services/tests/wmtests/src/com/android/server/wm/RootActivityContainerTests.java

/*
 * 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.server.wm;

import static android.app.WindowConfiguration.ACTIVITY_TYPE_HOME;
import static android.app.WindowConfiguration.ACTIVITY_TYPE_RECENTS;
import static android.app.WindowConfiguration.ACTIVITY_TYPE_STANDARD;
import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN;
import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN_OR_SPLIT_SCREEN_SECONDARY;
import static android.app.WindowConfiguration.WINDOWING_MODE_PINNED;
import static android.app.WindowConfiguration.WINDOWING_MODE_SPLIT_SCREEN_PRIMARY;
import static android.content.pm.ActivityInfo.FLAG_ALWAYS_FOCUSABLE;
import static android.view.Display.DEFAULT_DISPLAY;
import static android.view.Display.TYPE_VIRTUAL;

import static com.android.dx.mockito.inline.extended.ExtendedMockito.doNothing;
import static com.android.dx.mockito.inline.extended.ExtendedMockito.doReturn;
import static com.android.dx.mockito.inline.extended.ExtendedMockito.mock;
import static com.android.dx.mockito.inline.extended.ExtendedMockito.never;
import static com.android.dx.mockito.inline.extended.ExtendedMockito.reset;
import static com.android.dx.mockito.inline.extended.ExtendedMockito.spy;
import static com.android.dx.mockito.inline.extended.ExtendedMockito.spyOn;
import static com.android.dx.mockito.inline.extended.ExtendedMockito.times;
import static com.android.dx.mockito.inline.extended.ExtendedMockito.verify;
import static com.android.server.wm.ActivityStackSupervisor.ON_TOP;
import static com.android.server.wm.RootWindowContainer.MATCH_TASK_IN_STACKS_OR_RECENT_TASKS_AND_RESTORE;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyBoolean;
import static org.mockito.ArgumentMatchers.anyInt;
import static org.mockito.ArgumentMatchers.contains;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.ArgumentMatchers.refEq;

import android.app.ActivityOptions;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.ApplicationInfo;
import android.content.pm.ResolveInfo;
import android.content.res.Resources;
import android.graphics.Rect;
import android.platform.test.annotations.Presubmit;
import android.util.Pair;

import androidx.test.filters.MediumTest;

import com.android.internal.app.ResolverActivity;
import com.android.server.wm.ActivityStack.ActivityState;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Consumer;

/**
 * Tests for the {@link RootWindowContainer} class.
 *
 * Build/Install/Run:
 *  atest WmTests:RootActivityContainerTests
 */
@MediumTest
@Presubmit
@RunWith(WindowTestRunner.class)
public class RootActivityContainerTests extends ActivityTestsBase {
    private ActivityStack mFullscreenStack;

    @Before
    public void setUp() throws Exception {
        mFullscreenStack = mRootWindowContainer.getDefaultDisplay().createStack(
                WINDOWING_MODE_FULLSCREEN, ACTIVITY_TYPE_STANDARD, true /* onTop */);
        doNothing().when(mService).updateSleepIfNeededLocked();
    }

    /**
     * This test ensures that we do not try to restore a task based off an invalid task id. We
     * should expect {@code null} to be returned in this case.
     */
    @Test
    public void testRestoringInvalidTask() {
        mRootWindowContainer.getDefaultDisplay().removeAllTasks();
        Task task = mRootWindowContainer.anyTaskForId(0 /*taskId*/,
                MATCH_TASK_IN_STACKS_OR_RECENT_TASKS_AND_RESTORE, null, false /* onTop */);
        assertNull(task);
    }

    /**
     * This test ensures that an existing task in the pinned stack is moved to the fullscreen
     * activity stack when a new task is added.
     */
    @Test
    public void testReplacingTaskInPinnedStack() {
        final ActivityRecord firstActivity = new ActivityBuilder(mService).setCreateTask(true)
                .setStack(mFullscreenStack).build();
        final Task task = firstActivity.getTask();

        final ActivityRecord secondActivity = new ActivityBuilder(mService).setTask(task)
                .setStack(mFullscreenStack).build();

        mFullscreenStack.moveToFront("testReplacingTaskInPinnedStack");

        // Ensure full screen stack has both tasks.
        ensureStackPlacement(mFullscreenStack, firstActivity, secondActivity);

        // Move first activity to pinned stack.
        final Rect sourceBounds = new Rect();
        mRootWindowContainer.moveActivityToPinnedStack(firstActivity, sourceBounds,
                0f /*aspectRatio*/, "initialMove");

        final DisplayContent display = mFullscreenStack.getDisplay();
        ActivityStack pinnedStack = display.getRootPinnedTask();
        // Ensure a task has moved over.
        ensureStackPlacement(pinnedStack, firstActivity);
        ensureStackPlacement(mFullscreenStack, secondActivity);

        // Move second activity to pinned stack.
        mRootWindowContainer.moveActivityToPinnedStack(secondActivity, sourceBounds,
                0f /*aspectRatio*/, "secondMove");

        // Need to get stacks again as a new instance might have been created.
        pinnedStack = display.getRootPinnedTask();
        mFullscreenStack = display.getStack(WINDOWING_MODE_FULLSCREEN, ACTIVITY_TYPE_STANDARD);
        // Ensure stacks have swapped tasks.
        ensureStackPlacement(pinnedStack, secondActivity);
        ensureStackPlacement(mFullscreenStack, firstActivity);
    }

    private static void ensureStackPlacement(ActivityStack stack, ActivityRecord... activities) {
        final Task task = stack.getBottomMostTask();
        final ArrayList<ActivityRecord> stackActivities = new ArrayList<>();

        task.forAllActivities((Consumer<ActivityRecord>) stackActivities::add, false);

        assertEquals("Expecting " + Arrays.deepToString(activities) + " got " + stackActivities,
                stackActivities.size(), activities != null ? activities.length : 0);

        if (activities == null) {
            return;
        }

        for (ActivityRecord activity : activities) {
            assertTrue(stackActivities.contains(activity));
        }
    }

    @Test
    public void testApplySleepTokens() {
        final DisplayContent display = mRootWindowContainer.getDefaultDisplay();
        final KeyguardController keyguard = mSupervisor.getKeyguardController();
        final ActivityStack stack = new StackBuilder(mRootWindowContainer)
                .setCreateActivity(false)
                .setDisplay(display)
                .setOnTop(false)
                .build();

        // Make sure we wake and resume in the case the display is turning on and the keyguard is
        // not showing.
        verifySleepTokenBehavior(display, keyguard, stack, true /*displaySleeping*/,
                false /* displayShouldSleep */, true /* isFocusedStack */,
                false /* keyguardShowing */, true /* expectWakeFromSleep */,
                true /* expectResumeTopActivity */);

        // Make sure we wake and don't resume when the display is turning on and the keyguard is
        // showing.
        verifySleepTokenBehavior(display, keyguard, stack, true /*displaySleeping*/,
                false /* displayShouldSleep */, true /* isFocusedStack */,
                true /* keyguardShowing */, true /* expectWakeFromSleep */,
                false /* expectResumeTopActivity */);

        // Make sure we wake and don't resume when the display is turning on and the keyguard is
        // not showing as unfocused.
        verifySleepTokenBehavior(display, keyguard, stack, true /*displaySleeping*/,
                false /* displayShouldSleep */, false /* isFocusedStack */,
                false /* keyguardShowing */, true /* expectWakeFromSleep */,
                false /* expectResumeTopActivity */);

        // Should not do anything if the display state hasn't changed.
        verifySleepTokenBehavior(display, keyguard, stack, false /*displaySleeping*/,
                false /* displayShouldSleep */, true /* isFocusedStack */,
                false /* keyguardShowing */, false /* expectWakeFromSleep */,
                false /* expectResumeTopActivity */);
    }

    private void verifySleepTokenBehavior(DisplayContent display, KeyguardController keyguard,
            ActivityStack stack, boolean displaySleeping, boolean displayShouldSleep,
            boolean isFocusedStack, boolean keyguardShowing, boolean expectWakeFromSleep,
            boolean expectResumeTopActivity) {
        reset(stack);

        doReturn(displayShouldSleep).when(display).shouldSleep();
        doReturn(displaySleeping).when(display).isSleeping();
        doReturn(keyguardShowing).when(keyguard).isKeyguardOrAodShowing(anyInt());

        doReturn(isFocusedStack).when(stack).isFocusedStackOnDisplay();
        doReturn(isFocusedStack ? stack : null).when(display).getFocusedStack();
        mRootWindowContainer.applySleepTokens(true);
        verify(stack, times(expectWakeFromSleep ? 1 : 0)).awakeFromSleepingLocked();
        verify(stack, times(expectResumeTopActivity ? 1 : 0)).resumeTopActivityUncheckedLocked(
                null /* target */, null /* targetOptions */);
    }

    /**
     * Verifies that removal of activity with task and stack is done correctly.
     */
    @Test
    public void testRemovingStackOnAppCrash() {
        final DisplayContent defaultDisplay = mRootWindowContainer.getDefaultDisplay();
        final int originalStackCount = defaultDisplay.getStackCount();
        final ActivityStack stack = mRootWindowContainer.getDefaultDisplay().createStack(
                WINDOWING_MODE_FULLSCREEN, ACTIVITY_TYPE_STANDARD, false /* onTop */);
        final ActivityRecord firstActivity = new ActivityBuilder(mService).setCreateTask(true)
                .setStack(stack).build();

        assertEquals(originalStackCount + 1, defaultDisplay.getStackCount());

        // Let's pretend that the app has crashed.
        firstActivity.app.setThread(null);
        mRootWindowContainer.finishTopCrashedActivities(firstActivity.app, "test");

        // Verify that the stack was removed.
        assertEquals(originalStackCount, defaultDisplay.getStackCount());
    }

    @Test
    public void testFocusability() {
        final ActivityStack stack = mRootWindowContainer.getDefaultDisplay().createStack(
                WINDOWING_MODE_SPLIT_SCREEN_PRIMARY, ACTIVITY_TYPE_STANDARD, true /* onTop */);
        final ActivityRecord activity = new ActivityBuilder(mService).setCreateTask(true)
                .setStack(stack).build();

        // Created stacks are focusable by default.
        assertTrue(stack.isTopActivityFocusable());
        assertTrue(activity.isFocusable());

        // If the stack is made unfocusable, its activities should inherit that.
        stack.setFocusable(false);
        assertFalse(stack.isTopActivityFocusable());
        assertFalse(activity.isFocusable());

        final ActivityStack pinnedStack = mRootWindowContainer.getDefaultDisplay().createStack(
                WINDOWING_MODE_PINNED, ACTIVITY_TYPE_STANDARD, true /* onTop */);
        final ActivityRecord pinnedActivity = new ActivityBuilder(mService).setCreateTask(true)
                .setStack(pinnedStack).build();

        // We should not be focusable when in pinned mode
        assertFalse(pinnedStack.isTopActivityFocusable());
        assertFalse(pinnedActivity.isFocusable());

        // Add flag forcing focusability.
        pinnedActivity.info.flags |= FLAG_ALWAYS_FOCUSABLE;

        // We should not be focusable when in pinned mode
        assertTrue(pinnedStack.isTopActivityFocusable());
        assertTrue(pinnedActivity.isFocusable());

        // Without the overridding activity, stack should not be focusable.
        pinnedStack.removeChild(pinnedActivity.getTask(), "testFocusability");
        assertFalse(pinnedStack.isTopActivityFocusable());
    }

    /**
     * Verify that split-screen primary stack will be chosen if activity is launched that targets
     * split-screen secondary, but a matching existing instance is found on top of split-screen
     * primary stack.
     */
    @Test
    public void testSplitScreenPrimaryChosenWhenTopActivityLaunchedToSecondary() {
        // Create primary split-screen stack with a task and an activity.
        final ActivityStack primaryStack = mRootWindowContainer.getDefaultDisplay()
                .createStack(WINDOWING_MODE_SPLIT_SCREEN_PRIMARY, ACTIVITY_TYPE_STANDARD,
                        true /* onTop */);
        final Task task = new TaskBuilder(mSupervisor).setStack(primaryStack).build();
        final ActivityRecord r = new ActivityBuilder(mService).setTask(task).build();

        // Find a launch stack for the top activity in split-screen primary, while requesting
        // split-screen secondary.
        final ActivityOptions options = ActivityOptions.makeBasic();
        options.setLaunchWindowingMode(WINDOWING_MODE_FULLSCREEN_OR_SPLIT_SCREEN_SECONDARY);
        final ActivityStack result =
                mRootWindowContainer.getLaunchStack(r, options, task, true /* onTop */);

        // Assert that the primary stack is returned.
        assertEquals(primaryStack, result);
    }

    /**
     * Verify that home stack would be moved to front when the top activity is Recents.
     */
    @Test
    public void testFindTaskToMoveToFrontWhenRecentsOnTop() {
        // Create stack/task on default display.
        final DisplayContent display = mRootWindowContainer.getDefaultDisplay();
        final ActivityStack targetStack = new StackBuilder(mRootWindowContainer)
                .setOnTop(false)
                .build();
        final Task targetTask = targetStack.getBottomMostTask();

        // Create Recents on top of the display.
        final ActivityStack stack = new StackBuilder(mRootWindowContainer).setActivityType(
                ACTIVITY_TYPE_RECENTS).build();

        final String reason = "findTaskToMoveToFront";
        mSupervisor.findTaskToMoveToFront(targetTask, 0, ActivityOptions.makeBasic(), reason,
                false);

        verify(display).moveHomeStackToFront(contains(reason));
    }

    /**
     * Verify that home stack won't be moved to front if the top activity on other display is
     * Recents.
     */
    @Test
    public void testFindTaskToMoveToFrontWhenRecentsOnOtherDisplay() {
        // Create stack/task on default display.
        final DisplayContent display = mRootWindowContainer.getDefaultDisplay();
        final ActivityStack targetStack = display.createStack(WINDOWING_MODE_FULLSCREEN,
                ACTIVITY_TYPE_STANDARD, false /* onTop */);
        final Task targetTask = new TaskBuilder(mSupervisor).setStack(targetStack).build();

        // Create Recents on secondary display.
        final TestDisplayContent secondDisplay = addNewDisplayContentAt(
                DisplayContent.POSITION_TOP);
        final ActivityStack stack = secondDisplay.createStack(WINDOWING_MODE_FULLSCREEN,
                ACTIVITY_TYPE_RECENTS, true /* onTop */);
        final Task task = new TaskBuilder(mSupervisor).setStack(stack).build();
        new ActivityBuilder(mService).setTask(task).build();

        final String reason = "findTaskToMoveToFront";
        mSupervisor.findTaskToMoveToFront(targetTask, 0, ActivityOptions.makeBasic(), reason,
                false);

        verify(display, never()).moveHomeStackToFront(contains(reason));
    }

    /**
     * Verify if a stack is not at the topmost position, it should be able to resume its activity if
     * the stack is the top focused.
     */
    @Test
    public void testResumeActivityWhenNonTopmostStackIsTopFocused() {
        // Create a stack at bottom.
        final DisplayContent display = mRootWindowContainer.getDefaultDisplay();
        final ActivityStack targetStack = spy(display.createStack(WINDOWING_MODE_FULLSCREEN,
                ACTIVITY_TYPE_STANDARD, false /* onTop */));
        final Task task = new TaskBuilder(mSupervisor).setStack(targetStack).build();
        final ActivityRecord activity = new ActivityBuilder(mService).setTask(task).build();
        display.positionStackAtBottom(targetStack);

        // Assume the stack is not at the topmost position (e.g. behind always-on-top stacks) but it
        // is the current top focused stack.
        assertFalse(targetStack.isTopStackOnDisplay());
        doReturn(targetStack).when(mRootWindowContainer).getTopDisplayFocusedStack();

        // Use the stack as target to resume.
        mRootWindowContainer.resumeFocusedStacksTopActivities(
                targetStack, activity, null /* targetOptions */);

        // Verify the target stack should resume its activity.
        verify(targetStack, times(1)).resumeTopActivityUncheckedLocked(
                eq(activity), eq(null /* targetOptions */));
    }

    /**
     * Verify that home activity will be started on a display even if another display has a
     * focusable activity.
     */
    @Test
    public void testResumeFocusedStacksStartsHomeActivity_NoActivities() {
        mFullscreenStack.removeIfPossible();
        mService.mRootWindowContainer.getDisplayContent(DEFAULT_DISPLAY).getRootHomeTask()
                .removeIfPossible();
        mService.mRootWindowContainer.getDisplayContent(DEFAULT_DISPLAY)
                .createStack(WINDOWING_MODE_FULLSCREEN, ACTIVITY_TYPE_HOME, ON_TOP);

        doReturn(true).when(mRootWindowContainer).resumeHomeActivity(any(), any(), anyInt());

        mService.setBooted(true);

        // Trigger resume on all displays
        mRootWindowContainer.resumeFocusedStacksTopActivities();

        // Verify that home activity was started on the default display
        verify(mRootWindowContainer).resumeHomeActivity(any(), any(), eq(DEFAULT_DISPLAY));
    }

    /**
     * Verify that home activity will be started on a display even if another display has a
     * focusable activity.
     */
    @Test
    public void testResumeFocusedStacksStartsHomeActivity_ActivityOnSecondaryScreen() {
        mFullscreenStack.removeIfPossible();
        mService.mRootWindowContainer.getDisplayContent(DEFAULT_DISPLAY).getRootHomeTask()
                .removeIfPossible();
        mService.mRootWindowContainer.getDisplayContent(DEFAULT_DISPLAY)
                .createStack(WINDOWING_MODE_FULLSCREEN, ACTIVITY_TYPE_HOME, ON_TOP);

        // Create an activity on secondary display.
        final TestDisplayContent secondDisplay = addNewDisplayContentAt(
                DisplayContent.POSITION_TOP);
        final ActivityStack stack = secondDisplay.createStack(WINDOWING_MODE_FULLSCREEN,
                ACTIVITY_TYPE_STANDARD, true /* onTop */);
        final Task task = new TaskBuilder(mSupervisor).setStack(stack).build();
        new ActivityBuilder(mService).setTask(task).build();

        doReturn(true).when(mRootWindowContainer).resumeHomeActivity(any(), any(), anyInt());

        mService.setBooted(true);

        // Trigger resume on all displays
        mRootWindowContainer.resumeFocusedStacksTopActivities();

        // Verify that home activity was started on the default display
        verify(mRootWindowContainer).resumeHomeActivity(any(), any(), eq(DEFAULT_DISPLAY));
    }

    /**
     * Verify that a lingering transition is being executed in case the activity to be resumed is
     * already resumed
     */
    @Test
    public void testResumeActivityLingeringTransition() {
        // Create a stack at top.
        final DisplayContent display = mRootWindowContainer.getDefaultDisplay();
        final ActivityStack targetStack = spy(display.createStack(WINDOWING_MODE_FULLSCREEN,
                ACTIVITY_TYPE_STANDARD, false /* onTop */));
        final Task task = new TaskBuilder(mSupervisor).setStack(targetStack).build();
        final ActivityRecord activity = new ActivityBuilder(mService).setTask(task).build();
        activity.setState(ActivityState.RESUMED, "test");

        // Assume the stack is at the topmost position
        assertTrue(targetStack.isTopStackOnDisplay());

        // Use the stack as target to resume.
        mRootWindowContainer.resumeFocusedStacksTopActivities();

        // Verify the lingering app transition is being executed because it's already resumed
        verify(targetStack, times(1)).executeAppTransition(any());
    }

    @Test
    public void testResumeActivityLingeringTransition_notExecuted() {
        // Create a stack at bottom.
        final DisplayContent display = mRootWindowContainer.getDefaultDisplay();
        final ActivityStack targetStack = spy(display.createStack(WINDOWING_MODE_FULLSCREEN,
                ACTIVITY_TYPE_STANDARD, false /* onTop */));
        final Task task = new TaskBuilder(mSupervisor).setStack(targetStack).build();
        final ActivityRecord activity = new ActivityBuilder(mService).setTask(task).build();
        activity.setState(ActivityState.RESUMED, "test");
        display.positionStackAtBottom(targetStack);

        // Assume the stack is at the topmost position
        assertFalse(targetStack.isTopStackOnDisplay());
        doReturn(targetStack).when(mRootWindowContainer).getTopDisplayFocusedStack();

        // Use the stack as target to resume.
        mRootWindowContainer.resumeFocusedStacksTopActivities();

        // Verify the lingering app transition is being executed because it's already resumed
        verify(targetStack, never()).executeAppTransition(any());
    }

    /**
     * Tests that home activities can be started on the displays that supports system decorations.
     */
    @Test
    public void testStartHomeOnAllDisplays() {
        mockResolveHomeActivity(true /* primaryHome */, false /* forceSystemProvided */);
        mockResolveSecondaryHomeActivity();

        // Create secondary displays.
        final TestDisplayContent secondDisplay =
                new TestDisplayContent.Builder(mService, 1000, 1500)
                        .setSystemDecorations(true).build();

        doReturn(true).when(mRootWindowContainer)
                .ensureVisibilityAndConfig(any(), anyInt(), anyBoolean(), anyBoolean());
        doReturn(true).when(mRootWindowContainer).canStartHomeOnDisplay(
                any(), anyInt(), anyBoolean());

        mRootWindowContainer.startHomeOnAllDisplays(0, "testStartHome");

        assertTrue(mRootWindowContainer.getDefaultDisplay().getTopStack().isActivityTypeHome());
        assertNotNull(secondDisplay.getTopStack());
        assertTrue(secondDisplay.getTopStack().isActivityTypeHome());
    }

    /**
     * Tests that home activities won't be started before booting when display added.
     */
    @Test
    public void testNotStartHomeBeforeBoot() {
        final int displayId = 1;
        final boolean isBooting = mService.mAmInternal.isBooting();
        final boolean isBooted = mService.mAmInternal.isBooted();
        try {
            mService.mAmInternal.setBooting(false);
            mService.mAmInternal.setBooted(false);
            mRootWindowContainer.onDisplayAdded(displayId);
            verify(mRootWindowContainer, never()).startHomeOnDisplay(anyInt(), any(), anyInt());
        } finally {
            mService.mAmInternal.setBooting(isBooting);
            mService.mAmInternal.setBooted(isBooted);
        }
    }

    /**
     * Tests whether home can be started if being instrumented.
     */
    @Test
    public void testCanStartHomeWhenInstrumented() {
        final ActivityInfo info = new ActivityInfo();
        info.applicationInfo = new ApplicationInfo();
        final WindowProcessController app = mock(WindowProcessController.class);
        doReturn(app).when(mService).getProcessController(any(), anyInt());

        // Can not start home if we don't want to start home while home is being instrumented.
        doReturn(true).when(app).isInstrumenting();
        assertFalse(mRootWindowContainer.canStartHomeOnDisplay(info, DEFAULT_DISPLAY,
                false /* allowInstrumenting*/));

        // Can start home for other cases.
        assertTrue(mRootWindowContainer.canStartHomeOnDisplay(info, DEFAULT_DISPLAY,
                true /* allowInstrumenting*/));

        doReturn(false).when(app).isInstrumenting();
        assertTrue(mRootWindowContainer.canStartHomeOnDisplay(info, DEFAULT_DISPLAY,
                false /* allowInstrumenting*/));
        assertTrue(mRootWindowContainer.canStartHomeOnDisplay(info, DEFAULT_DISPLAY,
                true /* allowInstrumenting*/));
    }

    /**
     * Tests that secondary home activity should not be resolved if device is still locked.
     */
    @Test
    public void testStartSecondaryHomeOnDisplayWithUserKeyLocked() {
        // Create secondary displays.
        final TestDisplayContent secondDisplay =
                new TestDisplayContent.Builder(mService, 1000, 1500)
                        .setSystemDecorations(true).build();

        // Use invalid user id to let StorageManager.isUserKeyUnlocked() return false.
        final int currentUser = mRootWindowContainer.mCurrentUser;
        mRootWindowContainer.mCurrentUser = -1;

        mRootWindowContainer.startHomeOnDisplay(0 /* userId */, "testStartSecondaryHome",
                secondDisplay.mDisplayId, true /* allowInstrumenting */, true /* fromHomeKey */);

        try {
            verify(mRootWindowContainer, never()).resolveSecondaryHomeActivity(anyInt(),
                    anyInt());
        } finally {
            mRootWindowContainer.mCurrentUser = currentUser;
        }
    }

    /**
     * Tests that secondary home activity should not be resolved if display does not support system
     * decorations.
     */
    @Test
    public void testStartSecondaryHomeOnDisplayWithoutSysDecorations() {
        // Create secondary displays.
        final TestDisplayContent secondDisplay =
                new TestDisplayContent.Builder(mService, 1000, 1500)
                        .setSystemDecorations(false).build();

        mRootWindowContainer.startHomeOnDisplay(0 /* userId */, "testStartSecondaryHome",
                secondDisplay.mDisplayId, true /* allowInstrumenting */, true /* fromHomeKey */);

        verify(mRootWindowContainer, never()).resolveSecondaryHomeActivity(anyInt(), anyInt());
    }

    /**
     * Tests that when starting {@link #ResolverActivity} for home, it should use the standard
     * activity type (in a new stack) so the order of back stack won't be broken.
     */
    @Test
    public void testStartResolverActivityForHome() {
        final ActivityInfo info = new ActivityInfo();
        info.applicationInfo = new ApplicationInfo();
        info.applicationInfo.packageName = "android";
        info.name = ResolverActivity.class.getName();
        doReturn(info).when(mRootWindowContainer).resolveHomeActivity(anyInt(), any());

        mRootWindowContainer.startHomeOnDisplay(0 /* userId */, "test", DEFAULT_DISPLAY);
        final ActivityRecord resolverActivity = mRootWindowContainer.topRunningActivity();

        assertEquals(info, resolverActivity.info);
        assertEquals(ACTIVITY_TYPE_STANDARD, resolverActivity.getRootTask().getActivityType());
    }

    /**
     * Tests that secondary home should be selected if primary home not set.
     */
    @Test
    public void testResolveSecondaryHomeActivityWhenPrimaryHomeNotSet() {
        // Setup: primary home not set.
        final Intent primaryHomeIntent = mService.getHomeIntent();
        final ActivityInfo aInfoPrimary = new ActivityInfo();
        aInfoPrimary.name = ResolverActivity.class.getName();
        doReturn(aInfoPrimary).when(mRootWindowContainer).resolveHomeActivity(anyInt(),
                refEq(primaryHomeIntent));
        // Setup: set secondary home.
        mockResolveHomeActivity(false /* primaryHome */, false /* forceSystemProvided */);

        // Run the test.
        final Pair<ActivityInfo, Intent> resolvedInfo = mRootWindowContainer
                .resolveSecondaryHomeActivity(0 /* userId */, 1 /* displayId */);
        final ActivityInfo aInfoSecondary = getFakeHomeActivityInfo(false /* primaryHome*/);
        assertEquals(aInfoSecondary.name, resolvedInfo.first.name);
        assertEquals(aInfoSecondary.applicationInfo.packageName,
                resolvedInfo.first.applicationInfo.packageName);
    }

    /**
     * Tests that the default secondary home activity is always picked when it is in forced by
     * config_useSystemProvidedLauncherForSecondary.
     */
    @Test
    public void testResolveSecondaryHomeActivityForced() {
        // SetUp: set primary home.
        mockResolveHomeActivity(true /* primaryHome */, false /* forceSystemProvided */);
        // SetUp: set secondary home and force it.
        mockResolveHomeActivity(false /* primaryHome */, true /* forceSystemProvided */);
        final Intent secondaryHomeIntent =
                mService.getSecondaryHomeIntent(null /* preferredPackage */);
        final List<ResolveInfo> resolutions = new ArrayList<>();
        final ResolveInfo resolveInfo = new ResolveInfo();
        final ActivityInfo aInfoSecondary = getFakeHomeActivityInfo(false /* primaryHome*/);
        resolveInfo.activityInfo = aInfoSecondary;
        resolutions.add(resolveInfo);
        doReturn(resolutions).when(mRootWindowContainer).resolveActivities(anyInt(),
                refEq(secondaryHomeIntent));
        doReturn(true).when(mRootWindowContainer).canStartHomeOnDisplay(
                any(), anyInt(), anyBoolean());

        // Run the test.
        final Pair<ActivityInfo, Intent> resolvedInfo = mRootWindowContainer
                .resolveSecondaryHomeActivity(0 /* userId */, 1 /* displayId */);
        assertEquals(aInfoSecondary.name, resolvedInfo.first.name);
        assertEquals(aInfoSecondary.applicationInfo.packageName,
                resolvedInfo.first.applicationInfo.packageName);
    }

    /**
     * Tests that secondary home should be selected if primary home not support secondary displays
     * or there is no matched activity in the same package as selected primary home.
     */
    @Test
    public void testResolveSecondaryHomeActivityWhenPrimaryHomeNotSupportMultiDisplay() {
        // Setup: there is no matched activity in the same package as selected primary home.
        mockResolveHomeActivity(true /* primaryHome */, false /* forceSystemProvided */);
        final List<ResolveInfo> resolutions = new ArrayList<>();
        doReturn(resolutions).when(mRootWindowContainer).resolveActivities(anyInt(), any());
        // Setup: set secondary home.
        mockResolveHomeActivity(false /* primaryHome */, false /* forceSystemProvided */);

        // Run the test.
        final Pair<ActivityInfo, Intent> resolvedInfo = mRootWindowContainer
                .resolveSecondaryHomeActivity(0 /* userId */, 1 /* displayId */);
        final ActivityInfo aInfoSecondary = getFakeHomeActivityInfo(false /* primaryHome*/);
        assertEquals(aInfoSecondary.name, resolvedInfo.first.name);
        assertEquals(aInfoSecondary.applicationInfo.packageName,
                resolvedInfo.first.applicationInfo.packageName);
    }
    /**
     * Tests that primary home activity should be selected if it already support secondary displays.
     */
    @Test
    public void testResolveSecondaryHomeActivityWhenPrimaryHomeSupportMultiDisplay() {
        // SetUp: set primary home.
        mockResolveHomeActivity(true /* primaryHome */, false /* forceSystemProvided */);
        // SetUp: put primary home info on 2nd item
        final List<ResolveInfo> resolutions = new ArrayList<>();
        final ResolveInfo infoFake1 = new ResolveInfo();
        infoFake1.activityInfo = new ActivityInfo();
        infoFake1.activityInfo.name = "fakeActivity1";
        infoFake1.activityInfo.applicationInfo = new ApplicationInfo();
        infoFake1.activityInfo.applicationInfo.packageName = "fakePackage1";
        final ResolveInfo infoFake2 = new ResolveInfo();
        final ActivityInfo aInfoPrimary = getFakeHomeActivityInfo(true /* primaryHome */);
        infoFake2.activityInfo = aInfoPrimary;
        resolutions.add(infoFake1);
        resolutions.add(infoFake2);
        doReturn(resolutions).when(mRootWindowContainer).resolveActivities(anyInt(), any());

        doReturn(true).when(mRootWindowContainer).canStartHomeOnDisplay(
                any(), anyInt(), anyBoolean());

        // Run the test.
        final Pair<ActivityInfo, Intent> resolvedInfo = mRootWindowContainer
                .resolveSecondaryHomeActivity(0 /* userId */, 1 /* displayId */);
        assertEquals(aInfoPrimary.name, resolvedInfo.first.name);
        assertEquals(aInfoPrimary.applicationInfo.packageName,
                resolvedInfo.first.applicationInfo.packageName);
    }

    /**
     * Tests that the first one that matches should be selected if there are multiple activities.
     */
    @Test
    public void testResolveSecondaryHomeActivityWhenOtherActivitySupportMultiDisplay() {
        // SetUp: set primary home.
        mockResolveHomeActivity(true /* primaryHome */, false /* forceSystemProvided */);
        // Setup: prepare two eligible activity info.
        final List<ResolveInfo> resolutions = new ArrayList<>();
        final ResolveInfo infoFake1 = new ResolveInfo();
        infoFake1.activityInfo = new ActivityInfo();
        infoFake1.activityInfo.name = "fakeActivity1";
        infoFake1.activityInfo.applicationInfo = new ApplicationInfo();
        infoFake1.activityInfo.applicationInfo.packageName = "fakePackage1";
        final ResolveInfo infoFake2 = new ResolveInfo();
        infoFake2.activityInfo = new ActivityInfo();
        infoFake2.activityInfo.name = "fakeActivity2";
        infoFake2.activityInfo.applicationInfo = new ApplicationInfo();
        infoFake2.activityInfo.applicationInfo.packageName = "fakePackage2";
        resolutions.add(infoFake1);
        resolutions.add(infoFake2);
        doReturn(resolutions).when(mRootWindowContainer).resolveActivities(anyInt(), any());

        doReturn(true).when(mRootWindowContainer).canStartHomeOnDisplay(
                any(), anyInt(), anyBoolean());

        // Use the first one of matched activities in the same package as selected primary home.
        final Pair<ActivityInfo, Intent> resolvedInfo = mRootWindowContainer
                .resolveSecondaryHomeActivity(0 /* userId */, 1 /* displayId */);

        assertEquals(infoFake1.activityInfo.applicationInfo.packageName,
                resolvedInfo.first.applicationInfo.packageName);
        assertEquals(infoFake1.activityInfo.name, resolvedInfo.first.name);
    }

    /**
     * Test that {@link RootWindowContainer#getLaunchStack} with the real caller id will get the
     * expected stack when requesting the activity launch on the secondary display.
     */
    @Test
    public void testGetLaunchStackWithRealCallerId() {
        // Create a non-system owned virtual display.
        final TestDisplayContent secondaryDisplay =
                new TestDisplayContent.Builder(mService, 1000, 1500)
                        .setType(TYPE_VIRTUAL).setOwnerUid(100).build();

        // Create an activity with specify the original launch pid / uid.
        final ActivityRecord r = new ActivityBuilder(mService).setLaunchedFromPid(200)
                .setLaunchedFromUid(200).build();

        // Simulate ActivityStarter to find a launch stack for requesting the activity to launch
        // on the secondary display with realCallerId.
        final ActivityOptions options = ActivityOptions.makeBasic();
        options.setLaunchDisplayId(secondaryDisplay.mDisplayId);
        options.setLaunchWindowingMode(WINDOWING_MODE_FULLSCREEN);
        doReturn(true).when(mSupervisor).canPlaceEntityOnDisplay(secondaryDisplay.mDisplayId,
                300 /* test realCallerPid */, 300 /* test realCallerUid */, r.info);
        final ActivityStack result = mRootWindowContainer.getLaunchStack(r, options,
                null /* task */, true /* onTop */, null, 300 /* test realCallerPid */,
                300 /* test realCallerUid */);

        // Assert that the stack is returned as expected.
        assertNotNull(result);
        assertEquals("The display ID of the stack should same as secondary display ",
                secondaryDisplay.mDisplayId, result.getDisplayId());
    }

    @Test
    public void testSwitchUser_missingHomeRootTask() {
        doReturn(mFullscreenStack).when(mRootWindowContainer).getTopDisplayFocusedStack();

        DisplayContent defaultDisplay = mRootWindowContainer.getDefaultDisplay();
        ActivityStack homeStack = defaultDisplay.getRootHomeTask();
        if (homeStack != null) {
            homeStack.removeImmediately();
        }
        assertNull(defaultDisplay.getRootHomeTask());

        int currentUser = mRootWindowContainer.mCurrentUser;
        int otherUser = currentUser + 1;

        mRootWindowContainer.switchUser(otherUser, null);

        assertNotNull(defaultDisplay.getRootHomeTask());
        assertEquals(defaultDisplay.getTopStack(), defaultDisplay.getRootHomeTask());
    }

    /**
     * Mock {@link RootWindowContainer#resolveHomeActivity} for returning consistent activity
     * info for test cases.
     *
     * @param primaryHome Indicate to use primary home intent as parameter, otherwise, use
     *                    secondary home intent.
     * @param forceSystemProvided Indicate to force using system provided home activity.
     */
    private void mockResolveHomeActivity(boolean primaryHome, boolean forceSystemProvided) {
        ActivityInfo targetActivityInfo = getFakeHomeActivityInfo(primaryHome);
        Intent targetIntent;
        if (primaryHome) {
            targetIntent = mService.getHomeIntent();
        } else {
            Resources resources = mContext.getResources();
            spyOn(resources);
            doReturn(targetActivityInfo.applicationInfo.packageName).when(resources).getString(
                    com.android.internal.R.string.config_secondaryHomePackage);
            doReturn(forceSystemProvided).when(resources).getBoolean(
                    com.android.internal.R.bool.config_useSystemProvidedLauncherForSecondary);
            targetIntent = mService.getSecondaryHomeIntent(null /* preferredPackage */);
        }
        doReturn(targetActivityInfo).when(mRootWindowContainer).resolveHomeActivity(anyInt(),
                refEq(targetIntent));
    }

    /**
     * Mock {@link RootWindowContainer#resolveSecondaryHomeActivity} for returning consistent
     * activity info for test cases.
     */
    private void mockResolveSecondaryHomeActivity() {
        final Intent secondaryHomeIntent = mService
                .getSecondaryHomeIntent(null /* preferredPackage */);
        final ActivityInfo aInfoSecondary = getFakeHomeActivityInfo(false);
        doReturn(Pair.create(aInfoSecondary, secondaryHomeIntent)).when(mRootWindowContainer)
                .resolveSecondaryHomeActivity(anyInt(), anyInt());
    }

    private ActivityInfo getFakeHomeActivityInfo(boolean primaryHome) {
        final ActivityInfo aInfo = new ActivityInfo();
        aInfo.name = primaryHome ? "fakeHomeActivity" : "fakeSecondaryHomeActivity";
        aInfo.applicationInfo = new ApplicationInfo();
        aInfo.applicationInfo.packageName =
                primaryHome ? "fakeHomePackage" : "fakeSecondaryHomePackage";
        return  aInfo;
    }
}