diff --git a/app/src/main/java/acr/browser/lightning/activity/BrowserActivity.java b/app/src/main/java/acr/browser/lightning/activity/BrowserActivity.java
index 2f5283b..3813360 100644
--- a/app/src/main/java/acr/browser/lightning/activity/BrowserActivity.java
+++ b/app/src/main/java/acr/browser/lightning/activity/BrowserActivity.java
@@ -49,7 +49,6 @@ import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.View.OnFocusChangeListener;
 import android.view.View.OnKeyListener;
-import android.view.View.OnLongClickListener;
 import android.view.View.OnTouchListener;
 import android.view.ViewConfiguration;
 import android.view.ViewGroup;
diff --git a/app/src/main/java/acr/browser/lightning/app/BrowserApp.java b/app/src/main/java/acr/browser/lightning/app/BrowserApp.java
index ebbae02..d7679c5 100644
--- a/app/src/main/java/acr/browser/lightning/app/BrowserApp.java
+++ b/app/src/main/java/acr/browser/lightning/app/BrowserApp.java
@@ -31,7 +31,6 @@ public class BrowserApp extends Application {
 
     @Nullable private static AppComponent sAppComponent;
     private static final Executor mIOThread = Executors.newSingleThreadExecutor();
-    private static final Executor mTaskThread = Executors.newCachedThreadPool();
 
     @Inject PreferenceManager mPreferenceManager;
 
diff --git a/app/src/main/java/acr/browser/lightning/database/HistoryItem.java b/app/src/main/java/acr/browser/lightning/database/HistoryItem.java
index 137f295..b439b1b 100644
--- a/app/src/main/java/acr/browser/lightning/database/HistoryItem.java
+++ b/app/src/main/java/acr/browser/lightning/database/HistoryItem.java
@@ -30,14 +30,6 @@ public class HistoryItem implements Comparable<HistoryItem> {
 
     public HistoryItem() {}
 
-    public HistoryItem(@NonNull HistoryItem item) {
-        this.mUrl = item.mUrl;
-        this.mTitle = item.mTitle;
-        this.mFolder = item.mFolder;
-        this.mOrder = item.mOrder;
-        this.mIsFolder = item.mIsFolder;
-    }
-
     public HistoryItem(@NonNull String url, @NonNull String title) {
         Preconditions.checkNonNull(url);
         Preconditions.checkNonNull(title);
diff --git a/app/src/main/java/acr/browser/lightning/fragment/PrivacySettingsFragment.java b/app/src/main/java/acr/browser/lightning/fragment/PrivacySettingsFragment.java
index fac64af..f3d6ecc 100644
--- a/app/src/main/java/acr/browser/lightning/fragment/PrivacySettingsFragment.java
+++ b/app/src/main/java/acr/browser/lightning/fragment/PrivacySettingsFragment.java
@@ -8,8 +8,6 @@ import android.app.Dialog;
 import android.content.DialogInterface;
 import android.os.Build;
 import android.os.Bundle;
-import android.os.Handler;
-import android.os.Message;
 import android.preference.CheckBoxPreference;
 import android.preference.Preference;
 import android.support.annotation.NonNull;
diff --git a/app/src/main/java/acr/browser/lightning/utils/ThemeUtils.java b/app/src/main/java/acr/browser/lightning/utils/ThemeUtils.java
index 77bb8ca..165f8d8 100644
--- a/app/src/main/java/acr/browser/lightning/utils/ThemeUtils.java
+++ b/app/src/main/java/acr/browser/lightning/utils/ThemeUtils.java
@@ -61,11 +61,6 @@ public class ThemeUtils {
         return (dark) ? getIconDarkThemeColor(context) : getIconLightThemeColor(context);
     }
 
-    public static void themeImageView(@NonNull ImageView icon, @NonNull Context context, boolean dark) {
-        int color = dark ? getIconDarkThemeColor(context) : getIconLightThemeColor(context);
-        icon.setColorFilter(color, PorterDuff.Mode.SRC_IN);
-    }
-
     @NonNull
     private static Drawable getVectorDrawable(@NonNull Context context, int drawableId) {
         Drawable drawable = ContextCompat.getDrawable(context, drawableId);
@@ -116,14 +111,6 @@ public class ThemeUtils {
         return drawable;
     }
 
-    @NonNull
-    public static ColorDrawable getSelectedBackground(@NonNull Context context, boolean dark) {
-        @ColorInt final int color =
-            (dark) ? ContextCompat.getColor(context, R.color.selected_dark) : ContextCompat.getColor(
-                context, R.color.selected_light);
-        return new ColorDrawable(color);
-    }
-
     public static int getThemedTextHintColor(boolean dark) {
         return 0x80ffffff & (dark ? Color.WHITE : Color.BLACK);
     }
diff --git a/app/src/main/java/acr/browser/lightning/view/LightningChromeClient.java b/app/src/main/java/acr/browser/lightning/view/LightningChromeClient.java
index 2aab716..80f40bc 100644
--- a/app/src/main/java/acr/browser/lightning/view/LightningChromeClient.java
+++ b/app/src/main/java/acr/browser/lightning/view/LightningChromeClient.java
@@ -33,8 +33,6 @@ import acr.browser.lightning.utils.Preconditions;
 
 public class LightningChromeClient extends WebChromeClient {
 
-    private static final String TAG = LightningChromeClient.class.getSimpleName();
-
     private static final String[] PERMISSIONS = new String[]{Manifest.permission.ACCESS_FINE_LOCATION};
 
     @NonNull private final Activity mActivity;