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      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 
     17 package com.android.settings;
     18 
     19 import static android.provider.Settings.System.SCREEN_OFF_TIMEOUT;
     20 
     21 import java.util.ArrayList;
     22 
     23 import android.app.admin.DevicePolicyManager;
     24 import android.content.ContentResolver;
     25 import android.content.Context;
     26 import android.os.Bundle;
     27 import android.os.RemoteException;
     28 import android.os.ServiceManager;
     29 import android.preference.CheckBoxPreference;
     30 import android.preference.ListPreference;
     31 import android.preference.Preference;
     32 import android.preference.PreferenceActivity;
     33 import android.preference.PreferenceScreen;
     34 import android.provider.Settings;
     35 import android.util.Log;
     36 import android.view.IWindowManager;
     37 
     38 public class DisplaySettings extends PreferenceActivity implements
     39         Preference.OnPreferenceChangeListener {
     40     private static final String TAG = "DisplaySettings";
     41 
     42     /** If there is no setting in the provider, use this. */
     43     private static final int FALLBACK_SCREEN_TIMEOUT_VALUE = 30000;
     44 
     45     private static final String KEY_SCREEN_TIMEOUT = "screen_timeout";
     46     private static final String KEY_ANIMATIONS = "animations";
     47     private static final String KEY_ACCELEROMETER = "accelerometer";
     48 
     49     private ListPreference mAnimations;
     50     private CheckBoxPreference mAccelerometer;
     51     private float[] mAnimationScales;
     52 
     53     private IWindowManager mWindowManager;
     54 
     55     @Override
     56     protected void onCreate(Bundle savedInstanceState) {
     57         super.onCreate(savedInstanceState);
     58         ContentResolver resolver = getContentResolver();
     59         mWindowManager = IWindowManager.Stub.asInterface(ServiceManager.getService("window"));
     60 
     61         addPreferencesFromResource(R.xml.display_settings);
     62 
     63         mAnimations = (ListPreference) findPreference(KEY_ANIMATIONS);
     64         mAnimations.setOnPreferenceChangeListener(this);
     65         mAccelerometer = (CheckBoxPreference) findPreference(KEY_ACCELEROMETER);
     66         mAccelerometer.setPersistent(false);
     67 
     68         ListPreference screenTimeoutPreference =
     69             (ListPreference) findPreference(KEY_SCREEN_TIMEOUT);
     70         screenTimeoutPreference.setValue(String.valueOf(Settings.System.getInt(
     71                 resolver, SCREEN_OFF_TIMEOUT, FALLBACK_SCREEN_TIMEOUT_VALUE)));
     72         screenTimeoutPreference.setOnPreferenceChangeListener(this);
     73         disableUnusableTimeouts(screenTimeoutPreference);
     74     }
     75 
     76     private void disableUnusableTimeouts(ListPreference screenTimeoutPreference) {
     77         final DevicePolicyManager dpm =
     78             (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
     79         final long maxTimeout = dpm != null ? dpm.getMaximumTimeToLock(null) : 0;
     80         if (maxTimeout == 0) {
     81             return; // policy not enforced
     82         }
     83         final CharSequence[] entries = screenTimeoutPreference.getEntries();
     84         final CharSequence[] values = screenTimeoutPreference.getEntryValues();
     85         ArrayList<CharSequence> revisedEntries = new ArrayList<CharSequence>();
     86         ArrayList<CharSequence> revisedValues = new ArrayList<CharSequence>();
     87         for (int i = 0; i < values.length; i++) {
     88             long timeout = Long.valueOf(values[i].toString());
     89             if (timeout <= maxTimeout) {
     90                 revisedEntries.add(entries[i]);
     91                 revisedValues.add(values[i]);
     92             }
     93         }
     94         if (revisedEntries.size() != entries.length || revisedValues.size() != values.length) {
     95             screenTimeoutPreference.setEntries(
     96                     revisedEntries.toArray(new CharSequence[revisedEntries.size()]));
     97             screenTimeoutPreference.setEntryValues(
     98                     revisedValues.toArray(new CharSequence[revisedValues.size()]));
     99             final int userPreference = Integer.valueOf(screenTimeoutPreference.getValue());
    100             if (userPreference <= maxTimeout) {
    101                 screenTimeoutPreference.setValue(String.valueOf(userPreference));
    102             } else {
    103                 // There will be no highlighted selection since nothing in the list matches
    104                 // maxTimeout. The user can still select anything less than maxTimeout.
    105                 // TODO: maybe append maxTimeout to the list and mark selected.
    106             }
    107         }
    108         screenTimeoutPreference.setEnabled(revisedEntries.size() > 0);
    109     }
    110 
    111     @Override
    112     protected void onResume() {
    113         super.onResume();
    114 
    115         updateState(true);
    116     }
    117 
    118     private void updateState(boolean force) {
    119         int animations = 0;
    120         try {
    121             mAnimationScales = mWindowManager.getAnimationScales();
    122         } catch (RemoteException e) {
    123         }
    124         if (mAnimationScales != null) {
    125             if (mAnimationScales.length >= 1) {
    126                 animations = ((int)(mAnimationScales[0]+.5f)) % 10;
    127             }
    128             if (mAnimationScales.length >= 2) {
    129                 animations += (((int)(mAnimationScales[1]+.5f)) & 0x7) * 10;
    130             }
    131         }
    132         int idx = 0;
    133         int best = 0;
    134         CharSequence[] aents = mAnimations.getEntryValues();
    135         for (int i=0; i<aents.length; i++) {
    136             int val = Integer.parseInt(aents[i].toString());
    137             if (val <= animations && val > best) {
    138                 best = val;
    139                 idx = i;
    140             }
    141         }
    142         mAnimations.setValueIndex(idx);
    143         updateAnimationsSummary(mAnimations.getValue());
    144         mAccelerometer.setChecked(Settings.System.getInt(
    145                 getContentResolver(),
    146                 Settings.System.ACCELEROMETER_ROTATION, 0) != 0);
    147     }
    148 
    149     private void updateAnimationsSummary(Object value) {
    150         CharSequence[] summaries = getResources().getTextArray(R.array.animations_summaries);
    151         CharSequence[] values = mAnimations.getEntryValues();
    152         for (int i=0; i<values.length; i++) {
    153             //Log.i("foo", "Comparing entry "+ values[i] + " to current "
    154             //        + mAnimations.getValue());
    155             if (values[i].equals(value)) {
    156                 mAnimations.setSummary(summaries[i]);
    157                 break;
    158             }
    159         }
    160     }
    161 
    162     @Override
    163     public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
    164         if (preference == mAccelerometer) {
    165             Settings.System.putInt(getContentResolver(),
    166                     Settings.System.ACCELEROMETER_ROTATION,
    167                     mAccelerometer.isChecked() ? 1 : 0);
    168         }
    169         return true;
    170     }
    171 
    172     public boolean onPreferenceChange(Preference preference, Object objValue) {
    173         final String key = preference.getKey();
    174         if (KEY_ANIMATIONS.equals(key)) {
    175             try {
    176                 int value = Integer.parseInt((String) objValue);
    177                 if (mAnimationScales.length >= 1) {
    178                     mAnimationScales[0] = value%10;
    179                 }
    180                 if (mAnimationScales.length >= 2) {
    181                     mAnimationScales[1] = (value/10)%10;
    182                 }
    183                 try {
    184                     mWindowManager.setAnimationScales(mAnimationScales);
    185                 } catch (RemoteException e) {
    186                 }
    187                 updateAnimationsSummary(objValue);
    188             } catch (NumberFormatException e) {
    189                 Log.e(TAG, "could not persist animation setting", e);
    190             }
    191 
    192         }
    193         if (KEY_SCREEN_TIMEOUT.equals(key)) {
    194             int value = Integer.parseInt((String) objValue);
    195             try {
    196                 Settings.System.putInt(getContentResolver(),
    197                         SCREEN_OFF_TIMEOUT, value);
    198             } catch (NumberFormatException e) {
    199                 Log.e(TAG, "could not persist screen timeout setting", e);
    200             }
    201         }
    202 
    203         return true;
    204     }
    205 }
    206