Log when emergency state changes to track location-related AppOps

Bug: 262906568
Test: manual test
Change-Id: If703872633c9a31857260911091590953cbfe387

services/core/java/com/android/server/location/LocationManagerService.java

@@ -296,6 +296,8 @@ public class LocationManagerService extends ILocationManager.Stub implements
                 refreshAppOpsRestrictions(userId);
             }
         });
+        mInjector.getEmergencyHelper().addOnEmergencyStateChangedListener(
+                this::onEmergencyStateChanged);
 
         // set up passive provider first since it will be required for all other location providers,
         // which are loaded later once the system is ready.
@@ -567,6 +569,11 @@ public class LocationManagerService extends ILocationManager.Stub implements
         refreshAppOpsRestrictions(userId);
     }
 
+    private void onEmergencyStateChanged() {
+        boolean isInEmergency = mInjector.getEmergencyHelper().isInEmergency(Long.MIN_VALUE);
+        mInjector.getLocationUsageLogger().logEmergencyStateChanged(isInEmergency);
+    }
+
     private void logLocationEnabledState() {
         boolean locationEnabled = false;
         // Location setting is considered on if it is enabled for any one user

services/core/java/com/android/server/location/injector/EmergencyHelper.java

@@ -16,14 +16,55 @@
 
 package com.android.server.location.injector;
 
+import java.util.concurrent.CopyOnWriteArrayList;
+
 /**
  * Provides helpers for emergency sessions.
  */
 public abstract class EmergencyHelper {
 
+    private final CopyOnWriteArrayList<EmergencyStateChangedListener> mListeners;
+
+    protected EmergencyHelper() {
+        mListeners = new CopyOnWriteArrayList<>();
+    }
+
+    /**
+     * Listener for emergency state changes.
+     */
+    public interface EmergencyStateChangedListener {
+        /**
+         * Called when state changes.
+         */
+        void onStateChanged();
+    }
+
     /**
      * Returns true if the device is in an emergency session, or if an emergency session ended
      * within the given extension time.
      */
     public abstract boolean isInEmergency(long extensionTimeMs);
+
+    /**
+     * Add a listener for changes to the emergency location state.
+     */
+    public void addOnEmergencyStateChangedListener(EmergencyStateChangedListener listener) {
+        mListeners.add(listener);
+    }
+
+    /**
+     * Remove a listener for changes to the emergency location state.
+     */
+    public void removeOnEmergencyStateChangedListener(EmergencyStateChangedListener listener) {
+        mListeners.remove(listener);
+    }
+
+    /**
+     * Notify listeners for emergency state of state change
+     */
+    protected final void dispatchEmergencyStateChanged() {
+        for (EmergencyStateChangedListener listener : mListeners) {
+            listener.onStateChanged();
+        }
+    }
 }

services/core/java/com/android/server/location/injector/Injector.java

@@ -16,13 +16,11 @@
 
 package com.android.server.location.injector;
 
-import com.android.internal.annotations.VisibleForTesting;
 import com.android.server.location.settings.LocationSettings;
 
 /**
  * Injects various location dependencies so that they may be controlled by tests.
  */
-@VisibleForTesting
 public interface Injector {
 
     /** Returns a UserInfoHelper. */

services/core/java/com/android/server/location/injector/LocationUsageLogger.java

@@ -129,6 +129,13 @@ public class LocationUsageLogger {
         FrameworkStatsLog.write(FrameworkStatsLog.LOCATION_ENABLED_STATE_CHANGED, enabled);
     }
 
+    /**
+     * Log emergency location state change event
+     */
+    public synchronized void logEmergencyStateChanged(boolean isInEmergency) {
+        FrameworkStatsLog.write(FrameworkStatsLog.EMERGENCY_STATE_CHANGED, isInEmergency);
+    }
+
     private static int bucketizeProvider(String provider) {
         if (LocationManager.NETWORK_PROVIDER.equals(provider)) {
             return LocationStatsEnums.PROVIDER_NETWORK;

services/core/java/com/android/server/location/injector/SystemEmergencyHelper.java

@@ -27,6 +27,7 @@ import android.telephony.TelephonyCallback;
 import android.telephony.TelephonyManager;
 import android.util.Log;
 
+import com.android.internal.telephony.TelephonyIntents;
 import com.android.server.FgThread;
 
 import java.util.Objects;
@@ -73,12 +74,25 @@ public class SystemEmergencyHelper extends EmergencyHelper {
                     try {
                         mIsInEmergencyCall = mTelephonyManager.isEmergencyNumber(
                                 intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER));
+                        dispatchEmergencyStateChanged();
                     } catch (IllegalStateException e) {
                         Log.w(TAG, "Failed to call TelephonyManager.isEmergencyNumber().", e);
                     }
                 }
             }
         }, new IntentFilter(Intent.ACTION_NEW_OUTGOING_CALL));
+
+        mContext.registerReceiver(new BroadcastReceiver() {
+            @Override
+            public void onReceive(Context context, Intent intent) {
+                if (!TelephonyIntents.ACTION_EMERGENCY_CALLBACK_MODE_CHANGED.equals(
+                        intent.getAction())) {
+                    return;
+                }
+
+                dispatchEmergencyStateChanged();
+            }
+        }, new IntentFilter(TelephonyIntents.ACTION_EMERGENCY_CALLBACK_MODE_CHANGED));
     }
 
     @Override
@@ -108,6 +122,7 @@ public class SystemEmergencyHelper extends EmergencyHelper {
                     if (mIsInEmergencyCall) {
                         mEmergencyCallEndRealtimeMs = SystemClock.elapsedRealtime();
                         mIsInEmergencyCall = false;
+                        dispatchEmergencyStateChanged();
                     }
                 }
             }

services/tests/mockingservicestests/src/com/android/server/location/injector/FakeEmergencyHelper.java

@@ -27,6 +27,7 @@ public class FakeEmergencyHelper extends EmergencyHelper {
 
     public void setInEmergency(boolean inEmergency) {
         mInEmergency = inEmergency;
+        dispatchEmergencyStateChanged();
     }
 
     @Override