DisplaySettings.java revision 333efe90978beeed36a45df6b45a7d7119140bb4 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.settings;
18
19import com.android.settings.search.BaseSearchIndexProvider;
20import com.android.settings.search.Indexable;
21
22import static android.provider.Settings.Secure.WAKE_GESTURE_ENABLED;
23import static android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE;
24import static android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
25import static android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL;
26import static android.provider.Settings.System.SCREEN_OFF_TIMEOUT;
27
28import android.app.ActivityManagerNative;
29import android.app.Dialog;
30import android.app.admin.DevicePolicyManager;
31import android.content.ContentResolver;
32import android.content.Context;
33import android.content.res.Configuration;
34import android.content.res.Resources;
35import android.hardware.Sensor;
36import android.hardware.SensorManager;
37import android.os.Bundle;
38import android.os.RemoteException;
39import android.preference.ListPreference;
40import android.preference.Preference;
41import android.preference.Preference.OnPreferenceClickListener;
42import android.preference.PreferenceScreen;
43import android.preference.SwitchPreference;
44import android.provider.SearchIndexableResource;
45import android.provider.Settings;
46import android.util.Log;
47
48import java.util.ArrayList;
49import java.util.List;
50
51public class DisplaySettings extends SettingsPreferenceFragment implements
52        Preference.OnPreferenceChangeListener, OnPreferenceClickListener, Indexable {
53    private static final String TAG = "DisplaySettings";
54
55    /** If there is no setting in the provider, use this. */
56    private static final int FALLBACK_SCREEN_TIMEOUT_VALUE = 30000;
57
58    private static final String KEY_SCREEN_TIMEOUT = "screen_timeout";
59    private static final String KEY_FONT_SIZE = "font_size";
60    private static final String KEY_SCREEN_SAVER = "screensaver";
61    private static final String KEY_LIFT_TO_WAKE = "lift_to_wake";
62    private static final String KEY_AUTO_BRIGHTNESS = "auto_brightness";
63
64    private static final int DLG_GLOBAL_CHANGE_WARNING = 1;
65
66    private WarnedListPreference mFontSizePref;
67
68    private final Configuration mCurConfig = new Configuration();
69
70    private ListPreference mScreenTimeoutPreference;
71    private Preference mScreenSaverPreference;
72    private SwitchPreference mLiftToWakePreference;
73    private SwitchPreference mAutoBrightnessPreference;
74
75    @Override
76    public void onCreate(Bundle savedInstanceState) {
77        super.onCreate(savedInstanceState);
78        final ContentResolver resolver = getActivity().getContentResolver();
79
80        addPreferencesFromResource(R.xml.display_settings);
81
82        mScreenSaverPreference = findPreference(KEY_SCREEN_SAVER);
83        if (mScreenSaverPreference != null
84                && getResources().getBoolean(
85                        com.android.internal.R.bool.config_dreamsSupported) == false) {
86            getPreferenceScreen().removePreference(mScreenSaverPreference);
87        }
88
89        mScreenTimeoutPreference = (ListPreference) findPreference(KEY_SCREEN_TIMEOUT);
90        final long currentTimeout = Settings.System.getLong(resolver, SCREEN_OFF_TIMEOUT,
91                FALLBACK_SCREEN_TIMEOUT_VALUE);
92        mScreenTimeoutPreference.setValue(String.valueOf(currentTimeout));
93        mScreenTimeoutPreference.setOnPreferenceChangeListener(this);
94        disableUnusableTimeouts(mScreenTimeoutPreference);
95        updateTimeoutPreferenceDescription(currentTimeout);
96
97        mFontSizePref = (WarnedListPreference) findPreference(KEY_FONT_SIZE);
98        mFontSizePref.setOnPreferenceChangeListener(this);
99        mFontSizePref.setOnPreferenceClickListener(this);
100
101        if (isAutomaticBrightnessAvailable(getResources())) {
102            mAutoBrightnessPreference = (SwitchPreference) findPreference(KEY_AUTO_BRIGHTNESS);
103            mAutoBrightnessPreference.setOnPreferenceChangeListener(this);
104        } else {
105            removePreference(KEY_AUTO_BRIGHTNESS);
106        }
107
108        if (isLiftToWakeAvailable(getActivity())) {
109            mLiftToWakePreference = (SwitchPreference) findPreference(KEY_LIFT_TO_WAKE);
110            mLiftToWakePreference.setOnPreferenceChangeListener(this);
111        } else {
112            removePreference(KEY_LIFT_TO_WAKE);
113        }
114    }
115
116    private static boolean isLiftToWakeAvailable(Context context) {
117        SensorManager sensors = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
118        return sensors != null && sensors.getDefaultSensor(Sensor.TYPE_WAKE_GESTURE) != null;
119    }
120
121    private static boolean isAutomaticBrightnessAvailable(Resources res) {
122        return res.getBoolean(com.android.internal.R.bool.config_automatic_brightness_available);
123    }
124
125    private void updateTimeoutPreferenceDescription(long currentTimeout) {
126        ListPreference preference = mScreenTimeoutPreference;
127        String summary;
128        if (currentTimeout < 0) {
129            // Unsupported value
130            summary = "";
131        } else {
132            final CharSequence[] entries = preference.getEntries();
133            final CharSequence[] values = preference.getEntryValues();
134            if (entries == null || entries.length == 0) {
135                summary = "";
136            } else {
137                int best = 0;
138                for (int i = 0; i < values.length; i++) {
139                    long timeout = Long.parseLong(values[i].toString());
140                    if (currentTimeout >= timeout) {
141                        best = i;
142                    }
143                }
144                summary = preference.getContext().getString(R.string.screen_timeout_summary,
145                        entries[best]);
146            }
147        }
148        preference.setSummary(summary);
149    }
150
151    private void disableUnusableTimeouts(ListPreference screenTimeoutPreference) {
152        final DevicePolicyManager dpm =
153                (DevicePolicyManager) getActivity().getSystemService(
154                Context.DEVICE_POLICY_SERVICE);
155        final long maxTimeout = dpm != null ? dpm.getMaximumTimeToLock(null) : 0;
156        if (maxTimeout == 0) {
157            return; // policy not enforced
158        }
159        final CharSequence[] entries = screenTimeoutPreference.getEntries();
160        final CharSequence[] values = screenTimeoutPreference.getEntryValues();
161        ArrayList<CharSequence> revisedEntries = new ArrayList<CharSequence>();
162        ArrayList<CharSequence> revisedValues = new ArrayList<CharSequence>();
163        for (int i = 0; i < values.length; i++) {
164            long timeout = Long.parseLong(values[i].toString());
165            if (timeout <= maxTimeout) {
166                revisedEntries.add(entries[i]);
167                revisedValues.add(values[i]);
168            }
169        }
170        if (revisedEntries.size() != entries.length || revisedValues.size() != values.length) {
171            final int userPreference = Integer.parseInt(screenTimeoutPreference.getValue());
172            screenTimeoutPreference.setEntries(
173                    revisedEntries.toArray(new CharSequence[revisedEntries.size()]));
174            screenTimeoutPreference.setEntryValues(
175                    revisedValues.toArray(new CharSequence[revisedValues.size()]));
176            if (userPreference <= maxTimeout) {
177                screenTimeoutPreference.setValue(String.valueOf(userPreference));
178            } else if (revisedValues.size() > 0
179                    && Long.parseLong(revisedValues.get(revisedValues.size() - 1).toString())
180                    == maxTimeout) {
181                // If the last one happens to be the same as the max timeout, select that
182                screenTimeoutPreference.setValue(String.valueOf(maxTimeout));
183            } else {
184                // There will be no highlighted selection since nothing in the list matches
185                // maxTimeout. The user can still select anything less than maxTimeout.
186                // TODO: maybe append maxTimeout to the list and mark selected.
187            }
188        }
189        screenTimeoutPreference.setEnabled(revisedEntries.size() > 0);
190    }
191
192    int floatToIndex(float val) {
193        String[] indices = getResources().getStringArray(R.array.entryvalues_font_size);
194        float lastVal = Float.parseFloat(indices[0]);
195        for (int i=1; i<indices.length; i++) {
196            float thisVal = Float.parseFloat(indices[i]);
197            if (val < (lastVal + (thisVal-lastVal)*.5f)) {
198                return i-1;
199            }
200            lastVal = thisVal;
201        }
202        return indices.length-1;
203    }
204
205    public void readFontSizePreference(ListPreference pref) {
206        try {
207            mCurConfig.updateFrom(ActivityManagerNative.getDefault().getConfiguration());
208        } catch (RemoteException e) {
209            Log.w(TAG, "Unable to retrieve font size");
210        }
211
212        // mark the appropriate item in the preferences list
213        int index = floatToIndex(mCurConfig.fontScale);
214        pref.setValueIndex(index);
215
216        // report the current size in the summary text
217        final Resources res = getResources();
218        String[] fontSizeNames = res.getStringArray(R.array.entries_font_size);
219        pref.setSummary(String.format(res.getString(R.string.summary_font_size),
220                fontSizeNames[index]));
221    }
222
223    @Override
224    public void onResume() {
225        super.onResume();
226        updateState();
227    }
228
229    @Override
230    public Dialog onCreateDialog(int dialogId) {
231        if (dialogId == DLG_GLOBAL_CHANGE_WARNING) {
232            return Utils.buildGlobalChangeWarningDialog(getActivity(),
233                    R.string.global_font_change_title,
234                    new Runnable() {
235                        public void run() {
236                            mFontSizePref.click();
237                        }
238                    });
239        }
240        return null;
241    }
242
243    private void updateState() {
244        readFontSizePreference(mFontSizePref);
245        updateScreenSaverSummary();
246
247        // Update auto brightness if it is available.
248        if (mAutoBrightnessPreference != null) {
249            int brightnessMode = Settings.System.getInt(getContentResolver(),
250                    SCREEN_BRIGHTNESS_MODE, SCREEN_BRIGHTNESS_MODE_MANUAL);
251            mAutoBrightnessPreference.setChecked(brightnessMode != SCREEN_BRIGHTNESS_MODE_MANUAL);
252        }
253
254        // Update lift-to-wake if it is available.
255        if (mLiftToWakePreference != null) {
256            int value = Settings.Secure.getInt(getContentResolver(), WAKE_GESTURE_ENABLED, 0);
257            mLiftToWakePreference.setChecked(value != 0);
258        }
259    }
260
261    private void updateScreenSaverSummary() {
262        if (mScreenSaverPreference != null) {
263            mScreenSaverPreference.setSummary(
264                    DreamSettings.getSummaryTextWithDreamName(getActivity()));
265        }
266    }
267
268    public void writeFontSizePreference(Object objValue) {
269        try {
270            mCurConfig.fontScale = Float.parseFloat(objValue.toString());
271            ActivityManagerNative.getDefault().updatePersistentConfiguration(mCurConfig);
272        } catch (RemoteException e) {
273            Log.w(TAG, "Unable to save font size");
274        }
275    }
276
277    @Override
278    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
279        return super.onPreferenceTreeClick(preferenceScreen, preference);
280    }
281
282    @Override
283    public boolean onPreferenceChange(Preference preference, Object objValue) {
284        final String key = preference.getKey();
285        if (KEY_SCREEN_TIMEOUT.equals(key)) {
286            try {
287                int value = Integer.parseInt((String) objValue);
288                Settings.System.putInt(getContentResolver(), SCREEN_OFF_TIMEOUT, value);
289                updateTimeoutPreferenceDescription(value);
290            } catch (NumberFormatException e) {
291                Log.e(TAG, "could not persist screen timeout setting", e);
292            }
293        }
294        if (KEY_FONT_SIZE.equals(key)) {
295            writeFontSizePreference(objValue);
296        }
297        if (preference == mAutoBrightnessPreference) {
298            boolean auto = (Boolean) objValue;
299            Settings.System.putInt(getContentResolver(), SCREEN_BRIGHTNESS_MODE,
300                    auto ? SCREEN_BRIGHTNESS_MODE_AUTOMATIC : SCREEN_BRIGHTNESS_MODE_MANUAL);
301        }
302        if (preference == mLiftToWakePreference) {
303            boolean value = (Boolean) objValue;
304            Settings.Secure.putInt(getContentResolver(), WAKE_GESTURE_ENABLED, value ? 1 : 0);
305        }
306        return true;
307    }
308
309    @Override
310    public boolean onPreferenceClick(Preference preference) {
311        if (preference == mFontSizePref) {
312            if (Utils.hasMultipleUsers(getActivity())) {
313                showDialog(DLG_GLOBAL_CHANGE_WARNING);
314                return true;
315            } else {
316                mFontSizePref.click();
317            }
318        }
319        return false;
320    }
321
322    public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
323            new BaseSearchIndexProvider() {
324                @Override
325                public List<SearchIndexableResource> getXmlResourcesToIndex(Context context,
326                        boolean enabled) {
327                    ArrayList<SearchIndexableResource> result =
328                            new ArrayList<SearchIndexableResource>();
329
330                    SearchIndexableResource sir = new SearchIndexableResource(context);
331                    sir.xmlResId = R.xml.display_settings;
332                    result.add(sir);
333
334                    return result;
335                }
336
337                @Override
338                public List<String> getNonIndexableKeys(Context context) {
339                    ArrayList<String> result = new ArrayList<String>();
340                    if (!context.getResources().getBoolean(
341                            com.android.internal.R.bool.config_dreamsSupported)) {
342                        result.add(KEY_SCREEN_SAVER);
343                    }
344                    if (!isAutomaticBrightnessAvailable(context.getResources())) {
345                        result.add(KEY_AUTO_BRIGHTNESS);
346                    }
347                    if (!isLiftToWakeAvailable(context)) {
348                        result.add(KEY_LIFT_TO_WAKE);
349                    }
350                    return result;
351                }
352            };
353}
354