Fingerprint 亮灭屏监听

frameworks\base\packages\Keyguard\src\com\android\keyguard\KeyguardUpdateMonitor.java

protected void handleStartedGoingToSleep(int arg1) {    clearFingerprintRecognized();    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;    mFingerprintAlreadyAuthenticated = false;    updateFingerprintListeningState();}

private void updateFingerprintListeningState() {    boolean shouldListenForFingerprint = shouldListenForFingerprint();    if (mFingerprintRunningState == FINGERPRINT_STATE_RUNNING && !shouldListenForFingerprint) {        stopListeningForFingerprint();    } else if (mFingerprintRunningState != FINGERPRINT_STATE_RUNNING            && shouldListenForFingerprint) {        startListeningForFingerprint();          // 指纹监听    }}

  private boolean shouldListenForFingerprint() {      return (mKeyguardIsVisible || !mDeviceInteractive || mBouncer || mGoingToSleep|| (mOccluded && !mUserFingerprintAuthenticated.get(getCurrentUser())))              && !mSwitchingUser && !mFingerprintAlreadyAuthenticated              && !isFingerprintDisabled(getCurrentUser());  }

// mGoingToSleep 为true 且 mFingerprintAlreadyAuthenticated 为false ，灭屏进入睡眠进入监听指纹触摸事件

frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\StatusBarKeyguardViewManager.java

public void updateStates() {

if (bouncerShowing != mLastBouncerShowing || mFirstUpdate) {                    //PIN码或手势解锁界面显示与消失    Log.d(TAG, "updateStates() - setBouncerShowing(" + bouncerShowing + ")") ;    mStatusBarWindowManager.setBouncerShowing(bouncerShowing);    mPhoneStatusBar.setBouncerShowing(bouncerShowing);    mScrimController.setBouncerShowing(bouncerShowing);}KeyguardUpdateMonitor updateMonitor = KeyguardUpdateMonitor.getInstance(mContext);if ((showing && !occluded) != (mLastShowing && !mLastOccluded) || mFirstUpdate) {    //keyguard 显示与消失    updateMonitor.onKeyguardVisibilityChanged(showing && !occluded);}if (bouncerShowing != mLastBouncerShowing || mFirstUpdate) {    updateMonitor.sendKeyguardBouncerChanged(bouncerShowing);}

}

/** * Notifies that the visibility state of Keyguard has changed. * * <p>Needs to be called from the main thread. */public void onKeyguardVisibilityChanged(boolean showing) {    if (DEBUG) Log.d(TAG, "onKeyguardVisibilityChanged(" + showing + ")");    mKeyguardIsVisible = showing;    for (int i = 0; i < mCallbacks.size(); i++) {        KeyguardUpdateMonitorCallback cb = mCallbacks.get(i).get();        if (cb != null) {            cb.onKeyguardVisibilityChangedRaw(showing);        }    }    if (!showing) {        mFingerprintAlreadyAuthenticated = false;    //亮屏keyguard 消失，设置为false,当灭屏时就可以监听指纹，并再次被设置为true.    }    updateFingerprintListeningState();}

/** * Dismisses the keyguard by going to the next screen or making it gone. */public void dismiss() {    dismiss(false);}

亮屏，从keyguard 切换到输入pin/手势码界面调用， keyguard 界面-》bouncer 界面

或者亮屏在指纹解锁会调用。  keyguard 界面-》laucher界面。