Add activity for mobile network page

1. Extract the Tabhost to activity level, not fragment level. So
each mobile fragment has a constant subscriptionId
2. Use BottomNavigationView instead of TabHost

Bug: 114749736
Test: RunSettingsRoboTests
Change-Id: I43aebf2ec01a945697c6b2302ab750e715e4bfef

tests/robotests/src/com/android/settings/mobilenetwork/MobileSettingsActivityTest.java

@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2018 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.mobilenetwork;
+
+import static com.android.settings.mobilenetwork.MobileSettingsActivity.MOBILE_SETTINGS_TAG;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+
+import android.content.Context;
+import android.telephony.SubscriptionInfo;
+import android.telephony.SubscriptionManager;
+import android.view.Menu;
+import android.view.View;
+
+import com.android.internal.view.menu.ContextMenuBuilder;
+import com.android.settings.R;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
+import com.google.android.material.bottomnavigation.BottomNavigationView;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentTransaction;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+public class MobileSettingsActivityTest {
+
+    private static final int CURRENT_SUB_ID = 3;
+    private static final int PREV_SUB_ID = 1;
+
+    private Context mContext;
+    private MobileSettingsActivity mMobileSettingsActivity;
+    private List<SubscriptionInfo> mSubscriptionInfos;
+    private Fragment mShowFragment;
+    private Fragment mHideFragment;
+
+    @Mock
+    private SubscriptionManager mSubscriptionManager;
+    @Mock
+    private SubscriptionInfo mSubscriptionInfo;
+    @Mock
+    private FragmentManager mFragmentManager;
+    @Mock
+    private FragmentTransaction mFragmentTransaction;
+    @Mock
+    private BottomNavigationView mBottomNavigationView;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(RuntimeEnvironment.application);
+
+        mMobileSettingsActivity = spy(new MobileSettingsActivity());
+        mSubscriptionInfos = new ArrayList<>();
+        mShowFragment = new Fragment();
+        mHideFragment = new Fragment();
+        mMobileSettingsActivity.mSubscriptionInfos = mSubscriptionInfos;
+
+        doReturn(mSubscriptionManager).when(mMobileSettingsActivity).getSystemService(
+                SubscriptionManager.class);
+        doReturn(mBottomNavigationView).when(mMobileSettingsActivity).findViewById(R.id.bottom_nav);
+        doReturn(mFragmentManager).when(mMobileSettingsActivity).getSupportFragmentManager();
+        doReturn(mFragmentTransaction).when(mFragmentManager).beginTransaction();
+        doReturn(mHideFragment).when(mFragmentManager).findFragmentByTag(
+                MOBILE_SETTINGS_TAG + PREV_SUB_ID);
+        doReturn(mShowFragment).when(mFragmentManager).findFragmentByTag(
+                MOBILE_SETTINGS_TAG + CURRENT_SUB_ID);
+    }
+
+    @Test
+    public void updateBottomNavigationView_oneSubscription_shouldBeGone() {
+        mSubscriptionInfos.add(mSubscriptionInfo);
+        doReturn(mSubscriptionInfos).when(mSubscriptionManager).getActiveSubscriptionInfoList();
+
+        mMobileSettingsActivity.updateBottomNavigationView();
+
+        verify(mBottomNavigationView).setVisibility(View.GONE);
+    }
+
+    @Test
+    public void updateBottomNavigationView_twoSubscription_updateMenu() {
+        final Menu menu = new ContextMenuBuilder(mContext);
+        mSubscriptionInfos.add(mSubscriptionInfo);
+        mSubscriptionInfos.add(mSubscriptionInfo);
+        doReturn(mSubscriptionInfos).when(mSubscriptionManager).getActiveSubscriptionInfoList();
+        doReturn(menu).when(mBottomNavigationView).getMenu();
+
+        mMobileSettingsActivity.updateBottomNavigationView();
+
+        assertThat(menu.size()).isEqualTo(2);
+    }
+
+    @Test
+    public void switchFragment_hidePreviousFragment() {
+        mMobileSettingsActivity.mPrevSubscriptionId = PREV_SUB_ID;
+
+        mMobileSettingsActivity.switchFragment(mShowFragment, CURRENT_SUB_ID);
+
+        verify(mFragmentTransaction).hide(mHideFragment);
+    }
+
+    @Test
+    public void switchFragment_fragmentExist_showItWithArguments() {
+        mMobileSettingsActivity.mPrevSubscriptionId = PREV_SUB_ID;
+
+        mMobileSettingsActivity.switchFragment(mShowFragment, CURRENT_SUB_ID);
+
+        assertThat(mShowFragment.getArguments().getInt(
+                MobileSettingsActivity.KEY_SUBSCRIPTION_ID)).isEqualTo(CURRENT_SUB_ID);
+        verify(mFragmentTransaction).show(mShowFragment);
+    }
+}