src/com/android/settings/DisplaySettings.java - LeafOS-Project/android_packages_apps_Settings - Gitiles

 /*
  * Copyright (C) 2010 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.settings;

 import android.app.Activity;
 import android.app.ActivityManagerNative;
 import android.app.UiModeManager;
 import android.app.admin.DevicePolicyManager;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.hardware.Sensor;
 import android.hardware.SensorManager;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.RemoteException;
 import android.os.SystemProperties;
 import android.provider.SearchIndexableResource;
 import android.provider.Settings;
 import android.support.v14.preference.SwitchPreference;
 import android.support.v7.preference.ListPreference;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.Preference.OnPreferenceChangeListener;
 import android.text.TextUtils;
 import android.util.Log;

 import com.android.internal.logging.MetricsLogger;
 import com.android.internal.view.RotationPolicy;
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settings.search.Indexable;

 import java.util.ArrayList;
 import java.util.List;

 import static android.provider.Settings.Secure.CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED;
 import static android.provider.Settings.Secure.CAMERA_GESTURE_DISABLED;
 import static android.provider.Settings.Secure.DOUBLE_TAP_TO_WAKE;
 import static android.provider.Settings.Secure.DOZE_ENABLED;
 import static android.provider.Settings.Secure.WAKE_GESTURE_ENABLED;
 import static android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE;
 import static android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
 import static android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL;
 import static android.provider.Settings.System.SCREEN_OFF_TIMEOUT;

 public class DisplaySettings extends SettingsPreferenceFragment implements
         Preference.OnPreferenceChangeListener, Indexable {
     private static final String TAG = "DisplaySettings";

     /** If there is no setting in the provider, use this. */
     private static final int FALLBACK_SCREEN_TIMEOUT_VALUE = 30000;

     private static final String KEY_SCREEN_TIMEOUT = "screen_timeout";
     private static final String KEY_FONT_SIZE = "font_size";
     private static final String KEY_SCREEN_SAVER = "screensaver";
     private static final String KEY_LIFT_TO_WAKE = "lift_to_wake";
     private static final String KEY_DOZE = "doze";
     private static final String KEY_TAP_TO_WAKE = "tap_to_wake";
     private static final String KEY_AUTO_BRIGHTNESS = "auto_brightness";
     private static final String KEY_AUTO_ROTATE = "auto_rotate";
     private static final String KEY_NIGHT_MODE = "night_mode";
     private static final String KEY_CAMERA_GESTURE = "camera_gesture";
     private static final String KEY_CAMERA_DOUBLE_TAP_POWER_GESTURE
             = "camera_double_tap_power_gesture";

     private DropDownPreference mFontSizePref;

     private final Configuration mCurConfig = new Configuration();

     private ListPreference mScreenTimeoutPreference;
     private ListPreference mNightModePreference;
     private Preference mScreenSaverPreference;
     private SwitchPreference mLiftToWakePreference;
     private SwitchPreference mDozePreference;
     private SwitchPreference mTapToWakePreference;
     private SwitchPreference mAutoBrightnessPreference;
     private SwitchPreference mCameraGesturePreference;
     private SwitchPreference mCameraDoubleTapPowerGesturePreference;

     @Override
     protected int getMetricsCategory() {
         return MetricsLogger.DISPLAY;
     }

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         final Activity activity = getActivity();
         final ContentResolver resolver = activity.getContentResolver();

         addPreferencesFromResource(R.xml.display_settings);

         mScreenSaverPreference = findPreference(KEY_SCREEN_SAVER);
         if (mScreenSaverPreference != null
                 && getResources().getBoolean(
                         com.android.internal.R.bool.config_dreamsSupported) == false) {
             getPreferenceScreen().removePreference(mScreenSaverPreference);
         }

         mScreenTimeoutPreference = (ListPreference) findPreference(KEY_SCREEN_TIMEOUT);
         final long currentTimeout = Settings.System.getLong(resolver, SCREEN_OFF_TIMEOUT,
                 FALLBACK_SCREEN_TIMEOUT_VALUE);
         mScreenTimeoutPreference.setValue(String.valueOf(currentTimeout));
         mScreenTimeoutPreference.setOnPreferenceChangeListener(this);
         disableUnusableTimeouts(mScreenTimeoutPreference);
         updateTimeoutPreferenceDescription(currentTimeout);

         mFontSizePref = (DropDownPreference) findPreference(KEY_FONT_SIZE);
         mFontSizePref.setOnPreferenceChangeListener(this);

         if (isAutomaticBrightnessAvailable(getResources())) {
             mAutoBrightnessPreference = (SwitchPreference) findPreference(KEY_AUTO_BRIGHTNESS);
             mAutoBrightnessPreference.setOnPreferenceChangeListener(this);
         } else {
             removePreference(KEY_AUTO_BRIGHTNESS);
         }

         if (isLiftToWakeAvailable(activity)) {
             mLiftToWakePreference = (SwitchPreference) findPreference(KEY_LIFT_TO_WAKE);
             mLiftToWakePreference.setOnPreferenceChangeListener(this);
         } else {
             removePreference(KEY_LIFT_TO_WAKE);
         }

         if (isDozeAvailable(activity)) {
             mDozePreference = (SwitchPreference) findPreference(KEY_DOZE);
             mDozePreference.setOnPreferenceChangeListener(this);
         } else {
             removePreference(KEY_DOZE);
         }

         if (isTapToWakeAvailable(getResources())) {
             mTapToWakePreference = (SwitchPreference) findPreference(KEY_TAP_TO_WAKE);
             mTapToWakePreference.setOnPreferenceChangeListener(this);
         } else {
             removePreference(KEY_TAP_TO_WAKE);
         }

         if (isCameraGestureAvailable(getResources())) {
             mCameraGesturePreference = (SwitchPreference) findPreference(KEY_CAMERA_GESTURE);
             mCameraGesturePreference.setOnPreferenceChangeListener(this);
         } else {
             removePreference(KEY_CAMERA_GESTURE);
         }

         if (isCameraDoubleTapPowerGestureAvailable(getResources())) {
             mCameraDoubleTapPowerGesturePreference
                     = (SwitchPreference) findPreference(KEY_CAMERA_DOUBLE_TAP_POWER_GESTURE);
             mCameraDoubleTapPowerGesturePreference.setOnPreferenceChangeListener(this);
         } else {
             removePreference(KEY_CAMERA_DOUBLE_TAP_POWER_GESTURE);
         }

         if (RotationPolicy.isRotationLockToggleVisible(activity)) {
             DropDownPreference rotatePreference =
                     (DropDownPreference) findPreference(KEY_AUTO_ROTATE);
             int rotateLockedResourceId;
             // The following block sets the string used when rotation is locked.
             // If the device locks specifically to portrait or landscape (rather than current
             // rotation), then we use a different string to include this information.
             if (allowAllRotations(activity)) {
                 rotateLockedResourceId = R.string.display_auto_rotate_stay_in_current;
             } else {
                 if (RotationPolicy.getRotationLockOrientation(activity)
                         == Configuration.ORIENTATION_PORTRAIT) {
                     rotateLockedResourceId =
                             R.string.display_auto_rotate_stay_in_portrait;
                 } else {
                     rotateLockedResourceId =
                             R.string.display_auto_rotate_stay_in_landscape;
                 }
             }
             rotatePreference.setEntries(new CharSequence[] {
                     activity.getString(R.string.display_auto_rotate_rotate),
                     activity.getString(rotateLockedResourceId),
             });
             rotatePreference.setEntryValues(new CharSequence[] { "0", "1" });
             rotatePreference.setValueIndex(RotationPolicy.isRotationLocked(activity) ?
                     1 : 0);
             rotatePreference.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
                 @Override
                 public boolean onPreferenceChange(Preference preference, Object newValue) {
                     final boolean locked = Integer.parseInt((String) newValue) != 0;
                     MetricsLogger.action(getActivity(), MetricsLogger.ACTION_ROTATION_LOCK,
                             locked);
                     RotationPolicy.setRotationLock(activity, locked);
                     return true;
                 }
             });
         } else {
             removePreference(KEY_AUTO_ROTATE);
         }

         mNightModePreference = (ListPreference) findPreference(KEY_NIGHT_MODE);
         if (mNightModePreference != null) {
             final UiModeManager uiManager = (UiModeManager) getSystemService(
                     Context.UI_MODE_SERVICE);
             final int currentNightMode = uiManager.getNightMode();
             mNightModePreference.setValue(String.valueOf(currentNightMode));
             mNightModePreference.setOnPreferenceChangeListener(this);
         }
     }

     private static boolean allowAllRotations(Context context) {
         return Resources.getSystem().getBoolean(
                 com.android.internal.R.bool.config_allowAllRotations);
     }

     private static boolean isLiftToWakeAvailable(Context context) {
         SensorManager sensors = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
         return sensors != null && sensors.getDefaultSensor(Sensor.TYPE_WAKE_GESTURE) != null;
     }

     private static boolean isDozeAvailable(Context context) {
         String name = Build.IS_DEBUGGABLE ? SystemProperties.get("debug.doze.component") : null;
         if (TextUtils.isEmpty(name)) {
             name = context.getResources().getString(
                     com.android.internal.R.string.config_dozeComponent);
         }
         return !TextUtils.isEmpty(name);
     }

     private static boolean isTapToWakeAvailable(Resources res) {
         return res.getBoolean(com.android.internal.R.bool.config_supportDoubleTapWake);
     }

     private static boolean isAutomaticBrightnessAvailable(Resources res) {
         return res.getBoolean(com.android.internal.R.bool.config_automatic_brightness_available);
     }

     private static boolean isCameraGestureAvailable(Resources res) {
         boolean configSet = res.getInteger(
                 com.android.internal.R.integer.config_cameraLaunchGestureSensorType) != -1;
         return configSet &&
                 !SystemProperties.getBoolean("gesture.disable_camera_launch", false);
     }

     private static boolean isCameraDoubleTapPowerGestureAvailable(Resources res) {
         return res.getBoolean(
                 com.android.internal.R.bool.config_cameraDoubleTapPowerGestureEnabled);
     }

     private void updateTimeoutPreferenceDescription(long currentTimeout) {
         ListPreference preference = mScreenTimeoutPreference;
         String summary;
         if (currentTimeout < 0) {
             // Unsupported value
             summary = "";
         } else {
             final CharSequence[] entries = preference.getEntries();
             final CharSequence[] values = preference.getEntryValues();
             if (entries == null || entries.length == 0) {
                 summary = "";
             } else {
                 int best = 0;
                 for (int i = 0; i < values.length; i++) {
                     long timeout = Long.parseLong(values[i].toString());
                     if (currentTimeout >= timeout) {
                         best = i;
                     }
                 }
                 summary = preference.getContext().getString(R.string.screen_timeout_summary,
                         entries[best]);
             }
         }
         preference.setSummary(summary);
     }

     private void disableUnusableTimeouts(ListPreference screenTimeoutPreference) {
         final DevicePolicyManager dpm =
                 (DevicePolicyManager) getActivity().getSystemService(
                 Context.DEVICE_POLICY_SERVICE);
         final long maxTimeout = dpm != null ? dpm.getMaximumTimeToLock(null) : 0;
         if (maxTimeout == 0) {
             return; // policy not enforced
         }
         final CharSequence[] entries = screenTimeoutPreference.getEntries();
         final CharSequence[] values = screenTimeoutPreference.getEntryValues();
         ArrayList<CharSequence> revisedEntries = new ArrayList<CharSequence>();
         ArrayList<CharSequence> revisedValues = new ArrayList<CharSequence>();
         for (int i = 0; i < values.length; i++) {
             long timeout = Long.parseLong(values[i].toString());
             if (timeout <= maxTimeout) {
                 revisedEntries.add(entries[i]);
                 revisedValues.add(values[i]);
             }
         }
         if (revisedEntries.size() != entries.length || revisedValues.size() != values.length) {
             final int userPreference = Integer.parseInt(screenTimeoutPreference.getValue());
             screenTimeoutPreference.setEntries(
                     revisedEntries.toArray(new CharSequence[revisedEntries.size()]));
             screenTimeoutPreference.setEntryValues(
                     revisedValues.toArray(new CharSequence[revisedValues.size()]));
             if (userPreference <= maxTimeout) {
                 screenTimeoutPreference.setValue(String.valueOf(userPreference));
             } else if (revisedValues.size() > 0
                     && Long.parseLong(revisedValues.get(revisedValues.size() - 1).toString())
                     == maxTimeout) {
                 // If the last one happens to be the same as the max timeout, select that
                 screenTimeoutPreference.setValue(String.valueOf(maxTimeout));
             } else {
                 // There will be no highlighted selection since nothing in the list matches
                 // maxTimeout. The user can still select anything less than maxTimeout.
                 // TODO: maybe append maxTimeout to the list and mark selected.
             }
         }
         screenTimeoutPreference.setEnabled(revisedEntries.size() > 0);
     }

     int floatToIndex(float val) {
         String[] indices = getResources().getStringArray(R.array.entryvalues_font_size);
         float lastVal = Float.parseFloat(indices[0]);
         for (int i=1; i<indices.length; i++) {
             float thisVal = Float.parseFloat(indices[i]);
             if (val < (lastVal + (thisVal-lastVal)*.5f)) {
                 return i-1;
             }
             lastVal = thisVal;
         }
         return indices.length-1;
     }

     public void readFontSizePreference(ListPreference pref) {
         try {
             mCurConfig.updateFrom(ActivityManagerNative.getDefault().getConfiguration());
         } catch (RemoteException e) {
             Log.w(TAG, "Unable to retrieve font size");
         }

         // mark the appropriate item in the preferences list
         int index = floatToIndex(mCurConfig.fontScale);
         pref.setValueIndex(index);

         // report the current size in the summary text
         final Resources res = getResources();
         String[] fontSizeNames = res.getStringArray(R.array.entries_font_size);
         pref.setSummary(String.format(res.getString(R.string.summary_font_size),
                 fontSizeNames[index]));
     }

     @Override
     public void onResume() {
         super.onResume();
         updateState();
     }

     private void updateState() {
         readFontSizePreference(mFontSizePref);
         updateScreenSaverSummary();

         // Update auto brightness if it is available.
         if (mAutoBrightnessPreference != null) {
             int brightnessMode = Settings.System.getInt(getContentResolver(),
                     SCREEN_BRIGHTNESS_MODE, SCREEN_BRIGHTNESS_MODE_MANUAL);
             mAutoBrightnessPreference.setChecked(brightnessMode != SCREEN_BRIGHTNESS_MODE_MANUAL);
         }

         // Update lift-to-wake if it is available.
         if (mLiftToWakePreference != null) {
             int value = Settings.Secure.getInt(getContentResolver(), WAKE_GESTURE_ENABLED, 0);
             mLiftToWakePreference.setChecked(value != 0);
         }

         // Update doze if it is available.
         if (mDozePreference != null) {
             int value = Settings.Secure.getInt(getContentResolver(), DOZE_ENABLED, 1);
             mDozePreference.setChecked(value != 0);
         }

         // Update tap to wake if it is available.
         if (mTapToWakePreference != null) {
             int value = Settings.Secure.getInt(getContentResolver(), DOUBLE_TAP_TO_WAKE, 0);
             mTapToWakePreference.setChecked(value != 0);
         }

         // Update camera gesture #1 if it is available.
         if (mCameraGesturePreference != null) {
             int value = Settings.Secure.getInt(getContentResolver(), CAMERA_GESTURE_DISABLED, 0);
             mCameraGesturePreference.setChecked(value == 0);
         }

         // Update camera gesture #2 if it is available.
         if (mCameraDoubleTapPowerGesturePreference != null) {
             int value = Settings.Secure.getInt(
                     getContentResolver(), CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED, 0);
             mCameraDoubleTapPowerGesturePreference.setChecked(value == 0);
         }
     }

     private void updateScreenSaverSummary() {
         if (mScreenSaverPreference != null) {
             mScreenSaverPreference.setSummary(
                     DreamSettings.getSummaryTextWithDreamName(getActivity()));
         }
     }

     public void writeFontSizePreference(Object objValue) {
         try {
             mCurConfig.fontScale = Float.parseFloat(objValue.toString());
             ActivityManagerNative.getDefault().updatePersistentConfiguration(mCurConfig);
         } catch (RemoteException e) {
             Log.w(TAG, "Unable to save font size");
         }
     }

     @Override
     public boolean onPreferenceChange(Preference preference, Object objValue) {
         final String key = preference.getKey();
         if (KEY_SCREEN_TIMEOUT.equals(key)) {
             try {
                 int value = Integer.parseInt((String) objValue);
                 Settings.System.putInt(getContentResolver(), SCREEN_OFF_TIMEOUT, value);
                 updateTimeoutPreferenceDescription(value);
             } catch (NumberFormatException e) {
                 Log.e(TAG, "could not persist screen timeout setting", e);
             }
         }
         if (KEY_FONT_SIZE.equals(key)) {
             writeFontSizePreference(objValue);
         }
         if (preference == mAutoBrightnessPreference) {
             boolean auto = (Boolean) objValue;
             Settings.System.putInt(getContentResolver(), SCREEN_BRIGHTNESS_MODE,
                     auto ? SCREEN_BRIGHTNESS_MODE_AUTOMATIC : SCREEN_BRIGHTNESS_MODE_MANUAL);
         }
         if (preference == mLiftToWakePreference) {
             boolean value = (Boolean) objValue;
             Settings.Secure.putInt(getContentResolver(), WAKE_GESTURE_ENABLED, value ? 1 : 0);
         }
         if (preference == mDozePreference) {
             boolean value = (Boolean) objValue;
             Settings.Secure.putInt(getContentResolver(), DOZE_ENABLED, value ? 1 : 0);
         }
         if (preference == mTapToWakePreference) {
             boolean value = (Boolean) objValue;
             Settings.Secure.putInt(getContentResolver(), DOUBLE_TAP_TO_WAKE, value ? 1 : 0);
         }
         if (preference == mCameraGesturePreference) {
             boolean value = (Boolean) objValue;
             Settings.Secure.putInt(getContentResolver(), CAMERA_GESTURE_DISABLED,
                     value ? 0 : 1 /* Backwards because setting is for disabling */);
         }
         if (preference == mCameraDoubleTapPowerGesturePreference) {
             boolean value = (Boolean) objValue;
             Settings.Secure.putInt(getContentResolver(), CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED,
                     value ? 0 : 1 /* Backwards because setting is for disabling */);
         }
         if (preference == mNightModePreference) {
             try {
                 final int value = Integer.parseInt((String) objValue);
                 final UiModeManager uiManager = (UiModeManager) getSystemService(
                         Context.UI_MODE_SERVICE);
                 uiManager.setNightMode(value);
             } catch (NumberFormatException e) {
                 Log.e(TAG, "could not persist night mode setting", e);
             }
         }
         return true;
     }

     @Override
     protected int getHelpResource() {
         return R.string.help_uri_display;
     }

     public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider() {
                 @Override
                 public List<SearchIndexableResource> getXmlResourcesToIndex(Context context,
                         boolean enabled) {
                     ArrayList<SearchIndexableResource> result =
                             new ArrayList<SearchIndexableResource>();

                     SearchIndexableResource sir = new SearchIndexableResource(context);
                     sir.xmlResId = R.xml.display_settings;
                     result.add(sir);

                     return result;
                 }

                 @Override
                 public List<String> getNonIndexableKeys(Context context) {
                     ArrayList<String> result = new ArrayList<String>();
                     if (!context.getResources().getBoolean(
                             com.android.internal.R.bool.config_dreamsSupported)) {
                         result.add(KEY_SCREEN_SAVER);
                     }
                     if (!isAutomaticBrightnessAvailable(context.getResources())) {
                         result.add(KEY_AUTO_BRIGHTNESS);
                     }
                     if (!isLiftToWakeAvailable(context)) {
                         result.add(KEY_LIFT_TO_WAKE);
                     }
                     if (!isDozeAvailable(context)) {
                         result.add(KEY_DOZE);
                     }
                     if (!RotationPolicy.isRotationLockToggleVisible(context)) {
                         result.add(KEY_AUTO_ROTATE);
                     }
                     if (!isTapToWakeAvailable(context.getResources())) {
                         result.add(KEY_TAP_TO_WAKE);
                     }
                     if (!isCameraGestureAvailable(context.getResources())) {
                         result.add(KEY_CAMERA_GESTURE);
                     }
                     if (!isCameraDoubleTapPowerGestureAvailable(context.getResources())) {
                         result.add(KEY_CAMERA_DOUBLE_TAP_POWER_GESTURE);
                     }
                     return result;
                 }
             };
 }
	/*
	* Copyright (C) 2010 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.settings;

	import android.app.Activity;
	import android.app.ActivityManagerNative;
	import android.app.UiModeManager;
	import android.app.admin.DevicePolicyManager;
	import android.content.ContentResolver;
	import android.content.Context;
	import android.content.res.Configuration;
	import android.content.res.Resources;
	import android.hardware.Sensor;
	import android.hardware.SensorManager;
	import android.os.Build;
	import android.os.Bundle;
	import android.os.RemoteException;
	import android.os.SystemProperties;
	import android.provider.SearchIndexableResource;
	import android.provider.Settings;
	import android.support.v14.preference.SwitchPreference;
	import android.support.v7.preference.ListPreference;
	import android.support.v7.preference.Preference;
	import android.support.v7.preference.Preference.OnPreferenceChangeListener;
	import android.text.TextUtils;
	import android.util.Log;

	import com.android.internal.logging.MetricsLogger;
	import com.android.internal.view.RotationPolicy;
	import com.android.settings.search.BaseSearchIndexProvider;
	import com.android.settings.search.Indexable;

	import java.util.ArrayList;
	import java.util.List;

	import static android.provider.Settings.Secure.CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED;
	import static android.provider.Settings.Secure.CAMERA_GESTURE_DISABLED;
	import static android.provider.Settings.Secure.DOUBLE_TAP_TO_WAKE;
	import static android.provider.Settings.Secure.DOZE_ENABLED;
	import static android.provider.Settings.Secure.WAKE_GESTURE_ENABLED;
	import static android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE;
	import static android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
	import static android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL;
	import static android.provider.Settings.System.SCREEN_OFF_TIMEOUT;

	public class DisplaySettings extends SettingsPreferenceFragment implements
	Preference.OnPreferenceChangeListener, Indexable {
	private static final String TAG = "DisplaySettings";

	/** If there is no setting in the provider, use this. */
	private static final int FALLBACK_SCREEN_TIMEOUT_VALUE = 30000;

	private static final String KEY_SCREEN_TIMEOUT = "screen_timeout";
	private static final String KEY_FONT_SIZE = "font_size";
	private static final String KEY_SCREEN_SAVER = "screensaver";
	private static final String KEY_LIFT_TO_WAKE = "lift_to_wake";
	private static final String KEY_DOZE = "doze";
	private static final String KEY_TAP_TO_WAKE = "tap_to_wake";
	private static final String KEY_AUTO_BRIGHTNESS = "auto_brightness";
	private static final String KEY_AUTO_ROTATE = "auto_rotate";
	private static final String KEY_NIGHT_MODE = "night_mode";
	private static final String KEY_CAMERA_GESTURE = "camera_gesture";
	private static final String KEY_CAMERA_DOUBLE_TAP_POWER_GESTURE
	= "camera_double_tap_power_gesture";

	private DropDownPreference mFontSizePref;

	private final Configuration mCurConfig = new Configuration();

	private ListPreference mScreenTimeoutPreference;
	private ListPreference mNightModePreference;
	private Preference mScreenSaverPreference;
	private SwitchPreference mLiftToWakePreference;
	private SwitchPreference mDozePreference;
	private SwitchPreference mTapToWakePreference;
	private SwitchPreference mAutoBrightnessPreference;
	private SwitchPreference mCameraGesturePreference;
	private SwitchPreference mCameraDoubleTapPowerGesturePreference;

	@Override
	protected int getMetricsCategory() {
	return MetricsLogger.DISPLAY;
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	final Activity activity = getActivity();
	final ContentResolver resolver = activity.getContentResolver();

	addPreferencesFromResource(R.xml.display_settings);

	mScreenSaverPreference = findPreference(KEY_SCREEN_SAVER);
	if (mScreenSaverPreference != null
	&& getResources().getBoolean(
	com.android.internal.R.bool.config_dreamsSupported) == false) {
	getPreferenceScreen().removePreference(mScreenSaverPreference);
	}

	mScreenTimeoutPreference = (ListPreference) findPreference(KEY_SCREEN_TIMEOUT);
	final long currentTimeout = Settings.System.getLong(resolver, SCREEN_OFF_TIMEOUT,
	FALLBACK_SCREEN_TIMEOUT_VALUE);
	mScreenTimeoutPreference.setValue(String.valueOf(currentTimeout));
	mScreenTimeoutPreference.setOnPreferenceChangeListener(this);
	disableUnusableTimeouts(mScreenTimeoutPreference);
	updateTimeoutPreferenceDescription(currentTimeout);

	mFontSizePref = (DropDownPreference) findPreference(KEY_FONT_SIZE);
	mFontSizePref.setOnPreferenceChangeListener(this);

	if (isAutomaticBrightnessAvailable(getResources())) {
	mAutoBrightnessPreference = (SwitchPreference) findPreference(KEY_AUTO_BRIGHTNESS);
	mAutoBrightnessPreference.setOnPreferenceChangeListener(this);
	} else {
	removePreference(KEY_AUTO_BRIGHTNESS);
	}

	if (isLiftToWakeAvailable(activity)) {
	mLiftToWakePreference = (SwitchPreference) findPreference(KEY_LIFT_TO_WAKE);
	mLiftToWakePreference.setOnPreferenceChangeListener(this);
	} else {
	removePreference(KEY_LIFT_TO_WAKE);
	}

	if (isDozeAvailable(activity)) {
	mDozePreference = (SwitchPreference) findPreference(KEY_DOZE);
	mDozePreference.setOnPreferenceChangeListener(this);
	} else {
	removePreference(KEY_DOZE);
	}

	if (isTapToWakeAvailable(getResources())) {
	mTapToWakePreference = (SwitchPreference) findPreference(KEY_TAP_TO_WAKE);
	mTapToWakePreference.setOnPreferenceChangeListener(this);
	} else {
	removePreference(KEY_TAP_TO_WAKE);
	}

	if (isCameraGestureAvailable(getResources())) {
	mCameraGesturePreference = (SwitchPreference) findPreference(KEY_CAMERA_GESTURE);
	mCameraGesturePreference.setOnPreferenceChangeListener(this);
	} else {
	removePreference(KEY_CAMERA_GESTURE);
	}

	if (isCameraDoubleTapPowerGestureAvailable(getResources())) {
	mCameraDoubleTapPowerGesturePreference
	= (SwitchPreference) findPreference(KEY_CAMERA_DOUBLE_TAP_POWER_GESTURE);
	mCameraDoubleTapPowerGesturePreference.setOnPreferenceChangeListener(this);
	} else {
	removePreference(KEY_CAMERA_DOUBLE_TAP_POWER_GESTURE);
	}

	if (RotationPolicy.isRotationLockToggleVisible(activity)) {
	DropDownPreference rotatePreference =
	(DropDownPreference) findPreference(KEY_AUTO_ROTATE);
	int rotateLockedResourceId;
	// The following block sets the string used when rotation is locked.
	// If the device locks specifically to portrait or landscape (rather than current
	// rotation), then we use a different string to include this information.
	if (allowAllRotations(activity)) {
	rotateLockedResourceId = R.string.display_auto_rotate_stay_in_current;
	} else {
	if (RotationPolicy.getRotationLockOrientation(activity)
	== Configuration.ORIENTATION_PORTRAIT) {
	rotateLockedResourceId =
	R.string.display_auto_rotate_stay_in_portrait;
	} else {
	rotateLockedResourceId =
	R.string.display_auto_rotate_stay_in_landscape;
	}
	}
	rotatePreference.setEntries(new CharSequence[] {
	activity.getString(R.string.display_auto_rotate_rotate),
	activity.getString(rotateLockedResourceId),
	});
	rotatePreference.setEntryValues(new CharSequence[] { "0", "1" });
	rotatePreference.setValueIndex(RotationPolicy.isRotationLocked(activity) ?
	1 : 0);
	rotatePreference.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
	@Override
	public boolean onPreferenceChange(Preference preference, Object newValue) {
	final boolean locked = Integer.parseInt((String) newValue) != 0;
	MetricsLogger.action(getActivity(), MetricsLogger.ACTION_ROTATION_LOCK,
	locked);
	RotationPolicy.setRotationLock(activity, locked);
	return true;
	}
	});
	} else {
	removePreference(KEY_AUTO_ROTATE);
	}

	mNightModePreference = (ListPreference) findPreference(KEY_NIGHT_MODE);
	if (mNightModePreference != null) {
	final UiModeManager uiManager = (UiModeManager) getSystemService(
	Context.UI_MODE_SERVICE);
	final int currentNightMode = uiManager.getNightMode();
	mNightModePreference.setValue(String.valueOf(currentNightMode));
	mNightModePreference.setOnPreferenceChangeListener(this);
	}
	}

	private static boolean allowAllRotations(Context context) {
	return Resources.getSystem().getBoolean(
	com.android.internal.R.bool.config_allowAllRotations);
	}

	private static boolean isLiftToWakeAvailable(Context context) {
	SensorManager sensors = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
	return sensors != null && sensors.getDefaultSensor(Sensor.TYPE_WAKE_GESTURE) != null;
	}

	private static boolean isDozeAvailable(Context context) {
	String name = Build.IS_DEBUGGABLE ? SystemProperties.get("debug.doze.component") : null;
	if (TextUtils.isEmpty(name)) {
	name = context.getResources().getString(
	com.android.internal.R.string.config_dozeComponent);
	}
	return !TextUtils.isEmpty(name);
	}

	private static boolean isTapToWakeAvailable(Resources res) {
	return res.getBoolean(com.android.internal.R.bool.config_supportDoubleTapWake);
	}

	private static boolean isAutomaticBrightnessAvailable(Resources res) {
	return res.getBoolean(com.android.internal.R.bool.config_automatic_brightness_available);
	}

	private static boolean isCameraGestureAvailable(Resources res) {
	boolean configSet = res.getInteger(
	com.android.internal.R.integer.config_cameraLaunchGestureSensorType) != -1;
	return configSet &&
	!SystemProperties.getBoolean("gesture.disable_camera_launch", false);
	}

	private static boolean isCameraDoubleTapPowerGestureAvailable(Resources res) {
	return res.getBoolean(
	com.android.internal.R.bool.config_cameraDoubleTapPowerGestureEnabled);
	}

	private void updateTimeoutPreferenceDescription(long currentTimeout) {
	ListPreference preference = mScreenTimeoutPreference;
	String summary;
	if (currentTimeout < 0) {
	// Unsupported value
	summary = "";
	} else {
	final CharSequence[] entries = preference.getEntries();
	final CharSequence[] values = preference.getEntryValues();
	if (entries == null \|\| entries.length == 0) {
	summary = "";
	} else {
	int best = 0;
	for (int i = 0; i < values.length; i++) {
	long timeout = Long.parseLong(values[i].toString());
	if (currentTimeout >= timeout) {
	best = i;
	}
	}
	summary = preference.getContext().getString(R.string.screen_timeout_summary,
	entries[best]);
	}
	}
	preference.setSummary(summary);
	}

	private void disableUnusableTimeouts(ListPreference screenTimeoutPreference) {
	final DevicePolicyManager dpm =
	(DevicePolicyManager) getActivity().getSystemService(
	Context.DEVICE_POLICY_SERVICE);
	final long maxTimeout = dpm != null ? dpm.getMaximumTimeToLock(null) : 0;
	if (maxTimeout == 0) {
	return; // policy not enforced
	}
	final CharSequence[] entries = screenTimeoutPreference.getEntries();
	final CharSequence[] values = screenTimeoutPreference.getEntryValues();
	ArrayList<CharSequence> revisedEntries = new ArrayList<CharSequence>();
	ArrayList<CharSequence> revisedValues = new ArrayList<CharSequence>();
	for (int i = 0; i < values.length; i++) {
	long timeout = Long.parseLong(values[i].toString());
	if (timeout <= maxTimeout) {
	revisedEntries.add(entries[i]);
	revisedValues.add(values[i]);
	}
	}
	if (revisedEntries.size() != entries.length \|\| revisedValues.size() != values.length) {
	final int userPreference = Integer.parseInt(screenTimeoutPreference.getValue());
	screenTimeoutPreference.setEntries(
	revisedEntries.toArray(new CharSequence[revisedEntries.size()]));
	screenTimeoutPreference.setEntryValues(
	revisedValues.toArray(new CharSequence[revisedValues.size()]));
	if (userPreference <= maxTimeout) {
	screenTimeoutPreference.setValue(String.valueOf(userPreference));
	} else if (revisedValues.size() > 0
	&& Long.parseLong(revisedValues.get(revisedValues.size() - 1).toString())
	== maxTimeout) {
	// If the last one happens to be the same as the max timeout, select that
	screenTimeoutPreference.setValue(String.valueOf(maxTimeout));
	} else {
	// There will be no highlighted selection since nothing in the list matches
	// maxTimeout. The user can still select anything less than maxTimeout.
	// TODO: maybe append maxTimeout to the list and mark selected.
	}
	}
	screenTimeoutPreference.setEnabled(revisedEntries.size() > 0);
	}

	int floatToIndex(float val) {
	String[] indices = getResources().getStringArray(R.array.entryvalues_font_size);
	float lastVal = Float.parseFloat(indices[0]);
	for (int i=1; i<indices.length; i++) {
	float thisVal = Float.parseFloat(indices[i]);
	if (val < (lastVal + (thisVal-lastVal)*.5f)) {
	return i-1;
	}
	lastVal = thisVal;
	}
	return indices.length-1;
	}

	public void readFontSizePreference(ListPreference pref) {
	try {
	mCurConfig.updateFrom(ActivityManagerNative.getDefault().getConfiguration());
	} catch (RemoteException e) {
	Log.w(TAG, "Unable to retrieve font size");
	}

	// mark the appropriate item in the preferences list
	int index = floatToIndex(mCurConfig.fontScale);
	pref.setValueIndex(index);

	// report the current size in the summary text
	final Resources res = getResources();
	String[] fontSizeNames = res.getStringArray(R.array.entries_font_size);
	pref.setSummary(String.format(res.getString(R.string.summary_font_size),
	fontSizeNames[index]));
	}

	@Override
	public void onResume() {
	super.onResume();
	updateState();
	}

	private void updateState() {
	readFontSizePreference(mFontSizePref);
	updateScreenSaverSummary();

	// Update auto brightness if it is available.
	if (mAutoBrightnessPreference != null) {
	int brightnessMode = Settings.System.getInt(getContentResolver(),
	SCREEN_BRIGHTNESS_MODE, SCREEN_BRIGHTNESS_MODE_MANUAL);
	mAutoBrightnessPreference.setChecked(brightnessMode != SCREEN_BRIGHTNESS_MODE_MANUAL);
	}

	// Update lift-to-wake if it is available.
	if (mLiftToWakePreference != null) {
	int value = Settings.Secure.getInt(getContentResolver(), WAKE_GESTURE_ENABLED, 0);
	mLiftToWakePreference.setChecked(value != 0);
	}

	// Update doze if it is available.
	if (mDozePreference != null) {
	int value = Settings.Secure.getInt(getContentResolver(), DOZE_ENABLED, 1);
	mDozePreference.setChecked(value != 0);
	}

	// Update tap to wake if it is available.
	if (mTapToWakePreference != null) {
	int value = Settings.Secure.getInt(getContentResolver(), DOUBLE_TAP_TO_WAKE, 0);
	mTapToWakePreference.setChecked(value != 0);
	}

	// Update camera gesture #1 if it is available.
	if (mCameraGesturePreference != null) {
	int value = Settings.Secure.getInt(getContentResolver(), CAMERA_GESTURE_DISABLED, 0);
	mCameraGesturePreference.setChecked(value == 0);
	}

	// Update camera gesture #2 if it is available.
	if (mCameraDoubleTapPowerGesturePreference != null) {
	int value = Settings.Secure.getInt(
	getContentResolver(), CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED, 0);
	mCameraDoubleTapPowerGesturePreference.setChecked(value == 0);
	}
	}

	private void updateScreenSaverSummary() {
	if (mScreenSaverPreference != null) {
	mScreenSaverPreference.setSummary(
	DreamSettings.getSummaryTextWithDreamName(getActivity()));
	}
	}

	public void writeFontSizePreference(Object objValue) {
	try {
	mCurConfig.fontScale = Float.parseFloat(objValue.toString());
	ActivityManagerNative.getDefault().updatePersistentConfiguration(mCurConfig);
	} catch (RemoteException e) {
	Log.w(TAG, "Unable to save font size");
	}
	}

	@Override
	public boolean onPreferenceChange(Preference preference, Object objValue) {
	final String key = preference.getKey();
	if (KEY_SCREEN_TIMEOUT.equals(key)) {
	try {
	int value = Integer.parseInt((String) objValue);
	Settings.System.putInt(getContentResolver(), SCREEN_OFF_TIMEOUT, value);
	updateTimeoutPreferenceDescription(value);
	} catch (NumberFormatException e) {
	Log.e(TAG, "could not persist screen timeout setting", e);
	}
	}
	if (KEY_FONT_SIZE.equals(key)) {
	writeFontSizePreference(objValue);
	}
	if (preference == mAutoBrightnessPreference) {
	boolean auto = (Boolean) objValue;
	Settings.System.putInt(getContentResolver(), SCREEN_BRIGHTNESS_MODE,
	auto ? SCREEN_BRIGHTNESS_MODE_AUTOMATIC : SCREEN_BRIGHTNESS_MODE_MANUAL);
	}
	if (preference == mLiftToWakePreference) {
	boolean value = (Boolean) objValue;
	Settings.Secure.putInt(getContentResolver(), WAKE_GESTURE_ENABLED, value ? 1 : 0);
	}
	if (preference == mDozePreference) {
	boolean value = (Boolean) objValue;
	Settings.Secure.putInt(getContentResolver(), DOZE_ENABLED, value ? 1 : 0);
	}
	if (preference == mTapToWakePreference) {
	boolean value = (Boolean) objValue;
	Settings.Secure.putInt(getContentResolver(), DOUBLE_TAP_TO_WAKE, value ? 1 : 0);
	}
	if (preference == mCameraGesturePreference) {
	boolean value = (Boolean) objValue;
	Settings.Secure.putInt(getContentResolver(), CAMERA_GESTURE_DISABLED,
	value ? 0 : 1 /* Backwards because setting is for disabling */);
	}
	if (preference == mCameraDoubleTapPowerGesturePreference) {
	boolean value = (Boolean) objValue;
	Settings.Secure.putInt(getContentResolver(), CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED,
	value ? 0 : 1 /* Backwards because setting is for disabling */);
	}
	if (preference == mNightModePreference) {
	try {
	final int value = Integer.parseInt((String) objValue);
	final UiModeManager uiManager = (UiModeManager) getSystemService(
	Context.UI_MODE_SERVICE);
	uiManager.setNightMode(value);
	} catch (NumberFormatException e) {
	Log.e(TAG, "could not persist night mode setting", e);
	}
	}
	return true;
	}

	@Override
	protected int getHelpResource() {
	return R.string.help_uri_display;
	}

	public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
	new BaseSearchIndexProvider() {
	@Override
	public List<SearchIndexableResource> getXmlResourcesToIndex(Context context,
	boolean enabled) {
	ArrayList<SearchIndexableResource> result =
	new ArrayList<SearchIndexableResource>();

	SearchIndexableResource sir = new SearchIndexableResource(context);
	sir.xmlResId = R.xml.display_settings;
	result.add(sir);

	return result;
	}

	@Override
	public List<String> getNonIndexableKeys(Context context) {
	ArrayList<String> result = new ArrayList<String>();
	if (!context.getResources().getBoolean(
	com.android.internal.R.bool.config_dreamsSupported)) {
	result.add(KEY_SCREEN_SAVER);
	}
	if (!isAutomaticBrightnessAvailable(context.getResources())) {
	result.add(KEY_AUTO_BRIGHTNESS);
	}
	if (!isLiftToWakeAvailable(context)) {
	result.add(KEY_LIFT_TO_WAKE);
	}
	if (!isDozeAvailable(context)) {
	result.add(KEY_DOZE);
	}
	if (!RotationPolicy.isRotationLockToggleVisible(context)) {
	result.add(KEY_AUTO_ROTATE);
	}
	if (!isTapToWakeAvailable(context.getResources())) {
	result.add(KEY_TAP_TO_WAKE);
	}
	if (!isCameraGestureAvailable(context.getResources())) {
	result.add(KEY_CAMERA_GESTURE);
	}
	if (!isCameraDoubleTapPowerGestureAvailable(context.getResources())) {
	result.add(KEY_CAMERA_DOUBLE_TAP_POWER_GESTURE);
	}
	return result;
	}
	};
	}