| /* |
| * Copyright (C) 2016 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.server; |
| |
| import android.content.Context; |
| import android.content.Intent; |
| import android.hardware.GeomagneticField; |
| import android.hardware.Sensor; |
| import android.hardware.SensorAdditionalInfo; |
| import android.hardware.SensorEvent; |
| import android.hardware.SensorEventListener; |
| import android.hardware.SensorManager; |
| import android.location.Location; |
| import android.location.LocationListener; |
| import android.location.LocationManager; |
| import android.os.Bundle; |
| import android.os.SystemClock; |
| import android.os.UserHandle; |
| import android.util.Slog; |
| |
| public class SensorNotificationService extends SystemService |
| implements SensorEventListener, LocationListener { |
| private static final boolean DBG = false; |
| private static final String TAG = "SensorNotificationService"; |
| |
| private static final long MINUTE_IN_MS = 60 * 1000; |
| private static final long KM_IN_M = 1000; |
| |
| private static final long LOCATION_MIN_TIME = 30 * MINUTE_IN_MS; |
| private static final long LOCATION_MIN_DISTANCE = 100 * KM_IN_M; |
| |
| private static final String PROPERTY_USE_MOCKED_LOCATION = |
| "sensor.notification.use_mocked"; // max key length is 32 |
| |
| private static final long MILLIS_2010_1_1 = 1262358000000l; |
| |
| private static final String ATTRIBUTION_TAG = "SensorNotificationService"; |
| |
| private Context mContext; |
| private SensorManager mSensorManager; |
| private LocationManager mLocationManager; |
| private Sensor mMetaSensor; |
| |
| // for rate limiting |
| private long mLocalGeomagneticFieldUpdateTime = -LOCATION_MIN_TIME; |
| |
| public SensorNotificationService(Context context) { |
| super(context.createAttributionContext(ATTRIBUTION_TAG)); |
| mContext = getContext(); |
| } |
| |
| public void onStart() { |
| LocalServices.addService(SensorNotificationService.class, this); |
| } |
| |
| public void onBootPhase(int phase) { |
| if (phase == PHASE_THIRD_PARTY_APPS_CAN_START) { |
| mSensorManager = (SensorManager) mContext.getSystemService(Context.SENSOR_SERVICE); |
| mMetaSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_DYNAMIC_SENSOR_META); |
| if (mMetaSensor == null) { |
| if (DBG) Slog.d(TAG, "Cannot obtain dynamic meta sensor, not supported."); |
| } else { |
| mSensorManager.registerListener(this, mMetaSensor, |
| SensorManager.SENSOR_DELAY_FASTEST); |
| } |
| } |
| |
| if (phase == PHASE_BOOT_COMPLETED) { |
| // LocationManagerService is initialized after PHASE_THIRD_PARTY_APPS_CAN_START |
| mLocationManager = |
| (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE); |
| if (mLocationManager == null) { |
| if (DBG) Slog.d(TAG, "Cannot obtain location service."); |
| } else { |
| mLocationManager.requestLocationUpdates( |
| LocationManager.PASSIVE_PROVIDER, |
| LOCATION_MIN_TIME, |
| LOCATION_MIN_DISTANCE, |
| this); |
| } |
| } |
| } |
| |
| private void broadcastDynamicSensorChanged() { |
| Intent i = new Intent(Intent.ACTION_DYNAMIC_SENSOR_CHANGED); |
| i.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); // avoid waking up manifest receivers |
| mContext.sendBroadcastAsUser(i, UserHandle.ALL); |
| if (DBG) Slog.d(TAG, "dynamic sensor broadcast sent"); |
| } |
| |
| @Override |
| public void onSensorChanged(SensorEvent event) { |
| if (event.sensor == mMetaSensor) { |
| broadcastDynamicSensorChanged(); |
| } |
| } |
| |
| @Override |
| public void onLocationChanged(Location location) { |
| if (DBG) Slog.d(TAG, String.format( |
| "Location is (%f, %f), h %f, acc %f, mocked %b", |
| location.getLatitude(), location.getLongitude(), |
| location.getAltitude(), location.getAccuracy(), |
| location.isMock())); |
| |
| // lat long == 0 usually means invalid location |
| if (location.getLatitude() == 0 && location.getLongitude() == 0) { |
| return; |
| } |
| |
| // update too often, ignore |
| if (SystemClock.elapsedRealtime() - mLocalGeomagneticFieldUpdateTime < 10 * MINUTE_IN_MS) { |
| return; |
| } |
| |
| long time = System.currentTimeMillis(); |
| // Mocked location should not be used. Except in test, only use mocked location |
| // Wrong system clock also gives bad values so ignore as well. |
| if (useMockedLocation() == location.isMock() || time < MILLIS_2010_1_1) { |
| return; |
| } |
| |
| GeomagneticField field = new GeomagneticField( |
| (float) location.getLatitude(), (float) location.getLongitude(), |
| (float) location.getAltitude(), time); |
| if (DBG) Slog.d(TAG, String.format( |
| "Nominal mag field, norm %fuT, decline %f deg, incline %f deg", |
| field.getFieldStrength() / 1000, field.getDeclination(), field.getInclination())); |
| |
| try { |
| SensorAdditionalInfo info = SensorAdditionalInfo.createLocalGeomagneticField( |
| field.getFieldStrength() / 1000, // convert from nT to uT |
| (float)(field.getDeclination() * Math.PI / 180), // from degree to rad |
| (float)(field.getInclination() * Math.PI / 180)); // from degree to rad |
| if (info != null) { |
| mSensorManager.setOperationParameter(info); |
| mLocalGeomagneticFieldUpdateTime = SystemClock.elapsedRealtime(); |
| } |
| } catch (IllegalArgumentException e) { |
| Slog.e(TAG, "Invalid local geomagnetic field, ignore."); |
| } |
| } |
| |
| @Override |
| public void onAccuracyChanged(Sensor sensor, int accuracy) {} |
| @Override |
| public void onStatusChanged(String provider, int status, Bundle extras) {} |
| @Override |
| public void onProviderEnabled(String provider) {} |
| @Override |
| public void onProviderDisabled(String provider) {} |
| |
| private boolean useMockedLocation() { |
| return "false".equals(System.getProperty(PROPERTY_USE_MOCKED_LOCATION, "false")); |
| } |
| } |
| |