记录了系统锁屏控制的代码片段, 可以从比较高的层次进行锁屏控制。
各种上层接口会调用到KeyguardViewMediator::doKeyguardLocked()进行锁屏。Mediator设计模式？
In doKeyguardLocked()@KeyguardViewMediator.java
It can be seen that if system reboots abnormally, and nothing disable the screen lock, and sim card sits there, the first lock screen will be ignored.
650 private void KeyguardViewMediator::doKeyguardLocked() {
651 // if another app is disabling us, don't show
652 if (!mExternallyEnabled) {
653 if (DEBUG) Log.d(TAG, "doKeyguard: not showing because externally disabled");
654
655 // note: we *should* set mNeedToReshowWhenReenabled=true here, but that makes
656 // for an occasional ugly flicker in this situation:
657 // 1) receive a call with the screen on (no keyguard) or make a call
658 // 2) screen times out
659 // 3) user hits key to turn screen back on
660 // instead, we reenable the keyguard when we know the screen is off and the call
661 // ends (see the broadcast receiver below)
662 // TODO: clean this up when we have better support at the window manager level
663 // for apps that wish to be on top of the keyguard
664 return;
665 }
666
667 // if the keyguard is already showing, don't bother
668 if (mKeyguardViewManager.isShowing()) {
669 if (DEBUG) Log.d(TAG, "doKeyguard: not showing because it is already showing");
670 return;
671 }
672
673 // if the setup wizard hasn't run yet, don't show
674 final boolean provisioned = mUpdateMonitor.isDeviceProvisioned();
675 final IccCard.State[] state;
676 int numPhones = TelephonyManager.getDefault().getPhoneCount();
677 state = new IccCard.State[numPhones];
678 boolean lockedOrMissing = false;
679 boolean isPinLockedFlag = false;
680 for (int i = 0; i < numPhones; i++) {
681 state[i] = mUpdateMonitor.getSimState(i);
682 lockedOrMissing = lockedOrMissing || isLockedOrMissing(state[i]);
683 isPinLockedFlag = isPinLockedFlag || isPinLockedFun(state[i]);
684 if (lockedOrMissing) break;
685 }
686
687 if (!lockedOrMissing && !provisioned) {
688 if (DEBUG) Log.d(TAG, "doKeyguard: not showing because device isn't provisioned"
689 + " and the sim is not locked or missing");
690 return;
691 }
692
693 if (mLockPatternUtils.isLockScreenDisabled() && !lockedOrMissing) {
694 if (DEBUG) Log.d(TAG, "doKeyguard: not showing because lockscreen is off");
695 return;
696 }
697
698
699 mySingleton obj = mySingleton.getInstance();
700 if (obj.isAbnormalBootup()) {
701 if(obj.getAbnormal()==0)// avoid 1st abnormal screenLock
702 {
703 obj.addAbnormal();// set to true
704 Log.d(TAG, "KeyGuardViewMediator.java doKeyguardLocked() obj.getAbnormal()="+obj.getAbnormal());
705 return ;
706 }
707
708 // abnormal reboot and PIN_REQUIRED will not show Locked screen , if pin pass , isPinLockedFlag turn false , will unlock this "if()"
709 if(isPinLockedFlag && obj.getAbnormal()==1){
710 obj.addAbnormal();// set to true
711 Log.d(TAG, "KeyGuardViewMediator.java doKeyguardLocked() obj.getAbnormal()="+obj.getAbnormal());
712 return;
713 }
714 Log.d(TAG, "Showing the lock screen");
715 }
716
717
718 if (DEBUG) Log.d(TAG, "doKeyguard: showing the lock screen");
719 showLocked();
720 }
calls ==>
798 /**
799 * Send message to keyguard telling it to show itself
800 * @see #handleShow()
801 */
802 private void showLocked() {
803 if (DEBUG) Log.d(TAG, "showLocked");
804 // ensure we stay awake until we are finished displaying the keyguard
805 mShowKeyguardWakeLock.acquire();
806 Message msg = mHandler.obtainMessage(SHOW);
807 mHandler.sendMessage(msg);
808 }
message handler |=>
1104 /**
1105 * This handler will be associated with the policy thread, which will also
1106 * be the UI thread of the keyguard. Since the apis of the policy, and therefore
1107 * this class, can be called by other threads, any action that directly
1108 * interacts with the keyguard ui should be posted to this handler, rather
1109 * than called directly.
1110 */
1111 private Handler mHandler = new Handler() {
1112 @Override
1113 public void handleMessage(Message msg) {
1114 switch (msg.what) {
1115 case TIMEOUT:
1116 handleTimeout(msg.arg1);
1117 return ;
1118 case SHOW:
1119 handleShow();
1120 return ;
1121 case HIDE:
1122 handleHide();
1123 return ;
1124 case RESET:
1125 handleReset();
1126 return ;
1127 case VERIFY_UNLOCK:
1128 handleVerifyUnlock();
1129 return;
1130 case NOTIFY_SCREEN_OFF:
1131 handleNotifyScreenOff();
1132 return;
1133 case NOTIFY_SCREEN_ON:
1134 handleNotifyScreenOn((KeyguardViewManager.ShowListener)msg.obj);
1135 return;
1136 case WAKE_WHEN_READY:
1137 handleWakeWhenReady(msg.arg1);
1138 return;
1139 case KEYGUARD_DONE:
1140
1141 ScreenStatusNotification(KEYGUARD_DONE);
1142
1143 handleKeyguardDone(msg.arg1 != 0);
1144 return;
1145 case KEYGUARD_DONE_DRAWING:
1146 handleKeyguardDoneDrawing();
1147 return;
1148 case KEYGUARD_DONE_AUTHENTICATING:
1149 keyguardDone(true);
1150 return;
1151 case SET_HIDDEN:
1152 handleSetHidden(msg.arg1 != 0);
1153 break;
1154 case KEYGUARD_TIMEOUT:
1155 synchronized (KeyguardViewMediator.this) {
1156 doKeyguardLocked();
1157 }
1158 break;
1159 }
1160 }
1161 };
calls ==>
1248 /**
1249 * Handle message sent by {@link #showLocked}.
1250 * @see #SHOW
1251 */
1252 private void handleShow() {
1253 synchronized (KeyguardViewMediator.this) {
1254 if (DEBUG) Log.d(TAG, "handleShow");
1255 if (!mSystemReady) return;
1256
1257 mKeyguardViewManager.show();
1258 mShowing = true;
1259 updateActivityLockScreenState();
1260 adjustUserActivityLocked();
1261 adjustStatusBarLocked();
1262 try {
1263 ActivityManagerNative.getDefault().closeSystemDialogs("lock");
1264 } catch (RemoteException e) {
1265 }
1266
1267 // Do this at the end to not slow down display of the keyguard.
1268 playSounds(true);
1269
1270 mShowKeyguardWakeLock.release();
1271 }
1272 }
calls==>
KeyguardViewManager::show() to show lock screen.
END