From b1369818a36feba921a25091c1c18c44ef9b6092 Mon Sep 17 00:00:00 2001
From: Yuncheol Heo <ycheo@google.com>
Date: Thu, 4 Jun 2020 16:06:43 -0700
Subject: [PATCH] Add ReadViewCameraViewController/Mediator.

- Launch config_rearViewCameraActivity in the overlay Window when
  gear is reversed.
- Add/Remove ActivityView dynamically to save the system resource
  while it is hidden.

Bug: 157481389
Test: atest com.android.systemui.car.rvc
Test: Check if RearViewCamera is launched when the gear is reversed and if it will be closed when the gear is changed to the other one.
Change-Id: I768fe9090eed9cb82c4108ab8f6335802d36fa64
---
 packages/CarSystemUI/AndroidManifest.xml      |   2 +
 .../res/layout/rear_view_camera.xml           |  31 ++++
 .../res/layout/sysui_overlay_window.xml       |   8 +-
 packages/CarSystemUI/res/values/colors.xml    |   2 +
 packages/CarSystemUI/res/values/config.xml    |   4 +
 packages/CarSystemUI/res/values/dimens.xml    |   4 +
 packages/CarSystemUI/res/values/strings.xml   |   2 +
 .../car/rvc/RearViewCameraViewController.java | 141 +++++++++++++++
 .../car/rvc/RearViewCameraViewMediator.java   | 121 +++++++++++++
 .../car/window/OverlayWindowModule.java       |   8 +
 .../rvc/RearViewCameraViewControllerTest.java | 117 ++++++++++++
 .../rvc/RearViewCameraViewMediatorTest.java   | 169 ++++++++++++++++++
 12 files changed, 608 insertions(+), 1 deletion(-)
 create mode 100644 packages/CarSystemUI/res/layout/rear_view_camera.xml
 create mode 100644 packages/CarSystemUI/src/com/android/systemui/car/rvc/RearViewCameraViewController.java
 create mode 100644 packages/CarSystemUI/src/com/android/systemui/car/rvc/RearViewCameraViewMediator.java
 create mode 100644 packages/CarSystemUI/tests/src/com/android/systemui/car/rvc/RearViewCameraViewControllerTest.java
 create mode 100644 packages/CarSystemUI/tests/src/com/android/systemui/car/rvc/RearViewCameraViewMediatorTest.java

diff --git a/packages/CarSystemUI/AndroidManifest.xml b/packages/CarSystemUI/AndroidManifest.xml
index c0482e1b3e046..f0cf2a9b71567 100644
--- a/packages/CarSystemUI/AndroidManifest.xml
+++ b/packages/CarSystemUI/AndroidManifest.xml
@@ -23,6 +23,8 @@
     <uses-permission android:name="android.car.permission.CAR_POWER" />
     <!-- This permission is required to get the trusted device list of a user. -->
     <uses-permission android:name="android.car.permission.CAR_ENROLL_TRUST"/>
+    <!-- This permission is required to monitor gear state. -->
+    <uses-permission android:name="android.car.permission.CAR_POWERTRAIN" />
     <!-- This permission is required to get bluetooth broadcast. -->
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <!-- These permissions are required to implement icons based on role holders. -->
diff --git a/packages/CarSystemUI/res/layout/rear_view_camera.xml b/packages/CarSystemUI/res/layout/rear_view_camera.xml
new file mode 100644
index 0000000000000..9b9898cf3f452
--- /dev/null
+++ b/packages/CarSystemUI/res/layout/rear_view_camera.xml
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ 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.
+  -->
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/rear_view_camera_container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@android:color/transparent"
+    android:orientation="vertical">
+    <Button
+        android:id="@+id/close_button"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:background="@color/rear_view_camera_button_background"
+        android:text="@string/rear_view_camera_close_button_text"
+        android:textAppearance="?android:attr/textAppearanceLarge"/>
+</LinearLayout>
diff --git a/packages/CarSystemUI/res/layout/sysui_overlay_window.xml b/packages/CarSystemUI/res/layout/sysui_overlay_window.xml
index 2c9788955bfa4..980265e84e545 100644
--- a/packages/CarSystemUI/res/layout/sysui_overlay_window.xml
+++ b/packages/CarSystemUI/res/layout/sysui_overlay_window.xml
@@ -42,4 +42,10 @@
               android:layout_height="match_parent"
               android:layout="@layout/car_user_switching_dialog"/>
 
-</FrameLayout>
\ No newline at end of file
+    <!-- Should be at bottom to get the highest Z-order. -->
+    <ViewStub android:id="@+id/rear_view_camera_stub"
+              android:layout_width="@dimen/rear_view_camera_width"
+              android:layout_height="@dimen/rear_view_camera_height"
+              android:layout_gravity="center"
+              android:layout="@layout/rear_view_camera"/>
+</FrameLayout>
diff --git a/packages/CarSystemUI/res/values/colors.xml b/packages/CarSystemUI/res/values/colors.xml
index 0181b9a39aea1..91d4166235385 100644
--- a/packages/CarSystemUI/res/values/colors.xml
+++ b/packages/CarSystemUI/res/values/colors.xml
@@ -66,4 +66,6 @@
 
     <color name="car_user_switching_dialog_background_color">@android:color/black</color>
     <color name="car_user_switching_dialog_loading_text_color">@*android:color/car_body1</color>
+
+    <color name="rear_view_camera_button_background">@*android:color/car_card_dark</color>
 </resources>
diff --git a/packages/CarSystemUI/res/values/config.xml b/packages/CarSystemUI/res/values/config.xml
index 949a0fac9598f..8667ba1cd1a55 100644
--- a/packages/CarSystemUI/res/values/config.xml
+++ b/packages/CarSystemUI/res/values/config.xml
@@ -108,6 +108,7 @@
         <item>com.android.systemui.car.keyguard.CarKeyguardViewMediator</item>
         <item>com.android.systemui.car.userswitcher.FullscreenUserSwitcherViewMediator</item>
         <item>com.android.systemui.car.userswitcher.UserSwitchTransitionViewMediator</item>
+        <item>com.android.systemui.car.rvc.RearViewCameraViewMediator</item>
     </string-array>
 
     <!--
@@ -150,4 +151,7 @@
 
     <!-- How many milliseconds to wait before force hiding the UserSwitchTransitionView -->
     <integer name="config_userSwitchTransitionViewShownTimeoutMs" translatable="false">5000</integer>
+
+    <!-- The Activity name for the Rear View Camera, if empty, the feature will be disabled. -->
+    <string name="config_rearViewCameraActivity" translatable="false"></string>
 </resources>
diff --git a/packages/CarSystemUI/res/values/dimens.xml b/packages/CarSystemUI/res/values/dimens.xml
index 86bfa751d0856..a7d8ab5f2a4c8 100644
--- a/packages/CarSystemUI/res/values/dimens.xml
+++ b/packages/CarSystemUI/res/values/dimens.xml
@@ -227,4 +227,8 @@
     <dimen name="car_fullscreen_user_pod_image_avatar_height">96dp</dimen>
     <dimen name="car_user_switching_dialog_loading_text_margin_top">@*android:dimen/car_padding_4</dimen>
     <dimen name="car_user_switching_dialog_loading_text_font_size">@*android:dimen/car_body1_size</dimen>
+
+    <!-- dimensions for rear view camera -->
+    <dimen name="rear_view_camera_width">600dp</dimen>
+    <dimen name="rear_view_camera_height">500dp</dimen>
 </resources>
diff --git a/packages/CarSystemUI/res/values/strings.xml b/packages/CarSystemUI/res/values/strings.xml
index 06ae7cfd6d1bb..264456588c806 100644
--- a/packages/CarSystemUI/res/values/strings.xml
+++ b/packages/CarSystemUI/res/values/strings.xml
@@ -42,4 +42,6 @@
     <string name="car_loading_profile">Loading</string>
     <!-- Message to inform user that the new user profile is loading with additional information on the previous and the next user. [CHAR LIMIT=100] -->
     <string name="car_loading_profile_developer_message">Loading user (from <xliff:g id="from_user" example="10">%1$d</xliff:g> to <xliff:g id="to_user" example="12">%2$d</xliff:g>)</string>
+    <!-- Text for the close button in Rear View Camera [CHAR LIMIT=30] -->
+    <string name="rear_view_camera_close_button_text">Close</string>
 </resources>
diff --git a/packages/CarSystemUI/src/com/android/systemui/car/rvc/RearViewCameraViewController.java b/packages/CarSystemUI/src/com/android/systemui/car/rvc/RearViewCameraViewController.java
new file mode 100644
index 0000000000000..d63463309ec5f
--- /dev/null
+++ b/packages/CarSystemUI/src/com/android/systemui/car/rvc/RearViewCameraViewController.java
@@ -0,0 +1,141 @@
+/*
+ * 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.systemui.car.rvc;
+
+import android.app.ActivityView;
+import android.app.ActivityView.StateCallback;
+import android.content.ComponentName;
+import android.content.Intent;
+import android.content.res.Resources;
+import android.util.Slog;
+import android.view.ViewGroup;
+import android.widget.LinearLayout.LayoutParams;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.systemui.R;
+import com.android.systemui.car.window.OverlayViewController;
+import com.android.systemui.car.window.OverlayViewGlobalStateController;
+import com.android.systemui.dagger.SysUISingleton;
+import com.android.systemui.dagger.qualifiers.Main;
+
+import javax.inject.Inject;
+
+/** View controller for the rear view camera. */
+@SysUISingleton
+public class RearViewCameraViewController extends OverlayViewController {
+    private static final String TAG = "RearViewCameraView";
+    private static final boolean DBG = false;
+
+    private final ComponentName mRearViewCameraActivity;
+    private ViewGroup mRvcView;
+    private final LayoutParams mRvcViewLayoutParams = new LayoutParams(
+            LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, /* weight= */ 1.0f);
+    @VisibleForTesting
+    ActivityView mActivityView;
+    @VisibleForTesting
+    final StateCallback mActivityViewCallback = new StateCallback() {
+        @Override
+        public void onActivityViewReady(ActivityView view) {
+            Intent intent = new Intent(Intent.ACTION_MAIN)
+                    .setComponent(mRearViewCameraActivity)
+                    .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                    .addFlags(Intent.FLAG_ACTIVITY_NEW_DOCUMENT)
+                    .addFlags(Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
+            // TODO(b/170899079): Migrate this to FixedActivityService.
+            view.startActivity(intent);
+        }
+
+        @Override
+        public void onActivityViewDestroyed(ActivityView view) {}
+    };
+
+    @Inject
+    public RearViewCameraViewController(
+            @Main Resources resources,
+            OverlayViewGlobalStateController overlayViewGlobalStateController) {
+        super(R.id.rear_view_camera_stub, overlayViewGlobalStateController);
+        String rearViewCameraActivityName = resources.getString(
+                R.string.config_rearViewCameraActivity);
+        if (!rearViewCameraActivityName.isEmpty()) {
+            mRearViewCameraActivity = ComponentName.unflattenFromString(rearViewCameraActivityName);
+            if (DBG) Slog.d(TAG, "mRearViewCameraActivity=" + mRearViewCameraActivity);
+        } else {
+            mRearViewCameraActivity = null;
+            Slog.e(TAG, "RearViewCameraViewController is disabled, since no Activity is defined");
+        }
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        mRvcView = (ViewGroup) getLayout().findViewById(R.id.rear_view_camera_container);
+        getLayout().findViewById(R.id.close_button).setOnClickListener(v -> {
+            stop();
+        });
+    }
+
+    @Override
+    protected void hideInternal() {
+        super.hideInternal();
+        if (DBG) Slog.d(TAG, "hideInternal: mActivityView=" + mActivityView);
+        if (mActivityView == null) return;
+        mRvcView.removeView(mActivityView);
+        // Release ActivityView since the Activity on ActivityView (with showWhenLocked flag) keeps
+        // running even if ActivityView is hidden.
+        mActivityView.release();
+        mActivityView = null;
+    }
+
+    @Override
+    protected void showInternal() {
+        super.showInternal();
+        if (DBG) Slog.d(TAG, "showInternal: mActivityView=" + mActivityView);
+        if (mActivityView != null) return;
+        mActivityView = new ActivityView(mRvcView.getContext());
+        mActivityView.setCallback(mActivityViewCallback);
+        mActivityView.setLayoutParams(mRvcViewLayoutParams);
+        mRvcView.addView(mActivityView, /* index= */ 0);
+    }
+
+    boolean isShown() {
+        return mActivityView != null;
+    }
+
+    boolean isEnabled() {
+        return mRearViewCameraActivity != null;
+    }
+
+    @Override
+    protected boolean shouldShowHUN() {
+        return false;
+    }
+
+    @Override
+    protected boolean shouldShowWhenOccluded() {
+        // Returns true to show it on top of Keylock.
+        return true;
+    }
+
+    @Override
+    protected boolean shouldShowNavigationBarInsets() {
+        return true;
+    }
+
+    @Override
+    protected boolean shouldShowStatusBarInsets() {
+        return true;
+    }
+}
diff --git a/packages/CarSystemUI/src/com/android/systemui/car/rvc/RearViewCameraViewMediator.java b/packages/CarSystemUI/src/com/android/systemui/car/rvc/RearViewCameraViewMediator.java
new file mode 100644
index 0000000000000..c575c423b2563
--- /dev/null
+++ b/packages/CarSystemUI/src/com/android/systemui/car/rvc/RearViewCameraViewMediator.java
@@ -0,0 +1,121 @@
+/*
+ * 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.systemui.car.rvc;
+
+import android.car.Car;
+import android.car.VehicleGear;
+import android.car.VehiclePropertyIds;
+import android.car.hardware.CarPropertyValue;
+import android.car.hardware.property.CarPropertyManager;
+import android.car.hardware.property.CarPropertyManager.CarPropertyEventCallback;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.os.UserHandle;
+import android.util.Slog;
+
+import com.android.systemui.broadcast.BroadcastDispatcher;
+import com.android.systemui.car.CarServiceProvider;
+import com.android.systemui.car.window.OverlayViewMediator;
+import com.android.systemui.dagger.SysUISingleton;
+
+import javax.inject.Inject;
+
+/**
+ * View mediator for the rear view camera (RVC), which monitors the gear changes and shows
+ * the RVC when the gear position is R and otherwise it hides the RVC.
+ */
+@SysUISingleton
+public class RearViewCameraViewMediator implements OverlayViewMediator {
+    private static final String TAG = "RearViewCameraView";
+    private static final boolean DBG = false;
+
+    private final RearViewCameraViewController mRearViewCameraViewController;
+    private final CarServiceProvider mCarServiceProvider;
+    private final BroadcastDispatcher mBroadcastDispatcher;
+
+    private CarPropertyManager mCarPropertyManager;
+    // TODO(b/170792252): Replace the following with the callback from CarEvsManager if it's ready.
+    private final CarPropertyEventCallback mPropertyEventCallback = new CarPropertyEventCallback() {
+        @Override
+        public void onChangeEvent(CarPropertyValue value) {
+            if (DBG) Slog.d(TAG, "onChangeEvent value=" + value);
+            if (value.getPropertyId() != VehiclePropertyIds.GEAR_SELECTION) {
+                Slog.w(TAG, "Got the event for non-registered property: " + value.getPropertyId());
+                return;
+            }
+            if ((Integer) value.getValue() == VehicleGear.GEAR_REVERSE) {
+                mRearViewCameraViewController.start();
+            } else {
+                mRearViewCameraViewController.stop();
+            }
+        }
+        @Override
+        public void onErrorEvent(int propId, int zone) {
+            Slog.e(TAG, "onErrorEvent propId=" + propId + ", zone=" + zone);
+        }
+    };
+
+    private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            if (DBG) Slog.d(TAG, "onReceive: " + intent);
+            if (Intent.ACTION_CLOSE_SYSTEM_DIALOGS.equals(intent.getAction())
+                    && mRearViewCameraViewController.isShown()) {
+                mRearViewCameraViewController.stop();
+            }
+        }
+    };
+
+    @Inject
+    public RearViewCameraViewMediator(
+            RearViewCameraViewController rearViewCameraViewController,
+            CarServiceProvider carServiceProvider,
+            BroadcastDispatcher broadcastDispatcher) {
+        if (DBG) Slog.d(TAG, "RearViewCameraViewMediator:init");
+        mRearViewCameraViewController = rearViewCameraViewController;
+        mCarServiceProvider = carServiceProvider;
+        mBroadcastDispatcher = broadcastDispatcher;
+    }
+
+    @Override
+    public void registerListeners() {
+        if (DBG) Slog.d(TAG, "RearViewCameraViewMediator:registerListeners");
+        if (!mRearViewCameraViewController.isEnabled()) {
+            Slog.i(TAG, "RearViewCameraViewController isn't enabled");
+            return;
+        }
+
+        mCarServiceProvider.addListener(car -> {
+            mCarPropertyManager = (CarPropertyManager) car.getCarManager(Car.PROPERTY_SERVICE);
+            if (mCarPropertyManager == null) {
+                Slog.e(TAG, "Unable to get CarPropertyManager");
+                return;
+            }
+            if (DBG) Slog.d(TAG, "Registering mPropertyEventCallback.");
+            mCarPropertyManager.registerCallback(mPropertyEventCallback,
+                    VehiclePropertyIds.GEAR_SELECTION, CarPropertyManager.SENSOR_RATE_UI);
+        });
+        mBroadcastDispatcher.registerReceiver(mBroadcastReceiver,
+                new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS), /* executor= */ null,
+                UserHandle.ALL);
+    }
+
+    @Override
+    public void setupOverlayContentViewControllers() {}
+}
diff --git a/packages/CarSystemUI/src/com/android/systemui/car/window/OverlayWindowModule.java b/packages/CarSystemUI/src/com/android/systemui/car/window/OverlayWindowModule.java
index 5a16efa3dd9bd..fcbb0b807e746 100644
--- a/packages/CarSystemUI/src/com/android/systemui/car/window/OverlayWindowModule.java
+++ b/packages/CarSystemUI/src/com/android/systemui/car/window/OverlayWindowModule.java
@@ -20,6 +20,7 @@ import com.android.systemui.car.keyguard.CarKeyguardViewMediator;
 import com.android.systemui.car.notification.BottomNotificationPanelViewMediator;
 import com.android.systemui.car.notification.NotificationPanelViewMediator;
 import com.android.systemui.car.notification.TopNotificationPanelViewMediator;
+import com.android.systemui.car.rvc.RearViewCameraViewMediator;
 import com.android.systemui.car.userswitcher.FullscreenUserSwitcherViewMediator;
 import com.android.systemui.car.userswitcher.UserSwitchTransitionViewMediator;
 
@@ -75,4 +76,11 @@ public abstract class OverlayWindowModule {
     @ClassKey(UserSwitchTransitionViewMediator.class)
     public abstract OverlayViewMediator bindUserSwitchTransitionViewMediator(
             UserSwitchTransitionViewMediator userSwitchTransitionViewMediator);
+
+    /** Injects RearViewCameraViewMediator. */
+    @Binds
+    @IntoMap
+    @ClassKey(RearViewCameraViewMediator.class)
+    public abstract OverlayViewMediator bindRearViewCameraViewMediator(
+            RearViewCameraViewMediator overlayViewsMediator);
 }
diff --git a/packages/CarSystemUI/tests/src/com/android/systemui/car/rvc/RearViewCameraViewControllerTest.java b/packages/CarSystemUI/tests/src/com/android/systemui/car/rvc/RearViewCameraViewControllerTest.java
new file mode 100644
index 0000000000000..a6160ecf1c629
--- /dev/null
+++ b/packages/CarSystemUI/tests/src/com/android/systemui/car/rvc/RearViewCameraViewControllerTest.java
@@ -0,0 +1,117 @@
+/*
+ * 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.systemui.car.rvc;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.verify;
+
+import android.app.ActivityView;
+import android.content.ComponentName;
+import android.content.Intent;
+import android.testing.TestableLooper;
+import android.view.LayoutInflater;
+import android.view.ViewGroup;
+
+import androidx.test.filters.SmallTest;
+
+import com.android.systemui.R;
+import com.android.systemui.SysuiTestCase;
+import com.android.systemui.car.CarSystemUiTest;
+import com.android.systemui.car.window.OverlayViewGlobalStateController;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Captor;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+@CarSystemUiTest
+@RunWith(MockitoJUnitRunner.class)
+@TestableLooper.RunWithLooper
+@SmallTest
+public class RearViewCameraViewControllerTest extends SysuiTestCase {
+    private static final String TEST_ACTIVITY_NAME = "testPackage/testActivity";
+    private RearViewCameraViewController mRearViewCameraViewController;
+
+    @Mock
+    private OverlayViewGlobalStateController mOverlayViewGlobalStateController;
+    @Mock
+    private ActivityView mMockActivityView;
+    @Captor
+    private ArgumentCaptor<Intent> mIntentCaptor;
+
+    private void setUpRearViewCameraViewController(String testActivityName) {
+        mContext.getOrCreateTestableResources().addOverride(
+                R.string.config_rearViewCameraActivity, testActivityName);
+        mRearViewCameraViewController = new RearViewCameraViewController(
+                mContext.getOrCreateTestableResources().getResources(),
+                mOverlayViewGlobalStateController);
+        mRearViewCameraViewController.inflate((ViewGroup) LayoutInflater.from(mContext).inflate(
+                R.layout.sysui_overlay_window, /* root= */ null));
+    }
+
+    @Test
+    public void testEmptyResourceDisablesController() {
+        setUpRearViewCameraViewController("");
+
+        assertThat(mRearViewCameraViewController.isEnabled()).isFalse();
+    }
+
+    @Test
+    public void testNonEmptyResourceEnablesController() {
+        setUpRearViewCameraViewController(TEST_ACTIVITY_NAME);
+
+        assertThat(mRearViewCameraViewController.isEnabled()).isTrue();
+    }
+
+    @Test
+    public void testShowInternal() {
+        setUpRearViewCameraViewController(TEST_ACTIVITY_NAME);
+        assertThat(mRearViewCameraViewController.isShown()).isFalse();
+        assertThat(mRearViewCameraViewController.mActivityView).isNull();
+
+        mRearViewCameraViewController.showInternal();
+
+        assertThat(mRearViewCameraViewController.isShown()).isTrue();
+        assertThat(mRearViewCameraViewController.mActivityView).isNotNull();
+    }
+
+    @Test
+    public void testHideInternal() {
+        setUpRearViewCameraViewController(TEST_ACTIVITY_NAME);
+        assertThat(mRearViewCameraViewController.isShown()).isFalse();
+        mRearViewCameraViewController.showInternal();
+        assertThat(mRearViewCameraViewController.isShown()).isTrue();
+
+        mRearViewCameraViewController.hideInternal();
+
+        assertThat(mRearViewCameraViewController.isShown()).isFalse();
+        assertThat(mRearViewCameraViewController.mActivityView).isNull();
+    }
+
+    @Test
+    public void testOnActivityViewReady_fireIntent() {
+        setUpRearViewCameraViewController(TEST_ACTIVITY_NAME);
+        mRearViewCameraViewController.mActivityViewCallback.onActivityViewReady(mMockActivityView);
+
+        verify(mMockActivityView).startActivity(mIntentCaptor.capture());
+        ComponentName expectedComponent = ComponentName.unflattenFromString(TEST_ACTIVITY_NAME);
+        assertThat(mIntentCaptor.getValue().getComponent()).isEqualTo(expectedComponent);
+    }
+}
diff --git a/packages/CarSystemUI/tests/src/com/android/systemui/car/rvc/RearViewCameraViewMediatorTest.java b/packages/CarSystemUI/tests/src/com/android/systemui/car/rvc/RearViewCameraViewMediatorTest.java
new file mode 100644
index 0000000000000..5be8f91ff430f
--- /dev/null
+++ b/packages/CarSystemUI/tests/src/com/android/systemui/car/rvc/RearViewCameraViewMediatorTest.java
@@ -0,0 +1,169 @@
+/*
+ * 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.systemui.car.rvc;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyFloat;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.car.Car;
+import android.car.VehicleAreaType;
+import android.car.VehicleGear;
+import android.car.VehiclePropertyIds;
+import android.car.hardware.CarPropertyValue;
+import android.car.hardware.property.CarPropertyManager;
+import android.car.hardware.property.CarPropertyManager.CarPropertyEventCallback;
+import android.content.BroadcastReceiver;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.testing.TestableLooper;
+import android.util.Log;
+
+import androidx.test.filters.SmallTest;
+
+import com.android.systemui.SysuiTestCase;
+import com.android.systemui.broadcast.BroadcastDispatcher;
+import com.android.systemui.car.CarServiceProvider;
+import com.android.systemui.car.CarServiceProvider.CarServiceOnConnectedListener;
+import com.android.systemui.car.CarSystemUiTest;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Captor;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+@CarSystemUiTest
+@RunWith(MockitoJUnitRunner.class)
+@TestableLooper.RunWithLooper
+@SmallTest
+public class RearViewCameraViewMediatorTest extends SysuiTestCase {
+    private static final String TAG = RearViewCameraViewMediatorTest.class.getSimpleName();
+
+    private RearViewCameraViewMediator mRearViewCameraViewMediator;
+
+    @Mock
+    private CarServiceProvider mCarServiceProvider;
+    @Mock
+    private Car mCar;
+    @Mock
+    private CarPropertyManager mCarPropertyManager;
+    @Captor
+    private ArgumentCaptor<CarPropertyEventCallback> mCarPropertyEventCallbackCaptor;
+
+    @Mock
+    private BroadcastDispatcher mBroadcastDispatcher;
+    @Captor
+    private ArgumentCaptor<BroadcastReceiver> mBroadcastReceiverCaptor;
+    @Captor
+    private ArgumentCaptor<IntentFilter> mIntentFilterCaptor;
+
+    @Mock
+    private RearViewCameraViewController mRearViewCameraViewController;
+
+    @Before
+    public void setUp() throws Exception {
+        mRearViewCameraViewMediator = new RearViewCameraViewMediator(
+                mRearViewCameraViewController, mCarServiceProvider, mBroadcastDispatcher);
+    }
+
+    public void setUpListener() {
+        doAnswer(invocation -> {
+            CarServiceOnConnectedListener listener = invocation.getArgument(0);
+            listener.onConnected(mCar);
+            return null;
+        }).when(mCarServiceProvider).addListener(any(CarServiceOnConnectedListener.class));
+        when(mCar.getCarManager(Car.PROPERTY_SERVICE)).thenReturn(mCarPropertyManager);
+        when(mRearViewCameraViewController.isEnabled()).thenReturn(true);
+
+        mRearViewCameraViewMediator.registerListeners();
+
+        verify(mCarPropertyManager).registerCallback(mCarPropertyEventCallbackCaptor.capture(),
+                eq(VehiclePropertyIds.GEAR_SELECTION), anyFloat());
+        verify(mBroadcastDispatcher).registerReceiver(mBroadcastReceiverCaptor.capture(),
+                mIntentFilterCaptor.capture(), any(), any());
+        assertThat(mIntentFilterCaptor.getValue().getAction(0)).isEqualTo(
+                Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
+    }
+
+    @Test
+    public void testDoesnNotRegisterListenersWhenRearViewCameraViewControllerIsDisabled() {
+        when(mRearViewCameraViewController.isEnabled()).thenReturn(false);
+
+        mRearViewCameraViewMediator.registerListeners();
+
+        verify(mCarPropertyManager, never()).registerCallback(any(), anyInt(), anyFloat());
+        verify(mBroadcastDispatcher, never()).registerReceiver(any(), any(), any());
+    }
+
+    @Test
+    public void testGearReverseStartsRearViewCamera() {
+        setUpListener();
+
+        CarPropertyValue<Integer> gearReverse = new CarPropertyValue(
+                VehiclePropertyIds.GEAR_SELECTION, VehicleAreaType.VEHICLE_AREA_TYPE_GLOBAL,
+                VehicleGear.GEAR_REVERSE);
+        mCarPropertyEventCallbackCaptor.getValue().onChangeEvent(gearReverse);
+
+        verify(mRearViewCameraViewController, times(1)).start();
+    }
+
+    @Test
+    public void testGearNonReverseStopsRearViewCamera() {
+        setUpListener();
+
+        int[] nonReverseVehicleGears = new int[]{
+                VehicleGear.GEAR_NEUTRAL, VehicleGear.GEAR_PARK, VehicleGear.GEAR_DRIVE,
+                VehicleGear.GEAR_FIRST
+        };
+        for (int i = 0; i < nonReverseVehicleGears.length; ++i) {
+            Log.i(TAG, "testGearNonReverseStopsRearViewCamera: gear=" + nonReverseVehicleGears[i]);
+            CarPropertyValue<Integer> propertyGear = new CarPropertyValue(
+                    VehiclePropertyIds.GEAR_SELECTION, VehicleAreaType.VEHICLE_AREA_TYPE_GLOBAL,
+                    nonReverseVehicleGears[i]);
+            mCarPropertyEventCallbackCaptor.getValue().onChangeEvent(propertyGear);
+
+            verify(mRearViewCameraViewController, times(i + 1)).stop();
+        }
+    }
+
+    @Test
+    public void testBroadcastIntentStopsRearViewCamera() {
+        setUpListener();
+        when(mRearViewCameraViewController.isShown()).thenReturn(true);
+
+        Intent randomIntent = new Intent(Intent.ACTION_MAIN);
+        mBroadcastReceiverCaptor.getValue().onReceive(mContext, randomIntent);
+
+        verify(mRearViewCameraViewController, never()).stop();
+
+        Intent actionCloseSystemDialogs = new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
+        mBroadcastReceiverCaptor.getValue().onReceive(mContext, actionCloseSystemDialogs);
+
+        verify(mRearViewCameraViewController, times(1)).stop();
+    }
+}