1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.internal.policy.impl.keyguard; 18 19 import android.app.ActivityManager; 20 import android.content.Context; 21 import android.os.RemoteException; 22 import android.util.Slog; 23 24 import com.android.internal.policy.IKeyguardService; 25 import com.android.internal.policy.IKeyguardStateCallback; 26 import com.android.internal.widget.LockPatternUtils; 27 28 /** 29 * Maintains a cached copy of Keyguard's state. 30 * @hide 31 */ 32 public class KeyguardStateMonitor extends IKeyguardStateCallback.Stub { 33 private static final String TAG = "KeyguardStateMonitor"; 34 35 // These cache the current state of Keyguard to improve performance and avoid deadlock. After 36 // Keyguard changes its state, it always triggers a layout in window manager. Because 37 // IKeyguardStateCallback is synchronous and because these states are declared volatile, it's 38 // guaranteed that window manager picks up the new state all the time in the layout caused by 39 // the state change of Keyguard. 40 private volatile boolean mIsShowing; 41 private volatile boolean mSimSecure; 42 private volatile boolean mInputRestricted; 43 44 private final LockPatternUtils mLockPatternUtils; 45 46 public KeyguardStateMonitor(Context context, IKeyguardService service) { 47 mLockPatternUtils = new LockPatternUtils(context); 48 mLockPatternUtils.setCurrentUser(ActivityManager.getCurrentUser()); 49 try { 50 service.addStateMonitorCallback(this); 51 } catch (RemoteException e) { 52 Slog.w(TAG, "Remote Exception", e); 53 } 54 } 55 56 public boolean isShowing() { 57 return mIsShowing; 58 } 59 60 public boolean isSecure() { 61 return mLockPatternUtils.isSecure() || mSimSecure; 62 } 63 64 public boolean isInputRestricted() { 65 return mInputRestricted; 66 } 67 68 @Override // Binder interface 69 public void onShowingStateChanged(boolean showing) { 70 mIsShowing = showing; 71 } 72 73 @Override // Binder interface 74 public void onSimSecureStateChanged(boolean simSecure) { 75 mSimSecure = simSecure; 76 } 77 78 public void setCurrentUser(int userId) { 79 mLockPatternUtils.setCurrentUser(userId); 80 } 81 82 @Override // Binder interface 83 public void onInputRestrictedStateChanged(boolean inputRestricted) { 84 mInputRestricted = inputRestricted; 85 } 86 }