五、指纹的解锁流程
指纹解锁的核心类FingerprintUnlockController，实现了KeyguardUpdateMonitorCallback
public class FingerprintUnlockController extends KeyguardUpdateMonitorCallback {
@Override
public void onFingerprintAuthenticated(int userId) {
......
switch (mMode) {
case MODE_DISMISS_BOUNCER://亮屏并且出现图案锁
mStatusBarKeyguardViewManager.notifyKeyguardAuthenticated(
false /* strongAuth */);
break;
case MODE_UNLOCK://亮屏不出现图案锁
if (!wasDeviceInteractive) {
mStatusBarKeyguardViewManager.notifyDeviceWakeUpRequested();
}
mStatusBarKeyguardViewManager.animateCollapsePanels(
FINGERPRINT_COLLAPSE_SPEEDUP_FACTOR);
break;
......
case MODE_WAKE_AND_UNLOCK://息屏锁屏解锁
mStatusBarWindowManager.setStatusBarFocusable(false);
mDozeScrimController.abortPulsing();
mKeyguardViewMediator.onWakeAndUnlocking();
mScrimController.setWakeAndUnlocking();
if (mPhoneStatusBar.getNavigationBarView() != null) {
mPhoneStatusBar.getNavigationBarView().setWakeAndUnlocking(true);
}
break;
......
case MODE_DISMISS_KEYGUARD://通话界面息屏解锁
mStatusBarWindowManager.setStatusBarFocusable(false);
mKeyguardViewMediator.onWakeAndUnlocking();
if (mPhoneStatusBar.getNavigationBarView() != null) {
mPhoneStatusBar.getNavigationBarView().setWakeAndUnlocking(true);
}
break;
}
......
}
@Override
public void onFinishedGoingToSleep(int why) {
......
}
@Override
public void onFingerprintAuthFailed() {
cleanup();
}
@Override
public void onFingerprintError(int msgId, String errString) {
cleanup();
if(Settings.Global.getInt(mContext.getContentResolver(),"persist.fg.errorshow",0) == 0){
if(!mPowerManager.isScreenOn()){
mPowerManager.wakeUp(SystemClock.uptimeMillis());
}else {
mStatusBarKeyguardViewManager.animateCollapsePanels(
FINGERPRINT_COLLAPSE_SPEEDUP_FACTOR);
}
Settings.Global.putInt(mContext.getContentResolver(),"persist.fg.errorshow",1);
}
}
KeyguardUpdateMonitor类为解锁屏模块的监听者，它负责监听时间、sim卡、运营商信息、电池信息、电话信息等状态的变化，并通知keyguard View模块更新显示。这个类里面还有有监听指纹的方法startListeningForFingerprint, 该方法调用了FingerprintManager的authenticate()方法并且参数中传入了AuthenticationCallback对象，AuthenticationCallback类中调用了KeyguardUpdateMonitorCallback的方法，FingerprintUnlockController实现了KeyguardUpdateMonitorCallback这样就能实现指纹解锁。
private void startListeningForFingerprint() {
......
//调用了FingerprintManager的authenticate()方法
mFpm.authenticate(null, mFingerprintCancelSignal, 0,
mAuthenticationCallback, null, userId);
......
}
private FingerprintManager.AuthenticationCallback mAuthenticationCallback
= new AuthenticationCallback() {
//指纹匹配失败（没超过5次）
@Override
public void onAuthenticationFailed() {
handleFingerprintAuthFailed();
};
//指纹匹配成功
@Override
public void onAuthenticationSucceeded(AuthenticationResult result) {
handleFingerprintAuthenticated(result.getUserId());
}
//指纹匹配提示
@Override
public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
handleFingerprintHelp(helpMsgId, helpString.toString());
}
//指纹匹配错误（匹配失败次数超过5次）
@Override
public void onAuthenticationError(int errMsgId, CharSequence errString) {
handleFingerprintError(errMsgId, errString.toString());
}
//获得到指纹
@Override
public void onAuthenticationAcquired(int acquireInfo) {
if(Settings.Global.getInt(mContext.getContentResolver(),"persist.
fg.errorshow",0) == 1){
Settings.Global.putInt(mContext.getContentResolver(),"persist
.fg.errorshow",0);
}
handleFingerprintAcquired(acquireInfo);
}
};
private void handleFingerprintAuthenticated(int authUserId) {
......
onFingerprintAuthenticated(userId);
......
private void onFingerprintAuthenticated(int userId) {
mUserFingerprintAuthenticated.put(userId, true);
......
for (int i = 0; i < mCallbacks.size(); i++) {
KeyguardUpdateMonitorCallback cb = mCallbacks.get(i).get();
if (cb != null) {
//这里会调用FingerprintUnLockController中的onFingerprintAuthenticated方法处理解锁
cb.onFingerprintAuthenticated(userId);
}
}
.....
}
回来继续看FingerprintManager的authenticate()方法，此方法继续调用了FingerprintServiceWarpper的authenticate方法（FingerprintManager与FingerprintService直接通过aidl来通信）。
public void authenticate(@Nullable CryptoObject crypto, @Nullable
......
mService.authenticate(mToken, sessionId, userId, mServiceReceiver,
flags,mContext.getOpPackageName());
......
}
private final class FingerprintServiceWrapper extends IFingerprintService.Stub {
@Override // Binder call
public void authenticate(final IBinder token, final long opId,
final int groupId,final IFingerprintServiceReceiver receiver,
final int flags,final String opPackageName) {
startAuthentication(token, opId, callingUserId, groupId,
receiver, flags, restricted, opPackageName);
}
startAuthentication方法会调用AuthenticationClient的start方法，AuthenticationClient
是为给定的客户端跟踪指纹认证状态。
public abstract class AuthenticationClient extends ClientMonitor {
public AuthenticationClient(Context context, long halDeviceId, IBinder token,
IFingerprintServiceReceiver receiver, int targetUserId,
int groupId, long opId,boolean restricted, String owner) {
super(context, halDeviceId, token, receiver, targetUserId,
groupId, restricted, owner);
}
//指纹库处理结果调用
@Override
public boolean onAuthenticated(int fingerId, int groupId) {
......
boolean authenticated = fingerId != 0;
if (!authenticated) {
//认证失败
receiver.onAuthenticationFailed(getHalDeviceId());
} else {
//认证成功
receiver.onAuthenticationSucceeded(getHalDeviceId(), fp, getTargetUserId());
}
if (!authenticated) {
if (inLockoutMode) {
//认证错误
receiver.onError(getHalDeviceId(),
FingerprintManager.FINGERPRINT_ERROR_LOCKOUT);
}
}
......
}
/**
* Start authentication
*/
@Override
public int start() {
IFingerprintDaemon daemon = getFingerprintDaemon();
......
final int result = daemon.authenticate(mOpId, getGroupId());
......
return 0; // success
}
start方法会调用fingerprintd，调用底层的指纹库，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。这就是指纹的识别流程。
