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TwilightService.javaAPI DocAndroid 5.1 API18673Thu Mar 12 22:22:42 GMT 2015com.android.server.twilight

TwilightService

public final class TwilightService extends com.android.server.SystemService
Figures out whether it's twilight time based on the user's location. Used by the UI mode manager and other components to adjust night mode effects based on sunrise and sunset.

Fields Summary
static final String
TAG
static final boolean
DEBUG
static final String
ACTION_UPDATE_TWILIGHT_STATE
final Object
mLock
android.app.AlarmManager
mAlarmManager
android.location.LocationManager
mLocationManager
LocationHandler
mLocationHandler
final ArrayList
mListeners
TwilightState
mTwilightState
private final TwilightManager
mService
private final android.content.BroadcastReceiver
mUpdateLocationReceiver
private final android.location.LocationListener
mEmptyLocationListener
private final android.location.LocationListener
mLocationListener
Constructors Summary
public TwilightService(android.content.Context context)


       
        super(context);
Methods Summary
private static booleanhasMoved(android.location.Location from, android.location.Location to)

        if (to == null) {
            return false;
        }

        if (from == null) {
            return true;
        }

        // if new location is older than the current one, the device hasn't moved.
        if (to.getElapsedRealtimeNanos() < from.getElapsedRealtimeNanos()) {
            return false;
        }

        // Get the distance between the two points.
        float distance = from.distanceTo(to);

        // Get the total accuracy radius for both locations.
        float totalAccuracy = from.getAccuracy() + to.getAccuracy();

        // If the distance is greater than the combined accuracy of the two
        // points then they can't overlap and hence the user has moved.
        return distance >= totalAccuracy;
public voidonStart()

        mAlarmManager = (AlarmManager) getContext().getSystemService(Context.ALARM_SERVICE);
        mLocationManager = (LocationManager) getContext().getSystemService(
                Context.LOCATION_SERVICE);
        mLocationHandler = new LocationHandler();

        IntentFilter filter = new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED);
        filter.addAction(Intent.ACTION_TIME_CHANGED);
        filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
        filter.addAction(ACTION_UPDATE_TWILIGHT_STATE);
        getContext().registerReceiver(mUpdateLocationReceiver, filter);

        publishLocalService(TwilightManager.class, mService);
private voidsetTwilightState(TwilightState state)


        
        synchronized (mLock) {
            if (!Objects.equal(mTwilightState, state)) {
                if (DEBUG) {
                    Slog.d(TAG, "Twilight state changed: " + state);
                }

                mTwilightState = state;

                final int listenerLen = mListeners.size();
                for (int i = 0; i < listenerLen; i++) {
                    mListeners.get(i).postUpdate();
                }
            }
        }