Add a "data during calls" preference

This adds a switch which appears on the SIM details page for any SIMs
that aren't the default on for data. It lets the user opt-in to turning
on data on this SIM only in the case where there is an active call -
this is needed because in some cases the default data SIM may not be
able to be used when a call is active on another SIM.

Bug: 132114205
Test: make RunSettingsRoboTests
Change-Id: Ie44c56e0f486fd93aff411a0ba0e47d3695a4941

src/com/android/settings/network/telephony/DataDuringCallsPreferenceController.java

@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2019 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.settings.network.telephony;
+
+import static androidx.lifecycle.Lifecycle.Event.ON_PAUSE;
+import static androidx.lifecycle.Lifecycle.Event.ON_RESUME;
+
+import android.content.Context;
+import android.telephony.SubscriptionManager;
+import android.telephony.TelephonyManager;
+
+import androidx.lifecycle.Lifecycle;
+import androidx.lifecycle.LifecycleObserver;
+import androidx.lifecycle.OnLifecycleEvent;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+import androidx.preference.SwitchPreference;
+
+import com.android.settings.network.SubscriptionsChangeListener;
+
+public class DataDuringCallsPreferenceController extends TelephonyTogglePreferenceController
+        implements LifecycleObserver,
+        SubscriptionsChangeListener.SubscriptionsChangeListenerClient {
+
+    private SwitchPreference mPreference;
+    private SubscriptionsChangeListener mChangeListener;
+    private TelephonyManager mManager;
+
+    public DataDuringCallsPreferenceController(Context context,
+            String preferenceKey) {
+        super(context, preferenceKey);
+        mChangeListener = new SubscriptionsChangeListener(mContext, this);
+    }
+
+    public void init(Lifecycle lifecycle, int subId) {
+        this.mSubId = subId;
+        mManager = mContext.getSystemService(TelephonyManager.class).createForSubscriptionId(subId);
+        lifecycle.addObserver(this);
+    }
+
+    @OnLifecycleEvent(ON_RESUME)
+    public void onResume() {
+        mChangeListener.start();
+    }
+
+    @OnLifecycleEvent(ON_PAUSE)
+    public void onPause() {
+        mChangeListener.stop();
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mPreference = screen.findPreference(getPreferenceKey());
+    }
+
+    @Override
+    public boolean isChecked() {
+        return mManager.isDataAllowedInVoiceCall();
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        mManager.setDataAllowedDuringVoiceCall(isChecked);
+        return true;
+    }
+
+    @Override
+    public int getAvailabilityStatus(int subId) {
+        if (mSubId == SubscriptionManager.INVALID_SUBSCRIPTION_ID ||
+                SubscriptionManager.getDefaultDataSubscriptionId() == mSubId) {
+            return CONDITIONALLY_UNAVAILABLE;
+        }
+        return AVAILABLE;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        super.updateState(preference);
+        preference.setVisible(isAvailable());
+    }
+
+    @Override
+    public void onAirplaneModeChanged(boolean airplaneModeEnabled) {}
+
+    @Override
+    public void onSubscriptionsChanged() {
+        updateState(mPreference);
+    }
+}