/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.hardware.GeomagneticField;
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import android.hardware.Sensor;
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import android.hardware.SensorAdditionalInfo;
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import android.hardware.SensorEvent;
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import android.hardware.SensorEventListener;
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import android.hardware.SensorManager;
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import android.location.Location;
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import android.location.LocationListener;
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import android.location.LocationManager;
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import android.os.Bundle;
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import android.os.SystemClock;
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import android.os.SystemProperties;
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import android.os.UserHandle;
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import android.provider.Settings;
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import android.util.Slog;
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public class SensorNotificationService extends SystemService
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implements SensorEventListener, LocationListener {
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private static final boolean DBG = false;
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private static final String TAG = "SensorNotificationService";
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private static final long MINUTE_IN_MS = 60 * 1000;
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private static final long KM_IN_M = 1000;
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private static final long LOCATION_MIN_TIME = 30 * MINUTE_IN_MS;
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private static final long LOCATION_MIN_DISTANCE = 100 * KM_IN_M;
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private static final String PROPERTY_USE_MOCKED_LOCATION =
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"sensor.notification.use_mocked"; // max key length is 32
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private static final long MILLIS_2010_1_1 = 1262358000000l;
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private Context mContext;
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private SensorManager mSensorManager;
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private LocationManager mLocationManager;
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private Sensor mMetaSensor;
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// for rate limiting
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private long mLocalGeomagneticFieldUpdateTime = -LOCATION_MIN_TIME;
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public SensorNotificationService(Context context) {
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super(context);
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mContext = context;
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}
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public void onStart() {
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LocalServices.addService(SensorNotificationService.class, this);
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}
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public void onBootPhase(int phase) {
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if (phase == PHASE_THIRD_PARTY_APPS_CAN_START) {
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mSensorManager = (SensorManager) mContext.getSystemService(Context.SENSOR_SERVICE);
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mMetaSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_DYNAMIC_SENSOR_META);
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if (mMetaSensor == null) {
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if (DBG) Slog.d(TAG, "Cannot obtain dynamic meta sensor, not supported.");
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} else {
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mSensorManager.registerListener(this, mMetaSensor,
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SensorManager.SENSOR_DELAY_FASTEST);
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}
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}
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if (phase == PHASE_BOOT_COMPLETED) {
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// LocationManagerService is initialized after PHASE_THIRD_PARTY_APPS_CAN_START
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mLocationManager =
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(LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
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if (mLocationManager == null) {
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if (DBG) Slog.d(TAG, "Cannot obtain location service.");
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} else {
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mLocationManager.requestLocationUpdates(
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LocationManager.PASSIVE_PROVIDER,
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LOCATION_MIN_TIME,
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LOCATION_MIN_DISTANCE,
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this);
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}
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}
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}
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private void broadcastDynamicSensorChanged() {
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Intent i = new Intent(Intent.ACTION_DYNAMIC_SENSOR_CHANGED);
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i.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); // avoid waking up manifest receivers
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mContext.sendBroadcastAsUser(i, UserHandle.ALL);
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if (DBG) Slog.d(TAG, "dynamic sensor broadcast sent");
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}
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@Override
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public void onSensorChanged(SensorEvent event) {
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if (event.sensor == mMetaSensor) {
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broadcastDynamicSensorChanged();
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}
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}
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@Override
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public void onLocationChanged(Location location) {
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if (DBG) Slog.d(TAG, String.format(
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"Location is (%f, %f), h %f, acc %f, mocked %b",
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location.getLatitude(), location.getLongitude(),
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location.getAltitude(), location.getAccuracy(),
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location.isFromMockProvider()));
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// lat long == 0 usually means invalid location
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if (location.getLatitude() == 0 && location.getLongitude() == 0) {
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return;
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}
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// update too often, ignore
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if (SystemClock.elapsedRealtime() - mLocalGeomagneticFieldUpdateTime < 10 * MINUTE_IN_MS) {
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return;
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}
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long time = System.currentTimeMillis();
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// Mocked location should not be used. Except in test, only use mocked location
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// Wrong system clock also gives bad values so ignore as well.
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if (useMockedLocation() == location.isFromMockProvider() || time < MILLIS_2010_1_1) {
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return;
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}
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GeomagneticField field = new GeomagneticField(
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(float) location.getLatitude(), (float) location.getLongitude(),
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(float) location.getAltitude(), time);
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if (DBG) Slog.d(TAG, String.format(
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"Nominal mag field, norm %fuT, decline %f deg, incline %f deg",
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field.getFieldStrength() / 1000, field.getDeclination(), field.getInclination()));
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try {
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SensorAdditionalInfo info = SensorAdditionalInfo.createLocalGeomagneticField(
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field.getFieldStrength() / 1000, // convert from nT to uT
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(float)(field.getDeclination() * Math.PI / 180), // from degree to rad
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(float)(field.getInclination() * Math.PI / 180)); // from degree to rad
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if (info != null) {
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mSensorManager.setOperationParameter(info);
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mLocalGeomagneticFieldUpdateTime = SystemClock.elapsedRealtime();
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}
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} catch (IllegalArgumentException e) {
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Slog.e(TAG, "Invalid local geomagnetic field, ignore.");
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}
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}
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@Override
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public void onAccuracyChanged(Sensor sensor, int accuracy) {}
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@Override
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public void onStatusChanged(String provider, int status, Bundle extras) {}
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@Override
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public void onProviderEnabled(String provider) {}
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@Override
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public void onProviderDisabled(String provider) {}
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private boolean useMockedLocation() {
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return "false".equals(System.getProperty(PROPERTY_USE_MOCKED_LOCATION, "false"));
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}
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}
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