src/com/android/settings/DisplaySettings.java - platform/packages/apps/Settings - Git at Google

 /*
  * 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 static android.provider.Settings.System.SCREEN_OFF_TIMEOUT;

 import android.app.ActivityManagerNative;
 import android.app.Dialog;
 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.os.Bundle;
 import android.os.RemoteException;
 import android.preference.CheckBoxPreference;
 import android.preference.ListPreference;
 import android.preference.Preference;
 import android.preference.Preference.OnPreferenceClickListener;
 import android.preference.PreferenceScreen;
 import android.provider.Settings;
 import android.provider.Settings.SettingNotFoundException;
 import android.util.Log;

 import com.android.internal.view.RotationPolicy;
 import com.android.settings.DreamSettings;

 import java.util.ArrayList;

 public class DisplaySettings extends SettingsPreferenceFragment implements
         Preference.OnPreferenceChangeListener, OnPreferenceClickListener {
     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_ACCELEROMETER = "accelerometer";
     private static final String KEY_FONT_SIZE = "font_size";
     private static final String KEY_NOTIFICATION_PULSE = "notification_pulse";
     private static final String KEY_SCREEN_SAVER = "screensaver";

     private static final int DLG_GLOBAL_CHANGE_WARNING = 1;

     private CheckBoxPreference mAccelerometer;
     private WarnedListPreference mFontSizePref;
     private CheckBoxPreference mNotificationPulse;

     private final Configuration mCurConfig = new Configuration();

     private ListPreference mScreenTimeoutPreference;
     private Preference mScreenSaverPreference;

     private final RotationPolicy.RotationPolicyListener mRotationPolicyListener =
             new RotationPolicy.RotationPolicyListener() {
         @Override
         public void onChange() {
             updateAccelerometerRotationCheckbox();
         }
     };

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

         addPreferencesFromResource(R.xml.display_settings);

         mAccelerometer = (CheckBoxPreference) findPreference(KEY_ACCELEROMETER);
         mAccelerometer.setPersistent(false);
         if (!RotationPolicy.isRotationSupported(getActivity())
                 || RotationPolicy.isRotationLockToggleSupported(getActivity())) {
             // If rotation lock is supported, then we do not provide this option in
             // Display settings.  However, is still available in Accessibility settings,
             // if the device supports rotation.
             getPreferenceScreen().removePreference(mAccelerometer);
         }

         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 = (WarnedListPreference) findPreference(KEY_FONT_SIZE);
         mFontSizePref.setOnPreferenceChangeListener(this);
         mFontSizePref.setOnPreferenceClickListener(this);
         mNotificationPulse = (CheckBoxPreference) findPreference(KEY_NOTIFICATION_PULSE);
         if (mNotificationPulse != null
                 && getResources().getBoolean(
                         com.android.internal.R.bool.config_intrusiveNotificationLed) == false) {
             getPreferenceScreen().removePreference(mNotificationPulse);
         } else {
             try {
                 mNotificationPulse.setChecked(Settings.System.getInt(resolver,
                         Settings.System.NOTIFICATION_LIGHT_PULSE) == 1);
                 mNotificationPulse.setOnPreferenceChangeListener(this);
             } catch (SettingNotFoundException snfe) {
                 Log.e(TAG, Settings.System.NOTIFICATION_LIGHT_PULSE + " not found");
             }
         }
     }

     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();

         RotationPolicy.registerRotationPolicyListener(getActivity(),
                 mRotationPolicyListener);

         updateState();
     }

     @Override
     public void onPause() {
         super.onPause();

         RotationPolicy.unregisterRotationPolicyListener(getActivity(),
                 mRotationPolicyListener);
     }

     @Override
     public Dialog onCreateDialog(int dialogId) {
         if (dialogId == DLG_GLOBAL_CHANGE_WARNING) {
             return Utils.buildGlobalChangeWarningDialog(getActivity(),
                     R.string.global_font_change_title,
                     new Runnable() {
                         public void run() {
                             mFontSizePref.click();
                         }
                     });
         }
         return null;
     }

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

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

     private void updateAccelerometerRotationCheckbox() {
         if (getActivity() == null) return;

         mAccelerometer.setChecked(!RotationPolicy.isRotationLocked(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 onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
         if (preference == mAccelerometer) {
             RotationPolicy.setRotationLockForAccessibility(
                     getActivity(), !mAccelerometer.isChecked());
         } else if (preference == mNotificationPulse) {
             boolean value = mNotificationPulse.isChecked();
             Settings.System.putInt(getContentResolver(), Settings.System.NOTIFICATION_LIGHT_PULSE,
                     value ? 1 : 0);
             return true;
         }
         return super.onPreferenceTreeClick(preferenceScreen, preference);
     }

     @Override
     public boolean onPreferenceChange(Preference preference, Object objValue) {
         final String key = preference.getKey();
         if (KEY_SCREEN_TIMEOUT.equals(key)) {
             int value = Integer.parseInt((String) objValue);
             try {
                 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);
         }

         return true;
     }

     @Override
     public boolean onPreferenceClick(Preference preference) {
         if (preference == mFontSizePref) {
             if (Utils.hasMultipleUsers(getActivity())) {
                 showDialog(DLG_GLOBAL_CHANGE_WARNING);
                 return true;
             } else {
                 mFontSizePref.click();
             }
         }
         return false;
     }
 }
	/*
	* 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 static android.provider.Settings.System.SCREEN_OFF_TIMEOUT;

	import android.app.ActivityManagerNative;
	import android.app.Dialog;
	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.os.Bundle;
	import android.os.RemoteException;
	import android.preference.CheckBoxPreference;
	import android.preference.ListPreference;
	import android.preference.Preference;
	import android.preference.Preference.OnPreferenceClickListener;
	import android.preference.PreferenceScreen;
	import android.provider.Settings;
	import android.provider.Settings.SettingNotFoundException;
	import android.util.Log;

	import com.android.internal.view.RotationPolicy;
	import com.android.settings.DreamSettings;

	import java.util.ArrayList;

	public class DisplaySettings extends SettingsPreferenceFragment implements
	Preference.OnPreferenceChangeListener, OnPreferenceClickListener {
	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_ACCELEROMETER = "accelerometer";
	private static final String KEY_FONT_SIZE = "font_size";
	private static final String KEY_NOTIFICATION_PULSE = "notification_pulse";
	private static final String KEY_SCREEN_SAVER = "screensaver";

	private static final int DLG_GLOBAL_CHANGE_WARNING = 1;

	private CheckBoxPreference mAccelerometer;
	private WarnedListPreference mFontSizePref;
	private CheckBoxPreference mNotificationPulse;

	private final Configuration mCurConfig = new Configuration();

	private ListPreference mScreenTimeoutPreference;
	private Preference mScreenSaverPreference;

	private final RotationPolicy.RotationPolicyListener mRotationPolicyListener =
	new RotationPolicy.RotationPolicyListener() {
	@Override
	public void onChange() {
	updateAccelerometerRotationCheckbox();
	}
	};

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

	addPreferencesFromResource(R.xml.display_settings);

	mAccelerometer = (CheckBoxPreference) findPreference(KEY_ACCELEROMETER);
	mAccelerometer.setPersistent(false);
	if (!RotationPolicy.isRotationSupported(getActivity())
	\|\| RotationPolicy.isRotationLockToggleSupported(getActivity())) {
	// If rotation lock is supported, then we do not provide this option in
	// Display settings. However, is still available in Accessibility settings,
	// if the device supports rotation.
	getPreferenceScreen().removePreference(mAccelerometer);
	}

	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 = (WarnedListPreference) findPreference(KEY_FONT_SIZE);
	mFontSizePref.setOnPreferenceChangeListener(this);
	mFontSizePref.setOnPreferenceClickListener(this);
	mNotificationPulse = (CheckBoxPreference) findPreference(KEY_NOTIFICATION_PULSE);
	if (mNotificationPulse != null
	&& getResources().getBoolean(
	com.android.internal.R.bool.config_intrusiveNotificationLed) == false) {
	getPreferenceScreen().removePreference(mNotificationPulse);
	} else {
	try {
	mNotificationPulse.setChecked(Settings.System.getInt(resolver,
	Settings.System.NOTIFICATION_LIGHT_PULSE) == 1);
	mNotificationPulse.setOnPreferenceChangeListener(this);
	} catch (SettingNotFoundException snfe) {
	Log.e(TAG, Settings.System.NOTIFICATION_LIGHT_PULSE + " not found");
	}
	}
	}

	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();

	RotationPolicy.registerRotationPolicyListener(getActivity(),
	mRotationPolicyListener);

	updateState();
	}

	@Override
	public void onPause() {
	super.onPause();

	RotationPolicy.unregisterRotationPolicyListener(getActivity(),
	mRotationPolicyListener);
	}

	@Override
	public Dialog onCreateDialog(int dialogId) {
	if (dialogId == DLG_GLOBAL_CHANGE_WARNING) {
	return Utils.buildGlobalChangeWarningDialog(getActivity(),
	R.string.global_font_change_title,
	new Runnable() {
	public void run() {
	mFontSizePref.click();
	}
	});
	}
	return null;
	}

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

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

	private void updateAccelerometerRotationCheckbox() {
	if (getActivity() == null) return;

	mAccelerometer.setChecked(!RotationPolicy.isRotationLocked(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 onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
	if (preference == mAccelerometer) {
	RotationPolicy.setRotationLockForAccessibility(
	getActivity(), !mAccelerometer.isChecked());
	} else if (preference == mNotificationPulse) {
	boolean value = mNotificationPulse.isChecked();
	Settings.System.putInt(getContentResolver(), Settings.System.NOTIFICATION_LIGHT_PULSE,
	value ? 1 : 0);
	return true;
	}
	return super.onPreferenceTreeClick(preferenceScreen, preference);
	}

	@Override
	public boolean onPreferenceChange(Preference preference, Object objValue) {
	final String key = preference.getKey();
	if (KEY_SCREEN_TIMEOUT.equals(key)) {
	int value = Integer.parseInt((String) objValue);
	try {
	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);
	}

	return true;
	}

	@Override
	public boolean onPreferenceClick(Preference preference) {
	if (preference == mFontSizePref) {
	if (Utils.hasMultipleUsers(getActivity())) {
	showDialog(DLG_GLOBAL_CHANGE_WARNING);
	return true;
	} else {
	mFontSizePref.click();
	}
	}
	return false;
	}
	}