state);
+            return;
+        }
+
+        // Restore the instance state
+        SavedState myState = (SavedState) state;
+        super.onRestoreInstanceState(myState.getSuperState());
+        mProgress = myState.progress;
+        mMax = myState.max;
+        notifyChanged();
+    }
+
+    /**
+     * SavedState, a subclass of {@link BaseSavedState}, will store the state
+     * of MyPreference, a subclass of Preference.
+     * <p>
+     * It is important to always call through to super methods.
+     */
+    private static class SavedState extends BaseSavedState {
+        int progress;
+        int max;
+
+        public SavedState(Parcel source) {
+            super(source);
+
+            // Restore the click counter
+            progress = source.readInt();
+            max = source.readInt();
+        }
+
+        @Override
+        public void writeToParcel(Parcel dest, int flags) {
+            super.writeToParcel(dest, flags);
+
+            // Save the click counter
+            dest.writeInt(progress);
+            dest.writeInt(max);
+        }
+
+        public SavedState(Parcelable superState) {
+            super(superState);
+        }
+
+        @SuppressWarnings("unused")
+        public static final Parcelable.Creator<SavedState> CREATOR =
+                new Parcelable.Creator<SavedState>() {
+                    @Override
+                    public SavedState createFromParcel(Parcel in) {
+                        return new SavedState(in);
+                    }
+
+                    @Override
+                    public SavedState[] newArray(int size) {
+                        return new SavedState[size];
+                    }
+                };
+    }
+}
diff --git a/app/src/main/java/com/hippo/widget/ColorView.java b/app/src/main/java/com/hippo/widget/ColorView.java
new file mode 100644
index 000000000..077bdc239
--- /dev/null
+++ b/app/src/main/java/com/hippo/widget/ColorView.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2014 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.widget;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.util.AttributeSet;
+import android.view.View;
+
+public class ColorView extends View {
+
+    private int mColor;
+
+    public ColorView(Context context) {
+        super(context);
+    }
+
+    public ColorView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public ColorView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public void setColor(int color) {
+        if (mColor != color) {
+            mColor = color;
+            invalidate();
+        }
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        canvas.drawColor(mColor);
+    }
+}
diff --git a/app/src/main/res/layout-v21/preference_widget_seekbar.xml b/app/src/main/res/layout-v21/preference_widget_seekbar.xml
new file mode 100644
index 000000000..ed4184edb
--- /dev/null
+++ b/app/src/main/res/layout-v21/preference_widget_seekbar.xml
@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ 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.
+  -->
+
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:minHeight="?android:attr/listPreferredItemHeightSmall"
+    android:gravity="center_vertical"
+    android:paddingLeft="?android:attr/listPreferredItemPaddingLeft"
+    android:paddingRight="?android:attr/listPreferredItemPaddingRight"
+    android:background="?android:attr/activatedBackgroundIndicator"
+    android:clipToPadding="false">
+
+    <RelativeLayout
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:paddingTop="16dp"
+        android:paddingBottom="16dp">
+
+        <TextView
+            android:id="@android:id/title"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:singleLine="true"
+            android:textAppearance="?android:attr/textAppearanceListItem"
+            android:ellipsize="marquee" />
+
+        <TextView
+            android:id="@android:id/summary"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_below="@android:id/title"
+            android:layout_alignLeft="@android:id/title"
+            android:textAppearance="?android:attr/textAppearanceListItemSecondary"
+            android:textColor="?android:attr/textColorSecondary"
+            android:maxLines="10" />
+
+        <!-- Preference should place its actual preference widget here. -->
+        <LinearLayout
+            android:id="@android:id/widget_frame"
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:layout_below="@android:id/summary"
+            android:layout_alignLeft="@android:id/title"
+            android:minWidth="@dimen/preference_widget_width"
+            android:gravity="center"
+            android:orientation="vertical"/>
+
+        <SeekBar
+            android:id="@+id/seekbar"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_below="@android:id/summary"
+            android:layout_toRightOf="@android:id/widget_frame"
+            android:layout_alignParentRight="true"/>
+
+    </RelativeLayout>
+</LinearLayout>
diff --git a/app/src/main/res/layout/activity_gallery.xml b/app/src/main/res/layout/activity_gallery.xml
index 460b4fcb4..139e9b0f0 100644
--- a/app/src/main/res/layout/activity_gallery.xml
+++ b/app/src/main/res/layout/activity_gallery.xml
@@ -87,4 +87,10 @@
             android:gravity="center_horizontal"/>
 
     </com.hippo.ehviewer.widget.SeekBarPanel>
+
+    <com.hippo.widget.ColorView
+        android:id="@+id/mask"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
 </FrameLayout>
diff --git a/app/src/main/res/layout/dialog_gallery_menu.xml b/app/src/main/res/layout/dialog_gallery_menu.xml
index 38f6429cd..6ce79c57b 100644
--- a/app/src/main/res/layout/dialog_gallery_menu.xml
+++ b/app/src/main/res/layout/dialog_gallery_menu.xml
@@ -150,5 +150,18 @@
             android:text="@string/settings_read_volume_page"
             android:textColor="@color/primary_text_dark"/>
 
+        <android.support.v7.widget.SwitchCompat
+            android:id="@+id/custom_screen_lightness"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/settings_read_custom_screen_lightness"
+            android:textColor="@color/primary_text_dark"/>
+
+        <SeekBar
+            android:id="@+id/screen_lightness"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:max="200"/>
+
     </LinearLayout>
 </com.hippo.widget.IndicatingScrollView>
diff --git a/app/src/main/res/layout/preference_widget_seekbar.xml b/app/src/main/res/layout/preference_widget_seekbar.xml
new file mode 100644
index 000000000..080bd0c8c
--- /dev/null
+++ b/app/src/main/res/layout/preference_widget_seekbar.xml
@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ 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.
+  -->
+
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:minHeight="?android:attr/listPreferredItemHeight"
+    android:gravity="center_vertical"
+    android:paddingLeft="@dimen/preference_item_padding_side"
+    android:paddingRight="?android:attr/scrollbarSize"
+    android:background="?android:attr/activatedBackgroundIndicator">
+
+    <RelativeLayout
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:paddingRight="@dimen/preference_item_padding_inner"
+        android:paddingTop="6dip"
+        android:paddingBottom="6dip">
+
+        <TextView
+            android:id="@android:id/title"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:singleLine="true"
+            android:textAppearance="?android:attr/textAppearanceMedium"
+            android:ellipsize="marquee"
+            android:fadingEdge="horizontal"/>
+
+        <TextView
+            android:id="@android:id/summary"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_below="@android:id/title"
+            android:layout_alignLeft="@android:id/title"
+            android:textAppearance="?android:attr/textAppearanceSmall"
+            android:textColor="?android:attr/textColorSecondary"
+            android:maxLines="10"/>
+
+        <!-- Preference should place its actual preference widget here. -->
+        <LinearLayout
+            android:id="@android:id/widget_frame"
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:layout_below="@android:id/summary"
+            android:layout_alignLeft="@android:id/title"
+            android:minWidth="@dimen/preference_widget_width"
+            android:gravity="center"
+            android:orientation="vertical"/>
+
+        <SeekBar
+            android:id="@+id/seekbar"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_below="@android:id/summary"
+            android:layout_toRightOf="@android:id/widget_frame"
+            android:layout_alignParentRight="true"/>
+
+    </RelativeLayout>
+</LinearLayout>
diff --git a/app/src/main/res/values-land/dimens.xml b/app/src/main/res/values-land/dimens.xml
new file mode 100644
index 000000000..5bb7ce76b
--- /dev/null
+++ b/app/src/main/res/values-land/dimens.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ 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.
+  -->
+
+<resources>
+
+    <!-- Custom preference -->
+    <dimen name="preference_widget_width">72dp</dimen>
+
+</resources>
diff --git a/app/src/main/res/values-large/dimens.xml b/app/src/main/res/values-large/dimens.xml
new file mode 100644
index 000000000..7805c7ddb
--- /dev/null
+++ b/app/src/main/res/values-large/dimens.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ 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.
+  -->
+
+<resources>
+
+    <!-- Custom preference -->
+    <dimen name="preference_widget_width">56dp</dimen>
+
+</resources>
diff --git a/app/src/main/res/values-sw720dp-w1280dp/dimens.xml b/app/src/main/res/values-sw720dp-w1280dp/dimens.xml
new file mode 100644
index 000000000..489cf90b1
--- /dev/null
+++ b/app/src/main/res/values-sw720dp-w1280dp/dimens.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ 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.
+  -->
+
+<resources>
+
+    <!-- Custom preference -->
+    <dimen name="preference_widget_width">64dp</dimen>
+
+</resources>
diff --git a/app/src/main/res/values-sw720dp/dimens.xml b/app/src/main/res/values-sw720dp/dimens.xml
new file mode 100644
index 000000000..784a15e01
--- /dev/null
+++ b/app/src/main/res/values-sw720dp/dimens.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ 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.
+  -->
+
+<resources>
+
+</resources>
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index f61c7d902..6da245d27 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -401,6 +401,8 @@
     <string name="settings_read_show_clock">显示时钟</string>
     <string name="settings_read_show_battery">显示电量</string>
     <string name="settings_read_volume_page">使用音量键翻页</string>
+    <string name="settings_read_custom_screen_lightness">自定义屏幕亮度</string>
+    <string name="settings_read_screen_lightness">屏幕亮度</string>
 
     <string name="settings_download">下载</string>
     <string name="settings_download_download_location">下载路径</string>
diff --git a/app/src/main/res/values-zh-rHK/strings.xml b/app/src/main/res/values-zh-rHK/strings.xml
index d79bae753..8214eb447 100644
--- a/app/src/main/res/values-zh-rHK/strings.xml
+++ b/app/src/main/res/values-zh-rHK/strings.xml
@@ -401,6 +401,8 @@
     <string name="settings_read_show_clock">顯示時鐘</string>
     <string name="settings_read_show_battery">顯示電量</string>
     <string name="settings_read_volume_page">使用音量鍵翻頁</string>
+    <string name="settings_read_custom_screen_lightness">自定義屏幕亮度</string>
+    <string name="settings_read_screen_lightness">屏幕亮度</string>
 
     <string name="settings_download">下載</string>
     <string name="settings_download_download_location">下載路徑</string>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index a33e7ded5..fcb22e91d 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -401,6 +401,8 @@
     <string name="settings_read_show_clock">顯示時鐘</string>
     <string name="settings_read_show_battery">顯示電量</string>
     <string name="settings_read_volume_page">使用音量鍵翻頁</string>
+    <string name="settings_read_custom_screen_lightness">自定義螢幕亮度</string>
+    <string name="settings_read_screen_lightness">螢幕亮度</string>
 
     <string name="settings_download">下載</string>
     <string name="settings_download_download_location">下載路徑</string>
diff --git a/app/src/main/res/values/attrs.xml b/app/src/main/res/values/attrs.xml
index ee6d9df20..2636a0e67 100644
--- a/app/src/main/res/values/attrs.xml
+++ b/app/src/main/res/values/attrs.xml
@@ -137,4 +137,8 @@
         <attr name="url" format="string"/>
     </declare-styleable>
 
+    <declare-styleable name="SeekBarPreference">
+        <attr name="max" format="integer"/>
+    </declare-styleable>
+
 </resources>
diff --git a/app/src/main/res/values/dimens.xml b/app/src/main/res/values/dimens.xml
index 66bf46a4e..aaca3f65b 100644
--- a/app/src/main/res/values/dimens.xml
+++ b/app/src/main/res/values/dimens.xml
@@ -109,4 +109,9 @@
     <dimen name="lock_pattern_dot_size">12dp</dimen>
     <dimen name="lock_pattern_dot_size_activated">28dp</dimen>
 
+    <!-- Custom preference -->
+    <dimen name="preference_widget_width">48dp</dimen>
+    <dimen name="preference_item_padding_side">8dip</dimen>
+    <dimen name="preference_item_padding_inner">8dip</dimen>
+
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d66ad7646..f5efb878c 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -443,6 +443,8 @@
     <string name="settings_read_show_clock">Show clock</string>
     <string name="settings_read_show_battery">Show battery</string>
     <string name="settings_read_volume_page">Use volume key to turn pages</string>
+    <string name="settings_read_custom_screen_lightness">Custom screen lightness</string>
+    <string name="settings_read_screen_lightness">Screen lightness</string>
 
     <string name="settings_download">Download</string>
     <string name="settings_download_download_location">Download location</string>
diff --git a/app/src/main/res/xml/read_settings.xml b/app/src/main/res/xml/read_settings.xml
index 0d73bff3d..fdadecaa4 100644
--- a/app/src/main/res/xml/read_settings.xml
+++ b/app/src/main/res/xml/read_settings.xml
@@ -71,4 +71,16 @@
         android:title="@string/settings_read_volume_page"
         android:defaultValue="false"/>
 
+    <com.hippo.preference.SwitchPreference
+        android:key="custom_screen_lightness"
+        android:title="@string/settings_read_custom_screen_lightness"
+        android:defaultValue="false"/>
+
+    <com.hippo.preference.SeekBarPreference
+        android:key="screen_lightness"
+        android:title="@string/settings_read_screen_lightness"
+        android:dependency="custom_screen_lightness"
+        app:max="200"
+        android:defaultValue="50"/>
+
 </PreferenceScreen>