Show footer to notify user no 5G in DSDS mode.

Bug: 151657272
Test: manual and robotests
Change-Id: I5df95528aae12b43a15389b8048f14d9508272f3
diff --git a/res/xml/mobile_network_settings.xml b/res/xml/mobile_network_settings.xml
index 1744513..b49791c 100644
--- a/res/xml/mobile_network_settings.xml
+++ b/res/xml/mobile_network_settings.xml
@@ -241,4 +241,12 @@
         settings:searchable="false"
         settings:controller="com.android.settings.network.telephony.DisableSimFooterPreferenceController"/>
 
+    <com.android.settingslib.widget.FooterPreference
+        android:key="no_5g_in_dsds_explanation"
+        android:title="@string/no_5g_in_dsds_text"
+        android:selectable="false"
+        settings:allowDividerAbove="true"
+        settings:searchable="false"
+        settings:controller="com.android.settings.network.telephony.NrDisabledInDsdsFooterPreferenceController"/>
+
 </PreferenceScreen>
diff --git a/src/com/android/settings/network/telephony/MobileNetworkSettings.java b/src/com/android/settings/network/telephony/MobileNetworkSettings.java
index ae60daf..6ca556a 100644
--- a/src/com/android/settings/network/telephony/MobileNetworkSettings.java
+++ b/src/com/android/settings/network/telephony/MobileNetworkSettings.java
@@ -141,6 +141,7 @@
         use(DeleteSimProfilePreferenceController.class).init(mSubId, this,
                 REQUEST_CODE_DELETE_SUBSCRIPTION);
         use(DisableSimFooterPreferenceController.class).init(mSubId);
+        use(NrDisabledInDsdsFooterPreferenceController.class).init(mSubId);
         use(MobileDataPreferenceController.class).init(getFragmentManager(), mSubId);
         use(RoamingPreferenceController.class).init(getFragmentManager(), mSubId);
         use(ApnPreferenceController.class).init(mSubId);
diff --git a/src/com/android/settings/network/telephony/NrDisabledInDsdsFooterPreferenceController.java b/src/com/android/settings/network/telephony/NrDisabledInDsdsFooterPreferenceController.java
new file mode 100644
index 0000000..e024788
--- /dev/null
+++ b/src/com/android/settings/network/telephony/NrDisabledInDsdsFooterPreferenceController.java
@@ -0,0 +1,67 @@
+/*
+ * 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.settings.network.telephony;
+
+import android.content.Context;
+import android.telephony.SubscriptionManager;
+import android.telephony.TelephonyManager;
+
+import com.android.settings.core.BasePreferenceController;
+
+/**
+ * Class to show the footer that can't connect to 5G when device is in DSDS mode.
+ */
+public class NrDisabledInDsdsFooterPreferenceController extends BasePreferenceController {
+    private int mSubId;
+
+    /**
+     * Constructor.
+     */
+    public NrDisabledInDsdsFooterPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+        mSubId = SubscriptionManager.INVALID_SUBSCRIPTION_ID;
+    }
+
+    /**
+     * Init and specify a subId.
+     */
+    public void init(int subId) {
+        mSubId = subId;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        if (mSubId == SubscriptionManager.INVALID_SUBSCRIPTION_ID) {
+            return CONDITIONALLY_UNAVAILABLE;
+        }
+
+        final TelephonyManager teleManager = ((TelephonyManager)
+                mContext.getSystemService(Context.TELEPHONY_SERVICE))
+                .createForSubscriptionId(mSubId);
+        // Show the footer only when DSDS is enabled, and mobile data is enabled on this SIM, and
+        // 5G is supported on this device.
+        if (!teleManager.isDataEnabled() || teleManager.getActiveModemCount() < 2
+                || !is5GSupportedByRadio(teleManager)) {
+            return CONDITIONALLY_UNAVAILABLE;
+        }
+        return AVAILABLE;
+    }
+
+    private boolean is5GSupportedByRadio(TelephonyManager tm) {
+        return (tm.getSupportedRadioAccessFamily() & TelephonyManager.NETWORK_TYPE_BITMASK_NR) > 0;
+    }
+}
diff --git a/tests/robotests/src/com/android/settings/network/telephony/NrDisabledInDsdsFooterPreferenceControllerTest.java b/tests/robotests/src/com/android/settings/network/telephony/NrDisabledInDsdsFooterPreferenceControllerTest.java
new file mode 100644
index 0000000..c75d874
--- /dev/null
+++ b/tests/robotests/src/com/android/settings/network/telephony/NrDisabledInDsdsFooterPreferenceControllerTest.java
@@ -0,0 +1,100 @@
+/*
+ * 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.settings.network.telephony;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.telephony.TelephonyManager;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+
+@RunWith(RobolectricTestRunner.class)
+public class NrDisabledInDsdsFooterPreferenceControllerTest {
+    private static final String PREF_KEY = "pref_key";
+    private static final int SUB_ID = 111;
+
+    private Context mContext;
+    @Mock
+    private TelephonyManager mTelephonyManager;
+    private NrDisabledInDsdsFooterPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(RuntimeEnvironment.application);
+        doReturn(mTelephonyManager).when(mContext).getSystemService(Context.TELEPHONY_SERVICE);
+        doReturn(mTelephonyManager).when(mTelephonyManager).createForSubscriptionId(anyInt());
+        mController = new NrDisabledInDsdsFooterPreferenceController(mContext, PREF_KEY);
+    }
+
+    @Test
+    public void isAvailable_noInit_notAvailable() {
+        assertThat(mController.isAvailable()).isFalse();
+    }
+
+    @Test
+    public void isAvailable_dataOnAndDsdsAnd5GSupported_Available() {
+        when(mTelephonyManager.getSupportedRadioAccessFamily())
+                .thenReturn(TelephonyManager.NETWORK_TYPE_BITMASK_NR);
+        when(mTelephonyManager.getActiveModemCount()).thenReturn(2);
+        when(mTelephonyManager.isDataEnabled()).thenReturn(true);
+        mController.init(SUB_ID);
+        assertThat(mController.isAvailable()).isTrue();
+    }
+
+    @Test
+    public void isAvailable_5gNotSupported_notAvailable() {
+        when(mTelephonyManager.getSupportedRadioAccessFamily())
+                .thenReturn(TelephonyManager.NETWORK_TYPE_BITMASK_LTE);
+        when(mTelephonyManager.getActiveModemCount()).thenReturn(2);
+        when(mTelephonyManager.isDataEnabled()).thenReturn(true);
+        mController.init(SUB_ID);
+        assertThat(mController.isAvailable()).isFalse();
+    }
+
+    @Test
+    public void isAvailable_mobileDataOff_notAvailable() {
+        when(mTelephonyManager.getSupportedRadioAccessFamily())
+                .thenReturn(TelephonyManager.NETWORK_TYPE_BITMASK_NR);
+        when(mTelephonyManager.getActiveModemCount()).thenReturn(2);
+        when(mTelephonyManager.isDataEnabled()).thenReturn(false);
+        mController.init(SUB_ID);
+        assertThat(mController.isAvailable()).isFalse();
+    }
+
+    @Test
+    public void isAvailable_singleSimMode_notAvailable() {
+        when(mTelephonyManager.getSupportedRadioAccessFamily())
+                .thenReturn(TelephonyManager.NETWORK_TYPE_BITMASK_NR);
+        when(mTelephonyManager.getActiveModemCount()).thenReturn(1);
+        when(mTelephonyManager.isDataEnabled()).thenReturn(true);
+        mController.init(SUB_ID);
+        assertThat(mController.isAvailable()).isFalse();
+    }
+}