Android 人脸解锁源码剖析
程序员Android
共 59201字，需浏览 119分钟
·
2021-08-29 13:17
和你一起终身学习，这里是程序员Android
经典好文推荐，通过阅读本文，您将收获以下知识点:
一、人脸识别身份验证HIDL
二、人脸模块流程分析
三、人脸录入
四、人脸匹配
五、人脸解锁屏幕
一、人脸识别身份验证HIDL
借助人脸识别身份验证功能，用户只需要将自己的面孔对准设备即可将其解锁。Android 10 增加了对一种新的人脸识别身份验证堆栈的支持，这种堆栈可安全处理摄像头帧，从而在支持的硬件上进行人脸识别身份验证时保障安全和隐私。Android 10 还提供了一种简单的安全合规实现方法，以支持通过应用集成来完成交易（例如网上银行或其他服务）。
Android 人脸识别身份验证堆栈是Android 10中的新实现。该实现引入了 IBiometricsFace.hal、IBiometricsFaceClientCallback.hal、和type.hal接口。
要实现Face HIDL，你必须在某个供应商专用库中实现 IBiometricsFace.hal的所有方法
人脸识别架构
BiometricPrompt API包括人脸识别、指纹识别和虹膜识别在内的所有生物识别身份验证方法。Face HAL会与以下组件交互：
FaceManager
FaceManager是一个私有接口，用于维护FaceService的之间连接。Keyguard通过该接口访问具有自定义界面的人脸识别身份验证硬件。应用无权访问FaceManager，必须改为使用BiometricPrompt。
FaceService
该框架实现用于管理对人脸识别身份验证硬件的访问权限。它包含基本的注册和身份验证状态机以及各种其他辅助程序（例如枚举程序）。处于稳定性和安全性方面的考虑，不允许在此进程中运行任何供应商代码。所有供应商代码都通过Face 1.0 HIDL接口访问。
faced
这是一个Linux可执行文件，用于实现供FaceService使用的Face 1.0 HIDL 接口。它会将自身注册为 IBiometricsFace@1.0以便FaceService能够找到它。
二、人脸模块流程分析
要实现Face HIDL，你必须在某个供应商专用库中实现 IBiometricsFace.hal的所有方法
IBiometricsFace.hal中主要包括以下主要方法：setCallback(); setActiveUser(); revokeChallenge(); enroll(); cancel(); enumerate(); remove(); authenticate(); userActivity; resetLockout(); 其余的四个都是同步方法，应将其阻塞时间缩至最短以免拖延框架。它们分别是generateChallenge(); setFeature(); getFeature; getAuthentitorId()
人脸模块中的录入，匹配，移除是三个大部分；
三、人脸录入
人脸录入的入口在Settings中的FaceEnrollEnrolling.java中
在这个类中没有看到明显的录入的方法，只有一些UI的加载和一些录入动画的逻辑。
在此类中的on EnrollmentProgressChange(int steps, int remaining)更新录入进度的方法中用通过传递进来的remaining来获取实际的进度；当remaining = 0 时打开录入结束界面launchFinish(mToken);
packages/apps/Settings/src/com/android/settings/biometrics/face/FaceEnrollEnrolling.java
@Override
public void onEnrollmentProgressChange(int steps, int remaining) {
if (DEBUG) {
Log.v(TAG, "Steps: " + steps + " Remaining: " + remaining);
}
/*重点关注*/
mPreviewFragment.onEnrollmentProgressChange(steps, remaining);
// TODO: Update the actual animation
showError("Steps: " + steps + " Remaining: " + remaining);
// TODO: Have this match any animations that UX comes up with
if (remaining == 0) {
launchFinish(mToken);
}
packages/apps/Settings/src/com/android/settings/biometrics/face/FaceEnrollPreviewFragment.java
@Override
public void onEnrollmentProgressChange(int steps, int remaining) {
/*重点关注*/
mAnimationDrawable.onEnrollmentProgressChange(steps, remaining);
}
packages/apps/Settings/src/com/android/settings/biometrics/face/FaceEnrollAnimationDrawable.java
@Override
public void onEnrollmentProgressChange(int steps, int remaining) {
/*重点关注*/
mParticleCollection.onEnrollmentProgressChange(steps, remaining);
}
packages/apps/Settings/src/com/android/settings/biometrics/face/ParticleCollection.java
/*重点关注*/
public class ParticleCollection implements BiometricEnrollSidecar.Listener {
......
@Override
public void onEnrollmentProgressChange(int steps, int remaining) {
if (remaining == 0) {
updateState(STATE_COMPLETE);
}
}
}
由此可以看出此类是实现了BiometricEnrollSidecar.Listener从而调用onEnrollmentProgressChange通过传入的remaining值对录入人脸的进度条进行更新的
packages/apps/Settings/src/com/android/settings/biometrics/BiometricEnrollSidecar.java
public abstract class BiometricEnrollSidecar extends InstrumentedFragment {
public interface Listener {
void onEnrollmentHelp(int helpMsgId, CharSequence helpString);
void onEnrollmentError(int errMsgId, CharSequence errString);
/*重点关注*/
void onEnrollmentProgressChange(int steps, int remaining);
}
onEnrollmentProgressChange
protected void onEnrollmentProgress(int remaining) {
if (mEnrollmentSteps == -1) {
mEnrollmentSteps = remaining;
}
mEnrollmentRemaining = remaining;
mDone = remaining == 0;
if (mListener != null) {
/*重点关注*/
mListener.onEnrollmentProgressChange(mEnrollmentSteps, remaining);
} else {
mQueuedEvents.add(new QueuedEnrollmentProgress(mEnrollmentSteps, remaining));
}
}
底层在录制人脸的时候会在FaceManager中调用onEnrollmentProgress方法，并将进度remainiing返回过来，BiometricEnrollSidecar内部写有Listener，在使用Listener的对象将onEnrollmentProgress的值传递进去，使更多实现Listener接口的类可以接收到
packages/apps/Settings/src/com/android/settings/biometrics/face/FaceEnrollEnrolling.java
我们再回到这个类中去看看startEnrollment录入的方法
@Override
public void startEnrollment() {
/*重点关注*/
super.startEnrollment();
mPreviewFragment = (FaceEnrollPreviewFragment) getSupportFragmentManager()
.findFragmentByTag(TAG_FACE_PREVIEW);
if (mPreviewFragment == null) {
mPreviewFragment = new FaceEnrollPreviewFragment();
getSupportFragmentManager().beginTransaction().add(mPreviewFragment, TAG_FACE_PREVIEW)
.commitAllowingStateLoss();
}
mPreviewFragment.setListener(mListener);
}
此方法中没有明显录入的方法，可见录入方法存在于他的父类中
packages/apps/Settings/src/com/android/settings/biometrics/BiometricsEnrollEnrolling.java
public void startEnrollment() {
mSidecar = (BiometricEnrollSidecar) getSupportFragmentManager()
.findFragmentByTag(TAG_SIDECAR);
if (mSidecar == null) {
mSidecar = getSidecar();
getSupportFragmentManager().beginTransaction().add(mSidecar, TAG_SIDECAR)
.commitAllowingStateLoss();
}
/*重点关注*/
mSidecar.setListener(this);
}
由此可知是通过给mSidecar设置setListener监听传入变化而开始录入的
packages/apps/Settings/src/com/android/settings/biometrics/face/FaceEnrollEnrolling.java
@Override
public void startEnrollment() {
super.startEnrollment();
if (mUserId != UserHandle.USER_NULL) {
mFaceManager.setActiveUser(mUserId);
}
/*重点关注*/
mFaceManager.enroll(mToken, mEnrollmentCancel,
mEnrollmentCallback, mDisabledFeatures);
}
frameworks/base/core/java/android/hardware/face/FaceManager.java
public void enroll(byte[] token, CancellationSignal cancel,
EnrollmentCallback callback, int[] disabledFeatures) {
if (callback == null) {
throw new IllegalArgumentException("Must supply an enrollment callback");
}
if (cancel != null) {
if (cancel.isCanceled()) {
Log.w(TAG, "enrollment already canceled");
return;
} else {
cancel.setOnCancelListener(new OnEnrollCancelListener());
}
}
if (mService != null) {
try {
mEnrollmentCallback = callback;
Trace.beginSection("FaceManager#enroll");
/*重点关注*/
mService.enroll(mToken, token, mServiceReceiver,
mContext.getOpPackageName(), disabledFeatures);
} catch (RemoteException e) {
Log.w(TAG, "Remote exception in enroll: ", e);
if (callback != null) {
// Though this may not be a hardware issue, it will cause apps to give up or
// try again later.
callback.onEnrollmentError(FACE_ERROR_HW_UNAVAILABLE,
getErrorString(mContext, FACE_ERROR_HW_UNAVAILABLE,
0 /* vendorCode */));
}
} finally {
Trace.endSection();
}
}
}
frameworks/base/services/core/java/com/android/server/biometrics/face/FaceService.java
public void enroll(final IBinder token, final byte[] cryptoToken,
final IFaceServiceReceiver receiver, final String opPackageName,
final int[] disabledFeatures) {
checkPermission(MANAGE_BIOMETRIC);
final boolean restricted = isRestricted();
final EnrollClientImpl client = new EnrollClientImpl(getContext(), mDaemonWrapper,
mHalDeviceId, token, new ServiceListenerImpl(receiver), mCurrentUserId,
0 /* groupId */, cryptoToken, restricted, opPackageName, disabledFeatures) {
@Override
public int[] getAcquireIgnorelist() {
return mEnrollIgnoreList;
}
@Override
public int[] getAcquireVendorIgnorelist() {
return mEnrollIgnoreListVendor;
}
@Override
public boolean shouldVibrate() {
return false;
}
@Override
protected int statsModality() {
return FaceService.this.statsModality();
}
};
/*重点关注*/
enrollInternal(client, mCurrentUserId);
}
frameworks/base/services/core/java/com/android/server/biometrics/BiometricServiceBase.java
if (hasReachedEnrollmentLimit(userId)) {
return;
}
// Group ID is arbitrarily set to parent profile user ID. It just represents
// the default biometrics for the user.
if (!isCurrentUserOrProfile(userId)) {
return;
}
mHandler.post(() -> {
/*重点关注*/
startClient(client, true /* initiatedByClient */);
});
}
startClient(client, true /* initiatedByClient */);
ClientMonitor currentClient = mCurrentClient;
if (currentClient != null) {
if (DEBUG) Slog.v(getTag(), "request stop current client " +
currentClient.getOwnerString());
// This check only matters for FingerprintService, since enumerate may call back
// multiple times.
if (currentClient instanceof InternalEnumerateClient
|| currentClient instanceof InternalRemovalClient) {
// This condition means we're currently running internal diagnostics to
// remove extra templates in the hardware and/or the software
// TODO: design an escape hatch in case client never finishes
if (newClient != null) {
Slog.w(getTag(), "Internal cleanup in progress but trying to start client "
+ newClient.getClass().getSuperclass().getSimpleName()
+ "(" + newClient.getOwnerString() + ")"
+ ", initiatedByClient = " + initiatedByClient);
}
} else {
currentClient.stop(initiatedByClient);
// Only post the reset runnable for non-cleanup clients. Cleanup clients should
// never be forcibly stopped since they ensure synchronization between HAL and
// framework. Thus, we should instead just start the pending client once cleanup
// finishes instead of using the reset runnable.
mHandler.removeCallbacks(mResetClientState);
mHandler.postDelayed(mResetClientState, CANCEL_TIMEOUT_LIMIT);
}
mPendingClient = newClient;
} else if (newClient != null) {
// For BiometricPrompt clients, do not start until
// <Biometric>Service#startPreparedClient is called. BiometricService waits until all
// modalities are ready before initiating authentication.
if (newClient instanceof AuthenticationClient) {
AuthenticationClient client = (AuthenticationClient) newClient;
if (client.isBiometricPrompt()) {
if (DEBUG) Slog.v(getTag(), "Returning cookie: " + client.getCookie());
mCurrentClient = newClient;
if (mBiometricService == null) {
mBiometricService = IBiometricService.Stub.asInterface(
ServiceManager.getService(Context.BIOMETRIC_SERVICE));
}
try {
mBiometricService.onReadyForAuthentication(client.getCookie(),
client.getRequireConfirmation(), client.getTargetUserId());
} catch (RemoteException e) {
Slog.e(getTag(), "Remote exception", e);
}
return;
}
}
// We are not a BiometricPrompt client, start the client immediately
mCurrentClient = newClient;
/*重点关注*/
startCurrentClient(mCurrentClient.getCookie());
}
}
在此将EnrollClient的对象传进去
startCurrentClient(mCurrentClient.getCookie());
protected void startCurrentClient(int cookie) {
if (mCurrentClient == null) {
Slog.e(getTag(), "Trying to start null client!");
return;
}
if (DEBUG) Slog.v(getTag(), "starting client "
+ mCurrentClient.getClass().getSuperclass().getSimpleName()
+ "(" + mCurrentClient.getOwnerString() + ")"
+ " cookie: " + cookie + "/" + mCurrentClient.getCookie());
if (cookie != mCurrentClient.getCookie()) {
Slog.e(getTag(), "Mismatched cookie");
return;
}
notifyClientActiveCallbacks(true);
/*重点关注*/
mCurrentClient.start();
}
frameworks/base/services/core/java/com/android/server/biometrics/EnrollClient.java
@Override
public int start() {
mEnrollmentStartTimeMs = System.currentTimeMillis();
final int timeout = (int) (ENROLLMENT_TIMEOUT_MS / MS_PER_SEC);
try {
final ArrayList<Integer> disabledFeatures = new ArrayList<>();
for (int i = 0; i < mDisabledFeatures.length; i++) {
disabledFeatures.add(mDisabledFeatures[i]);
}
/*重点关注*/
final int result = getDaemonWrapper().enroll(mCryptoToken, getGroupId(), timeout,
disabledFeatures);
if (result != 0) {
Slog.w(getLogTag(), "startEnroll failed, result=" + result);
mMetricsLogger.histogram(mConstants.tagEnrollStartError(), result);
onError(getHalDeviceId(), BiometricConstants.BIOMETRIC_ERROR_HW_UNAVAILABLE,
0 /* vendorCode */);
return result;
}
} catch (RemoteException e) {
Slog.e(getLogTag(), "startEnroll failed", e);
}
return 0; // success
}
start 方法会调用faced，调用底层的人脸库，底层库返回结果后会调用onEnrollResult来反馈结果receiver，再往上层反馈。这就是人脸的录制流程。在onEnrollResult中当remaining等于0的时候完成录制，调用addBiometricForUser。
FaceManager.java中注册了IFaceServiceReceiver，实现onEnrollResult方法发送 MSG_ENROLL_RESULT
frameworks/base/core/java/android/hardware/face/FaceManager.java
private IFaceServiceReceiver mServiceReceiver = new IFaceServiceReceiver.Stub() {
@Override // binder call
public void onEnrollResult(long deviceId, int faceId, int remaining) {
/*重点关注*/
mHandler.obtainMessage(MSG_ENROLL_RESULT, remaining, 0,
new Face(null, faceId, deviceId)).sendToTarget();
}
...
MSG_ENROLL_RESULT
public void handleMessage(android.os.Message msg) {
Trace.beginSection("FaceManager#handleMessage: " + Integer.toString(msg.what));
switch (msg.what) {
case MSG_ENROLL_RESULT:
/*重点关注*/
sendEnrollResult((Face) msg.obj, msg.arg1 /* remaining */);
break;
...
sendEnrollResult
private void sendEnrollResult(Face face, int remaining) {
if (mEnrollmentCallback != null) {
mEnrollmentCallback.onEnrollmentProgress(remaining);
}
}
四、人脸匹配
人脸解锁的入口在Keyguard中
系统灭屏之后会调用PhoneWindowManager的startedGoingToSleep方法，继而调用KeyguardDelegate.onStartedGoingToSleep方法。
继而又会调用KeyguardServiceWrapper.java ==》onStartedGoingToSleep()方法；再调用KeyguardService.java ==》onStartedGoingToSleep()方法；并最终在KeyguardViewMediator.java ==》dispatchStartedGoingToSleep() 达到对GoingToSleep事件的监听
frameworks/base/packages/SystemUI/src/com/android/keyguard/KeyguardUpdateMonitor.java
public void dispatchStartedGoingToSleep(int why) {
/*重点关注*/
mHandler.sendMessage(mHandler.obtainMessage(MSG_STARTED_GOING_TO_SLEEP, why, 0));
}
MSG_STARTED_GOING_TO_SLEEP
case MSG_STARTED_GOING_TO_SLEEP:
/*重点关注*/
handleStartedGoingToSleep(msg.arg1);
break;
handleStartedGoingToSleep(msg.arg1);
protected void handleStartedGoingToSleep(int arg1) {
clearBiometricRecognized();
final int count = mCallbacks.size();
for (int i = 0; i < count; i++) {
KeyguardUpdateMonitorCallback cb = mCallbacks.get(i).get();
if (cb != null) {
cb.onStartedGoingToSleep(arg1);
}
}
mGoingToSleep = true;
/*重点关注*/
updateBiometricListeningState();//更新生物识别状态
}
updateBiometricListeningState()
//在这个方法中我们可以看到同时更新了指纹和人脸的状态
private void updateBiometricListeningState() {
updateFingerprintListeningState();
/*重点关注*/
updateFaceListeningState();
}
updateFaceListeningState()
private void updateFaceListeningState() {
// If this message exists, we should not authenticate again until this message is
// consumed by the handler
if (mHandler.hasMessages(MSG_BIOMETRIC_AUTHENTICATION_CONTINUE)) {
return;
}
mHandler.removeCallbacks(mRetryFaceAuthentication);
boolean shouldListenForFace = shouldListenForFace();
if (mFaceRunningState == BIOMETRIC_STATE_RUNNING && !shouldListenForFace) {
stopListeningForFace();
} else if (mFaceRunningState != BIOMETRIC_STATE_RUNNING
&& shouldListenForFace) {
/*重点关注*/
startListeningForFace();
}
}
startListeningForFace()
private void startListeningForFace() {
if (mFaceRunningState == BIOMETRIC_STATE_CANCELLING) {
setFaceRunningState(BIOMETRIC_STATE_CANCELLING_RESTARTING);
return;
}
if (DEBUG) Log.v(TAG, "startListeningForFace()");
int userId = getCurrentUser();
if (isUnlockWithFacePossible(userId)) {
if (mFaceCancelSignal != null) {
mFaceCancelSignal.cancel();
}
mFaceCancelSignal = new CancellationSignal();
/*重点关注*/
mFaceManager.authenticate(null, mFaceCancelSignal, 0,
mFaceAuthenticationCallback, null, userId);
setFaceRunningState(BIOMETRIC_STATE_RUNNING);
}
}
frameworks/base/core/java/android/hardware/face/FaceManager.java
public void authenticate(@Nullable CryptoObject crypto, @Nullable CancellationSignal cancel,
int flags, @NonNull AuthenticationCallback callback, @Nullable Handler handler,
int userId) {
if (callback == null) {
throw new IllegalArgumentException("Must supply an authentication callback");
}
if (cancel != null) {
if (cancel.isCanceled()) {
Log.w(TAG, "authentication already canceled");
return;
} else {
cancel.setOnCancelListener(new OnAuthenticationCancelListener(crypto));
}
}
if (mService != null) {
try {
useHandler(handler);
mAuthenticationCallback = callback;
mCryptoObject = crypto;
long sessionId = crypto != null ? crypto.getOpId() : 0;
Trace.beginSection("FaceManager#authenticate");
/*重点关注*/
mService.authenticate(mToken, sessionId, userId, mServiceReceiver,
flags, mContext.getOpPackageName());
} catch (RemoteException e) {
Log.w(TAG, "Remote exception while authenticating: ", e);
if (callback != null) {
// Though this may not be a hardware issue, it will cause apps to give up or
// try again later.
callback.onAuthenticationError(FACE_ERROR_HW_UNAVAILABLE,
getErrorString(mContext, FACE_ERROR_HW_UNAVAILABLE,
0 /* vendorCode */));
}
} finally {
Trace.endSection();
}
}
}
frameworks/base/services/core/java/com/android/server/biometrics/face/FaceService.java
@Override // Binder call
public void authenticate(final IBinder token, final long opId, int userId,
final IFaceServiceReceiver receiver, final int flags,
final String opPackageName) {
checkPermission(USE_BIOMETRIC_INTERNAL);
updateActiveGroup(userId, opPackageName);
final boolean restricted = isRestricted();
final AuthenticationClientImpl client = new FaceAuthClient(getContext(),
mDaemonWrapper, mHalDeviceId, token, new ServiceListenerImpl(receiver),
mCurrentUserId, 0 /* groupId */, opId, restricted, opPackageName,
0 /* cookie */, false /* requireConfirmation */);
/*重点关注*/
authenticateInternal(client, opId, opPackageName);
}
frameworks/base/services/core/java/com/android/server/biometrics/BiometricServiceBase.java
protected void authenticateInternal(AuthenticationClientImpl client, long opId,
String opPackageName) {
final int callingUid = Binder.getCallingUid();
final int callingPid = Binder.getCallingPid();
final int callingUserId = UserHandle.getCallingUserId();
authenticateInternal(client, opId, opPackageName, callingUid, callingPid, callingUserId);
}
frameworks/base/services/core/java/com/android/server/biometrics/BiometricServiceBase.java
protected void authenticateInternal(AuthenticationClientImpl client, long opId,
String opPackageName, int callingUid, int callingPid, int callingUserId) {
if (!canUseBiometric(opPackageName, true /* foregroundOnly */, callingUid, callingPid,
callingUserId)) {
if (DEBUG) Slog.v(getTag(), "authenticate(): reject " + opPackageName);
return;
}
mHandler.post(() -> {
mMetricsLogger.histogram(getConstants().tagAuthToken(), opId != 0L ? 1 : 0);
// Get performance stats object for this user.
HashMap<Integer, PerformanceStats> pmap
= (opId == 0) ? mPerformanceMap : mCryptoPerformanceMap;
PerformanceStats stats = pmap.get(mCurrentUserId);
if (stats == null) {
stats = new PerformanceStats();
pmap.put(mCurrentUserId, stats);
}
mPerformanceStats = stats;
mIsCrypto = (opId != 0);
/*重点关注*/
startAuthentication(client, opPackageName);
});
}
startAuthentication(client, opPackageName);
private void startAuthentication(AuthenticationClientImpl client, String opPackageName) {
if (DEBUG) Slog.v(getTag(), "startAuthentication(" + opPackageName + ")");
int lockoutMode = getLockoutMode();
if (lockoutMode != AuthenticationClient.LOCKOUT_NONE) {
Slog.v(getTag(), "In lockout mode(" + lockoutMode + ") ; disallowing authentication");
int errorCode = lockoutMode == AuthenticationClient.LOCKOUT_TIMED ?
BiometricConstants.BIOMETRIC_ERROR_LOCKOUT :
BiometricConstants.BIOMETRIC_ERROR_LOCKOUT_PERMANENT;
if (!client.onError(getHalDeviceId(), errorCode, 0 /* vendorCode */)) {
Slog.w(getTag(), "Cannot send permanent lockout message to client");
}
return;
}
/*重点关注*/
startClient(client, true /* initiatedByClient */);
//这里将AuthenticationClient传递进去
}
startClient(client, true /* initiatedByClient */);
private void startClient(ClientMonitor newClient, boolean initiatedByClient) {
ClientMonitor currentClient = mCurrentClient;
if (currentClient != null) {
if (DEBUG) Slog.v(getTag(), "request stop current client " +
currentClient.getOwnerString());
// This check only matters for FingerprintService, since enumerate may call back
// multiple times.
if (currentClient instanceof InternalEnumerateClient
|| currentClient instanceof InternalRemovalClient) {
// This condition means we're currently running internal diagnostics to
// remove extra templates in the hardware and/or the software
// TODO: design an escape hatch in case client never finishes
if (newClient != null) {
Slog.w(getTag(), "Internal cleanup in progress but trying to start client "
+ newClient.getClass().getSuperclass().getSimpleName()
+ "(" + newClient.getOwnerString() + ")"
+ ", initiatedByClient = " + initiatedByClient);
}
} else {
currentClient.stop(initiatedByClient);
// Only post the reset runnable for non-cleanup clients. Cleanup clients should
// never be forcibly stopped since they ensure synchronization between HAL and
// framework. Thus, we should instead just start the pending client once cleanup
// finishes instead of using the reset runnable.
mHandler.removeCallbacks(mResetClientState);
mHandler.postDelayed(mResetClientState, CANCEL_TIMEOUT_LIMIT);
}
mPendingClient = newClient;
} else if (newClient != null) {
// For BiometricPrompt clients, do not start until
// <Biometric>Service#startPreparedClient is called. BiometricService waits until all
// modalities are ready before initiating authentication.
if (newClient instanceof AuthenticationClient) {
AuthenticationClient client = (AuthenticationClient) newClient;
if (client.isBiometricPrompt()) {
if (DEBUG) Slog.v(getTag(), "Returning cookie: " + client.getCookie());
mCurrentClient = newClient;
if (mBiometricService == null) {
mBiometricService = IBiometricService.Stub.asInterface(
ServiceManager.getService(Context.BIOMETRIC_SERVICE));
}
try {
mBiometricService.onReadyForAuthentication(client.getCookie(),
client.getRequireConfirmation(), client.getTargetUserId());
} catch (RemoteException e) {
Slog.e(getTag(), "Remote exception", e);
}
return;
}
}
// We are not a BiometricPrompt client, start the client immediately
mCurrentClient = newClient;
/*重点关注*/
startCurrentClient(mCurrentClient.getCookie());
//这里继续将AuthenticationClient传递进去
}
}
startCurrentClient(mCurrentClient.getCookie());
protected void startCurrentClient(int cookie) {
if (mCurrentClient == null) {
Slog.e(getTag(), "Trying to start null client!");
return;
}
if (DEBUG) Slog.v(getTag(), "starting client "
+ mCurrentClient.getClass().getSuperclass().getSimpleName()
+ "(" + mCurrentClient.getOwnerString() + ")"
+ " cookie: " + cookie + "/" + mCurrentClient.getCookie());
if (cookie != mCurrentClient.getCookie()) {
Slog.e(getTag(), "Mismatched cookie");
return;
}
notifyClientActiveCallbacks(true);
/*重点关注*/
mCurrentClient.start();
//这里调用的是AuthenticationClient的start方法
}
frameworks/base/services/core/java/com/android/server/biometrics/AuthenticationClient.java
public int start() {
mStarted = true;
onStart();
try {
/*重点关注*/
final int result = getDaemonWrapper().authenticate(mOpId, getGroupId());
if (result != 0) {
Slog.w(getLogTag(), "startAuthentication failed, result=" + result);
mMetricsLogger.histogram(mConstants.tagAuthStartError(), result);
onError(getHalDeviceId(), BiometricConstants.BIOMETRIC_ERROR_HW_UNAVAILABLE,
0 /* vendorCode */);
return result;
}
if (DEBUG) Slog.w(getLogTag(), "client " + getOwnerString() + " is authenticating...");
} catch (RemoteException e) {
Slog.e(getLogTag(), "startAuthentication failed", e);
return ERROR_ESRCH;
}
return 0; // success
}
start方法会调用faced，调用底层的人脸库，底层库返回结果后会调用onAuthenticated来反馈结果给receiver，在往上层反馈
五、人脸解锁屏幕
frameworks/base/services/core/java/com/android/server/biometrics/AuthenticationClient.java
public boolean onAuthenticated(BiometricAuthenticator.Identifier identifier,
boolean authenticated, ArrayList<Byte> token) {
super.logOnAuthenticated(getContext(), authenticated, mRequireConfirmation,
getTargetUserId(), isBiometricPrompt());
final BiometricServiceBase.ServiceListener listener = getListener();
mMetricsLogger.action(mConstants.actionBiometricAuth(), authenticated);
boolean result = false;
try {
if (DEBUG) Slog.v(getLogTag(), "onAuthenticated(" + authenticated + ")"
+ ", ID:" + identifier.getBiometricId()
+ ", Owner: " + getOwnerString()
+ ", isBP: " + isBiometricPrompt()
+ ", listener: " + listener
+ ", requireConfirmation: " + mRequireConfirmation
+ ", user: " + getTargetUserId());
if (authenticated) {
mAlreadyDone = true;
if (listener != null) {
vibrateSuccess();
}
result = true;
if (shouldFrameworkHandleLockout()) {
resetFailedAttempts();
}
onStop();
final byte[] byteToken = new byte[token.size()];
for (int i = 0; i < token.size(); i++) {
byteToken[i] = token.get(i);
}
if (isBiometricPrompt() && listener != null) {
// BiometricService will add the token to keystore
listener.onAuthenticationSucceededInternal(mRequireConfirmation, byteToken);
} else if (!isBiometricPrompt() && listener != null) {
KeyStore.getInstance().addAuthToken(byteToken);
try {
// Explicitly have if/else here to make it super obvious in case the code is
// touched in the future.
if (!getIsRestricted()) {
/*重点关注*/
listener.onAuthenticationSucceeded(
getHalDeviceId(), identifier, getTargetUserId());
} else {
listener.onAuthenticationSucceeded(
getHalDeviceId(), null, getTargetUserId());
}
} catch (RemoteException e) {
Slog.e(getLogTag(), "Remote exception", e);
}
} else {
// Client not listening
Slog.w(getLogTag(), "Client not listening");
result = true;
}
} else {
if (listener != null) {
vibrateError();
}
// Allow system-defined limit of number of attempts before giving up
final int lockoutMode = handleFailedAttempt();
if (lockoutMode != LOCKOUT_NONE && shouldFrameworkHandleLockout()) {
Slog.w(getLogTag(), "Forcing lockout (driver code should do this!), mode("
+ lockoutMode + ")");
stop(false);
final int errorCode = lockoutMode == LOCKOUT_TIMED
? BiometricConstants.BIOMETRIC_ERROR_LOCKOUT
: BiometricConstants.BIOMETRIC_ERROR_LOCKOUT_PERMANENT;
onError(getHalDeviceId(), errorCode, 0 /* vendorCode */);
} else {
// Don't send onAuthenticationFailed if we're in lockout, it causes a
// janky UI on Keyguard/BiometricPrompt since "authentication failed"
// will show briefly and be replaced by "device locked out" message.
if (listener != null) {
if (isBiometricPrompt()) {
listener.onAuthenticationFailedInternal(getCookie(),
getRequireConfirmation());
} else {
listener.onAuthenticationFailed(getHalDeviceId());
}
}
}
result = lockoutMode != LOCKOUT_NONE; // in a lockout mode
}
} catch (RemoteException e) {
Slog.e(getLogTag(), "Remote exception", e);
result = true;
}
return result;
}
frameworks/base/services/core/java/com/android/server/biometrics/BiometricServiceBase.java
protected interface ServiceListener {
default void onEnrollResult(BiometricAuthenticator.Identifier identifier,
int remaining) throws RemoteException {};
void onAcquired(long deviceId, int acquiredInfo, int vendorCode) throws RemoteException;
/*重点关注*/
default void onAuthenticationSucceeded(long deviceId,
BiometricAuthenticator.Identifier biometric, int userId) throws RemoteException {
throw new UnsupportedOperationException("Stub!");
}
default void onAuthenticationSucceededInternal(boolean requireConfirmation, byte[] token)
throws RemoteException {
throw new UnsupportedOperationException("Stub!");
}
default void onAuthenticationFailed(long deviceId) throws RemoteException {
throw new UnsupportedOperationException("Stub!");
}
default void onAuthenticationFailedInternal(int cookie, boolean requireConfirmation)
throws RemoteException {
throw new UnsupportedOperationException("Stub!");
}
void onError(long deviceId, int error, int vendorCode, int cookie) throws RemoteException;
default void onRemoved(BiometricAuthenticator.Identifier identifier,
int remaining) throws RemoteException {};
default void onEnumerated(BiometricAuthenticator.Identifier identifier,
int remaining) throws RemoteException {};
}
onAuthenticationSucceeded
/**
* Wraps the callback interface from Service -> BiometricPrompt
*/
protected abstract class BiometricServiceListener implements ServiceListener {
private IBiometricServiceReceiverInternal mWrapperReceiver;
public BiometricServiceListener(IBiometricServiceReceiverInternal wrapperReceiver) {
mWrapperReceiver = wrapperReceiver;
}
public IBiometricServiceReceiverInternal getWrapperReceiver() {
return mWrapperReceiver;
}
@Override
public void onAuthenticationSucceededInternal(boolean requireConfirmation, byte[] token)
throws RemoteException {
if (getWrapperReceiver() != null) {
/*重点关注*/
getWrapperReceiver().onAuthenticationSucceeded(requireConfirmation, token);
}
}
@Override
public void onAuthenticationFailedInternal(int cookie, boolean requireConfirmation)
throws RemoteException {
if (getWrapperReceiver() != null) {
getWrapperReceiver().onAuthenticationFailed(cookie, requireConfirmation);
}
}
}
frameworks/base/core/java/android/hardware/face/FaceManager.java
private IFaceServiceReceiver mServiceReceiver = new IFaceServiceReceiver.Stub() {
......
@Override // binder call
public void onAuthenticationSucceeded(long deviceId, Face face, int userId) {
/*重点关注*/
mHandler.obtainMessage(MSG_AUTHENTICATION_SUCCEEDED, userId, 0, face).sendToTarget();
}
MSG_AUTHENTICATION_SUCCEEDED
case MSG_AUTHENTICATION_SUCCEEDED:
/*重点关注*/
sendAuthenticatedSucceeded((Face) msg.obj, msg.arg1 /* userId */);
break;
sendAuthenticatedSucceeded
private void sendAuthenticatedSucceeded(Face face, int userId) {
if (mAuthenticationCallback != null) {
final AuthenticationResult result =
new AuthenticationResult(mCryptoObject, face, userId);
/*重点关注*/
mAuthenticationCallback.onAuthenticationSucceeded(result);
}
}
AuthenticationCallback是Fm的一个内部回调接口
public abstract static class AuthenticationCallback
extends BiometricAuthenticator.AuthenticationCallback {
/**
* Called when an unrecoverable error has been encountered and the operation is complete.
* No further callbacks will be made on this object.
*
* @param errorCode An integer identifying the error message
* @param errString A human-readable error string that can be shown in UI
*/
public void onAuthenticationError(int errorCode, CharSequence errString) {
}
/**
* Called when a recoverable error has been encountered during authentication. The help
* string is provided to give the user guidance for what went wrong, such as
* "Sensor dirty, please clean it."
*
* @param helpCode An integer identifying the error message
* @param helpString A human-readable string that can be shown in UI
*/
public void onAuthenticationHelp(int helpCode, CharSequence helpString) {
}
/**
* Called when a face is recognized.
*
* @param result An object containing authentication-related data
*/
/*重点关注*/
public void onAuthenticationSucceeded(AuthenticationResult result) {
}
/**
* Called when a face is detected but not recognized.
*/
public void onAuthenticationFailed() {
}
/**
* Called when a face image has been acquired, but wasn't processed yet.
*
* @param acquireInfo one of FACE_ACQUIRED_* constants
* @hide
*/
public void onAuthenticationAcquired(int acquireInfo) {
}
}
frameworks/base/packages/SystemUI/src/com/android/keyguard/KeyguardUpdateMonitor.java
AuthenticationCallback接口在KeyguardUpdateMonitor.java中实现，用于监听FaceService中人脸的解锁状态
@VisibleForTesting
FaceManager.AuthenticationCallback mFaceAuthenticationCallback
= new FaceManager.AuthenticationCallback() {
@Override
public void onAuthenticationFailed() {
handleFaceAuthFailed();
}
@Override
public void onAuthenticationSucceeded(FaceManager.AuthenticationResult result) {
Trace.beginSection("KeyguardUpdateMonitor#onAuthenticationSucceeded");
/*重点关注*/
handleFaceAuthenticated(result.getUserId());
Trace.endSection();
}
@Override
public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
handleFaceHelp(helpMsgId, helpString.toString());
}
@Override
public void onAuthenticationError(int errMsgId, CharSequence errString) {
handleFaceError(errMsgId, errString.toString());
}
@Override
public void onAuthenticationAcquired(int acquireInfo) {
handleFaceAcquired(acquireInfo);
}
};
handleFaceAuthenticated
private void handleFaceAuthenticated(int authUserId) {
Trace.beginSection("KeyGuardUpdateMonitor#handlerFaceAuthenticated");
try {
final int userId;
try {
userId = ActivityManager.getService().getCurrentUser().id;
} catch (RemoteException e) {
Log.e(TAG, "Failed to get current user id: ", e);
return;
}
if (userId != authUserId) {
Log.d(TAG, "Face authenticated for wrong user: " + authUserId);
return;
}
if (isFaceDisabled(userId)) {
Log.d(TAG, "Face authentication disabled by DPM for userId: " + userId);
return;
}
/*重点关注*/
onFaceAuthenticated(userId);
} finally {
setFaceRunningState(BIOMETRIC_STATE_STOPPED);
}
Trace.endSection();
}
onFaceAuthenticated(userId)
protected void onFaceAuthenticated(int userId) {
Trace.beginSection("KeyGuardUpdateMonitor#onFaceAuthenticated");
mUserFaceAuthenticated.put(userId, true);
// Update/refresh trust state only if user can skip bouncer
if (getUserCanSkipBouncer(userId)) {
mTrustManager.unlockedByBiometricForUser(userId, BiometricSourceType.FACE);
}
// Don't send cancel if authentication succeeds
mFaceCancelSignal = null;
for (int i = 0; i < mCallbacks.size(); i++) {
/*重点关注*/
KeyguardUpdateMonitorCallback cb = mCallbacks.get(i).get();
if (cb != null) {
/*重点关注*/
cb.onBiometricAuthenticated(userId,
BiometricSourceType.FACE);
}
}
mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_BIOMETRIC_AUTHENTICATION_CONTINUE),
BIOMETRIC_CONTINUE_DELAY_MS);
// Only authenticate face once when assistant is visible
mAssistantVisible = false;
Trace.endSection();
}
这里开始调用接口将解锁成功消息层层传递直至keyguard解锁，与指纹解锁逻辑一致
可以看到在onFaceAuthenticated(userId)方法中调用了KeyguardUpdateMonitorCallback这个抽象类的onBiometricAuthenticated()抽象方法，而BiometricUnlockController extends KeyguardUpdateMonitorCallback，并注册了回调mUpdateMonitor.registerCallback(this)
frameworks/base/packages/SystemUI/src/com/android/keyguard/KeyguardUpdateMonitorCallback.java
/**
* Called when a biometric is recognized.
* @param userId the user id for which the biometric sample was authenticated
* @param biometricSourceType
*/
/*重点关注*/
public void onBiometricAuthenticated(int userId, BiometricSourceType biometricSourceType) { }
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/BiometricUnlockController.java
@Override
public void onBiometricAuthenticated(int userId, BiometricSourceType biometricSourceType) {
Trace.beginSection("BiometricUnlockController#onBiometricAuthenticated");
if (mUpdateMonitor.isGoingToSleep()) {
mPendingAuthenticatedUserId = userId;
mPendingAuthenticatedBioSourceType = biometricSourceType;
Trace.endSection();
return;
}
mMetricsLogger.write(new LogMaker(MetricsEvent.BIOMETRIC_AUTH)
.setType(MetricsEvent.TYPE_SUCCESS).setSubtype(toSubtype(biometricSourceType)));
/*重点关注*/
startWakeAndUnlock(calculateMode(biometricSourceType));
}
startWakeAndUnlock(calculateMode(biometricSourceType));
public void startWakeAndUnlock(int mode) {
// TODO(b/62444020): remove when this bug is fixed
Log.v(TAG, "startWakeAndUnlock(" + mode + ")");
boolean wasDeviceInteractive = mUpdateMonitor.isDeviceInteractive();
mMode = mode;
mHasScreenTurnedOnSinceAuthenticating = false;
if (mMode == MODE_WAKE_AND_UNLOCK_PULSING && pulsingOrAod()) {
// If we are waking the device up while we are pulsing the clock and the
// notifications would light up first, creating an unpleasant animation.
// Defer changing the screen brightness by forcing doze brightness on our window
// until the clock and the notifications are faded out.
mStatusBarWindowController.setForceDozeBrightness(true);
}
// During wake and unlock, we need to draw black before waking up to avoid abrupt
// brightness changes due to display state transitions.
boolean alwaysOnEnabled = DozeParameters.getInstance(mContext).getAlwaysOn();
boolean delayWakeUp = mode == MODE_WAKE_AND_UNLOCK && alwaysOnEnabled && mWakeUpDelay > 0;
Runnable wakeUp = ()-> {
if (!wasDeviceInteractive) {
if (DEBUG_BIO_WAKELOCK) {
Log.i(TAG, "bio wakelock: Authenticated, waking up...");
}
mPowerManager.wakeUp(SystemClock.uptimeMillis(), PowerManager.WAKE_REASON_GESTURE,
"android.policy:BIOMETRIC");
}
if (delayWakeUp) {
/*重点关注*/
mKeyguardViewMediator.onWakeAndUnlocking();
}
Trace.beginSection("release wake-and-unlock");
releaseBiometricWakeLock();
Trace.endSection();
};
if (!delayWakeUp) {
wakeUp.run();
}
switch (mMode) {
case MODE_DISMISS_BOUNCER:
Trace.beginSection("MODE_DISMISS");
mStatusBarKeyguardViewManager.notifyKeyguardAuthenticated(
false /* strongAuth */);
Trace.endSection();
break;
case MODE_UNLOCK:
case MODE_SHOW_BOUNCER:
Trace.beginSection("MODE_UNLOCK or MODE_SHOW_BOUNCER");
if (!wasDeviceInteractive) {
mPendingShowBouncer = true;
} else {
showBouncer();
}
Trace.endSection();
break;
case MODE_WAKE_AND_UNLOCK_FROM_DREAM:
case MODE_WAKE_AND_UNLOCK_PULSING:
case MODE_WAKE_AND_UNLOCK:
if (mMode == MODE_WAKE_AND_UNLOCK_PULSING) {
Trace.beginSection("MODE_WAKE_AND_UNLOCK_PULSING");
mMediaManager.updateMediaMetaData(false /* metaDataChanged */,
true /* allowEnterAnimation */);
} else if (mMode == MODE_WAKE_AND_UNLOCK){
Trace.beginSection("MODE_WAKE_AND_UNLOCK");
} else {
Trace.beginSection("MODE_WAKE_AND_UNLOCK_FROM_DREAM");
mUpdateMonitor.awakenFromDream();
}
mStatusBarWindowController.setStatusBarFocusable(false);
if (delayWakeUp) {
mHandler.postDelayed(wakeUp, mWakeUpDelay);
} else {
mKeyguardViewMediator.onWakeAndUnlocking();
}
if (mStatusBar.getNavigationBarView() != null) {
mStatusBar.getNavigationBarView().setWakeAndUnlocking(true);
}
Trace.endSection();
break;
case MODE_ONLY_WAKE:
case MODE_NONE:
break;
}
mStatusBar.notifyBiometricAuthModeChanged();
Trace.endSection();
}
frameworks/base/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java
public void onWakeAndUnlocking() {
Trace.beginSection("KeyguardViewMediator#onWakeAndUnlocking");
mWakeAndUnlocking = true;
/*重点关注*/
keyguardDone();
Trace.endSection();
}
keyguardDone();
public void keyguardDone() {
Trace.beginSection("KeyguardViewMediator#keyguardDone");
if (DEBUG) Log.d(TAG, "keyguardDone()");
userActivity();
EventLog.writeEvent(70000, 2);
/*重点关注*/
Message msg = mHandler.obtainMessage(KEYGUARD_DONE);
mHandler.sendMessage(msg);
Trace.endSection();
}
KEYGUARD_DONE
case KEYGUARD_DONE:
Trace.beginSection("KeyguardViewMediator#handleMessage KEYGUARD_DONE");
/*重点关注*/
handleKeyguardDone();
Trace.endSection();
break;
handleKeyguardDone();
private void handleKeyguardDone() {
Trace.beginSection("KeyguardViewMediator#handleKeyguardDone");
final int currentUser = KeyguardUpdateMonitor.getCurrentUser();
mUiOffloadThread.submit(() -> {
if (mLockPatternUtils.isSecure(currentUser)) {
mLockPatternUtils.getDevicePolicyManager().reportKeyguardDismissed(currentUser);
}
});
if (DEBUG) Log.d(TAG, "handleKeyguardDone");
synchronized (this) {
resetKeyguardDonePendingLocked();
}
mUpdateMonitor.clearBiometricRecognized();
if (mGoingToSleep) {
Log.i(TAG, "Device is going to sleep, aborting keyguardDone");
return;
}
if (mExitSecureCallback != null) {
try {
mExitSecureCallback.onKeyguardExitResult(true /* authenciated */);
} catch (RemoteException e) {
Slog.w(TAG, "Failed to call onKeyguardExitResult()", e);
}
mExitSecureCallback = null;
// after succesfully exiting securely, no need to reshow
// the keyguard when they've released the lock
mExternallyEnabled = true;
mNeedToReshowWhenReenabled = false;
updateInputRestricted();
}
/*重点关注*/
handleHide();
Trace.endSection();
}
handleHide();
private void handleHide() {
Trace.beginSection("KeyguardViewMediator#handleHide");
// It's possible that the device was unlocked in a dream state. It's time to wake up.
if (mAodShowing) {
PowerManager pm = mContext.getSystemService(PowerManager.class);
pm.wakeUp(SystemClock.uptimeMillis(), PowerManager.WAKE_REASON_GESTURE,
"com.android.systemui:BOUNCER_DOZING");
}
synchronized (KeyguardViewMediator.this) {
if (DEBUG) Log.d(TAG, "handleHide");
if (mustNotUnlockCurrentUser()) {
// In split system user mode, we never unlock system user. The end user has to
// switch to another user.
// TODO: We should stop it early by disabling the swipe up flow. Right now swipe up
// still completes and makes the screen blank.
if (DEBUG) Log.d(TAG, "Split system user, quit unlocking.");
return;
}
mHiding = true;
if (mShowing && !mOccluded) {
mKeyguardGoingAwayRunnable.run();
} else {
/*重点关注*/
handleStartKeyguardExitAnimation(
SystemClock.uptimeMillis() + mHideAnimation.getStartOffset(),
mHideAnimation.getDuration());
}
}
Trace.endSection();
}
handleHide();
private void handleHide() {
Trace.beginSection("KeyguardViewMediator#handleHide");
// It's possible that the device was unlocked in a dream state. It's time to wake up.
if (mAodShowing) {
PowerManager pm = mContext.getSystemService(PowerManager.class);
pm.wakeUp(SystemClock.uptimeMillis(), PowerManager.WAKE_REASON_GESTURE,
"com.android.systemui:BOUNCER_DOZING");
}
synchronized (KeyguardViewMediator.this) {
if (DEBUG) Log.d(TAG, "handleHide");
if (mustNotUnlockCurrentUser()) {
// In split system user mode, we never unlock system user. The end user has to
// switch to another user.
// TODO: We should stop it early by disabling the swipe up flow. Right now swipe up
// still completes and makes the screen blank.
if (DEBUG) Log.d(TAG, "Split system user, quit unlocking.");
return;
}
mHiding = true;
if (mShowing && !mOccluded) {
mKeyguardGoingAwayRunnable.run();
} else {
/*重点关注*/
handleStartKeyguardExitAnimation(
SystemClock.uptimeMillis() + mHideAnimation.getStartOffset(),
mHideAnimation.getDuration());
}
}
Trace.endSection();
}
handleStartKeyguardExitAnimation
private void handleStartKeyguardExitAnimation(long startTime, long fadeoutDuration) {
Trace.beginSection("KeyguardViewMediator#handleStartKeyguardExitAnimation");
if (DEBUG) Log.d(TAG, "handleStartKeyguardExitAnimation startTime=" + startTime
+ " fadeoutDuration=" + fadeoutDuration);
synchronized (KeyguardViewMediator.this) {
if (!mHiding) {
// Tell ActivityManager that we canceled the keyguardExitAnimation.
setShowingLocked(mShowing, mAodShowing, true /* force */);
return;
}
mHiding = false;
if (mWakeAndUnlocking && mDrawnCallback != null) {
// Hack level over 9000: To speed up wake-and-unlock sequence, force it to report
// the next draw from here so we don't have to wait for window manager to signal
// this to our ViewRootImpl.
mStatusBarKeyguardViewManager.getViewRootImpl().setReportNextDraw();
notifyDrawn(mDrawnCallback);
mDrawnCallback = null;
}
// only play "unlock" noises if not on a call (since the incall UI
// disables the keyguard)
if (TelephonyManager.EXTRA_STATE_IDLE.equals(mPhoneState)) {
playSounds(false);
}
mWakeAndUnlocking = false;
setShowingLocked(false, mAodShowing);
mDismissCallbackRegistry.notifyDismissSucceeded();
/*重点关注*/
mStatusBarKeyguardViewManager.hide(startTime, fadeoutDuration);
resetKeyguardDonePendingLocked();
mHideAnimationRun = false;
adjustStatusBarLocked();
sendUserPresentBroadcast();
}
Trace.endSection();
}
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManager.java
/**
* Hides the keyguard view
*/
public void hide(long startTime, long fadeoutDuration) {
mShowing = false;
mKeyguardMonitor.notifyKeyguardState(
mShowing, mKeyguardMonitor.isSecure(), mKeyguardMonitor.isOccluded());
launchPendingWakeupAction();
if (KeyguardUpdateMonitor.getInstance(mContext).needsSlowUnlockTransition()) {
fadeoutDuration = KEYGUARD_DISMISS_DURATION_LOCKED;
}
long uptimeMillis = SystemClock.uptimeMillis();
long delay = Math.max(0, startTime + HIDE_TIMING_CORRECTION_MS - uptimeMillis);
if (mStatusBar.isInLaunchTransition() ) {
mStatusBar.fadeKeyguardAfterLaunchTransition(new Runnable() {
@Override
public void run() {
mStatusBarWindowController.setKeyguardShowing(false);
mStatusBarWindowController.setKeyguardFadingAway(true);
hideBouncer(true /* destroyView */);
updateStates();
}
}, new Runnable() {
@Override
public void run() {
mStatusBar.hideKeyguard();
mStatusBarWindowController.setKeyguardFadingAway(false);
mViewMediatorCallback.keyguardGone();
executeAfterKeyguardGoneAction();
}
});
} else {
executeAfterKeyguardGoneAction();
boolean wakeUnlockPulsing =
mBiometricUnlockController.getMode() == MODE_WAKE_AND_UNLOCK_PULSING;
if (wakeUnlockPulsing) {
delay = 0;
fadeoutDuration = 240;
}
mStatusBar.setKeyguardFadingAway(startTime, delay, fadeoutDuration);
mBiometricUnlockController.startKeyguardFadingAway();
/*重点关注*/
hideBouncer(true /* destroyView */);
if (wakeUnlockPulsing) {
mStatusBar.fadeKeyguardWhilePulsing();
wakeAndUnlockDejank();
} else {
boolean staying = mStatusBar.hideKeyguard();
if (!staying) {
mStatusBarWindowController.setKeyguardFadingAway(true);
// hide() will happen asynchronously and might arrive after the scrims
// were already hidden, this means that the transition callback won't
// be triggered anymore and StatusBarWindowController will be forever in
// the fadingAway state.
mStatusBar.updateScrimController();
wakeAndUnlockDejank();
} else {
mStatusBar.finishKeyguardFadingAway();
mBiometricUnlockController.finishKeyguardFadingAway();
}
}
updateStates();
mStatusBarWindowController.setKeyguardShowing(false);
mViewMediatorCallback.keyguardGone();
}
StatsLog.write(StatsLog.KEYGUARD_STATE_CHANGED,
StatsLog.KEYGUARD_STATE_CHANGED__STATE__HIDDEN);
}
hideBouncer
private void hideBouncer(boolean destroyView) {
if (mBouncer == null) {
return;
}
/*重点关注*/
mBouncer.hide(destroyView);
cancelPendingWakeupAction();
}
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/KeyguardBouncer.java
public void hide(boolean destroyView) {
if (isShowing()) {
StatsLog.write(StatsLog.KEYGUARD_BOUNCER_STATE_CHANGED,
StatsLog.KEYGUARD_BOUNCER_STATE_CHANGED__STATE__HIDDEN);
mDismissCallbackRegistry.notifyDismissCancelled();
}
mIsScrimmed = false;
mFalsingManager.onBouncerHidden();
mCallback.onBouncerVisiblityChanged(false /* shown */);
cancelShowRunnable();
if (mKeyguardView != null) {
mKeyguardView.cancelDismissAction();
mKeyguardView.cleanUp();
}
mIsAnimatingAway = false;
if (mRoot != null) {
mRoot.setVisibility(View.INVISIBLE);
if (destroyView) {
// We have a ViewFlipper that unregisters a broadcast when being detached, which may
// be slow because of AM lock contention during unlocking. We can delay it a bit.
/*重点关注*/
mHandler.postDelayed(mRemoveViewRunnable, 50);
}
}
}
mRemoveViewRunnable
private final Runnable mRemoveViewRunnable = this::removeView;
protected void removeView() {
if (mRoot != null && mRoot.getParent() == mContainer) {
/*重点关注*/
mContainer.removeView(mRoot);
mRoot = null;
}
}
至此锁屏界面移除的逻辑基本clear
原文链接：https://blog.csdn.net/Easyhood/article/details/104353983
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