| /* |
| * 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.ActivityManager.StackId.INVALID_STACK_ID; |
| import static android.app.StatusBarManager.DISABLE_BACK; |
| import static android.app.StatusBarManager.DISABLE_HOME; |
| import static android.app.StatusBarManager.DISABLE_MASK; |
| import static android.app.StatusBarManager.DISABLE_NONE; |
| import static android.app.StatusBarManager.DISABLE_RECENT; |
| import static android.content.Context.DEVICE_POLICY_SERVICE; |
| import static android.content.Context.STATUS_BAR_SERVICE; |
| import static android.os.UserHandle.USER_ALL; |
| import static android.os.UserHandle.USER_CURRENT; |
| import static android.provider.Settings.Secure.LOCK_TO_APP_EXIT_LOCKED; |
| 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.admin.IDevicePolicyManager; |
| import android.content.Context; |
| 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.util.Slog; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| 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; |
| |
| /** |
| * 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 = DISABLE_MASK |
| & (~DISABLE_BACK); |
| @VisibleForTesting |
| static final int STATUS_BAR_MASK_PINNED = DISABLE_MASK |
| & (~DISABLE_BACK) |
| & (~DISABLE_HOME) |
| & (~DISABLE_RECENT); |
| |
| /** 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; |
| |
| /** |
| * Helper that is responsible for showing the right toast when a disallowed activity operation |
| * occurred. In pinned mode, we show instructions on how to break out of this mode, whilst in |
| * fully locked mode we only show that unlocking is blocked. |
| */ |
| @VisibleForTesting |
| LockTaskNotify mLockTaskNotify; |
| |
| /** |
| * The chain of tasks in lockTask mode. The current frontmost task is at the top, and tasks |
| * may be finished until there is only one entry left. If this is empty the system is not |
| * in lockTask mode. |
| */ |
| private final ArrayList<TaskRecord> mLockTaskModeTasks = new ArrayList<>(); |
| |
| /** |
| * 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; |
| |
| /** |
| * 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 can be moved to the back of the stack. Locked tasks cannot be |
| * moved to the back of the stack. |
| */ |
| boolean checkLockedTask(TaskRecord task) { |
| if (mLockTaskModeTasks.contains(task)) { |
| showLockTaskToast(); |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * @return whether the given activity is blocked from finishing, because it is the root activity |
| * of the last locked task and finishing it would mean that lock task mode is ended illegally. |
| */ |
| boolean activityBlockedFromFinish(ActivityRecord activity) { |
| TaskRecord task = activity.getTask(); |
| if (activity == task.getRootActivity() |
| && task.mLockTaskAuth != LOCK_TASK_AUTH_LAUNCHABLE_PRIV |
| && mLockTaskModeTasks.size() == 1 |
| && mLockTaskModeTasks.contains(task)) { |
| Slog.i(TAG, "Not finishing task in lock task mode"); |
| showLockTaskToast(); |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * @return whether the requested task is allowed 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 allowed to be launched. |
| */ |
| boolean isLockTaskModeViolation(TaskRecord task, boolean isNewClearTask) { |
| if (isLockTaskModeViolationInternal(task, isNewClearTask)) { |
| showLockTaskToast(); |
| return true; |
| } |
| return false; |
| } |
| |
| 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 (getLockedTask() == task && !isNewClearTask) { |
| // If the task is already at the top and won't be cleared, then allow the operation |
| return false; |
| } |
| final int lockTaskAuth = task.mLockTaskAuth; |
| switch (lockTaskAuth) { |
| case LOCK_TASK_AUTH_DONT_LOCK: |
| return !mLockTaskModeTasks.isEmpty(); |
| case LOCK_TASK_AUTH_LAUNCHABLE_PRIV: |
| case LOCK_TASK_AUTH_LAUNCHABLE: |
| case LOCK_TASK_AUTH_WHITELISTED: |
| return false; |
| case LOCK_TASK_AUTH_PINNABLE: |
| // Pinnable tasks can't be launched on top of locktask tasks. |
| return !mLockTaskModeTasks.isEmpty(); |
| default: |
| Slog.w(TAG, "isLockTaskModeViolation: invalid lockTaskAuth value=" + lockTaskAuth); |
| return true; |
| } |
| } |
| |
| /** |
| * Stop the current lock task mode. |
| * |
| * @param isSystemInitiated indicates whether this request was initiated by the system via |
| * {@link ActivityManagerService#stopSystemLockTaskMode()}. |
| * @param callingUid the caller that requested the end of lock task mode. |
| * @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(boolean isSystemInitiated, int callingUid) { |
| final TaskRecord lockTask = getLockedTask(); |
| if (lockTask == null || mLockTaskModeState == LOCK_TASK_MODE_NONE) { |
| // Our work here is done. |
| return; |
| } |
| |
| if (isSystemInitiated && mLockTaskModeState == LOCK_TASK_MODE_LOCKED) { |
| // As system can only start app pinning, we also only let it unlock in this mode. |
| showLockTaskToast(); |
| return; |
| } |
| |
| // 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 (!isSystemInitiated && callingUid != lockTask.mLockTaskUid |
| && (lockTask.mLockTaskUid != 0 || callingUid != lockTask.effectiveUid)) { |
| throw new SecurityException("Invalid uid, expected " + lockTask.mLockTaskUid |
| + " callingUid=" + callingUid + " effectiveUid=" + lockTask.effectiveUid); |
| } |
| |
| clearLockTaskMode("stopLockTask"); |
| } |
| |
| /** |
| * Remove the given task from the locked task list. If this was the last task in the list, |
| * lock task mode is stopped. |
| */ |
| void removeLockedTask(final TaskRecord task) { |
| if (!mLockTaskModeTasks.remove(task)) { |
| return; |
| } |
| if (DEBUG_LOCKTASK) Slog.w(TAG_LOCKTASK, "removeLockedTask: removed " + task); |
| if (mLockTaskModeTasks.isEmpty()) { |
| // Last one. |
| if (DEBUG_LOCKTASK) Slog.d(TAG_LOCKTASK, "removeLockedTask: task=" + task + |
| " last task, reverting locktask mode. Callers=" + Debug.getCallers(3)); |
| mHandler.post(() -> performStopLockTask(task.userId)); |
| } |
| } |
| |
| /** |
| * Remove the topmost task from the locked task list. If this is the last task in the list, it |
| * will result in the end of locked task mode. |
| */ |
| void clearLockTaskMode(String reason) { |
| // Take out of lock task mode if necessary |
| final TaskRecord lockedTask = getLockedTask(); |
| if (lockedTask != null) { |
| removeLockedTask(lockedTask); |
| if (!mLockTaskModeTasks.isEmpty()) { |
| // There are locked tasks remaining, can only finish this task, not unlock it. |
| if (DEBUG_LOCKTASK) Slog.w(TAG_LOCKTASK, |
| "setLockTaskMode: Tasks remaining, can't unlock"); |
| lockedTask.performClearTaskLocked(); |
| mSupervisor.resumeFocusedStackTopActivityLocked(); |
| return; |
| } |
| } |
| if (DEBUG_LOCKTASK) Slog.w(TAG_LOCKTASK, |
| "setLockTaskMode: No tasks to unlock. Callers=" + Debug.getCallers(4)); |
| } |
| |
| // 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 { |
| if (getStatusBarService() != null) { |
| getStatusBarService().disable(DISABLE_NONE, mToken, |
| mContext.getPackageName()); |
| } |
| mWindowManager.reenableKeyguard(mToken); |
| if (getDevicePolicyManager() != null) { |
| getDevicePolicyManager().notifyLockTaskModeChanged(false, null, userId); |
| } |
| getLockTaskNotify().show(false); |
| try { |
| boolean shouldLockKeyguard = Settings.Secure.getIntForUser( |
| mContext.getContentResolver(), |
| LOCK_TO_APP_EXIT_LOCKED, |
| USER_CURRENT) != 0; |
| if (mLockTaskModeState == LOCK_TASK_MODE_PINNED && shouldLockKeyguard) { |
| mWindowManager.lockNow(null); |
| mWindowManager.dismissKeyguard(null /* callback */); |
| getLockPatternUtils().requireCredentialEntry(USER_ALL); |
| } |
| } catch (Settings.SettingNotFoundException e) { |
| // No setting, don't lock. |
| } |
| } catch (RemoteException ex) { |
| throw new RuntimeException(ex); |
| } finally { |
| mLockTaskModeState = LOCK_TASK_MODE_NONE; |
| } |
| } |
| |
| /** |
| * Show the lock task violation toast. |
| */ |
| void showLockTaskToast() { |
| mHandler.post(() -> getLockTaskNotify().showToast(mLockTaskModeState)); |
| } |
| |
| // Starting lock task |
| |
| /** |
| * Method to start lock task mode on a given task. |
| * |
| * @param task the task that should be locked. |
| * @param isSystemInitiated indicates whether this request was initiated by the system via |
| * {@link ActivityManagerService#startSystemLockTaskMode(int)}. |
| * @param callingUid the caller that requested the launch of lock task mode. |
| */ |
| void startLockTaskMode(@NonNull TaskRecord task, boolean isSystemInitiated, |
| int callingUid) { |
| if (!isSystemInitiated) { |
| 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 isSystemInitiated 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, isSystemInitiated ? "Locking pinned" : "Locking fully"); |
| setLockTaskMode(task, isSystemInitiated ? 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; |
| } |
| |
| if (mLockTaskModeTasks.isEmpty()) { |
| // Start lock task on the handler thread |
| mHandler.post(() -> performStartLockTask( |
| task.intent.getComponent().getPackageName(), |
| task.userId, |
| lockTaskModeState)); |
| } |
| |
| // Add it or move it to the top. |
| if (DEBUG_LOCKTASK) Slog.w(TAG_LOCKTASK, "setLockTaskMode: Locking to " + task + |
| " Callers=" + Debug.getCallers(4)); |
| mLockTaskModeTasks.remove(task); |
| mLockTaskModeTasks.add(task); |
| |
| if (task.mLockTaskUid == -1) { |
| task.mLockTaskUid = task.effectiveUid; |
| } |
| |
| if (andResume) { |
| mSupervisor.findTaskToMoveToFrontLocked(task, 0, null, reason, |
| lockTaskModeState != LOCK_TASK_MODE_NONE); |
| mSupervisor.resumeFocusedStackTopActivityLocked(); |
| mWindowManager.executeAppTransition(); |
| } else if (lockTaskModeState != LOCK_TASK_MODE_NONE) { |
| mSupervisor.handleNonResizableTaskIfNeeded(task, INVALID_STACK_ID, DEFAULT_DISPLAY, |
| task.getStackId(), 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 { |
| getLockTaskNotify().show(true); |
| mLockTaskModeState = lockTaskModeState; |
| if (getStatusBarService() != null) { |
| int flags = 0; |
| if (mLockTaskModeState == LOCK_TASK_MODE_LOCKED) { |
| flags = STATUS_BAR_MASK_LOCKED; |
| } else if (mLockTaskModeState == LOCK_TASK_MODE_PINNED) { |
| flags = STATUS_BAR_MASK_PINNED; |
| } |
| getStatusBarService().disable(flags, mToken, mContext.getPackageName()); |
| } |
| mWindowManager.disableKeyguard(mToken, LOCK_TASK_TAG); |
| if (getDevicePolicyManager() != null) { |
| getDevicePolicyManager().notifyLockTaskModeChanged(true, packageName, userId); |
| } |
| } catch (RemoteException ex) { |
| throw new RuntimeException(ex); |
| } |
| } |
| |
| /** |
| * Called when the list of packages whitelisted for lock task mode is changed. Any currently |
| * locked tasks that got removed from the whitelist will be finished. |
| */ |
| // TODO: Missing unit tests |
| void onLockTaskPackagesUpdated() { |
| boolean didSomething = 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 (wasWhitelisted && !isWhitelisted) { |
| // Lost whitelisting authorization. End it now. |
| if (DEBUG_LOCKTASK) Slog.d(TAG_LOCKTASK, "onLockTaskPackagesUpdated: removing " + |
| lockedTask + " mLockTaskAuth()=" + lockedTask.lockTaskAuthToString()); |
| removeLockedTask(lockedTask); |
| lockedTask.performClearTaskLocked(); |
| didSomething = true; |
| } |
| } |
| |
| for (int displayNdx = mSupervisor.getChildCount() - 1; displayNdx >= 0; --displayNdx) { |
| ArrayList<ActivityStack> stacks = mSupervisor.getChildAt(displayNdx).mStacks; |
| for (int stackNdx = stacks.size() - 1; stackNdx >= 0; --stackNdx) { |
| final ActivityStack stack = stacks.get(stackNdx); |
| stack.onLockTaskPackagesUpdatedLocked(); |
| } |
| } |
| 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); |
| didSomething = true; |
| } |
| if (didSomething) { |
| mSupervisor.resumeFocusedStackTopActivityLocked(); |
| } |
| } |
| |
| /** |
| * @return the topmost locked task |
| */ |
| private TaskRecord getLockedTask() { |
| final int top = mLockTaskModeTasks.size() - 1; |
| if (top >= 0) { |
| return mLockTaskModeTasks.get(top); |
| } |
| return null; |
| } |
| |
| // 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; |
| } |
| |
| // Should only be called on the handler thread |
| @NonNull |
| private LockTaskNotify getLockTaskNotify() { |
| if (mLockTaskNotify == null) { |
| mLockTaskNotify = new LockTaskNotify(mContext); |
| } |
| return mLockTaskNotify; |
| } |
| |
| public void dump(PrintWriter pw, String prefix) { |
| pw.print(prefix); pw.print("mLockTaskModeState=" + lockTaskModeToString()); |
| pw.println(" mLockTaskModeTasks" + mLockTaskModeTasks); |
| } |
| |
| 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; |
| } |
| } |
| } |
