LocationUpdatesFlowableOnSubscribe.java

package com.patloew.rxlocation;

import android.location.Location;
import android.os.Looper;
import android.support.annotation.NonNull;

import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;

import java.util.concurrent.TimeUnit;

import io.reactivex.FlowableEmitter;

/* Copyright 2016 Patrick Löwenstein
 *
 * 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. */
class LocationUpdatesFlowableOnSubscribe extends RxLocationFlowableOnSubscribe<Location> {

    final LocationRequest locationRequest;
    final Looper looper;
    RxLocationListener locationListener;

    protected LocationUpdatesFlowableOnSubscribe(@NonNull RxLocation rxLocation, LocationRequest locationRequest, Looper looper, Long timeout, TimeUnit timeUnit) {
        super(rxLocation, timeout, timeUnit);
        this.locationRequest = locationRequest;
        this.looper = looper;
    }

    @Override
    protected void onGoogleApiClientReady(GoogleApiClient apiClient, FlowableEmitter<Location> emitter) {
        locationListener = new RxLocationListener(emitter);

        //noinspection MissingPermission
        setupLocationPendingResult(
                LocationServices.FusedLocationApi.requestLocationUpdates(apiClient, locationRequest, locationListener, looper),
                new StatusErrorResultCallBack(emitter)
        );
    }

    @Override
    protected void onUnsubscribed(GoogleApiClient apiClient) {
        LocationServices.FusedLocationApi.removeLocationUpdates(apiClient, locationListener);
        locationListener.onUnsubscribed();
        locationListener = null;
    }

    static class RxLocationListener implements LocationListener {

        private FlowableEmitter<Location> emitter;

        RxLocationListener(FlowableEmitter<Location> emitter) {
            this.emitter = emitter;
        }

        void onUnsubscribed() {
            emitter = null;
        }

        @Override
        public void onLocationChanged(Location location) {
            if(emitter != null) { emitter.onNext(location); }
        }
    }
}