Add setting to enable Do Not Disturb during calls

Android N and earlier enabled Do Not Disturb mode while in a call.
Reimplement this behavior to prevent incoming notifications from
vibrating or playing sounds.

Change-Id: Ic38ac775c6e353898190e1571b6d6e521c0e5aa1

3 files changed, 93 insertions, 0 deletions

diff --git a/java/com/android/incallui/AndroidManifest.xml b/java/com/android/incallui/AndroidManifest.xml
index 4cb600190..8e69c0dd9 100644
--- a/java/com/android/incallui/AndroidManifest.xml
+++ b/java/com/android/incallui/AndroidManifest.xml
@@ -46,6 +46,9 @@
   <!-- Set audio selector window type TYPE_APPLICATION_OVERLAY -->
   <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
 
+  <!-- Required when the "Enable Do Not Disturb during call" setting is enabled -->
+  <uses-permission android:name="android.permission.ACCESS_NOTIFICATION_POLICY" />
+
   <!-- Set android:taskAffinity="com.android.incallui" for all activities to ensure proper
   navigation. Otherwise system could bring up MainActivity instead, e.g. when user unmerge a
   call.
diff --git a/java/com/android/incallui/InCallDndHandler.java b/java/com/android/incallui/InCallDndHandler.java
new file mode 100644
index 000000000..4ab3e840a
--- /dev/null
+++ b/java/com/android/incallui/InCallDndHandler.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2018 The LineageOS 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.incallui;
+
+import android.app.NotificationManager;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
+
+import com.android.incallui.call.CallList;
+import com.android.incallui.call.DialerCall;
+import com.android.incallui.call.state.DialerCallState;
+import com.android.incallui.InCallPresenter.InCallState;
+
+public class InCallDndHandler implements InCallPresenter.InCallStateListener {
+
+  private static final String KEY_ENABLE_DND = "incall_enable_dnd";
+
+  private SharedPreferences prefs;
+  private DialerCall activeCall;
+  private NotificationManager notificationManager;
+  private int userSelectedDndMode;
+
+  public InCallDndHandler(Context context) {
+    prefs = PreferenceManager.getDefaultSharedPreferences(context);
+    notificationManager = context.getSystemService(NotificationManager.class);
+
+    // Save the user's Do Not Disturb mode so that it can be restored when the call ends
+    userSelectedDndMode = notificationManager.getCurrentInterruptionFilter();
+  }
+
+  @Override
+  public void onStateChange(InCallState oldState, InCallState newState, CallList callList) {
+    DialerCall activeCall = callList.getActiveCall();
+
+    if (activeCall != null && this.activeCall == null) {
+      Log.d(this, "Transition to active call " + activeCall);
+      handleDndState(activeCall);
+      this.activeCall = activeCall;
+    } else if (activeCall == null && this.activeCall != null) {
+      Log.d(this, "Transition from active call " + this.activeCall);
+      handleDndState(this.activeCall);
+      this.activeCall = null;
+    }
+  }
+
+  private void handleDndState(DialerCall call) {
+    if (!prefs.getBoolean(KEY_ENABLE_DND, false)) {
+      return;
+    }
+    if (DialerCallState.isConnectingOrConnected(call.getState())) {
+      Log.d(this, "Enabling Do Not Disturb mode");
+      setDoNotDisturbMode(NotificationManager.INTERRUPTION_FILTER_NONE);
+    } else {
+      Log.d(this, "Restoring previous Do Not Disturb mode");
+      setDoNotDisturbMode(userSelectedDndMode);
+    }
+  }
+
+  private void setDoNotDisturbMode(int newMode) {
+    if (notificationManager.isNotificationPolicyAccessGranted()) {
+      notificationManager.setInterruptionFilter(newMode);
+    } else {
+      Log.e(this, "Failed to set Do Not Disturb mode " + newMode + " due to lack of permissions");
+    }
+  }
+}
diff --git a/java/com/android/incallui/InCallPresenter.java b/java/com/android/incallui/InCallPresenter.java
index 1bb606ea0..8881029cc 100644
--- a/java/com/android/incallui/InCallPresenter.java
+++ b/java/com/android/incallui/InCallPresenter.java
@@ -128,6 +128,7 @@ public class InCallPresenter implements CallList.Listener, AudioModeProvider.Aud
   private StatusBarNotifier statusBarNotifier;
   private ExternalCallNotifier externalCallNotifier;
   private InCallVibrationHandler vibrationHandler;
+  private InCallDndHandler dndHandler;
   private ContactInfoCache contactInfoCache;
   private Context context;
   private final OnCheckBlockedListener onCheckBlockedListener =
@@ -368,6 +369,9 @@ public class InCallPresenter implements CallList.Listener, AudioModeProvider.Aud
     vibrationHandler = new InCallVibrationHandler(context);
     addListener(vibrationHandler);
 
+    dndHandler = new InCallDndHandler(context);
+    addListener(dndHandler);
+
     this.proximitySensor = proximitySensor;
     addListener(this.proximitySensor);
 
@@ -1662,6 +1666,11 @@ public class InCallPresenter implements CallList.Listener, AudioModeProvider.Aud
       }
       vibrationHandler = null;
 
+      if (dndHandler != null) {
+        removeListener(dndHandler);
+      }
+      dndHandler = null;
+
       if (callList != null) {
         callList.removeListener(this);
         callList.removeListener(spamCallListListener);