diff --git a/java/res/xml/prefs.xml b/java/res/xml/prefs.xml
index 09c6f74..fc79bd0 100644
--- a/java/res/xml/prefs.xml
+++ b/java/res/xml/prefs.xml
@@ -68,7 +68,7 @@
             android:defaultValue="true"
             android:persistent="true" />
         <PreferenceScreen
-            android:fragment="com.android.inputmethod.latin.settings.DebugSettings"
+            android:fragment="com.android.inputmethod.latin.settings.DebugSettingsFragment"
             android:key="screen_debug"
             android:title="Debug settings"
             android:defaultValue="false"
diff --git a/java/src/com/android/inputmethod/latin/settings/DebugSettings.java b/java/src/com/android/inputmethod/latin/settings/DebugSettings.java
index e4271ad..dce11b4 100644
--- a/java/src/com/android/inputmethod/latin/settings/DebugSettings.java
+++ b/java/src/com/android/inputmethod/latin/settings/DebugSettings.java
@@ -16,28 +16,7 @@
 
 package com.android.inputmethod.latin.settings;
 
-import android.content.Intent;
-import android.content.SharedPreferences;
-import android.content.res.Resources;
-import android.os.Bundle;
-import android.os.Process;
-import android.preference.Preference;
-import android.preference.Preference.OnPreferenceClickListener;
-import android.preference.PreferenceFragment;
-import android.preference.PreferenceGroup;
-import android.preference.PreferenceScreen;
-import android.preference.TwoStatePreference;
-
-import com.android.inputmethod.latin.DictionaryDumpBroadcastReceiver;
-import com.android.inputmethod.latin.DictionaryFacilitator;
-import com.android.inputmethod.latin.R;
-import com.android.inputmethod.latin.debug.ExternalDictionaryGetterForDebug;
-import com.android.inputmethod.latin.utils.ApplicationUtils;
-import com.android.inputmethod.latin.utils.ResourceUtils;
-
-public final class DebugSettings extends PreferenceFragment
-        implements SharedPreferences.OnSharedPreferenceChangeListener {
-
+public final class DebugSettings {
     public static final String PREF_DEBUG_MODE = "debug_mode";
     public static final String PREF_FORCE_NON_DISTINCT_MULTITOUCH = "force_non_distinct_multitouch";
     public static final String PREF_KEY_PREVIEW_SHOW_UP_START_SCALE =
@@ -48,251 +27,10 @@
             "pref_key_preview_show_up_duration";
     public static final String PREF_KEY_PREVIEW_DISMISS_DURATION =
             "pref_key_preview_dismiss_duration";
-    private static final String PREF_READ_EXTERNAL_DICTIONARY = "read_external_dictionary";
-    private static final String PREF_KEY_DUMP_DICTS = "pref_key_dump_dictionaries";
-    private static final String PREF_KEY_DUMP_DICT_PREFIX = "pref_key_dump_dictionaries";
-    private static final String DICT_NAME_KEY_FOR_EXTRAS = "dict_name";
     public static final String PREF_SLIDING_KEY_INPUT_PREVIEW = "pref_sliding_key_input_preview";
     public static final String PREF_KEY_LONGPRESS_TIMEOUT = "pref_key_longpress_timeout";
 
-    private boolean mServiceNeedsRestart = false;
-    private TwoStatePreference mDebugMode;
-
-    @Override
-    public void onCreate(Bundle icicle) {
-        super.onCreate(icicle);
-        addPreferencesFromResource(R.xml.prefs_screen_debug);
-        TwoStatePreferenceHelper.replaceCheckBoxPreferencesBySwitchPreferences(
-                getPreferenceScreen());
-        SharedPreferences prefs = getPreferenceManager().getSharedPreferences();
-        prefs.registerOnSharedPreferenceChangeListener(this);
-
-        final PreferenceScreen readExternalDictionary =
-                (PreferenceScreen) findPreference(PREF_READ_EXTERNAL_DICTIONARY);
-        if (null != readExternalDictionary) {
-            readExternalDictionary.setOnPreferenceClickListener(
-                    new Preference.OnPreferenceClickListener() {
-                        @Override
-                        public boolean onPreferenceClick(final Preference arg0) {
-                            ExternalDictionaryGetterForDebug.chooseAndInstallDictionary(
-                                    getActivity());
-                            mServiceNeedsRestart = true;
-                            return true;
-                        }
-                    });
-        }
-
-        final PreferenceGroup dictDumpPreferenceGroup =
-                (PreferenceGroup)findPreference(PREF_KEY_DUMP_DICTS);
-        final OnPreferenceClickListener dictDumpPrefClickListener =
-                new DictDumpPrefClickListener(this);
-        for (final String dictName : DictionaryFacilitator.DICT_TYPE_TO_CLASS.keySet()) {
-            final Preference preference = new Preference(getActivity());
-            preference.setKey(PREF_KEY_DUMP_DICT_PREFIX + dictName);
-            preference.setTitle("Dump " + dictName + " dictionary");
-            preference.setOnPreferenceClickListener(dictDumpPrefClickListener);
-            preference.getExtras().putString(DICT_NAME_KEY_FOR_EXTRAS, dictName);
-            dictDumpPreferenceGroup.addPreference(preference);
-        }
-        final Resources res = getResources();
-        setupKeyLongpressTimeoutSettings(prefs, res);
-        setupKeyPreviewAnimationDuration(prefs, res, PREF_KEY_PREVIEW_SHOW_UP_DURATION,
-                res.getInteger(R.integer.config_key_preview_show_up_duration));
-        setupKeyPreviewAnimationDuration(prefs, res, PREF_KEY_PREVIEW_DISMISS_DURATION,
-                res.getInteger(R.integer.config_key_preview_dismiss_duration));
-        setupKeyPreviewAnimationScale(prefs, res, PREF_KEY_PREVIEW_SHOW_UP_START_SCALE,
-                ResourceUtils.getFloatFromFraction(
-                        res, R.fraction.config_key_preview_show_up_start_scale));
-        setupKeyPreviewAnimationScale(prefs, res, PREF_KEY_PREVIEW_DISMISS_END_SCALE,
-                ResourceUtils.getFloatFromFraction(
-                        res, R.fraction.config_key_preview_dismiss_end_scale));
-
-        mServiceNeedsRestart = false;
-        mDebugMode = (TwoStatePreference) findPreference(PREF_DEBUG_MODE);
-        updateDebugMode();
-    }
-
-    private static class DictDumpPrefClickListener implements OnPreferenceClickListener {
-        final PreferenceFragment mPreferenceFragment;
-
-        public DictDumpPrefClickListener(final PreferenceFragment preferenceFragment) {
-            mPreferenceFragment = preferenceFragment;
-        }
-
-        @Override
-        public boolean onPreferenceClick(final Preference arg0) {
-            final String dictName = arg0.getExtras().getString(DICT_NAME_KEY_FOR_EXTRAS);
-            if (dictName != null) {
-                final Intent intent =
-                        new Intent(DictionaryDumpBroadcastReceiver.DICTIONARY_DUMP_INTENT_ACTION);
-                intent.putExtra(DictionaryDumpBroadcastReceiver.DICTIONARY_NAME_KEY, dictName);
-                mPreferenceFragment.getActivity().sendBroadcast(intent);
-            }
-            return true;
-        }
-    }
-
-    @Override
-    public void onStop() {
-        super.onStop();
-        if (mServiceNeedsRestart) {
-            Process.killProcess(Process.myPid());
-        }
-    }
-
-    @Override
-    public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
-        if (key.equals(PREF_DEBUG_MODE) && mDebugMode != null) {
-            mDebugMode.setChecked(prefs.getBoolean(PREF_DEBUG_MODE, false));
-            updateDebugMode();
-            mServiceNeedsRestart = true;
-            return;
-        }
-        if (key.equals(PREF_FORCE_NON_DISTINCT_MULTITOUCH)) {
-            mServiceNeedsRestart = true;
-            return;
-        }
-    }
-
-    private void updateDebugMode() {
-        if (mDebugMode == null) {
-            return;
-        }
-        boolean isDebugMode = mDebugMode.isChecked();
-        final String version = getResources().getString(
-                R.string.version_text, ApplicationUtils.getVersionName(getActivity()));
-        if (!isDebugMode) {
-            mDebugMode.setTitle(version);
-            mDebugMode.setSummary("");
-        } else {
-            mDebugMode.setTitle(getResources().getString(R.string.prefs_debug_mode));
-            mDebugMode.setSummary(version);
-        }
-    }
-
-    private void setupKeyLongpressTimeoutSettings(final SharedPreferences sp,
-            final Resources res) {
-        final SeekBarDialogPreference pref = (SeekBarDialogPreference)findPreference(
-                PREF_KEY_LONGPRESS_TIMEOUT);
-        if (pref == null) {
-            return;
-        }
-        pref.setInterface(new SeekBarDialogPreference.ValueProxy() {
-            @Override
-            public void writeValue(final int value, final String key) {
-                sp.edit().putInt(key, value).apply();
-            }
-
-            @Override
-            public void writeDefaultValue(final String key) {
-                sp.edit().remove(key).apply();
-            }
-
-            @Override
-            public int readValue(final String key) {
-                return Settings.readKeyLongpressTimeout(sp, res);
-            }
-
-            @Override
-            public int readDefaultValue(final String key) {
-                return Settings.readDefaultKeyLongpressTimeout(res);
-            }
-
-            @Override
-            public String getValueText(final int value) {
-                return res.getString(R.string.abbreviation_unit_milliseconds, value);
-            }
-
-            @Override
-            public void feedbackValue(final int value) {}
-        });
-    }
-
-    private void setupKeyPreviewAnimationScale(final SharedPreferences sp, final Resources res,
-            final String prefKey, final float defaultValue) {
-        final SeekBarDialogPreference pref = (SeekBarDialogPreference)findPreference(prefKey);
-        if (pref == null) {
-            return;
-        }
-        pref.setInterface(new SeekBarDialogPreference.ValueProxy() {
-            private static final float PERCENTAGE_FLOAT = 100.0f;
-
-            private float getValueFromPercentage(final int percentage) {
-                return percentage / PERCENTAGE_FLOAT;
-            }
-
-            private int getPercentageFromValue(final float floatValue) {
-                return (int)(floatValue * PERCENTAGE_FLOAT);
-            }
-
-            @Override
-            public void writeValue(final int value, final String key) {
-                sp.edit().putFloat(key, getValueFromPercentage(value)).apply();
-            }
-
-            @Override
-            public void writeDefaultValue(final String key) {
-                sp.edit().remove(key).apply();
-            }
-
-            @Override
-            public int readValue(final String key) {
-                return getPercentageFromValue(
-                        Settings.readKeyPreviewAnimationScale(sp, key, defaultValue));
-            }
-
-            @Override
-            public int readDefaultValue(final String key) {
-                return getPercentageFromValue(defaultValue);
-            }
-
-            @Override
-            public String getValueText(final int value) {
-                if (value < 0) {
-                    return res.getString(R.string.settings_system_default);
-                }
-                return String.format("%d%%", value);
-            }
-
-            @Override
-            public void feedbackValue(final int value) {}
-        });
-    }
-
-    private void setupKeyPreviewAnimationDuration(final SharedPreferences sp, final Resources res,
-            final String prefKey, final int defaultValue) {
-        final SeekBarDialogPreference pref = (SeekBarDialogPreference)findPreference(prefKey);
-        if (pref == null) {
-            return;
-        }
-        pref.setInterface(new SeekBarDialogPreference.ValueProxy() {
-            @Override
-            public void writeValue(final int value, final String key) {
-                sp.edit().putInt(key, value).apply();
-            }
-
-            @Override
-            public void writeDefaultValue(final String key) {
-                sp.edit().remove(key).apply();
-            }
-
-            @Override
-            public int readValue(final String key) {
-                return Settings.readKeyPreviewAnimationDuration(sp, key, defaultValue);
-            }
-
-            @Override
-            public int readDefaultValue(final String key) {
-                return defaultValue;
-            }
-
-            @Override
-            public String getValueText(final int value) {
-                return res.getString(R.string.abbreviation_unit_milliseconds, value);
-            }
-
-            @Override
-            public void feedbackValue(final int value) {}
-        });
+    private DebugSettings() {
+        // This class is not publicly instantiable.
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/settings/DebugSettingsFragment.java b/java/src/com/android/inputmethod/latin/settings/DebugSettingsFragment.java
new file mode 100644
index 0000000..4e41d52
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/settings/DebugSettingsFragment.java
@@ -0,0 +1,283 @@
+/*
+ * Copyright (C) 2014 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.android.inputmethod.latin.settings;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.content.res.Resources;
+import android.os.Bundle;
+import android.os.Process;
+import android.preference.Preference;
+import android.preference.Preference.OnPreferenceClickListener;
+import android.preference.PreferenceGroup;
+import android.preference.TwoStatePreference;
+
+import com.android.inputmethod.latin.DictionaryDumpBroadcastReceiver;
+import com.android.inputmethod.latin.DictionaryFacilitator;
+import com.android.inputmethod.latin.R;
+import com.android.inputmethod.latin.debug.ExternalDictionaryGetterForDebug;
+import com.android.inputmethod.latin.utils.ApplicationUtils;
+import com.android.inputmethod.latin.utils.ResourceUtils;
+
+import java.util.Locale;
+
+/**
+ * "Debug mode" settings sub screen.
+ *
+ * This settings sub screen handles a several preference options for debugging.
+ */
+public final class DebugSettingsFragment extends SubScreenFragment
+        implements OnPreferenceClickListener {
+    private static final String PREF_READ_EXTERNAL_DICTIONARY = "read_external_dictionary";
+    private static final String PREF_KEY_DUMP_DICTS = "pref_key_dump_dictionaries";
+    private static final String PREF_KEY_DUMP_DICT_PREFIX = "pref_key_dump_dictionaries";
+
+    private boolean mServiceNeedsRestart = false;
+    private Preference mReadExternalDictionaryPref;
+    private TwoStatePreference mDebugMode;
+
+    @Override
+    public void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+        addPreferencesFromResource(R.xml.prefs_screen_debug);
+
+        mReadExternalDictionaryPref = findPreference(PREF_READ_EXTERNAL_DICTIONARY);
+        if (mReadExternalDictionaryPref != null) {
+            mReadExternalDictionaryPref.setOnPreferenceClickListener(this);
+        }
+
+        final PreferenceGroup dictDumpPreferenceGroup =
+                (PreferenceGroup)findPreference(PREF_KEY_DUMP_DICTS);
+        for (final String dictName : DictionaryFacilitator.DICT_TYPE_TO_CLASS.keySet()) {
+            final Preference pref = new DictDumpPreference(getActivity(), dictName);
+            pref.setOnPreferenceClickListener(this);
+            dictDumpPreferenceGroup.addPreference(pref);
+        }
+        final Resources res = getResources();
+        setupKeyLongpressTimeoutSettings();
+        setupKeyPreviewAnimationDuration(DebugSettings.PREF_KEY_PREVIEW_SHOW_UP_DURATION,
+                res.getInteger(R.integer.config_key_preview_show_up_duration));
+        setupKeyPreviewAnimationDuration(DebugSettings.PREF_KEY_PREVIEW_DISMISS_DURATION,
+                res.getInteger(R.integer.config_key_preview_dismiss_duration));
+        setupKeyPreviewAnimationScale(DebugSettings.PREF_KEY_PREVIEW_SHOW_UP_START_SCALE,
+                ResourceUtils.getFloatFromFraction(
+                        res, R.fraction.config_key_preview_show_up_start_scale));
+        setupKeyPreviewAnimationScale(DebugSettings.PREF_KEY_PREVIEW_DISMISS_END_SCALE,
+                ResourceUtils.getFloatFromFraction(
+                        res, R.fraction.config_key_preview_dismiss_end_scale));
+
+        mServiceNeedsRestart = false;
+        mDebugMode = (TwoStatePreference) findPreference(DebugSettings.PREF_DEBUG_MODE);
+        updateDebugMode();
+    }
+
+    private static class DictDumpPreference extends Preference {
+        public final String mDictName;
+
+        public DictDumpPreference(final Context context, final String dictName) {
+            super(context);
+            setKey(PREF_KEY_DUMP_DICT_PREFIX + dictName);
+            setTitle("Dump " + dictName + " dictionary");
+            mDictName = dictName;
+        }
+    }
+
+    @Override
+    public boolean onPreferenceClick(final Preference pref) {
+        final Context context = getActivity();
+        if (pref == mReadExternalDictionaryPref) {
+            ExternalDictionaryGetterForDebug.chooseAndInstallDictionary(context);
+            mServiceNeedsRestart = true;
+            return true;
+        }
+        if (pref instanceof DictDumpPreference) {
+            final DictDumpPreference dictDumpPref = (DictDumpPreference)pref;
+            final String dictName = dictDumpPref.mDictName;
+            final Intent intent = new Intent(
+                    DictionaryDumpBroadcastReceiver.DICTIONARY_DUMP_INTENT_ACTION);
+            intent.putExtra(DictionaryDumpBroadcastReceiver.DICTIONARY_NAME_KEY, dictName);
+            context.sendBroadcast(intent);
+            return true;
+        }
+        return true;
+    }
+
+    @Override
+    public void onStop() {
+        super.onStop();
+        if (mServiceNeedsRestart) {
+            Process.killProcess(Process.myPid());
+        }
+    }
+
+    @Override
+    public void onSharedPreferenceChanged(final SharedPreferences prefs, final String key) {
+        if (key.equals(DebugSettings.PREF_DEBUG_MODE) && mDebugMode != null) {
+            mDebugMode.setChecked(prefs.getBoolean(DebugSettings.PREF_DEBUG_MODE, false));
+            updateDebugMode();
+            mServiceNeedsRestart = true;
+            return;
+        }
+        if (key.equals(DebugSettings.PREF_FORCE_NON_DISTINCT_MULTITOUCH)) {
+            mServiceNeedsRestart = true;
+            return;
+        }
+    }
+
+    private void updateDebugMode() {
+        boolean isDebugMode = mDebugMode.isChecked();
+        final String version = getString(
+                R.string.version_text, ApplicationUtils.getVersionName(getActivity()));
+        if (!isDebugMode) {
+            mDebugMode.setTitle(version);
+            mDebugMode.setSummary(null);
+        } else {
+            mDebugMode.setTitle(getString(R.string.prefs_debug_mode));
+            mDebugMode.setSummary(version);
+        }
+    }
+
+    private void setupKeyLongpressTimeoutSettings() {
+        final SharedPreferences prefs = getSharedPreferences();
+        final Resources res = getResources();
+        final SeekBarDialogPreference pref = (SeekBarDialogPreference)findPreference(
+                DebugSettings.PREF_KEY_LONGPRESS_TIMEOUT);
+        if (pref == null) {
+            return;
+        }
+        pref.setInterface(new SeekBarDialogPreference.ValueProxy() {
+            @Override
+            public void writeValue(final int value, final String key) {
+                prefs.edit().putInt(key, value).apply();
+            }
+
+            @Override
+            public void writeDefaultValue(final String key) {
+                prefs.edit().remove(key).apply();
+            }
+
+            @Override
+            public int readValue(final String key) {
+                return Settings.readKeyLongpressTimeout(prefs, res);
+            }
+
+            @Override
+            public int readDefaultValue(final String key) {
+                return Settings.readDefaultKeyLongpressTimeout(res);
+            }
+
+            @Override
+            public String getValueText(final int value) {
+                return res.getString(R.string.abbreviation_unit_milliseconds, value);
+            }
+
+            @Override
+            public void feedbackValue(final int value) {}
+        });
+    }
+
+    private void setupKeyPreviewAnimationScale(final String prefKey, final float defaultValue) {
+        final SharedPreferences prefs = getSharedPreferences();
+        final Resources res = getResources();
+        final SeekBarDialogPreference pref = (SeekBarDialogPreference)findPreference(prefKey);
+        if (pref == null) {
+            return;
+        }
+        pref.setInterface(new SeekBarDialogPreference.ValueProxy() {
+            private static final float PERCENTAGE_FLOAT = 100.0f;
+
+            private float getValueFromPercentage(final int percentage) {
+                return percentage / PERCENTAGE_FLOAT;
+            }
+
+            private int getPercentageFromValue(final float floatValue) {
+                return (int)(floatValue * PERCENTAGE_FLOAT);
+            }
+
+            @Override
+            public void writeValue(final int value, final String key) {
+                prefs.edit().putFloat(key, getValueFromPercentage(value)).apply();
+            }
+
+            @Override
+            public void writeDefaultValue(final String key) {
+                prefs.edit().remove(key).apply();
+            }
+
+            @Override
+            public int readValue(final String key) {
+                return getPercentageFromValue(
+                        Settings.readKeyPreviewAnimationScale(prefs, key, defaultValue));
+            }
+
+            @Override
+            public int readDefaultValue(final String key) {
+                return getPercentageFromValue(defaultValue);
+            }
+
+            @Override
+            public String getValueText(final int value) {
+                if (value < 0) {
+                    return res.getString(R.string.settings_system_default);
+                }
+                return String.format(Locale.ROOT, "%d%%", value);
+            }
+
+            @Override
+            public void feedbackValue(final int value) {}
+        });
+    }
+
+    private void setupKeyPreviewAnimationDuration(final String prefKey, final int defaultValue) {
+        final SharedPreferences prefs = getSharedPreferences();
+        final Resources res = getResources();
+        final SeekBarDialogPreference pref = (SeekBarDialogPreference)findPreference(prefKey);
+        if (pref == null) {
+            return;
+        }
+        pref.setInterface(new SeekBarDialogPreference.ValueProxy() {
+            @Override
+            public void writeValue(final int value, final String key) {
+                prefs.edit().putInt(key, value).apply();
+            }
+
+            @Override
+            public void writeDefaultValue(final String key) {
+                prefs.edit().remove(key).apply();
+            }
+
+            @Override
+            public int readValue(final String key) {
+                return Settings.readKeyPreviewAnimationDuration(prefs, key, defaultValue);
+            }
+
+            @Override
+            public int readDefaultValue(final String key) {
+                return defaultValue;
+            }
+
+            @Override
+            public String getValueText(final int value) {
+                return res.getString(R.string.abbreviation_unit_milliseconds, value);
+            }
+
+            @Override
+            public void feedbackValue(final int value) {}
+        });
+    }
+}
diff --git a/java/src/com/android/inputmethod/latin/utils/FragmentUtils.java b/java/src/com/android/inputmethod/latin/utils/FragmentUtils.java
index bb26b57..322e953 100644
--- a/java/src/com/android/inputmethod/latin/utils/FragmentUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/FragmentUtils.java
@@ -20,7 +20,7 @@
 import com.android.inputmethod.latin.about.AboutPreferences;
 import com.android.inputmethod.latin.settings.CorrectionSettingsFragment;
 import com.android.inputmethod.latin.settings.CustomInputStyleSettingsFragment;
-import com.android.inputmethod.latin.settings.DebugSettings;
+import com.android.inputmethod.latin.settings.DebugSettingsFragment;
 import com.android.inputmethod.latin.settings.GestureSettingsFragment;
 import com.android.inputmethod.latin.settings.InputSettingsFragment;
 import com.android.inputmethod.latin.settings.MultiLingualSettingsFragment;
@@ -43,7 +43,7 @@
         sLatinImeFragments.add(CustomInputStyleSettingsFragment.class.getName());
         sLatinImeFragments.add(GestureSettingsFragment.class.getName());
         sLatinImeFragments.add(CorrectionSettingsFragment.class.getName());
-        sLatinImeFragments.add(DebugSettings.class.getName());
+        sLatinImeFragments.add(DebugSettingsFragment.class.getName());
         sLatinImeFragments.add(SettingsFragment.class.getName());
         sLatinImeFragments.add(SpellCheckerSettingsFragment.class.getName());
         sLatinImeFragments.add(UserDictionaryAddWordFragment.class.getName());