参考文章 https://www.jianshu.com/p/b07fb1e48d71
何时开始监听指纹传感器？
先来看下IKeyguardService这个binder接口有哪些回调吧
// 当另一个窗口使用FLAG_SHOW_ON_LOCK_SCREEN解除Keyguard时PhoneWindowManager调用
public void setOccluded(boolean isOccluded, boolean animate) throws android.os.RemoteException;
// 添加锁屏状态回调
public void addStateMonitorCallback(com.android.internal.policy.IKeyguardStateCallback callback) throws android.os.RemoteException;
// 核验解锁（用于快捷启动）
public void verifyUnlock(com.android.internal.policy.IKeyguardExitCallback callback) throws android.os.RemoteException;
// 解除锁屏
public void dismiss(com.android.internal.policy.IKeyguardDismissCallback callback) throws android.os.RemoteException;
// 屏保开始（Intent.ACTION_DREAMING_STARTED）
public void onDreamingStarted() throws android.os.RemoteException;
// 屏保结束（Intent.ACTION_DREAMING_STOPPED）
public void onDreamingStopped() throws android.os.RemoteException;
// 设备开始休眠 reason：OFF_BECAUSE_OF_USER/OFF_BECAUSE_OF_ADMIN/OFF_BECAUSE_OF_TIMEOUT
public void onStartedGoingToSleep(int reason) throws android.os.RemoteException;
// 休眠完成
public void onFinishedGoingToSleep(int reason, boolean cameraGestureTriggered) throws android.os.RemoteException;
// 设备开始唤醒
public void onStartedWakingUp() throws android.os.RemoteException;
// 唤醒完成
public void onFinishedWakingUp() throws android.os.RemoteException;
// 正在亮屏
public void onScreenTurningOn(com.android.internal.policy.IKeyguardDrawnCallback callback) throws android.os.RemoteException;
// 已经亮屏完成
public void onScreenTurnedOn() throws android.os.RemoteException;
// 正在灭屏
public void onScreenTurningOff() throws android.os.RemoteException;
// 灭屏完成
public void onScreenTurnedOff() throws android.os.RemoteException;
// 外部应用取消Keyguard接口
public void setKeyguardEnabled(boolean enabled) throws android.os.RemoteException;
// 开机系统准备完成回调
public void onSystemReady() throws android.os.RemoteException;
// 延时锁屏 （用于自动休眠）
public void doKeyguardTimeout(android.os.Bundle options) throws android.os.RemoteException;
// 切换用户中
public void setSwitchingUser(boolean switching) throws android.os.RemoteException;
// 设置当前用户
public void setCurrentUser(int userId) throws android.os.RemoteException;
// 系统启动完成回调
public void onBootCompleted() throws android.os.RemoteException;
// Keyguard后面的activity已经绘制完成，可以开始移除壁纸和Keyguard flag
public void startKeyguardExitAnimation(long startTime, long fadeoutDuration) throws android.os.RemoteException;
// 通知Keyguard对power键做特殊处理，使设备不进行休眠或唤醒而是启动Home（目前是空实现）
public void onShortPowerPressedGoHome() throws android.os.RemoteException;
onStartedGoingToSleep/
onFinishedGoingToSleep/
onScreenTurningOff/
onScreenTurnedOff
这四个接口是在power键按下后触发，其中onStartedGoingToSleep最先被触发，他们的
调用顺序我会在后文里讲解。
1.指纹接口注册
//播放声音后，dispatchStartedGoingToSleep，就会开始监听指纹状态
@KeyguardViewMediator.java
771 public void onStartedGoingToSleep(int why) {
772 if (DEBUG) Log.d(TAG, "onStartedGoingToSleep(" + why + ")");
773 synchronized (this) {
...
803 } else if (!mLockPatternUtils.isLockScreenDisabled(currentUser)) {
804 mPendingLock = true;
805 }
806
807 if (mPendingLock) {
808 playSounds(true);
809 }
810 }
811 KeyguardUpdateMonitor.getInstance(mContext).dispatchStartedGoingToSleep(why);
812 notifyStartedGoingToSleep();
813 }
814
@frameworks/base/packages/SystemUI/src/com/android/keyguard/KeyguardUpdateMonitor.java#285
1839 public void dispatchStartedGoingToSleep(int why) {
1840 mHandler.sendMessage(mHandler.obtainMessage(MSG_STARTED_GOING_TO_SLEEP, why, 0));
1841 }
284 case MSG_STARTED_GOING_TO_SLEEP:
285 handleStartedGoingToSleep(msg.arg1);
286 break;
1017 protected void handleStartedGoingToSleep(int arg1) {
1018 clearFingerprintRecognized();
1019 final int count = mCallbacks.size();
1020 for (int i = 0; i < count; i++) {
1021 KeyguardUpdateMonitorCallback cb = mCallbacks.get(i).get();
1022 if (cb != null) {
1023 cb.onStartedGoingToSleep(arg1);
1024 }
1025 }
1026 mGoingToSleep = true;
1027 updateFingerprintListeningState();
1028 }
1190 private void updateFingerprintListeningState() {
1191 // If this message exists, we should not authenticate again until this message is
1192 // consumed by the handler
1193 if (mHandler.hasMessages(MSG_FINGERPRINT_AUTHENTICATION_CONTINUE)) {
1194 return;
1195 }
1196 mHandler.removeCallbacks(mRetryFingerprintAuthentication);
1197 boolean shouldListenForFingerprint = shouldListenForFingerprint();
1198 if (mFingerprintRunningState == FINGERPRINT_STATE_RUNNING && !shouldListenForFingerprint) {
1199 stopListeningForFingerprint();
1200 } else if (mFingerprintRunningState != FINGERPRINT_STATE_RUNNING
1201 && shouldListenForFingerprint) {
1202 startListeningForFingerprint();
1203 }
1204 }
1220 private void startListeningForFingerprint() {
1221 if (mFingerprintRunningState == FINGERPRINT_STATE_CANCELLING) {
1222 setFingerprintRunningState(FINGERPRINT_STATE_CANCELLING_RESTARTING);
1223 return;
1224 }
1225 if (DEBUG) Log.v(TAG, "startListeningForFingerprint()"); // Log
1226 int userId = ActivityManager.getCurrentUser();
1227 if (isUnlockWithFingerprintPossible(userId)) {
1228 if (mFingerprintCancelSignal != null) {
1229 mFingerprintCancelSignal.cancel();
1230 }
1231 mFingerprintCancelSignal = new CancellationSignal();
1232 mFpm.authenticate(null, mFingerprintCancelSignal, 0, mAuthenticationCallback, null, userId); //真正监听authenticate,写mAuthenticationCallback
1233 setFingerprintRunningState(FINGERPRINT_STATE_RUNNING);
1234 }
1235 }2.指纹接口
写这个mAuthenticationCallback，并且重写他的几个方法
818 private FingerprintManager.AuthenticationCallback mAuthenticationCallback
819 = new AuthenticationCallback() {
820
821 @Override
822 public void onAuthenticationFailed() {
823 handleFingerprintAuthFailed();
824 };
825
826 @Override
827 public void onAuthenticationSucceeded(AuthenticationResult result) {
828 Trace.beginSection("KeyguardUpdateMonitor#onAuthenticationSucceeded");
829 handleFingerprintAuthenticated(result.getUserId());
830 Trace.endSection();
831 }
832
833 @Override
834 public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
835 handleFingerprintHelp(helpMsgId, helpString.toString());
836 }
837
838 @Override
839 public void onAuthenticationError(int errMsgId, CharSequence errString) {
840 handleFingerprintError(errMsgId, errString.toString());
841 }
842
843 @Override
844 public void onAuthenticationAcquired(int acquireInfo) {
845 handleFingerprintAcquired(acquireInfo);
846 }
847 };3.指纹认证成功后调用 onAuthenticationSucceeded
遍历所有KeyguardUpdateMonitorCallback，回调onFingerprintAuthenticated
533 private void handleFingerprintAuthenticated(int authUserId) {
534 Trace.beginSection("KeyGuardUpdateMonitor#handlerFingerPrintAuthenticated");
535 try {
536 final int userId;
537 try {
538 userId = ActivityManager.getService().getCurrentUser().id;
539 } catch (RemoteException e) {
540 Log.e(TAG, "Failed to get current user id: ", e);
541 return;
542 }
543 if (userId != authUserId) {
544 Log.d(TAG, "Fingerprint authenticated for wrong user: " + authUserId);
545 return;
546 }
547 if (isFingerprintDisabled(userId)) {
548 Log.d(TAG, "Fingerprint disabled by DPM for userId: " + userId);
549 return;
550 }
551 onFingerprintAuthenticated(userId);
552 } finally {
553 setFingerprintRunningState(FINGERPRINT_STATE_STOPPED);
554 }
555 Trace.endSection();
556 }
//遍历 KeyguardUpdateMonitorCallback，进行回调。
486 private void onFingerprintAuthenticated(int userId) {
487 Trace.beginSection("KeyGuardUpdateMonitor#onFingerPrintAuthenticated");
488 mUserFingerprintAuthenticated.put(userId, true);
489 // Update/refresh trust state only if user can skip bouncer
490 if (getUserCanSkipBouncer(userId)) {
491 mTrustManager.unlockedByFingerprintForUser(userId);
492 }
493 // Don't send cancel if authentication succeeds
494 mFingerprintCancelSignal = null;
495 for (int i = 0; i < mCallbacks.size(); i++) {
496 KeyguardUpdateMonitorCallback cb = mCallbacks.get(i).get();
497 if (cb != null) {
498 cb.onFingerprintAuthenticated(userId);
499 }
500 }
501
502 mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_FINGERPRINT_AUTHENTICATION_CONTINUE),
503 FINGERPRINT_CONTINUE_DELAY_MS);
504
505 // Only authenticate fingerprint once when assistant is visible
506 mAssistantVisible = false;
507
508 Trace.endSection();
509 }4.FingerprintUnlockController认证成功，唤醒
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/FingerprintUnlockController.java#255
189 @Override
190 public void onFingerprintAuthenticated(int userId) {
191 Trace.beginSection("FingerprintUnlockController#onFingerprintAuthenticated");
192 if (mUpdateMonitor.isGoingToSleep()) {
193 mPendingAuthenticatedUserId = userId;
194 Trace.endSection();
195 return;
196 }
197 startWakeAndUnlock(calculateMode()); //这里
198 }
200 public void startWakeAndUnlock(int mode) {
201 // TODO(b/62444020): remove when this bug is fixed
202 Log.v(TAG, "startWakeAndUnlock(" + mode + ")"); //指纹模式解锁模式应该是2，可对比正常情况看
203 boolean wasDeviceInteractive = mUpdateMonitor.isDeviceInteractive();
204 mMode = mode;
205 mHasScreenTurnedOnSinceAuthenticating = false;
206 if (mMode == MODE_WAKE_AND_UNLOCK_PULSING && pulsingOrAod()) {
207 // If we are waking the device up while we are pulsing the clock and the
208 // notifications would light up first, creating an unpleasant animation.
209 // Defer changing the screen brightness by forcing doze brightness on our window
210 // until the clock and the notifications are faded out.
211 mStatusBarWindowManager.setForceDozeBrightness(true);
212 }
213 if (!wasDeviceInteractive) {
214 if (DEBUG_FP_WAKELOCK) {
215 Log.i(TAG, "fp wakelock: Authenticated, waking up..."); //Log fp wakelock: Authenticated, waking up...
216 }
217 mPowerManager.wakeUp(SystemClock.uptimeMillis(), "android.policy:FINGERPRINT"); //wake up
218 }
219 Trace.beginSection("release wake-and-unlock");
220 releaseFingerprintWakeLock();
221 Trace.endSection();
222 switch (mMode) {
223 case MODE_DISMISS_BOUNCER:
224 Trace.beginSection("MODE_DISMISS");
225 mStatusBarKeyguardViewManager.notifyKeyguardAuthenticated(
226 false /* strongAuth */);
227 Trace.endSection();
228 break;
229 case MODE_UNLOCK:
230 case MODE_SHOW_BOUNCER:
231 Trace.beginSection("MODE_UNLOCK or MODE_SHOW_BOUNCER");
232 if (!wasDeviceInteractive) {
233 mStatusBarKeyguardViewManager.notifyDeviceWakeUpRequested();
234 mPendingShowBouncer = true;
235 } else {
236 showBouncer();
237 }
238 Trace.endSection();
239 break;
240 case MODE_WAKE_AND_UNLOCK_FROM_DREAM:
241 case MODE_WAKE_AND_UNLOCK_PULSING:
242 case MODE_WAKE_AND_UNLOCK:
243 if (mMode == MODE_WAKE_AND_UNLOCK_PULSING) {
244 Trace.beginSection("MODE_WAKE_AND_UNLOCK_PULSING");
245 mStatusBar.updateMediaMetaData(false /* metaDataChanged */,
246 true /* allowEnterAnimation */);
247 } else if (mMode == MODE_WAKE_AND_UNLOCK){
248 Trace.beginSection("MODE_WAKE_AND_UNLOCK");
249 mDozeScrimController.abortDoze();
250 } else {
251 Trace.beginSection("MODE_WAKE_AND_UNLOCK_FROM_DREAM");
252 mUpdateMonitor.awakenFromDream();
253 }
254 mStatusBarWindowManager.setStatusBarFocusable(false);
255 mKeyguardViewMediator.onWakeAndUnlocking();
256 mScrimController.setWakeAndUnlocking();
257 mDozeScrimController.setWakeAndUnlocking();
258 if (mStatusBar.getNavigationBarView() != null) {
259 mStatusBar.getNavigationBarView().setWakeAndUnlocking(true);
260 }
261 Trace.endSection();
262 break;
263 case MODE_ONLY_WAKE:
264 case MODE_NONE:
265 break;
266 }
267 mStatusBar.notifyFpAuthModeChanged();
268 Trace.endSection();
269 }5.隐藏Keyguard
@frameworks/base/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java
public void onWakeAndUnlocking() {
Trace.beginSection("KeyguardViewMediator#onWakeAndUnlocking");
mWakeAndUnlocking = true;
keyguardDone();
Trace.endSection();
}
1476 public void keyguardDone() {
1477 Trace.beginSection("KeyguardViewMediator#keyguardDone");
1478 if (DEBUG) Log.d(TAG, "keyguardDone()");
1479 userActivity();
1480 EventLog.writeEvent(70000, 2);
1481 Message msg = mHandler.obtainMessage(KEYGUARD_DONE);
1482 mHandler.sendMessage(msg);
1483 Trace.endSection();
1484 }
1535 case KEYGUARD_DONE:
1536 Trace.beginSection("KeyguardViewMediator#handleMessage KEYGUARD_DONE");
1537 handleKeyguardDone();
1538 Trace.endSection();
1539 break;
1589 /**
1590 * @see #keyguardDone
1591 * @see #KEYGUARD_DONE
1592 */
1593 private void handleKeyguardDone() {
1594 Trace.beginSection("KeyguardViewMediator#handleKeyguardDone");
1595 final int currentUser = KeyguardUpdateMonitor.getCurrentUser();
1596 mUiOffloadThread.submit(() -> {
1597 if (mLockPatternUtils.isSecure(currentUser)) {
1598 mLockPatternUtils.getDevicePolicyManager().reportKeyguardDismissed(currentUser);
1599 }
1600 });
1601 if (DEBUG) Log.d(TAG, "handleKeyguardDone"); //Log
1602 synchronized (this) {
1603 resetKeyguardDonePendingLocked();
1604 }
1605
1606 mUpdateMonitor.clearFailedUnlockAttempts();
1607 mUpdateMonitor.clearFingerprintRecognized();
1608
1609 if (mGoingToSleep) {
1610 Log.i(TAG, "Device is going to sleep, aborting keyguardDone");
1611 return;
1612 }
1613 if (mExitSecureCallback != null) {
1614 try {
1615 mExitSecureCallback.onKeyguardExitResult(true /* authenciated */);
1616 } catch (RemoteException e) {
1617 Slog.w(TAG, "Failed to call onKeyguardExitResult()", e);
1618 }
1619
1620 mExitSecureCallback = null;
1621
1622 // after succesfully exiting securely, no need to reshow
1623 // the keyguard when they've released the lock
1624 mExternallyEnabled = true;
1625 mNeedToReshowWhenReenabled = false;
1626 updateInputRestricted();
1627 }
1628
1629 handleHide(); //hide
1630 Trace.endSection();
1631 }
1632
1787 /**
1788 * Handle message sent by {@link #hideLocked()}
1789 * @see #HIDE
1790 */
1791 private void handleHide() {
1792 Trace.beginSection("KeyguardViewMediator#handleHide");
1793 synchronized (KeyguardViewMediator.this) {
1794 if (DEBUG) Log.d(TAG, "handleHide");
1795
1796 if (mustNotUnlockCurrentUser()) {
1797 // In split system user mode, we never unlock system user. The end user has to
1798 // switch to another user.
1799 // TODO: We should stop it early by disabling the swipe up flow. Right now swipe up
1800 // still completes and makes the screen blank.
1801 if (DEBUG) Log.d(TAG, "Split system user, quit unlocking.");
1802 return;
1803 }
1804 mHiding = true;
1805
1806 if (mShowing && !mOccluded) {
1807 mKeyguardGoingAwayRunnable.run(); //这里
1808 } else {
1809 handleStartKeyguardExitAnimation(
1810 SystemClock.uptimeMillis() + mHideAnimation.getStartOffset(),
1811 mHideAnimation.getDuration());
1812 }
1813 }
1814 Trace.endSection();
1815 }
1816
1817 private void handleStartKeyguardExitAnimation(long startTime, long fadeoutDuration) {
1818 Trace.beginSection("KeyguardViewMediator#handleStartKeyguardExitAnimation");
1819 if (DEBUG) Log.d(TAG, "handleStartKeyguardExitAnimation startTime=" + startTime
1820 + " fadeoutDuration=" + fadeoutDuration);
1821 synchronized (KeyguardViewMediator.this) {
1822
1823 if (!mHiding) {
1824 return;
1825 }
1826 mHiding = false;
1841 playSounds(false);
1842 }
1843
1844 mWakeAndUnlocking = false;
1845 setShowingLocked(false); //set mshow = false
1846 mDismissCallbackRegistry.notifyDismissSucceeded();
1847 mStatusBarKeyguardViewManager.hide(startTime, fadeoutDuration);
1848 resetKeyguardDonePendingLocked();
1849 mHideAnimationRun = false;
1850 adjustStatusBarLocked();
1851 sendUserPresentBroadcast();
1852 mUpdateMonitor.setKeyguardGoingAway(false /* goingAway */);
1853 }
1854 Trace.endSection();
1855 }Log流程:
FingerprintUnlockController startWakeAndUnlock(2)
fp wakelock: Authenticated, waking up..
mPowerManager.wakeUp
keyguardDone
handleKeyguardDone
handleHide
handleStartKeyguardExitAnimation