Fix NPE in PowerManagerService on boot, if some settings are corrupted.

import android.content.BroadcastReceiver;

import android.content.ContentQueryMap;

import android.content.ContentResolver;

import android.content.ContentValues;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.hardware.SensorEvent;

import android.hardware.SensorEventListener;

import android.hardware.SensorManager;

import android.os.BatteryManager;

import android.os.BatteryStats;

import android.os.Binder;

import android.os.Environment;

    // Cached secure settings; see updateSettingsValues()

    private int mShortKeylightDelay = SHORT_KEYLIGHT_DELAY_DEFAULT;

    // Default timeout for screen off, if not found in settings database = 15 seconds.

    private static final int DEFAULT_SCREEN_OFF_TIMEOUT = 15000;

    // flags for setPowerState

    private static final int SCREEN_ON_BIT          = 0x00000001;

    private static final int SCREEN_BRIGHT_BIT      = 0x00000002;

    }

    private class SettingsObserver implements Observer {

        private int getInt(String name) {

            return mSettings.getValues(name).getAsInteger(Settings.System.VALUE);

        private int getInt(String name, int defValue) {

            ContentValues values = mSettings.getValues(name);

            Integer iVal = values != null ? values.getAsInteger(Settings.System.VALUE) : null;

            return iVal != null ? iVal : defValue;

        }

        public void update(Observable o, Object arg) {

            synchronized (mLocks) {

                // STAY_ON_WHILE_PLUGGED_IN

                mStayOnConditions = getInt(STAY_ON_WHILE_PLUGGED_IN);

                // STAY_ON_WHILE_PLUGGED_IN, default to when plugged into AC

                mStayOnConditions = getInt(STAY_ON_WHILE_PLUGGED_IN,

                        BatteryManager.BATTERY_PLUGGED_AC);

                updateWakeLockLocked();

                // SCREEN_OFF_TIMEOUT

                mScreenOffTimeoutSetting = getInt(SCREEN_OFF_TIMEOUT);

                // SCREEN_OFF_TIMEOUT, default to 15 seconds

                mScreenOffTimeoutSetting = getInt(SCREEN_OFF_TIMEOUT, DEFAULT_SCREEN_OFF_TIMEOUT);

                 // DIM_SCREEN

                //mDimScreen = getInt(DIM_SCREEN) != 0;

                // SCREEN_BRIGHTNESS_MODE

                setScreenBrightnessMode(getInt(SCREEN_BRIGHTNESS_MODE));

                // SCREEN_BRIGHTNESS_MODE, default to manual

                setScreenBrightnessMode(getInt(SCREEN_BRIGHTNESS_MODE,

                        Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL));

                // recalculate everything

                setScreenOffTimeoutsLocked();