TwilightService: Ignore (0,0) coordinate location updates

am: cc2801296d

Change-Id: Ic74955ff78956953288de96d261dc1eab8fc6137

services/core/java/com/android/server/twilight/TwilightService.java

@@ -59,17 +59,17 @@ public final class TwilightService extends SystemService
 
     private final Handler mHandler;
 
-    private AlarmManager mAlarmManager;
+    protected AlarmManager mAlarmManager;
     private LocationManager mLocationManager;
 
     private boolean mBootCompleted;
     private boolean mHasListeners;
 
     private BroadcastReceiver mTimeChangedReceiver;
-    private Location mLastLocation;
+    protected Location mLastLocation;
 
     @GuardedBy("mListeners")
-    private TwilightState mLastTwilightState;
+    protected TwilightState mLastTwilightState;
 
     public TwilightService(Context context) {
         super(context);
@@ -247,7 +247,11 @@ public final class TwilightService extends SystemService
 
     @Override
     public void onLocationChanged(Location location) {
-        if (location != null) {
+        // Location providers may erroneously return (0.0, 0.0) when they fail to determine the
+        // device's location. These location updates can be safely ignored since the chance of a
+        // user actually being at these coordinates is quite low.
+        if (location != null
+                && !(location.getLongitude() == 0.0 && location.getLatitude() == 0.0)) {
             Slog.d(TAG, "onLocationChanged:"
                     + " provider=" + location.getProvider()
                     + " accuracy=" + location.getAccuracy()

services/tests/servicestests/src/com/android/server/twilight/TwilightServiceTest.java

@@ -0,0 +1,71 @@
+package com.android.server.twilight;
+
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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.
+ */
+
+import android.app.AlarmManager;
+import android.content.Context;
+import android.location.Location;
+import android.test.AndroidTestCase;
+
+public class TwilightServiceTest extends AndroidTestCase {
+
+    private TwilightService mTwilightService;
+    private Location mInitialLocation;
+
+    @Override
+    protected void setUp() throws Exception {
+        final Context context = getContext();
+        mTwilightService = new TwilightService(context);
+        mTwilightService.mAlarmManager =
+                (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
+
+        mInitialLocation = createMockLocation(10.0, 10.0);
+        mTwilightService.onLocationChanged(mInitialLocation);
+    }
+
+    @Override
+    protected void tearDown() throws Exception {
+        mTwilightService = null;
+        mInitialLocation = null;
+    }
+
+    public void testValidLocation_updatedLocation() {
+        final TwilightState priorState = mTwilightService.mLastTwilightState;
+        final Location validLocation = createMockLocation(35.0, 35.0);
+        mTwilightService.onLocationChanged(validLocation);
+        assertEquals(mTwilightService.mLastLocation, validLocation);
+        assertNotSame(priorState, mTwilightService.mLastTwilightState);
+    }
+
+    public void testInvalidLocation_ignoreLocationUpdate() {
+        final TwilightState priorState = mTwilightService.mLastTwilightState;
+        final Location invalidLocation = createMockLocation(0.0, 0.0);
+        mTwilightService.onLocationChanged(invalidLocation);
+        assertEquals(mTwilightService.mLastLocation, mInitialLocation);
+        assertEquals(priorState, mTwilightService.mLastTwilightState);
+    }
+
+    private Location createMockLocation(double latitude, double longitude) {
+        // There's no empty constructor, so we initialize with a string and quickly reset it.
+        final Location location = new Location("");
+        location.reset();
+        location.setLatitude(latitude);
+        location.setLongitude(longitude);
+        return location;
+    }
+
+}