Merge "Fix EmergencyAffordanceService" into rvc-dev

4 files changed, 660 insertions, 192 deletions

diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index 1a9855311518..8f16e530dfe0 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -3496,10 +3496,9 @@
 
     <!-- Do not translate. Mcc codes whose existence trigger the presence of emergency
          affordances-->
-    <integer-array name="config_emergency_mcc_codes" translatable="false">
-        <item>404</item>
-        <item>405</item>
-    </integer-array>
+    <string-array name="config_emergency_iso_country_codes" translatable="false">
+        <item>in</item>
+    </string-array>
 
     <!-- Package name for the device provisioning package. -->
     <string name="config_deviceProvisioningPackage"></string>
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 05c00ce51ee3..ebc3612ca1e6 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -3085,7 +3085,7 @@
   <java-symbol type="string" name="global_action_emergency" />
   <java-symbol type="string" name="config_emergency_call_number" />
   <java-symbol type="string" name="config_emergency_dialer_package" />
-  <java-symbol type="array" name="config_emergency_mcc_codes" />
+  <java-symbol type="array" name="config_emergency_iso_country_codes" />
 
   <java-symbol type="string" name="config_dozeDoubleTapSensorType" />
   <java-symbol type="string" name="config_dozeTapSensorType" />
diff --git a/services/core/java/com/android/server/emergency/EmergencyAffordanceService.java b/services/core/java/com/android/server/emergency/EmergencyAffordanceService.java
index 1cf27ffd1903..cc7915cc3534 100644
--- a/services/core/java/com/android/server/emergency/EmergencyAffordanceService.java
+++ b/services/core/java/com/android/server/emergency/EmergencyAffordanceService.java
@@ -20,90 +20,80 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.os.Binder;
+import android.os.Build;
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Looper;
 import android.os.Message;
 import android.provider.Settings;
-import android.telephony.CellInfo;
-import android.telephony.CellInfoGsm;
-import android.telephony.CellInfoLte;
-import android.telephony.CellInfoWcdma;
-import android.telephony.CellLocation;
-import android.telephony.PhoneStateListener;
 import android.telephony.SubscriptionInfo;
 import android.telephony.SubscriptionManager;
 import android.telephony.TelephonyManager;
+import android.text.TextUtils;
+import android.util.Slog;
 
+import com.android.internal.util.DumpUtils;
+import com.android.internal.util.IndentingPrintWriter;
 import com.android.server.SystemService;
 
+import java.io.FileDescriptor;
+import java.io.PrintWriter;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 
 /**
- * A service that listens to connectivity and SIM card changes and determines if the emergency mode
- * should be enabled
+ * A service that listens to connectivity and SIM card changes and determines if the emergency
+ * affordance should be enabled.
  */
 public class EmergencyAffordanceService extends SystemService {
 
     private static final String TAG = "EmergencyAffordanceService";
+    private static final boolean DBG = false;
 
-    private static final int NUM_SCANS_UNTIL_ABORT = 4;
+    private static final String SERVICE_NAME = "emergency_affordance";
 
     private static final int INITIALIZE_STATE = 1;
-    private static final int CELL_INFO_STATE_CHANGED = 2;
-    private static final int SUBSCRIPTION_CHANGED = 3;
-
     /**
-     * Global setting, whether the last scan of the sim cards reveal that a sim was inserted that
-     * requires the emergency affordance. The value is a boolean (1 or 0).
-     * @hide
+     * @param arg1 slot Index
+     * @param arg2 0
+     * @param obj ISO country code
      */
-    private static final String EMERGENCY_SIM_INSERTED_SETTING = "emergency_sim_inserted_before";
-
-    private final Context mContext;
-    private final ArrayList<Integer> mEmergencyCallMccNumbers;
+    private static final int NETWORK_COUNTRY_CHANGED = 2;
+    private static final int SUBSCRIPTION_CHANGED = 3;
+    private static final int UPDATE_AIRPLANE_MODE_STATUS = 4;
 
-    private final Object mLock = new Object();
+    // Global Settings to override emergency affordance country ISO for debugging.
+    // Available only on debug build. The value is a country ISO string in lower case (eg. "us").
+    private static final String EMERGENCY_AFFORDANCE_OVERRIDE_ISO =
+            "emergency_affordance_override_iso";
 
-    private TelephonyManager mTelephonyManager;
+    private final Context mContext;
+    // Country ISOs that require affordance
+    private final ArrayList<String> mEmergencyCallCountryIsos;
     private SubscriptionManager mSubscriptionManager;
-    private boolean mEmergencyAffordanceNeeded;
+    private TelephonyManager mTelephonyManager;
     private MyHandler mHandler;
-    private int mScansCompleted;
-    private PhoneStateListener mPhoneStateListener = new PhoneStateListener() {
-        @Override
-        public void onCellInfoChanged(List<CellInfo> cellInfo) {
-            if (!isEmergencyAffordanceNeeded()) {
-                requestCellScan();
-            }
-        }
+    private boolean mAnySimNeedsEmergencyAffordance;
+    private boolean mAnyNetworkNeedsEmergencyAffordance;
+    private boolean mEmergencyAffordanceNeeded;
+    private boolean mAirplaneModeEnabled;
+    private boolean mVoiceCapable;
 
-        @Override
-        public void onCellLocationChanged(CellLocation location) {
-            if (!isEmergencyAffordanceNeeded()) {
-                requestCellScan();
-            }
-        }
-    };
-    private BroadcastReceiver mAirplaneModeReceiver = new BroadcastReceiver() {
+    private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
-            if (Settings.Global.getInt(context.getContentResolver(),
-                    Settings.Global.AIRPLANE_MODE_ON, 0) == 0) {
-                startScanning();
-                requestCellScan();
+            if (TelephonyManager.ACTION_NETWORK_COUNTRY_CHANGED.equals(intent.getAction())) {
+                String countryCode = intent.getStringExtra(TelephonyManager.EXTRA_NETWORK_COUNTRY);
+                int slotId = intent.getIntExtra(SubscriptionManager.EXTRA_SLOT_INDEX,
+                        SubscriptionManager.INVALID_SIM_SLOT_INDEX);
+                mHandler.obtainMessage(
+                        NETWORK_COUNTRY_CHANGED, slotId, 0, countryCode).sendToTarget();
+            } else if (Intent.ACTION_AIRPLANE_MODE_CHANGED.equals(intent.getAction())) {
+                mHandler.obtainMessage(UPDATE_AIRPLANE_MODE_STATUS).sendToTarget();
             }
         }
     };
-    private boolean mSimNeedsEmergencyAffordance;
-    private boolean mNetworkNeedsEmergencyAffordance;
-    private boolean mVoiceCapable;
-
-    private void requestCellScan() {
-        mHandler.obtainMessage(CELL_INFO_STATE_CHANGED).sendToTarget();
-    }
 
     private SubscriptionManager.OnSubscriptionsChangedListener mSubscriptionChangedListener
             = new SubscriptionManager.OnSubscriptionsChangedListener() {
@@ -116,207 +106,200 @@ public class EmergencyAffordanceService extends SystemService {
     public EmergencyAffordanceService(Context context) {
         super(context);
         mContext = context;
-        int[] numbers = context.getResources().getIntArray(
-                com.android.internal.R.array.config_emergency_mcc_codes);
-        mEmergencyCallMccNumbers = new ArrayList<>(numbers.length);
-        for (int i = 0; i < numbers.length; i++) {
-            mEmergencyCallMccNumbers.add(numbers[i]);
+        String[] isos = context.getResources().getStringArray(
+                com.android.internal.R.array.config_emergency_iso_country_codes);
+        mEmergencyCallCountryIsos = new ArrayList<>(isos.length);
+        for (String iso : isos) {
+            mEmergencyCallCountryIsos.add(iso);
         }
-    }
 
-    private void updateEmergencyAffordanceNeeded() {
-        synchronized (mLock) {
-            mEmergencyAffordanceNeeded = mVoiceCapable && (mSimNeedsEmergencyAffordance ||
-                    mNetworkNeedsEmergencyAffordance);
-            Settings.Global.putInt(mContext.getContentResolver(),
-                    Settings.Global.EMERGENCY_AFFORDANCE_NEEDED,
-                    mEmergencyAffordanceNeeded ? 1 : 0);
-            if (mEmergencyAffordanceNeeded) {
-                stopScanning();
+        if (Build.IS_DEBUGGABLE) {
+            String overrideIso = Settings.Global.getString(
+                    mContext.getContentResolver(), EMERGENCY_AFFORDANCE_OVERRIDE_ISO);
+            if (!TextUtils.isEmpty(overrideIso)) {
+                if (DBG) Slog.d(TAG, "Override ISO to " + overrideIso);
+                mEmergencyCallCountryIsos.clear();
+                mEmergencyCallCountryIsos.add(overrideIso);
             }
         }
     }
 
-    private void stopScanning() {
-        synchronized (mLock) {
-            mTelephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_NONE);
-            mScansCompleted = 0;
-        }
-    }
-
-    private boolean isEmergencyAffordanceNeeded() {
-        synchronized (mLock) {
-            return mEmergencyAffordanceNeeded;
-        }
-    }
-
     @Override
     public void onStart() {
+        if (DBG) Slog.i(TAG, "onStart");
+        publishBinderService(SERVICE_NAME, new BinderService());
     }
 
     @Override
     public void onBootPhase(int phase) {
         if (phase == PHASE_THIRD_PARTY_APPS_CAN_START) {
-            mTelephonyManager = mContext.getSystemService(TelephonyManager.class);
-            mVoiceCapable = mTelephonyManager.isVoiceCapable();
-            if (!mVoiceCapable) {
-                updateEmergencyAffordanceNeeded();
-                return;
-            }
-            mSubscriptionManager = SubscriptionManager.from(mContext);
-            HandlerThread thread = new HandlerThread(TAG);
-            thread.start();
-            mHandler = new MyHandler(thread.getLooper());
-            mHandler.obtainMessage(INITIALIZE_STATE).sendToTarget();
-            startScanning();
-            IntentFilter filter = new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED);
-            mContext.registerReceiver(mAirplaneModeReceiver, filter);
-            mSubscriptionManager.addOnSubscriptionsChangedListener(mSubscriptionChangedListener);
+            if (DBG) Slog.i(TAG, "onBootPhase");
+            handleThirdPartyBootPhase();
         }
     }
 
-    private void startScanning() {
-        mTelephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_CELL_INFO
-                | PhoneStateListener.LISTEN_CELL_LOCATION);
-    }
-
     /** Handler to do the heavier work on */
     private class MyHandler extends Handler {
-
         public MyHandler(Looper l) {
             super(l);
         }
 
         @Override
         public void handleMessage(Message msg) {
+            if (DBG) Slog.d(TAG, "handleMessage: " + msg.what);
             switch (msg.what) {
                 case INITIALIZE_STATE:
                     handleInitializeState();
                     break;
-                case CELL_INFO_STATE_CHANGED:
-                    handleUpdateCellInfo();
+                case NETWORK_COUNTRY_CHANGED:
+                    final String countryIso = (String) msg.obj;
+                    final int slotId = msg.arg1;
+                    handleNetworkCountryChanged(countryIso, slotId);
                     break;
                 case SUBSCRIPTION_CHANGED:
                     handleUpdateSimSubscriptionInfo();
                     break;
+                case UPDATE_AIRPLANE_MODE_STATUS:
+                    handleUpdateAirplaneModeStatus();
+                    break;
+                default:
+                    Slog.e(TAG, "Unexpected message received: " + msg.what);
             }
         }
     }
 
     private void handleInitializeState() {
-        if (handleUpdateSimSubscriptionInfo()) {
-            return;
-        }
-        if (handleUpdateCellInfo()) {
+        if (DBG) Slog.d(TAG, "handleInitializeState");
+        handleUpdateAirplaneModeStatus();
+        handleUpdateSimSubscriptionInfo();
+        updateNetworkCountry();
+        updateEmergencyAffordanceNeeded();
+    }
+
+    private void handleThirdPartyBootPhase() {
+        if (DBG) Slog.d(TAG, "handleThirdPartyBootPhase");
+        mTelephonyManager = mContext.getSystemService(TelephonyManager.class);
+        mVoiceCapable = mTelephonyManager.isVoiceCapable();
+        if (!mVoiceCapable) {
+            updateEmergencyAffordanceNeeded();
             return;
         }
-        updateEmergencyAffordanceNeeded();
+
+        HandlerThread thread = new HandlerThread(TAG);
+        thread.start();
+        mHandler = new MyHandler(thread.getLooper());
+
+        mSubscriptionManager = SubscriptionManager.from(mContext);
+        mSubscriptionManager.addOnSubscriptionsChangedListener(mSubscriptionChangedListener);
+
+        IntentFilter filter = new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED);
+        filter.addAction(TelephonyManager.ACTION_NETWORK_COUNTRY_CHANGED);
+        mContext.registerReceiver(mBroadcastReceiver, filter);
+
+        mHandler.obtainMessage(INITIALIZE_STATE).sendToTarget();
+    }
+
+    private void handleUpdateAirplaneModeStatus() {
+        mAirplaneModeEnabled = Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.AIRPLANE_MODE_ON, 0) == 1;
+        if (DBG) Slog.d(TAG, "APM status updated to " + mAirplaneModeEnabled);
     }
 
-    private boolean handleUpdateSimSubscriptionInfo() {
-        boolean neededBefore = simNeededAffordanceBefore();
-        boolean neededNow = neededBefore;
+    private void handleUpdateSimSubscriptionInfo() {
         List<SubscriptionInfo> activeSubscriptionInfoList =
                 mSubscriptionManager.getActiveSubscriptionInfoList();
+        if (DBG) Slog.d(TAG, "handleUpdateSimSubscriptionInfo: " + activeSubscriptionInfoList);
         if (activeSubscriptionInfoList == null) {
-            setSimNeedsEmergencyAffordance(neededNow);
-            return neededNow;
+            return;
         }
+
+        boolean needsAffordance = false;
         for (SubscriptionInfo info : activeSubscriptionInfoList) {
-            int mcc = info.getMcc();
-            if (mccRequiresEmergencyAffordance(mcc)) {
-                neededNow = true;
+            if (isoRequiresEmergencyAffordance(info.getCountryIso())) {
+                needsAffordance = true;
                 break;
-            } else if (mcc != 0 && mcc != Integer.MAX_VALUE){
-                // a Sim with a different mcc code was found
-                neededNow = false;
-            }
-            String simOperator = mTelephonyManager
-                    .createForSubscriptionId(info.getSubscriptionId()).getSimOperator();
-            mcc = 0;
-            if (simOperator != null && simOperator.length() >= 3) {
-                mcc = Integer.parseInt(simOperator.substring(0, 3));
-            }
-            if (mcc != 0) {
-                if (mccRequiresEmergencyAffordance(mcc)) {
-                    neededNow = true;
-                    break;
-                } else {
-                    // a Sim with a different mcc code was found
-                    neededNow = false;
-                }
             }
         }
-        setSimNeedsEmergencyAffordance(neededNow);
-        return neededNow;
+
+        mAnySimNeedsEmergencyAffordance = needsAffordance;
+        updateEmergencyAffordanceNeeded();
     }
 
-    private void setSimNeedsEmergencyAffordance(boolean simNeedsEmergencyAffordance) {
-        if (simNeededAffordanceBefore() != simNeedsEmergencyAffordance) {
-            Settings.Global.putInt(mContext.getContentResolver(),
-                    EMERGENCY_SIM_INSERTED_SETTING,
-                    simNeedsEmergencyAffordance ? 1 : 0);
+    private void handleNetworkCountryChanged(String countryIso, int slotId) {
+        if (DBG) {
+            Slog.d(TAG, "handleNetworkCountryChanged: countryIso=" + countryIso
+                    + ", slotId=" + slotId);
         }
-        if (simNeedsEmergencyAffordance != mSimNeedsEmergencyAffordance) {
-            mSimNeedsEmergencyAffordance = simNeedsEmergencyAffordance;
-            updateEmergencyAffordanceNeeded();
+
+        if (TextUtils.isEmpty(countryIso) && mAirplaneModeEnabled) {
+            Slog.w(TAG, "Ignore empty countryIso report when APM is on.");
+            return;
         }
-    }
 
-    private boolean simNeededAffordanceBefore() {
-        return Settings.Global.getInt(mContext.getContentResolver(),
-                EMERGENCY_SIM_INSERTED_SETTING, 0) != 0;
+        updateNetworkCountry();
+
+        updateEmergencyAffordanceNeeded();
     }
 
-    private boolean handleUpdateCellInfo() {
-        List<CellInfo> cellInfos = mTelephonyManager.getAllCellInfo();
-        if (cellInfos == null) {
-            return false;
-        }
-        boolean stopScanningAfterScan = false;
-        for (CellInfo cellInfo : cellInfos) {
-            int mcc = 0;
-            if (cellInfo instanceof CellInfoGsm) {
-                mcc = ((CellInfoGsm) cellInfo).getCellIdentity().getMcc();
-            } else if (cellInfo instanceof CellInfoLte) {
-                mcc = ((CellInfoLte) cellInfo).getCellIdentity().getMcc();
-            } else if (cellInfo instanceof CellInfoWcdma) {
-                mcc = ((CellInfoWcdma) cellInfo).getCellIdentity().getMcc();
-            }
-            if (mccRequiresEmergencyAffordance(mcc)) {
-                setNetworkNeedsEmergencyAffordance(true);
-                return true;
-            } else if (mcc != 0 && mcc != Integer.MAX_VALUE) {
-                // we found an mcc that isn't in the list, abort
-                stopScanningAfterScan = true;
+    private void updateNetworkCountry() {
+        boolean needsAffordance = false;
+
+        final int activeModems = mTelephonyManager.getActiveModemCount();
+        for (int i = 0; i < activeModems; i++) {
+            String countryIso = mTelephonyManager.getNetworkCountryIso(i);
+            if (DBG) Slog.d(TAG, "UpdateNetworkCountry: slotId=" + i + " countryIso=" + countryIso);
+            if (isoRequiresEmergencyAffordance(countryIso)) {
+                needsAffordance = true;
+                break;
             }
         }
-        if (stopScanningAfterScan) {
-            stopScanning();
-        } else {
-            onCellScanFinishedUnsuccessful();
-        }
-        setNetworkNeedsEmergencyAffordance(false);
-        return false;
+
+        mAnyNetworkNeedsEmergencyAffordance = needsAffordance;
+
+        updateEmergencyAffordanceNeeded();
     }
 
-    private void setNetworkNeedsEmergencyAffordance(boolean needsAffordance) {
-        synchronized (mLock) {
-            mNetworkNeedsEmergencyAffordance = needsAffordance;
-            updateEmergencyAffordanceNeeded();
-        }
+    private boolean isoRequiresEmergencyAffordance(String iso) {
+        return mEmergencyCallCountryIsos.contains(iso);
     }
 
-    private void onCellScanFinishedUnsuccessful() {
-        synchronized (mLock) {
-            mScansCompleted++;
-            if (mScansCompleted >= NUM_SCANS_UNTIL_ABORT) {
-                stopScanning();
-            }
+    private void updateEmergencyAffordanceNeeded() {
+        if (DBG) {
+            Slog.d(TAG, "updateEmergencyAffordanceNeeded: mEmergencyAffordanceNeeded="
+                    + mEmergencyAffordanceNeeded + ", mVoiceCapable=" + mVoiceCapable
+                    + ", mAnySimNeedsEmergencyAffordance=" + mAnySimNeedsEmergencyAffordance
+                    + ", mAnyNetworkNeedsEmergencyAffordance="
+                    + mAnyNetworkNeedsEmergencyAffordance);
+        }
+        boolean lastAffordanceNeeded = mEmergencyAffordanceNeeded;
+
+        mEmergencyAffordanceNeeded = mVoiceCapable
+                && (mAnySimNeedsEmergencyAffordance || mAnyNetworkNeedsEmergencyAffordance);
+
+        if (lastAffordanceNeeded != mEmergencyAffordanceNeeded) {
+            Settings.Global.putInt(mContext.getContentResolver(),
+                    Settings.Global.EMERGENCY_AFFORDANCE_NEEDED,
+                    mEmergencyAffordanceNeeded ? 1 : 0);
         }
     }
 
-    private boolean mccRequiresEmergencyAffordance(int mcc) {
-        return mEmergencyCallMccNumbers.contains(mcc);
+    private void dumpInternal(IndentingPrintWriter ipw) {
+        ipw.println("EmergencyAffordanceService (dumpsys emergency_affordance) state:\n");
+        ipw.println("mEmergencyAffordanceNeeded=" + mEmergencyAffordanceNeeded);
+        ipw.println("mVoiceCapable=" + mVoiceCapable);
+        ipw.println("mAnySimNeedsEmergencyAffordance=" + mAnySimNeedsEmergencyAffordance);
+        ipw.println("mAnyNetworkNeedsEmergencyAffordance=" + mAnyNetworkNeedsEmergencyAffordance);
+        ipw.println("mEmergencyCallCountryIsos=" + String.join(",", mEmergencyCallCountryIsos));
+    }
+
+    private final class BinderService extends Binder {
+        @Override
+        protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
+            if (!DumpUtils.checkDumpPermission(mContext, TAG, pw)) {
+                return;
+            }
+
+            dumpInternal(new IndentingPrintWriter(pw, "  "));
+        }
     }
 }
diff --git a/services/tests/servicestests/src/com/android/server/emergency/EmergencyAffordanceServiceTest.java b/services/tests/servicestests/src/com/android/server/emergency/EmergencyAffordanceServiceTest.java
new file mode 100644
index 000000000000..d438a0eb9411
--- /dev/null
+++ b/services/tests/servicestests/src/com/android/server/emergency/EmergencyAffordanceServiceTest.java
@@ -0,0 +1,486 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+package com.android.server.emergency;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.verify;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.res.Resources;
+import android.os.UserHandle;
+import android.provider.Settings;
+import android.telephony.SubscriptionInfo;
+import android.telephony.SubscriptionManager;
+import android.telephony.SubscriptionManager.OnSubscriptionsChangedListener;
+import android.telephony.TelephonyManager;
+import android.test.mock.MockContentResolver;
+import android.testing.AndroidTestingRunner;
+import android.testing.TestableLooper;
+
+import androidx.test.InstrumentationRegistry;
+
+import com.android.internal.util.test.BroadcastInterceptingContext;
+import com.android.internal.util.test.FakeSettingsProvider;
+import com.android.server.SystemService;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Supplier;
+
+/**
+ * Unit test for EmergencyAffordanceService (EAS for short) which determines when
+ * should we enable Emergency Affordance feature (EA for short).
+ *
+ * Please refer to https://source.android.com/devices/tech/connect/emergency-affordance
+ * to see the details of the feature.
+ */
+@RunWith(AndroidTestingRunner.class)
+@TestableLooper.RunWithLooper
+public class EmergencyAffordanceServiceTest {
+
+    // Default country ISO that should enable EA. Value comes from resource
+    // com.android.internal.R.array.config_emergency_iso_country_codes
+    private static final String EMERGENCY_ISO_CODE = "in";
+    // Randomly picked country ISO that should not enable EA.
+    private static final String NON_EMERGENCY_ISO_CODE = "us";
+
+    // Valid values for Settings.Global.EMERGENCY_AFFORDANCE_NEEDED
+    private static final int OFF = 0; // which means feature disabled
+    private static final int ON  = 1; // which means feature enabled
+
+    private static final int ACTIVE_MODEM_COUNT = 2;
+
+    @Mock private Resources mResources;
+    @Mock private SubscriptionManager mSubscriptionManager;
+    @Mock private TelephonyManager mTelephonyManager;
+
+    private TestContext mServiceContext;
+    private MockContentResolver mContentResolver;
+    private OnSubscriptionsChangedListener mSubscriptionChangedListener;
+    private EmergencyAffordanceService mService;
+
+    // Testable Context that mocks resources, content resolver and system services
+    private class TestContext extends BroadcastInterceptingContext {
+        TestContext(Context base) {
+            super(base);
+        }
+
+        @Override
+        public ContentResolver getContentResolver() {
+            return mContentResolver;
+        }
+
+        @Override
+        public Resources getResources() {
+            return mResources;
+        }
+
+        @Override
+        public Object getSystemService(String name) {
+            switch (name) {
+                case Context.TELEPHONY_SUBSCRIPTION_SERVICE:
+                    return mSubscriptionManager;
+                case Context.TELEPHONY_SERVICE:
+                    return mTelephonyManager;
+                default:
+                    return super.getSystemService(name);
+            }
+        }
+    }
+
+    @Before
+    public void setUp() throws Exception {
+        MockitoAnnotations.initMocks(this);
+
+        doReturn(new String[] { EMERGENCY_ISO_CODE }).when(mResources)
+                .getStringArray(com.android.internal.R.array.config_emergency_iso_country_codes);
+
+        final Context context = InstrumentationRegistry.getContext();
+        mServiceContext = new TestContext(context);
+        mContentResolver = new MockContentResolver(mServiceContext);
+        mContentResolver.addProvider(Settings.AUTHORITY, new FakeSettingsProvider());
+
+        // Initialize feature off, to have constant starting
+        Settings.Global.putInt(mContentResolver, Settings.Global.EMERGENCY_AFFORDANCE_NEEDED, 0);
+        mService = new EmergencyAffordanceService(mServiceContext);
+    }
+
+    /**
+     * Verify if the device is not voice capable, the feature should be disabled.
+     */
+    @Test
+    public void testSettings_shouldBeOff_whenVoiceCapableIsFalse() throws Exception {
+        // Given: the device is not voice capable
+        // When:  setup device and boot service
+        setUpDevice(false /* withVoiceCapable */, true /* withEmergencyIsoInSim */,
+                true /* withEmergencyIsoInCell */);
+
+        // Then: EA setting will should be 0
+        verifyEmergencyAffordanceNeededSettings(OFF);
+    }
+
+    /**
+     * Verify the voice capable device is booted up without EA-enabled cell network, with
+     * no EA-enabled SIM installed, feature should be disabled.
+     */
+    @Test
+    public void testSettings_shouldBeOff_whenWithoutEAEanbledNetworkNorSim() throws Exception {
+        // Given: the device is voice capble, no EA-enable SIM, no EA-enabled Cell
+        setUpDevice(true /* withVoiceCapable */, false /* withEmergencyIsoInSim */,
+                false /* withEmergencyIsoInCell */);
+
+        // Then: EA setting will should be 0
+        verifyEmergencyAffordanceNeededSettings(OFF);
+    }
+
+    /**
+     * Verify the voice capable device is booted up with EA-enabled SIM installed, the
+     * feature should be enabled.
+     */
+    @Test
+    public void testSettings_shouldBeOn_whenBootUpWithEAEanbledSim() throws Exception {
+        // Given: the device is voice capble, with EA-enable SIM, no EA-enabled Cell
+        setUpDevice(true /* withVoiceCapable */, true /* withEmergencyIsoInSim */,
+                false /* withEmergencyIsoInCell */);
+
+        // Then: EA setting will immediately update to 1
+        verifyEmergencyAffordanceNeededSettings(ON);
+    }
+
+    /**
+     * Verify the voice capable device is booted up with EA-enabled Cell network, the
+     * feature should be enabled.
+     */
+    @Test
+    public void testSettings_shouldBeOn_whenBootUpWithEAEanbledCell() throws Exception {
+        // Given: the device is voice capble, with EA-enable SIM, with EA-enabled Cell
+        setUpDevice(true /* withVoiceCapable */, false /* withEmergencyIsoInSim */,
+                true /* withEmergencyIsoInCell */);
+
+        // Then: EA setting will immediately update to 1
+        verifyEmergencyAffordanceNeededSettings(ON);
+    }
+
+    /**
+     * Verify when device boot up with no EA-enabled SIM, but later install one,
+     * feature should be enabled.
+     */
+    @Test
+    public void testSettings_shouldBeOn_whenSubscriptionInfoChangedWithEmergencyIso()
+            throws Exception {
+        // Given: the device is voice capable, boot up with no EA-enabled SIM, no EA-enabled Cell
+        setUpDevice(true /* withVoiceCapable */, false/* withEmergencyIsoInSim */,
+                false /* withEmergencyIsoInCell */);
+
+        // When: Insert EA-enabled SIM and get notified
+        setUpSim(true /* withEmergencyIsoInSim */);
+        mSubscriptionChangedListener.onSubscriptionsChanged();
+
+        // Then: EA Setting will update to 1
+        verifyEmergencyAffordanceNeededSettings(ON);
+    }
+
+    /**
+     * Verify when feature was on, device re-insert with no EA-enabled SIMs,
+     * feature should be disabled.
+     */
+    @Test
+    public void testSettings_shouldBeOff_whenSubscriptionInfoChangedWithoutEmergencyIso()
+            throws Exception {
+        // Given: the device is voice capable, no EA-enabled Cell, with EA-enabled SIM
+        setUpDevice(true /* withVoiceCapable */, true /* withEmergencyIsoInSim */,
+                false /* withEmergencyIsoInCell */);
+
+        // When: All SIMs are replaced with EA-disabled ones.
+        setUpSim(false /* withEmergencyIsoInSim */);
+        mSubscriptionChangedListener.onSubscriptionsChanged();
+
+        // Then: EA Setting will update to 0
+        verifyEmergencyAffordanceNeededSettings(OFF);
+    }
+
+    /**
+     * Verify when device boot up with no EA-enabled Cell, but later move into one,
+     * feature should be enabled.
+     */
+    @Test
+    public void testSettings_shouldBeOn_whenCountryIsoChangedWithEmergencyIso()
+            throws Exception {
+        // Given: the device is voice capable, boot up with no EA-enabled SIM, no EA-enabled Cell
+        setUpDevice(true /* withVoiceCapable */, false/* withEmergencyIsoInSim */,
+                false /* withEmergencyIsoInCell */);
+
+        // When: device locale change to EA-enabled Cell and get notified
+        resetCell(true /* withEmergencyIsoInSim */);
+        sendBroadcastNetworkCountryChanged(EMERGENCY_COUNTRY_ISO);
+
+        // Then: EA Setting will update to 1
+        verifyEmergencyAffordanceNeededSettings(ON);
+    }
+
+    /**
+     * Verify when device boot up with  EA-enabled Cell, but later move out of it,
+     * feature should be enabled.
+     */
+    @Test
+    public void testSettings_shouldBeOff_whenCountryIsoChangedWithoutEmergencyIso()
+            throws Exception {
+        // Given: the device is voice capable, boot up with no EA-enabled SIM, with EA-enabled Cell
+        setUpDevice(true /* withVoiceCapable */, false/* withEmergencyIsoInSim */,
+                true /* withEmergencyIsoInCell */);
+
+        // When: device locale change to no EA-enabled Cell and get notified
+        resetCell(false /* withEmergencyIsoInSim */);
+        sendBroadcastNetworkCountryChanged(NON_EMERGENCY_COUNTRY_ISO);
+
+        // Then: EA Setting will update to 0
+        verifyEmergencyAffordanceNeededSettings(OFF);
+    }
+    /**
+     * Verify if device is not in EA-enabled Mobile Network without EA-enable SIM(s) installed,
+     * when receive SubscriptionInfo change, the feature should not be enabled.
+     */
+    @Test
+    public void testSettings_shouldBeOff_whenNoEmergencyIsoInCellNorSim() throws Exception {
+        // Given: the device is voice capable, no EA-enabled Cell, no EA-enabled SIM
+        setUpDevice(true /* withVoiceCapable */, false /* withEmergencyIsoInSim */,
+                false /* withEmergencyIsoInCell */);
+
+        // When: Subscription changed event received
+        mSubscriptionChangedListener.onSubscriptionsChanged();
+
+        // Then: EA Settings should be 0
+        verifyEmergencyAffordanceNeededSettings(OFF);
+    }
+
+    /**
+     * Verify while feature was on, when device receive empty country iso change, while APM is
+     * enabled, feature status should keep on.
+     */
+    @Test
+    public void testSettings_shouldOn_whenReceiveEmptyISOWithAPMEnabled() throws Exception {
+        // Given: the device is voice capable,  no EA-enabled SIM, with EA-enabled Cell
+        setUpDevice(true /* withVoiceCapable */, false /* withEmergencyIsoInSim */,
+                true /* withEmergencyIsoInCell */);
+
+        // Then: EA Settings will update to 1
+        verifyEmergencyAffordanceNeededSettings(ON);
+
+        // When: Airplane mode is enabled, and we receive EMPTY ISO in locale change
+        setAirplaneMode(true);
+        sendBroadcastNetworkCountryChanged(EMPTY_COUNTRY_ISO);
+
+        // Then: EA Settings will keep to 1
+        verifyEmergencyAffordanceNeededSettings(ON);
+    }
+
+    /**
+     * Verify while feature was on, when device receive empty country iso change, while APM is
+     * disabled, feature should be disabled.
+     */
+    @Test
+    public void testSettings_shouldOff_whenReceiveEmptyISOWithAPMDisabled() throws Exception {
+        // Given: the device is voice capable,  no EA-enabled SIM, with EA-enabled Cell
+        setUpDevice(true /* withVoiceCapable */, false /* withEmergencyIsoInSim */,
+                true /* withEmergencyIsoInCell */);
+
+        // Then: EA Settings will update to 1
+        verifyEmergencyAffordanceNeededSettings(ON);
+
+        // When: Airplane mode is disabled, and we receive valid empty ISO in locale change
+        setUpCell(false /* withEmergencyIsoInCell */);
+        setAirplaneMode(false);
+        sendBroadcastNetworkCountryChanged(EMPTY_COUNTRY_ISO);
+
+        // Then: EA Settings will keep to 0
+        verifyEmergencyAffordanceNeededSettings(OFF);
+    }
+
+    /**
+     * Verify when airplane mode is turn on and off in cell network with EA-enabled ISO,
+     * feature should keep enabled.
+     */
+    @Test
+    public void testSettings_shouldBeOn_whenAirplaneModeOnOffWithEmergencyIsoInCell()
+            throws Exception {
+        // Given: the device is voice capable,  no EA-enabled SIM, with EA-enabled Cell
+        setUpDevice(true /* withVoiceCapable */, false /* withEmergencyIsoInSim */,
+                true /* withEmergencyIsoInCell */);
+
+        // When: Device receive locale change with EA-enabled iso
+        sendBroadcastNetworkCountryChanged(EMERGENCY_COUNTRY_ISO);
+
+        // When: Airplane mode is disabled
+        setAirplaneMode(false);
+
+        // Then: EA Settings will keep with 1
+        verifyEmergencyAffordanceNeededSettings(ON);
+
+        // When: Airplane mode is enabled
+        setAirplaneMode(true);
+
+        // Then: EA Settings is still 1
+        verifyEmergencyAffordanceNeededSettings(ON);
+    }
+
+    /**
+     * Verify when airplane mode is turn on and off with EA-enabled ISO in SIM,
+     * feature should keep enabled.
+     */
+    @Test
+    public void testSettings_shouldBeOn_whenAirplaneModeOnOffWithEmergencyIsoInSim()
+            throws Exception {
+        // Given: the device is voice capable, no EA-enabled Cell Network, with EA-enabled SIM
+        setUpDevice(true /* withVoiceCapable */, true /* withEmergencyIsoInSim */,
+                false /* withEmergencyIsoInCell */);
+
+        // When: Airplane mode is disabled
+        setAirplaneMode(false);
+
+        // Then: EA Settings will keep with 1
+        verifyEmergencyAffordanceNeededSettings(ON);
+
+        // When: Airplane mode is enabled
+        setAirplaneMode(true);
+
+        // Then: EA Settings is still 1
+        verifyEmergencyAffordanceNeededSettings(ON);
+    }
+
+    // EAS reads voice capable during boot up and cache it. To test non voice capable device,
+    // we can not put this in setUp
+    private void setUpDevice(boolean withVoiceCapable, boolean withEmergencyIsoInSim,
+            boolean withEmergencyIsoInCell) throws Exception {
+        setUpVoiceCapable(withVoiceCapable);
+
+        setUpSim(withEmergencyIsoInSim);
+
+        setUpCell(withEmergencyIsoInCell);
+
+        // bypass onStart which is used to publish binder service and need sepolicy policy update
+        // mService.onStart();
+
+        mService.onBootPhase(SystemService.PHASE_THIRD_PARTY_APPS_CAN_START);
+
+        if (!withVoiceCapable) {
+            return;
+        }
+
+        captureSubscriptionChangeListener();
+    }
+
+    private void setUpVoiceCapable(boolean voiceCapable) {
+        doReturn(voiceCapable).when(mTelephonyManager).isVoiceCapable();
+    }
+
+    private static final Supplier<String> EMPTY_COUNTRY_ISO = () -> "";
+    private static final Supplier<String> EMERGENCY_COUNTRY_ISO = () -> EMERGENCY_ISO_CODE;
+    private static final Supplier<String> NON_EMERGENCY_COUNTRY_ISO = () -> NON_EMERGENCY_ISO_CODE;
+    private void sendBroadcastNetworkCountryChanged(Supplier<String> countryIso) {
+        Intent intent = new Intent(TelephonyManager.ACTION_NETWORK_COUNTRY_CHANGED);
+        intent.putExtra(TelephonyManager.EXTRA_NETWORK_COUNTRY, countryIso.get());
+        SubscriptionManager.putPhoneIdAndSubIdExtra(intent, 0);
+        mServiceContext.sendBroadcastAsUser(intent, UserHandle.ALL);
+    }
+
+    private void setUpSim(boolean withEmergencyIsoInSim) {
+        List<SubscriptionInfo> subInfos = getSubscriptionInfoList(withEmergencyIsoInSim);
+        doReturn(subInfos).when(mSubscriptionManager).getActiveSubscriptionInfoList();
+    }
+
+    private void setUpCell(boolean withEmergencyIsoInCell) {
+        doReturn(ACTIVE_MODEM_COUNT).when(mTelephonyManager).getActiveModemCount();
+        doReturn(NON_EMERGENCY_ISO_CODE).when(mTelephonyManager).getNetworkCountryIso(0);
+        doReturn(withEmergencyIsoInCell ? EMERGENCY_ISO_CODE : NON_EMERGENCY_ISO_CODE)
+                .when(mTelephonyManager).getNetworkCountryIso(1);
+    }
+
+    private void resetCell(boolean withEmergencyIsoInCell) {
+        doReturn(withEmergencyIsoInCell ? EMERGENCY_ISO_CODE : NON_EMERGENCY_ISO_CODE)
+                .when(mTelephonyManager).getNetworkCountryIso(1);
+    }
+
+    private void captureSubscriptionChangeListener() {
+        final ArgumentCaptor<OnSubscriptionsChangedListener> subChangedListenerCaptor =
+                ArgumentCaptor.forClass(OnSubscriptionsChangedListener.class);
+        verify(mSubscriptionManager).addOnSubscriptionsChangedListener(
+                subChangedListenerCaptor.capture());
+        mSubscriptionChangedListener = subChangedListenerCaptor.getValue();
+    }
+
+    private void setAirplaneMode(boolean enabled) {
+        // Change the system settings
+        Settings.Global.putInt(mContentResolver, Settings.Global.AIRPLANE_MODE_ON,
+                enabled ? 1 : 0);
+
+        // Post the intent
+        final Intent intent = new Intent(Intent.ACTION_AIRPLANE_MODE_CHANGED);
+        intent.putExtra("state", enabled);
+        mServiceContext.sendBroadcastAsUser(intent, UserHandle.ALL);
+    }
+
+    private List<SubscriptionInfo> getSubscriptionInfoList(boolean withEmergencyIso) {
+        List<SubscriptionInfo> subInfos = new ArrayList<>(2);
+
+        // Test with Multiple SIMs. SIM1 is a non-EA SIM
+        // Only country iso is valuable, all other info are filled with dummy values
+        SubscriptionInfo subInfo = new SubscriptionInfo(1, "890126042XXXXXXXXXXX", 0, "T-mobile",
+                "T-mobile", 0, 255, "12345", 0, null,
+                "310", "226", NON_EMERGENCY_ISO_CODE, false, null, null);
+        subInfos.add(subInfo);
+
+        // SIM2 can configured to be non-EA or EA SIM according parameter withEmergencyIso
+        SubscriptionInfo subInfo2 = new SubscriptionInfo(1, "890126042XXXXXXXXXXX", 0, "Airtel",
+                "Aritel", 0, 255, "12345", 0, null, "310", "226",
+                withEmergencyIso ? EMERGENCY_ISO_CODE : NON_EMERGENCY_ISO_CODE,
+                false, null, null);
+        subInfos.add(subInfo2);
+
+        return subInfos;
+    }
+
+    // EAS has handler thread to perform heavy work, while FakeSettingProvider does not support
+    // ContentObserver. To make sure consistent result, we use a simple sleep & retry to wait for
+    // real work finished before verify result.
+    private static final int TIME_DELAY_BEFORE_VERIFY_IN_MS = 50;
+    private static final int RETRIES_BEFORE_VERIFY = 20;
+    private void verifyEmergencyAffordanceNeededSettings(int expected) throws Exception {
+        try {
+            int ct = 0;
+            int actual = -1;
+            while (ct++ < RETRIES_BEFORE_VERIFY
+                    && (actual = Settings.Global.getInt(mContentResolver,
+                    Settings.Global.EMERGENCY_AFFORDANCE_NEEDED)) != expected) {
+                Thread.sleep(TIME_DELAY_BEFORE_VERIFY_IN_MS);
+            }
+            assertEquals(expected, actual);
+        } catch (Settings.SettingNotFoundException e) {
+            fail("SettingNotFoundException thrown for Settings.Global.EMERGENCY_AFFORDANCE_NEEDED");
+        }
+    }
+}