/
LocationModule.java
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/
LocationModule.java
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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
package com.facebook.react.modules.location;
import javax.annotation.Nullable;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.LocationProvider;
import android.os.Bundle;
import android.os.Handler;
import com.facebook.react.bridge.Callback;
import com.facebook.react.bridge.Arguments;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.bridge.ReadableMap;
import com.facebook.react.bridge.WritableMap;
import com.facebook.react.common.SystemClock;
import com.facebook.react.modules.core.DeviceEventManagerModule.RCTDeviceEventEmitter;
/**
* Native module that exposes Geolocation to JS.
*/
public class LocationModule extends ReactContextBaseJavaModule {
private @Nullable String mWatchedProvider;
private static final float RCT_DEFAULT_LOCATION_ACCURACY = 100;
private final LocationListener mLocationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
getReactApplicationContext().getJSModule(RCTDeviceEventEmitter.class)
.emit("geolocationDidChange", locationToMap(location));
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
if (status == LocationProvider.OUT_OF_SERVICE) {
emitError("Provider " + provider + " is out of service.");
} else if (status == LocationProvider.TEMPORARILY_UNAVAILABLE) {
emitError("Provider " + provider + " is temporarily unavailable.");
}
}
@Override
public void onProviderEnabled(String provider) { }
@Override
public void onProviderDisabled(String provider) { }
};
public LocationModule(ReactApplicationContext reactContext) {
super(reactContext);
}
@Override
public String getName() {
return "LocationObserver";
}
private static class LocationOptions {
private final long timeout;
private final double maximumAge;
private final boolean highAccuracy;
private final float distanceFilter;
private LocationOptions(long timeout, double maximumAge, boolean highAccuracy, float distanceFilter) {
this.timeout = timeout;
this.maximumAge = maximumAge;
this.highAccuracy = highAccuracy;
this.distanceFilter = distanceFilter;
}
private static LocationOptions fromReactMap(ReadableMap map) {
// precision might be dropped on timeout (double -> int conversion), but that's OK
long timeout =
map.hasKey("timeout") ? (long) map.getDouble("timeout") : Long.MAX_VALUE;
double maximumAge =
map.hasKey("maximumAge") ? map.getDouble("maximumAge") : Double.POSITIVE_INFINITY;
boolean highAccuracy =
map.hasKey("enableHighAccuracy") && map.getBoolean("enableHighAccuracy");
float distanceFilter =
map.hasKey("distanceFilter") ? (float) map.getDouble("distanceFilter") : RCT_DEFAULT_LOCATION_ACCURACY;
return new LocationOptions(timeout, maximumAge, highAccuracy, distanceFilter);
}
}
/**
* Get the current position. This can return almost immediately if the location is cached or
* request an update, which might take a while.
*
* @param options map containing optional arguments: timeout (millis), maximumAge (millis) and
* highAccuracy (boolean)
*/
@ReactMethod
public void getCurrentPosition(
ReadableMap options,
final Callback success,
Callback error) {
LocationOptions locationOptions = LocationOptions.fromReactMap(options);
try {
LocationManager locationManager =
(LocationManager) getReactApplicationContext().getSystemService(Context.LOCATION_SERVICE);
String provider = getValidProvider(locationManager, locationOptions.highAccuracy);
if (provider == null) {
error.invoke("No available location provider.");
return;
}
Location location = locationManager.getLastKnownLocation(provider);
if (location != null &&
SystemClock.currentTimeMillis() - location.getTime() < locationOptions.maximumAge) {
success.invoke(locationToMap(location));
return;
}
new SingleUpdateRequest(locationManager, provider, locationOptions.timeout, success, error)
.invoke();
} catch (SecurityException e) {
throwLocationPermissionMissing(e);
}
}
/**
* Start listening for location updates. These will be emitted via the
* {@link RCTDeviceEventEmitter} as {@code geolocationDidChange} events.
*
* @param options map containing optional arguments: highAccuracy (boolean)
*/
@ReactMethod
public void startObserving(ReadableMap options) {
if (LocationManager.GPS_PROVIDER.equals(mWatchedProvider)) {
return;
}
LocationOptions locationOptions = LocationOptions.fromReactMap(options);
try {
LocationManager locationManager =
(LocationManager) getReactApplicationContext().getSystemService(Context.LOCATION_SERVICE);
String provider = getValidProvider(locationManager, locationOptions.highAccuracy);
if (provider == null) {
emitError("No location provider available.");
return;
}
if (!provider.equals(mWatchedProvider)) {
locationManager.removeUpdates(mLocationListener);
locationManager.requestLocationUpdates(provider, 1000, locationOptions.distanceFilter, mLocationListener);
}
mWatchedProvider = provider;
} catch (SecurityException e) {
throwLocationPermissionMissing(e);
}
}
/**
* Stop listening for location updates.
*
* NB: this is not balanced with {@link #startObserving}: any number of calls to that method will
* be canceled by just one call to this one.
*/
@ReactMethod
public void stopObserving() {
LocationManager locationManager =
(LocationManager) getReactApplicationContext().getSystemService(Context.LOCATION_SERVICE);
locationManager.removeUpdates(mLocationListener);
mWatchedProvider = null;
}
@Nullable
private static String getValidProvider(LocationManager locationManager, boolean highAccuracy) {
String provider =
highAccuracy ? LocationManager.GPS_PROVIDER : LocationManager.NETWORK_PROVIDER;
if (!locationManager.isProviderEnabled(provider)) {
provider = provider.equals(LocationManager.GPS_PROVIDER)
? LocationManager.NETWORK_PROVIDER
: LocationManager.GPS_PROVIDER;
if (!locationManager.isProviderEnabled(provider)) {
return null;
}
}
return provider;
}
private static WritableMap locationToMap(Location location) {
WritableMap map = Arguments.createMap();
WritableMap coords = Arguments.createMap();
coords.putDouble("latitude", location.getLatitude());
coords.putDouble("longitude", location.getLongitude());
coords.putDouble("altitude", location.getAltitude());
coords.putDouble("accuracy", location.getAccuracy());
coords.putDouble("heading", location.getBearing());
coords.putDouble("speed", location.getSpeed());
map.putMap("coords", coords);
map.putDouble("timestamp", location.getTime());
return map;
}
private void emitError(String error) {
getReactApplicationContext().getJSModule(RCTDeviceEventEmitter.class)
.emit("geolocationError", error);
}
/**
* Provides a clearer exception message than the default one.
*/
private static void throwLocationPermissionMissing(SecurityException e) {
throw new SecurityException(
"Looks like the app doesn't have the permission to access location.\n" +
"Add the following line to your app's AndroidManifest.xml:\n" +
"<uses-permission android:name=\"android.permission.ACCESS_FINE_LOCATION\" />", e);
}
private static class SingleUpdateRequest {
private final Callback mSuccess;
private final Callback mError;
private final LocationManager mLocationManager;
private final String mProvider;
private final long mTimeout;
private final Handler mHandler = new Handler();
private final Runnable mTimeoutRunnable = new Runnable() {
@Override
public void run() {
synchronized (SingleUpdateRequest.this) {
if (!mTriggered) {
mError.invoke("Location request timed out");
mLocationManager.removeUpdates(mLocationListener);
mTriggered = true;
}
}
}
};
private final LocationListener mLocationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
synchronized (SingleUpdateRequest.this) {
if (!mTriggered) {
mSuccess.invoke(locationToMap(location));
mHandler.removeCallbacks(mTimeoutRunnable);
mTriggered = true;
}
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
@Override
public void onProviderEnabled(String provider) {}
@Override
public void onProviderDisabled(String provider) {}
};
private boolean mTriggered;
private SingleUpdateRequest(
LocationManager locationManager,
String provider,
long timeout,
Callback success,
Callback error) {
mLocationManager = locationManager;
mProvider = provider;
mTimeout = timeout;
mSuccess = success;
mError = error;
}
public void invoke() {
mLocationManager.requestSingleUpdate(mProvider, mLocationListener, null);
mHandler.postDelayed(mTimeoutRunnable, SystemClock.currentTimeMillis() + mTimeout);
}
}
}