Add service to keep countdown when ui is backgrounded

This change introduced a few new components to make countdown work in
the background.

- EmergencyActionForegroundService: posts a notification with remaining
  seconds.
  * It also starts/stops sound associated with the notification
- EmergencyActionBroadcastReceiver: handles 2 action
  * calling emergency number and
  * cancelling the count down notification

When UI is closed, it start a foreground service to take over the count
down.

Then the service sends an notification immediately, and schedules a
broadcast when countdown reaches 0. This broadcast will trigger
emergency calling.

The notification has a cancel button, which also is a broadcast to
cancel ongoing foreground service.

When foreground service stops, the vibration, sound and notification all
stops with it.

Bug: 172075832
Test: manual
Change-Id: I04f33848b9532534f1551f20320683331207aa7e

3 files changed, 287 insertions, 1 deletions

diff --git a/src/com/android/emergency/action/EmergencyActionFragment.java b/src/com/android/emergency/action/EmergencyActionFragment.java
index f0b36d4e..e8ea31d8 100644
--- a/src/com/android/emergency/action/EmergencyActionFragment.java
+++ b/src/com/android/emergency/action/EmergencyActionFragment.java
@@ -42,6 +42,7 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 import com.android.emergency.R;
+import com.android.emergency.action.service.EmergencyActionForegroundService;
 import com.android.emergency.widgets.countdown.CountDownAnimationView;
 import com.android.emergency.widgets.slider.OnSlideCompleteListener;
 import com.android.emergency.widgets.slider.SliderView;
@@ -68,6 +69,7 @@ public class EmergencyActionFragment extends Fragment implements OnSlideComplete
     @Override
     public void onAttach(Context context) {
         super.onAttach(context);
+        EmergencyActionForegroundService.stopService(context);
         mAudioManager = context.getSystemService(AudioManager.class);
         mEmergencyNumberUtils = new EmergencyNumberUtils(context);
         mTelecomManager = context.getSystemService(TelecomManager.class);
@@ -134,13 +136,18 @@ public class EmergencyActionFragment extends Fragment implements OnSlideComplete
             Log.d(TAG,
                     "Emergency countdown UI dismissed without being cancelled/finished, "
                             + "continuing countdown in background");
-            // TODO(b/172075832): Continue countdown in a foreground service.
+
+            Context context = getContext();
+            context.startService(
+                    EmergencyActionForegroundService.newStartCountdownIntent(context,
+                            mCountDownMillisLeft));
         }
     }
 
     @Override
     public void onSlideComplete() {
         mCountdownCancelled = true;
+        EmergencyActionForegroundService.stopService(getActivity());
         getActivity().finish();
     }
 
diff --git a/src/com/android/emergency/action/broadcast/EmergencyActionBroadcastReceiver.java b/src/com/android/emergency/action/broadcast/EmergencyActionBroadcastReceiver.java
new file mode 100644
index 00000000..6c1c1b27
--- /dev/null
+++ b/src/com/android/emergency/action/broadcast/EmergencyActionBroadcastReceiver.java
@@ -0,0 +1,95 @@
+/*
+ * 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.emergency.action.broadcast;
+
+import static android.telecom.TelecomManager.EXTRA_CALL_SOURCE;
+
+import android.app.AlarmManager;
+import android.app.PendingIntent;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.net.Uri;
+import android.os.Bundle;
+import android.telecom.PhoneAccount;
+import android.telecom.TelecomManager;
+import android.util.Log;
+
+import com.android.emergency.action.service.EmergencyActionForegroundService;
+import com.android.settingslib.emergencynumber.EmergencyNumberUtils;
+
+/**
+ * Broadcast receiver to handle actions for emergency gesture foreground service and notification
+ */
+public class EmergencyActionBroadcastReceiver extends BroadcastReceiver {
+    private static final String TAG = "EmergencyActionRcvr";
+
+
+    private static final String ACTION_START_EMERGENCY_CALL =
+            "com.android.emergency.broadcast.MAKE_EMERGENCY_CALL";
+    private static final String ACTION_CANCEL_COUNTDOWN =
+            "com.android.emergency.broadcast.CANCEL_EMERGENCY_COUNTDOWN";
+
+    public static PendingIntent newCallEmergencyPendingIntent(Context context) {
+        return PendingIntent.getBroadcast(context, 0,
+                new Intent(ACTION_START_EMERGENCY_CALL).setClass(context,
+                        EmergencyActionBroadcastReceiver.class),
+                PendingIntent.FLAG_UPDATE_CURRENT);
+    }
+
+    public static PendingIntent newCancelCountdownPendingIntent(Context context) {
+        return PendingIntent.getBroadcast(context, 0,
+                new Intent(ACTION_CANCEL_COUNTDOWN).setClass(context,
+                        EmergencyActionBroadcastReceiver.class),
+                PendingIntent.FLAG_UPDATE_CURRENT);
+    }
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        AlarmManager alarmManager = context.getSystemService(AlarmManager.class);
+        String action = intent.getAction();
+        switch (action) {
+            case ACTION_START_EMERGENCY_CALL:
+                Log.i(TAG, "Starting to call emergency number");
+                placeEmergencyCall(context);
+                // Intentionally fall through to cancel service
+            case ACTION_CANCEL_COUNTDOWN:
+                Log.i(TAG, "Cancelling scheduled emergency calls and foreground service");
+                alarmManager.cancel(newCallEmergencyPendingIntent(context));
+                EmergencyActionForegroundService.stopService(context);
+                break;
+            default:
+                Log.w(TAG, "Unknown action received, skipping: " + action);
+        }
+    }
+
+    private void placeEmergencyCall(Context context) {
+        if (!context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_TELEPHONY)) {
+            Log.i(TAG, "Telephony is not supported, skipping.");
+            return;
+        }
+        Bundle extras = new Bundle();
+        extras.putBoolean(TelecomManager.EXTRA_IS_USER_INTENT_EMERGENCY_CALL, true);
+        extras.putInt(EXTRA_CALL_SOURCE, TelecomManager.CALL_SOURCE_EMERGENCY_SHORTCUT);
+        TelecomManager telecomManager = context.getSystemService(TelecomManager.class);
+        EmergencyNumberUtils emergencyNumberUtils = new EmergencyNumberUtils(context);
+        telecomManager.placeCall(
+                Uri.fromParts(PhoneAccount.SCHEME_TEL, emergencyNumberUtils.getPoliceNumber(),
+                        /* fragment= */ null), extras);
+    }
+}
diff --git a/src/com/android/emergency/action/service/EmergencyActionForegroundService.java b/src/com/android/emergency/action/service/EmergencyActionForegroundService.java
new file mode 100644
index 00000000..dac8550e
--- /dev/null
+++ b/src/com/android/emergency/action/service/EmergencyActionForegroundService.java
@@ -0,0 +1,184 @@
+/*
+ * 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.emergency.action.service;
+
+import static android.app.NotificationManager.IMPORTANCE_HIGH;
+
+import android.app.AlarmManager;
+import android.app.Notification;
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.app.Service;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.os.IBinder;
+import android.os.SystemClock;
+import android.os.VibrationEffect;
+import android.os.Vibrator;
+import android.telecom.TelecomManager;
+import android.util.Log;
+import android.widget.RemoteViews;
+
+import com.android.emergency.R;
+import com.android.emergency.action.broadcast.EmergencyActionBroadcastReceiver;
+import com.android.settingslib.emergencynumber.EmergencyNumberUtils;
+
+/**
+ * A service that counts down for emergency gesture.
+ */
+public class EmergencyActionForegroundService extends Service {
+    private static final String TAG = "EmergencyActionSvc";
+    /** The notification that current service should be started with. */
+    private static final String SERVICE_EXTRA_NOTIFICATION = "service.extra.notification";
+    /** The remaining time in milliseconds before taking emergency action */
+    private static final String SERVICE_EXTRA_REMAINING_TIME_MS = "service.extra.remaining_time_ms";
+    /** Random unique number for the notification */
+    private static final int COUNT_DOWN_NOTIFICATION_ID = 0x112;
+
+    private TelecomManager mTelecomManager;
+    private Vibrator mVibrator;
+    private EmergencyNumberUtils mEmergencyNumberUtils;
+    private NotificationManager mNotificationManager;
+
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        PackageManager pm = getPackageManager();
+        mVibrator = getSystemService(Vibrator.class);
+        if (pm.hasSystemFeature(PackageManager.FEATURE_TELEPHONY)) {
+            mTelecomManager = getSystemService(TelecomManager.class);
+            mEmergencyNumberUtils = new EmergencyNumberUtils(this);
+        }
+        mNotificationManager = getSystemService(NotificationManager.class);
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        Log.d(TAG, "Service started");
+        if (mTelecomManager == null || mEmergencyNumberUtils == null) {
+            Log.d(TAG, "Device does not have telephony support, nothing to do");
+            stopSelf();
+            return START_NOT_STICKY;
+        }
+        long remainingTimeMs = intent.getLongExtra(SERVICE_EXTRA_REMAINING_TIME_MS, -1);
+        if (remainingTimeMs <= 0) {
+            Log.d(TAG, "Invalid remaining countdown time, nothing to do");
+            stopSelf();
+            return START_NOT_STICKY;
+        }
+        mNotificationManager.createNotificationChannel(buildNotificationChannel(this));
+        Notification notification = intent.getParcelableExtra(SERVICE_EXTRA_NOTIFICATION);
+
+        // Immediately show notification And now put the service in foreground mode
+        startForeground(COUNT_DOWN_NOTIFICATION_ID, notification);
+        scheduleEmergencyCallBroadcast(remainingTimeMs);
+        // vibration
+        // TODO(b/175401642): Use correct vibrate pattern
+        mVibrator.vibrate(
+                VibrationEffect.get(VibrationEffect.EFFECT_HEAVY_CLICK));
+        // TODO(b/172075832): sound
+
+        return START_NOT_STICKY;
+    }
+
+    @Override
+    public void onDestroy() {
+        // Take notification down
+        mNotificationManager.cancel(COUNT_DOWN_NOTIFICATION_ID);
+        // TODO(b/172075832): Stop sound
+        // Stop vibrate
+        mVibrator.cancel();
+        super.onDestroy();
+    }
+
+    @Override
+    public IBinder onBind(Intent intent) {
+        return null;
+    }
+
+    /**
+     * Build {@link Intent} that launches foreground service for emergency gesture's countdown
+     * action
+     */
+    public static Intent newStartCountdownIntent(
+            Context context, long remainingTimeMs) {
+        return new Intent(context, EmergencyActionForegroundService.class)
+                .putExtra(SERVICE_EXTRA_REMAINING_TIME_MS, remainingTimeMs)
+                .putExtra(SERVICE_EXTRA_NOTIFICATION,
+                        buildCountDownNotification(context, remainingTimeMs));
+    }
+
+    /** End all work in this service and remove the foreground notification. */
+    public static void stopService(Context context) {
+        context.stopService(new Intent(context, EmergencyActionForegroundService.class));
+    }
+
+    /**
+     * Creates a {@link NotificationChannel} object for emergency action notifications.
+     *
+     * <p/> Note this does not create notification channel in the system.
+     */
+    private static NotificationChannel buildNotificationChannel(Context context) {
+        NotificationChannel channel = new NotificationChannel("EmergencyGesture",
+                context.getString(R.string.emergency_action_title), IMPORTANCE_HIGH);
+        return channel;
+    }
+
+    private static Notification buildCountDownNotification(Context context, long remainingTimeMs) {
+        NotificationChannel channel = buildNotificationChannel(context);
+        EmergencyNumberUtils emergencyNumberUtils = new EmergencyNumberUtils(context);
+        long targetTimeMs = SystemClock.elapsedRealtime() + remainingTimeMs;
+        // TODO(b/172075832): Make UI prettier
+        RemoteViews contentView =
+                new RemoteViews(context.getPackageName(),
+                        R.layout.emergency_action_count_down_notification);
+        contentView.setTextViewText(R.id.notification_text,
+                context.getString(R.string.emergency_action_subtitle,
+                        emergencyNumberUtils.getPoliceNumber()));
+        contentView.setChronometerCountDown(R.id.chronometer, true);
+        contentView.setChronometer(
+                R.id.chronometer,
+                targetTimeMs,
+                /* format= */ null,
+                /* started= */ true);
+        return new Notification.Builder(context, channel.getId())
+                .setSmallIcon(R.drawable.ic_launcher_settings)
+                .setStyle(new Notification.DecoratedCustomViewStyle())
+                .setAutoCancel(false)
+                .setOngoing(true)
+                // This is set to make sure that device doesn't vibrate twice when client
+                // attempts to post currently displayed notification again
+                .setOnlyAlertOnce(true)
+                .setCategory(Notification.CATEGORY_ALARM)
+                .setCustomContentView(contentView)
+                .addAction(new Notification.Action.Builder(null, context.getText(R.string.cancel),
+                        EmergencyActionBroadcastReceiver.newCancelCountdownPendingIntent(
+                                context)).build())
+                .build();
+    }
+
+    private void scheduleEmergencyCallBroadcast(long remainingTimeMs) {
+        long alarmTimeMs = System.currentTimeMillis() + remainingTimeMs;
+        AlarmManager alarmManager = getSystemService(AlarmManager.class);
+        alarmManager.setExactAndAllowWhileIdle(
+                AlarmManager.RTC_WAKEUP, alarmTimeMs,
+                EmergencyActionBroadcastReceiver.newCallEmergencyPendingIntent(this));
+    }
+
+}