GeoLocation: add support for GmsCore location provider

device/geolocation/android/java/src/org/chromium/device/geolocation/LocationProviderGmsCore.java

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.device.geolocation;
+
+import android.content.Context;
+import android.location.Location;
+import android.os.Bundle;
+
+import com.google.android.gms.common.ConnectionResult;
+import com.google.android.gms.common.GoogleApiAvailability;
+import com.google.android.gms.common.api.GoogleApiClient;
+import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
+import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
+import com.google.android.gms.location.FusedLocationProviderApi;
+import com.google.android.gms.location.LocationListener;
+import com.google.android.gms.location.LocationRequest;
+import com.google.android.gms.location.LocationServices;
+
+import org.chromium.base.Log;
+import org.chromium.base.ThreadUtils;
+
+/**
+ * This is a LocationProvider using Google Play Services.
+ *
+ * https://developers.google.com/android/reference/com/google/android/gms/location/package-summary
+ */
+public class LocationProviderGmsCore implements ConnectionCallbacks, OnConnectionFailedListener,
+                                                LocationListener,
+                                                LocationProviderFactory.LocationProvider {
+    private static final String TAG = "cr_LocationProvider";
+
+    // Values for the LocationRequest's setInterval for normal and high accuracy, respectively.
+    private static final long UPDATE_INTERVAL_MS = 1000;
+    private static final long UPDATE_INTERVAL_FAST_MS = 500;
+
+    private final GoogleApiClient mGoogleApiClient;
+    private FusedLocationProviderApi mLocationProviderApi = LocationServices.FusedLocationApi;
+
+    private boolean mEnablehighAccuracy;
+    private LocationRequest mLocationRequest;
+
+    public static boolean isGooglePlayServicesAvailable(Context context) {
+        return GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(context)
+                == ConnectionResult.SUCCESS;
+    }
+
+    LocationProviderGmsCore(Context context) {
+        Log.i(TAG, "Google Play Services");
+        mGoogleApiClient = new GoogleApiClient.Builder(context)
+                                   .addApi(LocationServices.API)
+                                   .addConnectionCallbacks(this)
+                                   .addOnConnectionFailedListener(this)
+                                   .build();
+        assert mGoogleApiClient != null;
+    }
+
+    LocationProviderGmsCore(GoogleApiClient client, FusedLocationProviderApi locationApi) {
+        mGoogleApiClient = client;
+        mLocationProviderApi = locationApi;
+    }
+
+    // ConnectionCallbacks implementation
+    @Override
+    public void onConnected(Bundle connectionHint) {
+        ThreadUtils.assertOnUiThread();
+
+        mLocationRequest = LocationRequest.create();
+        if (mEnablehighAccuracy) {
+            mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
+                    .setInterval(UPDATE_INTERVAL_FAST_MS);
+        } else {
+            mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY)
+                    .setInterval(UPDATE_INTERVAL_MS);
+        }
+
+        final Location location = mLocationProviderApi.getLastLocation(mGoogleApiClient);
+        if (location != null) {
+            LocationProviderAdapter.onNewLocationAvailable(location);
+        }
+
+        try {
+            // Request updates on UI Thread replicating LocationProviderAndroid's behaviour.
+            mLocationProviderApi.requestLocationUpdates(
+                    mGoogleApiClient, mLocationRequest, this, ThreadUtils.getUiThreadLooper());
+        } catch (IllegalStateException e) {
+            // Happens "If this method is executed in a thread that has not called Looper.prepare()"
+            Log.e(TAG, "Unexpected exception " + e);
+            assert false;
+        }
+    }
+
+    @Override
+    public void onConnectionSuspended(int cause) {}
+
+    // OnConnectionFailedListener implementation
+    @Override
+    public void onConnectionFailed(ConnectionResult result) {
+        LocationProviderAdapter.newErrorAvailable(
+                "Failed to connect to Google Play Services: " + result.toString());
+    }
+
+    // LocationProviderFactory.LocationProvider implementation
+    @Override
+    public void start(boolean enableHighAccuracy) {
+        ThreadUtils.assertOnUiThread();
+        if (mGoogleApiClient.isConnected()) mGoogleApiClient.disconnect();
+
+        mEnablehighAccuracy = enableHighAccuracy;
+        mGoogleApiClient.connect(); // Should return via onConnected().
+    }
+
+    @Override
+    public void stop() {
+        ThreadUtils.assertOnUiThread();
+        if (!mGoogleApiClient.isConnected()) return;
+
+        mLocationProviderApi.removeLocationUpdates(mGoogleApiClient, this);
+
+        mGoogleApiClient.disconnect();
+    }
+
+    @Override
+    public boolean isRunning() {
+        assert ThreadUtils.runningOnUiThread();
+        if (mGoogleApiClient == null) return false;
+        return mGoogleApiClient.isConnecting() || mGoogleApiClient.isConnected();
+    }
+
+    // LocationListener implementation
+    @Override
+    public void onLocationChanged(Location location) {
+        LocationProviderAdapter.onNewLocationAvailable(location);
+    }
+}