Examples with Location android.location.Location used on opensource projects

Example 66 with Location

use of android.location.Location in project android_frameworks_base by ResurrectionRemix.

the class LocationFudger method createCoarseLocked.

/**
     * Create a coarse location.
     *
     * <p>Two techniques are used: random offsets and snap-to-grid.
     *
     * <p>First we add a random offset. This mitigates against detecting
     * grid transitions. Without a random offset it is possible to detect
     * a users position very accurately when they cross a grid boundary.
     * The random offset changes very slowly over time, to mitigate against
     * taking many location samples and averaging them out.
     *
     * <p>Second we snap-to-grid (quantize). This has the nice property of
     * producing stable results, and mitigating against taking many samples
     * to average out a random offset.
     */
private Location createCoarseLocked(Location fine) {
    Location coarse = new Location(fine);
    // clean all the optional information off the location, because
    // this can leak detailed location information
    coarse.removeBearing();
    coarse.removeSpeed();
    coarse.removeAltitude();
    coarse.setExtras(null);
    double lat = coarse.getLatitude();
    double lon = coarse.getLongitude();
    // wrap
    lat = wrapLatitude(lat);
    lon = wrapLongitude(lon);
    // Step 1) apply a random offset
    //
    // The goal of the random offset is to prevent the application
    // from determining that the device is on a grid boundary
    // when it crosses from one grid to the next.
    //
    // We apply the offset even if the location already claims to be
    // inaccurate, because it may be more accurate than claimed.
    updateRandomOffsetLocked();
    // perform lon first whilst lat is still within bounds
    lon += metersToDegreesLongitude(mOffsetLongitudeMeters, lat);
    lat += metersToDegreesLatitude(mOffsetLatitudeMeters);
    if (D)
        Log.d(TAG, String.format("applied offset of %.0f, %.0f (meters)", mOffsetLongitudeMeters, mOffsetLatitudeMeters));
    // wrap
    lat = wrapLatitude(lat);
    lon = wrapLongitude(lon);
    // Step 2) Snap-to-grid (quantize)
    //
    // This is the primary means of obfuscation. It gives nice consistent
    // results and is very effective at hiding the true location
    // (as long as you are not sitting on a grid boundary, which
    // step 1 mitigates).
    //
    // Note we quantize the latitude first, since the longitude
    // quantization depends on the latitude value and so leaks information
    // about the latitude
    double latGranularity = metersToDegreesLatitude(mGridSizeInMeters);
    lat = Math.round(lat / latGranularity) * latGranularity;
    double lonGranularity = metersToDegreesLongitude(mGridSizeInMeters, lat);
    lon = Math.round(lon / lonGranularity) * lonGranularity;
    // wrap again
    lat = wrapLatitude(lat);
    lon = wrapLongitude(lon);
    // apply
    coarse.setLatitude(lat);
    coarse.setLongitude(lon);
    coarse.setAccuracy(Math.max(mAccuracyInMeters, coarse.getAccuracy()));
    if (D)
        Log.d(TAG, "fudged " + fine + " to " + coarse);
    return coarse;
}

Example 67 with Location

use of android.location.Location in project android_frameworks_base by ResurrectionRemix.

the class LocationFudger method addCoarseLocationExtraLocked.

private Location addCoarseLocationExtraLocked(Location location) {
    Location coarse = createCoarseLocked(location);
    location.setExtraLocation(Location.EXTRA_COARSE_LOCATION, coarse);
    return coarse;
}

Example 68 with Location

use of android.location.Location in project android_frameworks_base by ResurrectionRemix.

the class LocationBasedCountryDetector method detectCountry.

/**
     * Start detecting the country.
     * <p>
     * Queries the location from all location providers, then starts a thread to query the
     * country from GeoCoder.
     */
@Override
public synchronized Country detectCountry() {
    if (mLocationListeners != null) {
        throw new IllegalStateException();
    }
    // Request the location from all enabled providers.
    List<String> enabledProviders = getEnabledProviders();
    int totalProviders = enabledProviders.size();
    if (totalProviders > 0) {
        mLocationListeners = new ArrayList<LocationListener>(totalProviders);
        for (int i = 0; i < totalProviders; i++) {
            String provider = enabledProviders.get(i);
            if (isAcceptableProvider(provider)) {
                LocationListener listener = new LocationListener() {

                    @Override
                    public void onLocationChanged(Location location) {
                        if (location != null) {
                            LocationBasedCountryDetector.this.stop();
                            queryCountryCode(location);
                        }
                    }

                    @Override
                    public void onProviderDisabled(String provider) {
                    }

                    @Override
                    public void onProviderEnabled(String provider) {
                    }

                    @Override
                    public void onStatusChanged(String provider, int status, Bundle extras) {
                    }
                };
                mLocationListeners.add(listener);
                registerListener(provider, listener);
            }
        }
        mTimer = new Timer();
        mTimer.schedule(new TimerTask() {

            @Override
            public void run() {
                mTimer = null;
                LocationBasedCountryDetector.this.stop();
                // Looks like no provider could provide the location, let's try the last
                // known location.
                queryCountryCode(getLastKnownLocation());
            }
        }, getQueryLocationTimeout());
    } else {
        // There is no provider enabled.
        queryCountryCode(getLastKnownLocation());
    }
    return mDetectedCountry;
}

Example 69 with Location

use of android.location.Location in project android_frameworks_base by ResurrectionRemix.

the class LocationBasedCountryDetector method getLastKnownLocation.

/**
     * @return the last known location from all providers
     */
protected Location getLastKnownLocation() {
    final long bid = Binder.clearCallingIdentity();
    try {
        List<String> providers = mLocationManager.getAllProviders();
        Location bestLocation = null;
        for (String provider : providers) {
            Location lastKnownLocation = mLocationManager.getLastKnownLocation(provider);
            if (lastKnownLocation != null) {
                if (bestLocation == null || bestLocation.getElapsedRealtimeNanos() < lastKnownLocation.getElapsedRealtimeNanos()) {
                    bestLocation = lastKnownLocation;
                }
            }
        }
        return bestLocation;
    } finally {
        Binder.restoreCallingIdentity(bid);
    }
}

Example 70 with Location

use of android.location.Location in project android_frameworks_base by ResurrectionRemix.

the class TwilightService method updateTwilightState.

private void updateTwilightState() {
    // Calculate the twilight state based on the current time and location.
    final long currentTimeMillis = System.currentTimeMillis();
    final Location location = mLastLocation != null ? mLastLocation : mLocationManager.getLastLocation();
    final TwilightState state = calculateTwilightState(location, currentTimeMillis);
    if (DEBUG) {
        Slog.d(TAG, "updateTwilightState: " + state);
    }
    // Notify listeners if the state has changed.
    synchronized (mListeners) {
        if (!Objects.equals(mLastTwilightState, state)) {
            mLastTwilightState = state;
            for (int i = mListeners.size() - 1; i >= 0; --i) {
                final TwilightListener listener = mListeners.keyAt(i);
                final Handler handler = mListeners.valueAt(i);
                handler.post(new Runnable() {

                    @Override
                    public void run() {
                        listener.onTwilightStateChanged(state);
                    }
                });
            }
        }
    }
    // Schedule an alarm to update the state at the next sunrise or sunset.
    if (state != null) {
        final long triggerAtMillis = state.isNight() ? state.sunriseTimeMillis() : state.sunsetTimeMillis();
        mAlarmManager.setExact(AlarmManager.RTC, triggerAtMillis, TAG, this, mHandler);
    }
}