/*
* Copyright 2017, 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.am;
import static android.app.ActivityManager.LOCK_TASK_MODE_LOCKED;
import static android.app.ActivityManager.LOCK_TASK_MODE_NONE;
import static android.app.ActivityManager.LOCK_TASK_MODE_PINNED;
import static android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED;
import static android.content.Context.DEVICE_POLICY_SERVICE;
import static android.content.Context.STATUS_BAR_SERVICE;
import static android.content.Intent.ACTION_CALL_EMERGENCY;
import static android.os.UserHandle.USER_ALL;
import static android.os.UserHandle.USER_CURRENT;
import static android.telecom.TelecomManager.EMERGENCY_DIALER_COMPONENT;
import static android.view.Display.DEFAULT_DISPLAY;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_LOCKTASK;
import static com.android.server.am.ActivityManagerDebugConfig.POSTFIX_LOCKTASK;
import static com.android.server.am.ActivityManagerDebugConfig.TAG_AM;
import static com.android.server.am.ActivityManagerDebugConfig.TAG_WITH_CLASS_NAME;
import static com.android.server.am.TaskRecord.LOCK_TASK_AUTH_DONT_LOCK;
import static com.android.server.am.TaskRecord.LOCK_TASK_AUTH_LAUNCHABLE;
import static com.android.server.am.TaskRecord.LOCK_TASK_AUTH_LAUNCHABLE_PRIV;
import static com.android.server.am.TaskRecord.LOCK_TASK_AUTH_PINNABLE;
import static com.android.server.am.TaskRecord.LOCK_TASK_AUTH_WHITELISTED;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.StatusBarManager;
import android.app.admin.DevicePolicyManager;
import android.app.admin.IDevicePolicyManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.os.Binder;
import android.os.Debug;
import android.os.Handler;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.provider.Settings;
import android.telecom.TelecomManager;
import android.util.Pair;
import android.util.Slog;
import android.util.SparseArray;
import android.util.SparseIntArray;
import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.policy.IKeyguardDismissCallback;
import com.android.internal.statusbar.IStatusBarService;
import com.android.internal.widget.LockPatternUtils;
import com.android.server.LocalServices;
import com.android.server.statusbar.StatusBarManagerInternal;
import com.android.server.wm.WindowManagerService;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
/**
* Helper class that deals with all things related to task locking. This includes the screen pinning
* mode that can be launched via System UI as well as the fully locked mode that can be achieved
* on fully managed devices.
*
* Note: All methods in this class should only be called with the ActivityManagerService lock held.
*
* @see Activity#startLockTask()
* @see Activity#stopLockTask()
*/
public class LockTaskController {
private static final String TAG = TAG_WITH_CLASS_NAME ? "LockTaskController" : TAG_AM;
private static final String TAG_LOCKTASK = TAG + POSTFIX_LOCKTASK;
@VisibleForTesting
static final int STATUS_BAR_MASK_LOCKED = StatusBarManager.DISABLE_MASK
& (~StatusBarManager.DISABLE_EXPAND)
& (~StatusBarManager.DISABLE_NOTIFICATION_TICKER)
& (~StatusBarManager.DISABLE_SYSTEM_INFO)
& (~StatusBarManager.DISABLE_BACK);
@VisibleForTesting
static final int STATUS_BAR_MASK_PINNED = StatusBarManager.DISABLE_MASK
& (~StatusBarManager.DISABLE_BACK)
& (~StatusBarManager.DISABLE_HOME)
& (~StatusBarManager.DISABLE_RECENT);
private static final SparseArray<Pair<Integer, Integer>> STATUS_BAR_FLAG_MAP_LOCKED;
static {
STATUS_BAR_FLAG_MAP_LOCKED = new SparseArray<>();
STATUS_BAR_FLAG_MAP_LOCKED.append(DevicePolicyManager.LOCK_TASK_FEATURE_SYSTEM_INFO,
new Pair<>(StatusBarManager.DISABLE_CLOCK, StatusBarManager.DISABLE2_SYSTEM_ICONS));
STATUS_BAR_FLAG_MAP_LOCKED.append(DevicePolicyManager.LOCK_TASK_FEATURE_NOTIFICATIONS,
new Pair<>(StatusBarManager.DISABLE_NOTIFICATION_ICONS
| StatusBarManager.DISABLE_NOTIFICATION_ALERTS,
StatusBarManager.DISABLE2_NOTIFICATION_SHADE));
STATUS_BAR_FLAG_MAP_LOCKED.append(DevicePolicyManager.LOCK_TASK_FEATURE_HOME,
new Pair<>(StatusBarManager.DISABLE_HOME, StatusBarManager.DISABLE2_NONE));
STATUS_BAR_FLAG_MAP_LOCKED.append(DevicePolicyManager.LOCK_TASK_FEATURE_OVERVIEW,
new Pair<>(StatusBarManager.DISABLE_RECENT, StatusBarManager.DISABLE2_NONE));
STATUS_BAR_FLAG_MAP_LOCKED.append(DevicePolicyManager.LOCK_TASK_FEATURE_GLOBAL_ACTIONS,
new Pair<>(StatusBarManager.DISABLE_NONE,
StatusBarManager.DISABLE2_GLOBAL_ACTIONS));
}
/** Tag used for disabling of keyguard */
private static final String LOCK_TASK_TAG = "Lock-to-App";
private final IBinder mToken = new Binder();
private final ActivityStackSupervisor mSupervisor;
private final Context mContext;
// The following system services cannot be final, because they do not exist when this class
// is instantiated during device boot
@VisibleForTesting
IStatusBarService mStatusBarService;
@VisibleForTesting
IDevicePolicyManager mDevicePolicyManager;
@VisibleForTesting
WindowManagerService mWindowManager;
@VisibleForTesting
LockPatternUtils mLockPatternUtils;
@VisibleForTesting
TelecomManager mTelecomManager;
/**
* The chain of tasks in LockTask mode, in the order of when they first entered LockTask mode.
*
* The first task in the list, which started the current LockTask session, is called the root
* task. It coincides with the Home task in a typical multi-app kiosk deployment. When there are
* more than one locked tasks, the root task can't be finished. Nor can it be moved to the back
* of the stack by {@link ActivityStack#moveTaskToBackLocked(int)};
*
* Calling {@link Activity#stopLockTask()} on the root task will finish all tasks but itself in
* this list, and the device will exit LockTask mode.
*
* The list is empty if LockTask is inactive.
*/
private final ArrayList<TaskRecord> mLockTaskModeTasks = new ArrayList<>();
/**
* Packages that are allowed to be launched into the lock task mode for each user.
*/
private final SparseArray<String[]> mLockTaskPackages = new SparseArray<>();
/**
* Features that are allowed by DPC to show during LockTask mode.
*/
private final SparseIntArray mLockTaskFeatures = new SparseIntArray();
/**
* Store the current lock task mode. Possible values:
* {@link ActivityManager#LOCK_TASK_MODE_NONE}, {@link ActivityManager#LOCK_TASK_MODE_LOCKED},
* {@link ActivityManager#LOCK_TASK_MODE_PINNED}
*/
private int mLockTaskModeState = LOCK_TASK_MODE_NONE;
/**
* This is ActivityStackSupervisor's Handler.
*/
private final Handler mHandler;
LockTaskController(Context context, ActivityStackSupervisor supervisor,
Handler handler) {
mContext = context;
mSupervisor = supervisor;
mHandler = handler;
}
/**
* Set the window manager instance used in this class. This is necessary, because the window
* manager does not exist during instantiation of this class.
*/
void setWindowManager(WindowManagerService windowManager) {
mWindowManager = windowManager;
}
/**
* @return the current lock task state. This can be any of
* {@link ActivityManager#LOCK_TASK_MODE_NONE}, {@link ActivityManager#LOCK_TASK_MODE_LOCKED},
* {@link ActivityManager#LOCK_TASK_MODE_PINNED}.
*/
int getLockTaskModeState() {
return mLockTaskModeState;
}
/**
* @return whether the given task is locked at the moment. Locked tasks cannot be moved to the
* back of the stack.
*/
@VisibleForTesting
boolean isTaskLocked(TaskRecord task) {
return mLockTaskModeTasks.contains(task);
}
/**
* @return {@code true} whether this task first started the current LockTask session.
*/
private boolean isRootTask(TaskRecord task) {
return mLockTaskModeTasks.indexOf(task) == 0;
}
/**
* @return whether the given activity is blocked from finishing, because it is the only activity
* of the last locked task and finishing it would mean that lock task mode is ended illegally.
*/
boolean activityBlockedFromFinish(ActivityRecord activity) {
final TaskRecord task = activity.getTask();
if (activity == task.getRootActivity()
&& activity == task.getTopActivity()
&& task.mLockTaskAuth != LOCK_TASK_AUTH_LAUNCHABLE_PRIV
&& isRootTask(task)) {
Slog.i(TAG, "Not finishing task in lock task mode");
showLockTaskToast();
return true;
}
return false;
}
/**
* @return whether the given task can be moved to the back of the stack with
* {@link ActivityStack#moveTaskToBackLocked(int)}
* @see #mLockTaskModeTasks
*/
boolean canMoveTaskToBack(TaskRecord task) {
if (isRootTask(task)) {
showLockTaskToast();
return false;
}
return true;
}
/**
* @return whether the requested task is allowed to be locked (either whitelisted, or declares
* lockTaskMode="always" in the manifest).
*/
boolean isTaskWhitelisted(TaskRecord task) {
switch(task.mLockTaskAuth) {
case LOCK_TASK_AUTH_WHITELISTED:
case LOCK_TASK_AUTH_LAUNCHABLE:
case LOCK_TASK_AUTH_LAUNCHABLE_PRIV:
return true;
case LOCK_TASK_AUTH_PINNABLE:
case LOCK_TASK_AUTH_DONT_LOCK:
default:
return false;
}
}
/**
* @return whether the requested task is disallowed to be launched.
*/
boolean isLockTaskModeViolation(TaskRecord task) {
return isLockTaskModeViolation(task, false);
}
/**
* @param isNewClearTask whether the task would be cleared as part of the operation.
* @return whether the requested task is disallowed to be launched.
*/
boolean isLockTaskModeViolation(TaskRecord task, boolean isNewClearTask) {
if (isLockTaskModeViolationInternal(task, isNewClearTask)) {
showLockTaskToast();
return true;
}
return false;
}
/**
* @return the root task of the lock task.
*/
TaskRecord getRootTask() {
if (mLockTaskModeTasks.isEmpty()) {
return null;
}
return mLockTaskModeTasks.get(0);
}
private boolean isLockTaskModeViolationInternal(TaskRecord task, boolean isNewClearTask) {
// TODO: Double check what's going on here. If the task is already in lock task mode, it's
// likely whitelisted, so will return false below.
if (isTaskLocked(task) && !isNewClearTask) {
// If the task is already at the top and won't be cleared, then allow the operation
return false;
}
// Allow recents activity if enabled by policy
if (task.isActivityTypeRecents() && isRecentsAllowed(task.userId)) {
return false;
}
// Allow emergency calling when the device is protected by a locked keyguard
if (isKeyguardAllowed(task.userId) && isEmergencyCallTask(task)) {
return false;
}
return !(isTaskWhitelisted(task) || mLockTaskModeTasks.isEmpty());
}
private boolean isRecentsAllowed(int userId) {
return (getLockTaskFeaturesForUser(userId)
& DevicePolicyManager.LOCK_TASK_FEATURE_OVERVIEW) != 0;
}
private boolean isKeyguardAllowed(int userId) {
return (getLockTaskFeaturesForUser(userId)
& DevicePolicyManager.LOCK_TASK_FEATURE_KEYGUARD) != 0;
}
private boolean isEmergencyCallTask(TaskRecord task) {
final Intent intent = task.intent;
if (intent == null) {
return false;
}
// 1. The emergency keypad activity launched on top of the keyguard
if (EMERGENCY_DIALER_COMPONENT.equals(intent.getComponent())) {
return true;
}
// 2. The intent sent by the keypad, which is handled by Telephony
if (ACTION_CALL_EMERGENCY.equals(intent.getAction())) {
return true;
}
// 3. Telephony then starts the default package for making the call
final TelecomManager tm = getTelecomManager();
final String dialerPackage = tm != null ? tm.getSystemDialerPackage() : null;
if (dialerPackage != null && dialerPackage.equals(intent.getComponent().getPackageName())) {
return true;
}
return false;
}
/**
* Stop the current lock task mode.
*
* This is called by {@link ActivityManagerService} and performs various checks before actually
* finishing the locked task.
*
* @param task the task that requested the end of lock task mode ({@code null} for quitting app
* pinning mode)
* @param isSystemCaller indicates whether this request comes from the system via
* {@link ActivityManagerService#stopSystemLockTaskMode()}. If
* {@code true}, it means the user intends to stop pinned mode through UI;
* otherwise, it's called by an app and we need to stop locked or pinned
* mode, subject to checks.
* @param callingUid the caller that requested the end of lock task mode.
* @throws IllegalArgumentException if the calling task is invalid (e.g., {@code null} or not in
* foreground)
* @throws SecurityException if the caller is not authorized to stop the lock task mode, i.e. if
* they differ from the one that launched lock task mode.
*/
void stopLockTaskMode(@Nullable TaskRecord task, boolean isSystemCaller, int callingUid) {
if (mLockTaskModeState == LOCK_TASK_MODE_NONE) {
return;
}
if (isSystemCaller) {
if (mLockTaskModeState == LOCK_TASK_MODE_PINNED) {
clearLockedTasks("stopAppPinning");
} else {
Slog.e(TAG_LOCKTASK, "Attempted to stop LockTask with isSystemCaller=true");
showLockTaskToast();
}
} else {
// Ensure calling activity is not null
if (task == null) {
throw new IllegalArgumentException("can't stop LockTask for null task");
}
// Ensure the same caller for startLockTaskMode and stopLockTaskMode.
// It is possible lockTaskMode was started by the system process because
// android:lockTaskMode is set to a locking value in the application manifest
// instead of the app calling startLockTaskMode. In this case
// {@link TaskRecord.mLockTaskUid} will be 0, so we compare the callingUid to the
// {@link TaskRecord.effectiveUid} instead. Also caller with
// {@link MANAGE_ACTIVITY_STACKS} can stop any lock task.
if (callingUid != task.mLockTaskUid
&& (task.mLockTaskUid != 0 || callingUid != task.effectiveUid)) {
throw new SecurityException("Invalid uid, expected " + task.mLockTaskUid
+ " callingUid=" + callingUid + " effectiveUid=" + task.effectiveUid);
}
// We don't care if it's pinned or locked mode; this will stop it anyways.
clearLockedTask(task);
}
}
/**
* Clear all locked tasks and request the end of LockTask mode.
*
* This method is called by {@link UserController} when starting a new foreground user, and,
* unlike {@link #stopLockTaskMode(TaskRecord, boolean, int)}, it doesn't perform the checks.
*/
void clearLockedTasks(String reason) {
if (DEBUG_LOCKTASK) Slog.i(TAG_LOCKTASK, "clearLockedTasks: " + reason);
if (!mLockTaskModeTasks.isEmpty()) {
clearLockedTask(mLockTaskModeTasks.get(0));
}
}
/**
* Clear one locked task from LockTask mode.
*
* If the requested task is the root task (see {@link #mLockTaskModeTasks}), then all locked
* tasks are cleared. Otherwise, only the requested task is cleared. LockTask mode is stopped
* when the last locked task is cleared.
*
* @param task the task to be cleared from LockTask mode.
*/
void clearLockedTask(final TaskRecord task) {
if (task == null || mLockTaskModeTasks.isEmpty()) return;
if (task == mLockTaskModeTasks.get(0)) {
// We're removing the root task while there are other locked tasks. Therefore we should
// clear all locked tasks in reverse order.
for (int taskNdx = mLockTaskModeTasks.size() - 1; taskNdx > 0; --taskNdx) {
clearLockedTask(mLockTaskModeTasks.get(taskNdx));
}
}
removeLockedTask(task);
if (mLockTaskModeTasks.isEmpty()) {
return;
}
task.performClearTaskLocked();
mSupervisor.resumeFocusedStackTopActivityLocked();
}
/**
* Remove the given task from the locked task list. If this was the last task in the list,
* lock task mode is stopped.
*/
private void removeLockedTask(final TaskRecord task) {
if (!mLockTaskModeTasks.remove(task)) {
return;
}
if (DEBUG_LOCKTASK) Slog.d(TAG_LOCKTASK, "removeLockedTask: removed " + task);
if (mLockTaskModeTasks.isEmpty()) {
if (DEBUG_LOCKTASK) Slog.d(TAG_LOCKTASK, "removeLockedTask: task=" + task +
" last task, reverting locktask mode. Callers=" + Debug.getCallers(3));
mHandler.post(() -> performStopLockTask(task.userId));
}
}
// This method should only be called on the handler thread
private void performStopLockTask(int userId) {
// When lock task ends, we enable the status bars.
try {
setStatusBarState(LOCK_TASK_MODE_NONE, userId);
setKeyguardState(LOCK_TASK_MODE_NONE, userId);
if (mLockTaskModeState == LOCK_TASK_MODE_PINNED) {
lockKeyguardIfNeeded();
}
if (getDevicePolicyManager() != null) {
getDevicePolicyManager().notifyLockTaskModeChanged(false, null, userId);
}
if (mLockTaskModeState == LOCK_TASK_MODE_PINNED) {
getStatusBarService().showPinningEnterExitToast(false /* entering */);
}
mWindowManager.onLockTaskStateChanged(LOCK_TASK_MODE_NONE);
} catch (RemoteException ex) {
throw new RuntimeException(ex);
} finally {
mLockTaskModeState = LOCK_TASK_MODE_NONE;
}
}
/**
* Show the lock task violation toast. Currently we only show toast for screen pinning mode, and
* no-op if the device is in locked mode.
*/
void showLockTaskToast() {
if (mLockTaskModeState == LOCK_TASK_MODE_PINNED) {
try {
getStatusBarService().showPinningEscapeToast();
} catch (RemoteException e) {
Slog.e(TAG, "Failed to send pinning escape toast", e);
}
}
}
// Starting lock task
/**
* Method to start lock task mode on a given task.
*
* @param task the task that should be locked.
* @param isSystemCaller indicates whether this request was initiated by the system via
* {@link ActivityManagerService#startSystemLockTaskMode(int)}. If
* {@code true}, this intends to start pinned mode; otherwise, we look
* at the calling task's mLockTaskAuth to decide which mode to start.
* @param callingUid the caller that requested the launch of lock task mode.
*/
void startLockTaskMode(@NonNull TaskRecord task, boolean isSystemCaller, int callingUid) {
if (!isSystemCaller) {
task.mLockTaskUid = callingUid;
if (task.mLockTaskAuth == LOCK_TASK_AUTH_PINNABLE) {
// startLockTask() called by app, but app is not part of lock task whitelist. Show
// app pinning request. We will come back here with isSystemCaller true.
if (DEBUG_LOCKTASK) Slog.w(TAG_LOCKTASK, "Mode default, asking user");
StatusBarManagerInternal statusBarManager = LocalServices.getService(
StatusBarManagerInternal.class);
if (statusBarManager != null) {
statusBarManager.showScreenPinningRequest(task.taskId);
}
return;
}
}
// System can only initiate screen pinning, not full lock task mode
if (DEBUG_LOCKTASK) Slog.w(TAG_LOCKTASK,
isSystemCaller ? "Locking pinned" : "Locking fully");
setLockTaskMode(task, isSystemCaller ? LOCK_TASK_MODE_PINNED : LOCK_TASK_MODE_LOCKED,
"startLockTask", true);
}
/**
* Start lock task mode on the given task.
* @param lockTaskModeState whether fully locked or pinned mode.
* @param andResume whether the task should be brought to foreground as part of the operation.
*/
private void setLockTaskMode(@NonNull TaskRecord task, int lockTaskModeState,
String reason, boolean andResume) {
// Should have already been checked, but do it again.
if (task.mLockTaskAuth == LOCK_TASK_AUTH_DONT_LOCK) {
if (DEBUG_LOCKTASK) Slog.w(TAG_LOCKTASK,
"setLockTaskMode: Can't lock due to auth");
return;
}
if (isLockTaskModeViolation(task)) {
Slog.e(TAG_LOCKTASK, "setLockTaskMode: Attempt to start an unauthorized lock task.");
return;
}
final Intent taskIntent = task.intent;
if (mLockTaskModeTasks.isEmpty() && taskIntent != null) {
mSupervisor.mRecentTasks.onLockTaskModeStateChanged(lockTaskModeState, task.userId);
// Start lock task on the handler thread
mHandler.post(() -> performStartLockTask(
taskIntent.getComponent().getPackageName(),
task.userId,
lockTaskModeState));
}
if (DEBUG_LOCKTASK) Slog.w(TAG_LOCKTASK, "setLockTaskMode: Locking to " + task +
" Callers=" + Debug.getCallers(4));
if (!mLockTaskModeTasks.contains(task)) {
mLockTaskModeTasks.add(task);
}
if (task.mLockTaskUid == -1) {
task.mLockTaskUid = task.effectiveUid;
}
if (andResume) {
mSupervisor.findTaskToMoveToFront(task, 0, null, reason,
lockTaskModeState != LOCK_TASK_MODE_NONE);
mSupervisor.resumeFocusedStackTopActivityLocked();
mWindowManager.executeAppTransition();
} else if (lockTaskModeState != LOCK_TASK_MODE_NONE) {
mSupervisor.handleNonResizableTaskIfNeeded(task, WINDOWING_MODE_UNDEFINED,
DEFAULT_DISPLAY, task.getStack(), true /* forceNonResizable */);
}
}
// This method should only be called on the handler thread
private void performStartLockTask(String packageName, int userId, int lockTaskModeState) {
// When lock task starts, we disable the status bars.
try {
if (lockTaskModeState == LOCK_TASK_MODE_PINNED) {
getStatusBarService().showPinningEnterExitToast(true /* entering */);
}
mWindowManager.onLockTaskStateChanged(lockTaskModeState);
mLockTaskModeState = lockTaskModeState;
setStatusBarState(lockTaskModeState, userId);
setKeyguardState(lockTaskModeState, userId);
if (getDevicePolicyManager() != null) {
getDevicePolicyManager().notifyLockTaskModeChanged(true, packageName, userId);
}
} catch (RemoteException ex) {
throw new RuntimeException(ex);
}
}
/**
* Update packages that are allowed to be launched in lock task mode.
* @param userId Which user this whitelist is associated with
* @param packages The whitelist of packages allowed in lock task mode
* @see #mLockTaskPackages
*/
void updateLockTaskPackages(int userId, String[] packages) {
mLockTaskPackages.put(userId, packages);
boolean taskChanged = false;
for (int taskNdx = mLockTaskModeTasks.size() - 1; taskNdx >= 0; --taskNdx) {
final TaskRecord lockedTask = mLockTaskModeTasks.get(taskNdx);
final boolean wasWhitelisted = lockedTask.mLockTaskAuth == LOCK_TASK_AUTH_LAUNCHABLE
|| lockedTask.mLockTaskAuth == LOCK_TASK_AUTH_WHITELISTED;
lockedTask.setLockTaskAuth();
final boolean isWhitelisted = lockedTask.mLockTaskAuth == LOCK_TASK_AUTH_LAUNCHABLE
|| lockedTask.mLockTaskAuth == LOCK_TASK_AUTH_WHITELISTED;
if (mLockTaskModeState != LOCK_TASK_MODE_LOCKED
|| lockedTask.userId != userId
|| !wasWhitelisted || isWhitelisted) {
continue;
}
// Terminate locked tasks that have recently lost whitelist authorization.
if (DEBUG_LOCKTASK) Slog.d(TAG_LOCKTASK, "onLockTaskPackagesUpdated: removing " +
lockedTask + " mLockTaskAuth()=" + lockedTask.lockTaskAuthToString());
removeLockedTask(lockedTask);
lockedTask.performClearTaskLocked();
taskChanged = true;
}
for (int displayNdx = mSupervisor.getChildCount() - 1; displayNdx >= 0; --displayNdx) {
mSupervisor.getChildAt(displayNdx).onLockTaskPackagesUpdated();
}
final ActivityRecord r = mSupervisor.topRunningActivityLocked();
final TaskRecord task = (r != null) ? r.getTask() : null;
if (mLockTaskModeTasks.isEmpty() && task!= null
&& task.mLockTaskAuth == LOCK_TASK_AUTH_LAUNCHABLE) {
// This task must have just been authorized.
if (DEBUG_LOCKTASK) Slog.d(TAG_LOCKTASK,
"onLockTaskPackagesUpdated: starting new locktask task=" + task);
setLockTaskMode(task, LOCK_TASK_MODE_LOCKED, "package updated", false);
taskChanged = true;
}
if (taskChanged) {
mSupervisor.resumeFocusedStackTopActivityLocked();
}
}
boolean isPackageWhitelisted(int userId, String pkg) {
if (pkg == null) {
return false;
}
String[] whitelist;
whitelist = mLockTaskPackages.get(userId);
if (whitelist == null) {
return false;
}
for (String whitelistedPkg : whitelist) {
if (pkg.equals(whitelistedPkg)) {
return true;
}
}
return false;
}
/**
* Update the UI features that are enabled for LockTask mode.
* @param userId Which user these feature flags are associated with
* @param flags Bitfield of feature flags
* @see DevicePolicyManager#setLockTaskFeatures(ComponentName, int)
*/
void updateLockTaskFeatures(int userId, int flags) {
int oldFlags = getLockTaskFeaturesForUser(userId);
if (flags == oldFlags) {
return;
}
mLockTaskFeatures.put(userId, flags);
if (!mLockTaskModeTasks.isEmpty() && userId == mLockTaskModeTasks.get(0).userId) {
mHandler.post(() -> {
if (mLockTaskModeState == LOCK_TASK_MODE_LOCKED) {
setStatusBarState(mLockTaskModeState, userId);
setKeyguardState(mLockTaskModeState, userId);
}
});
}
}
/**
* Helper method for configuring the status bar disabled state.
* Should only be called on the handler thread to avoid race.
*/
private void setStatusBarState(int lockTaskModeState, int userId) {
IStatusBarService statusBar = getStatusBarService();
if (statusBar == null) {
Slog.e(TAG, "Can't find StatusBarService");
return;
}
// Default state, when lockTaskModeState == LOCK_TASK_MODE_NONE
int flags1 = StatusBarManager.DISABLE_NONE;
int flags2 = StatusBarManager.DISABLE2_NONE;
if (lockTaskModeState == LOCK_TASK_MODE_PINNED) {
flags1 = STATUS_BAR_MASK_PINNED;
} else if (lockTaskModeState == LOCK_TASK_MODE_LOCKED) {
int lockTaskFeatures = getLockTaskFeaturesForUser(userId);
Pair<Integer, Integer> statusBarFlags = getStatusBarDisableFlags(lockTaskFeatures);
flags1 = statusBarFlags.first;
flags2 = statusBarFlags.second;
}
try {
statusBar.disable(flags1, mToken, mContext.getPackageName());
statusBar.disable2(flags2, mToken, mContext.getPackageName());
} catch (RemoteException e) {
Slog.e(TAG, "Failed to set status bar flags", e);
}
}
/**
* Helper method for configuring the keyguard disabled state.
* Should only be called on the handler thread to avoid race.
*/
private void setKeyguardState(int lockTaskModeState, int userId) {
if (lockTaskModeState == LOCK_TASK_MODE_NONE) {
mWindowManager.reenableKeyguard(mToken);
} else if (lockTaskModeState == LOCK_TASK_MODE_LOCKED) {
if (isKeyguardAllowed(userId)) {
mWindowManager.reenableKeyguard(mToken);
} else {
// If keyguard is not secure and it is locked, dismiss the keyguard before
// disabling it, which avoids the platform to think the keyguard is still on.
if (mWindowManager.isKeyguardLocked() && !mWindowManager.isKeyguardSecure()) {
mWindowManager.dismissKeyguard(new IKeyguardDismissCallback.Stub() {
@Override
public void onDismissError() throws RemoteException {
Slog.i(TAG, "setKeyguardState: failed to dismiss keyguard");
}
@Override
public void onDismissSucceeded() throws RemoteException {
mHandler.post(
() -> mWindowManager.disableKeyguard(mToken, LOCK_TASK_TAG));
}
@Override
public void onDismissCancelled() throws RemoteException {
Slog.i(TAG, "setKeyguardState: dismiss cancelled");
}
}, null);
} else {
mWindowManager.disableKeyguard(mToken, LOCK_TASK_TAG);
}
}
} else { // lockTaskModeState == LOCK_TASK_MODE_PINNED
mWindowManager.disableKeyguard(mToken, LOCK_TASK_TAG);
}
}
/**
* Helper method for locking the device immediately. This may be necessary when the device
* leaves the pinned mode.
*/
private void lockKeyguardIfNeeded() {
try {
boolean shouldLockKeyguard = Settings.Secure.getIntForUser(
mContext.getContentResolver(),
Settings.Secure.LOCK_TO_APP_EXIT_LOCKED,
USER_CURRENT) != 0;
if (shouldLockKeyguard) {
mWindowManager.lockNow(null);
mWindowManager.dismissKeyguard(null /* callback */, null /* message */);
getLockPatternUtils().requireCredentialEntry(USER_ALL);
}
} catch (Settings.SettingNotFoundException e) {
// No setting, don't lock.
}
}
/**
* Translates from LockTask feature flags to StatusBarManager disable and disable2 flags.
* @param lockTaskFlags Bitfield of flags as per
* {@link DevicePolicyManager#setLockTaskFeatures(ComponentName, int)}
* @return A {@link Pair} of {@link StatusBarManager#disable(int)} and
* {@link StatusBarManager#disable2(int)} flags
*/
@VisibleForTesting
Pair<Integer, Integer> getStatusBarDisableFlags(int lockTaskFlags) {
// Everything is disabled by default
int flags1 = StatusBarManager.DISABLE_MASK;
int flags2 = StatusBarManager.DISABLE2_MASK;
for (int i = STATUS_BAR_FLAG_MAP_LOCKED.size() - 1; i >= 0; i--) {
Pair<Integer, Integer> statusBarFlags = STATUS_BAR_FLAG_MAP_LOCKED.valueAt(i);
if ((STATUS_BAR_FLAG_MAP_LOCKED.keyAt(i) & lockTaskFlags) != 0) {
flags1 &= ~statusBarFlags.first;
flags2 &= ~statusBarFlags.second;
}
}
// Some flags are not used for LockTask purposes, so we mask them
flags1 &= STATUS_BAR_MASK_LOCKED;
return new Pair<>(flags1, flags2);
}
/**
* Gets the cached value of LockTask feature flags for a specific user.
*/
private int getLockTaskFeaturesForUser(int userId) {
return mLockTaskFeatures.get(userId, DevicePolicyManager.LOCK_TASK_FEATURE_NONE);
}
// Should only be called on the handler thread
@Nullable
private IStatusBarService getStatusBarService() {
if (mStatusBarService == null) {
mStatusBarService = IStatusBarService.Stub.asInterface(
ServiceManager.checkService(STATUS_BAR_SERVICE));
if (mStatusBarService == null) {
Slog.w("StatusBarManager", "warning: no STATUS_BAR_SERVICE");
}
}
return mStatusBarService;
}
// Should only be called on the handler thread
@Nullable
private IDevicePolicyManager getDevicePolicyManager() {
if (mDevicePolicyManager == null) {
mDevicePolicyManager = IDevicePolicyManager.Stub.asInterface(
ServiceManager.checkService(DEVICE_POLICY_SERVICE));
if (mDevicePolicyManager == null) {
Slog.w(TAG, "warning: no DEVICE_POLICY_SERVICE");
}
}
return mDevicePolicyManager;
}
@NonNull
private LockPatternUtils getLockPatternUtils() {
if (mLockPatternUtils == null) {
// We don't preserve the LPU object to save memory
return new LockPatternUtils(mContext);
}
return mLockPatternUtils;
}
@Nullable
private TelecomManager getTelecomManager() {
if (mTelecomManager == null) {
// We don't preserve the TelecomManager object to save memory
return mContext.getSystemService(TelecomManager.class);
}
return mTelecomManager;
}
public void dump(PrintWriter pw, String prefix) {
pw.println(prefix + "LockTaskController");
prefix = prefix + " ";
pw.println(prefix + "mLockTaskModeState=" + lockTaskModeToString());
pw.println(prefix + "mLockTaskModeTasks=");
for (int i = 0; i < mLockTaskModeTasks.size(); ++i) {
pw.println(prefix + " #" + i + " " + mLockTaskModeTasks.get(i));
}
pw.println(prefix + "mLockTaskPackages (userId:packages)=");
for (int i = 0; i < mLockTaskPackages.size(); ++i) {
pw.println(prefix + " u" + mLockTaskPackages.keyAt(i)
+ ":" + Arrays.toString(mLockTaskPackages.valueAt(i)));
}
}
private String lockTaskModeToString() {
switch (mLockTaskModeState) {
case LOCK_TASK_MODE_LOCKED:
return "LOCKED";
case LOCK_TASK_MODE_PINNED:
return "PINNED";
case LOCK_TASK_MODE_NONE:
return "NONE";
default: return "unknown=" + mLockTaskModeState;
}
}
}