我们理解Keyguard的解锁流程主要从锁屏的界面Layout结构、touchEvent事件分发、解锁动作逻辑几个方面进行源码的分析
锁屏的界面Layout结构分析
StatusbarWindowView
整个锁屏界面的顶级View就是mStatusBarWindow
src/com/android/systemui/statusbar/phone/StatusBar.java
public void createAndAddWindows() {
addStatusBarWindow();
}
private void addStatusBarWindow() {
makeStatusBarView();
mStatusBarWindowManager = Dependency.get(StatusBarWindowManager.class);
mRemoteInputController = new RemoteInputController(mHeadsUpManager);
mStatusBarWindowManager.add(mStatusBarWindow, getStatusBarHeight());
// add by hai.qin for story lock
if (mLockScreenManager != null) {
mLockScreenManager.setStatusBarWindowManager(mStatusBarWindowManager);
}
//
}
src/com/android/systemui/statusbar/phone/StatusBarWindowManager.java
/**
* Adds the status bar view to the window manager.
*
* @param statusBarView The view to add.
* @param barHeight The height of the status bar in collapsed state.
*/
public void add(View statusBarView, int barHeight) {
// Now that the status bar window encompasses the sliding panel and its
// translucent backdrop, the entire thing is made TRANSLUCENT and is
// hardware-accelerated.
mLp = new WindowManager.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
barHeight,
WindowManager.LayoutParams.TYPE_STATUS_BAR,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_TOUCHABLE_WHEN_WAKING
| WindowManager.LayoutParams.FLAG_SPLIT_TOUCH
| WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH
| WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS,
PixelFormat.TRANSLUCENT);
mLp.token = new Binder();
mLp.gravity = Gravity.TOP;
mLp.softInputMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE;
mLp.setTitle("StatusBar");
mLp.packageName = mContext.getPackageName();
mStatusBarView = statusBarView;
mBarHeight = barHeight;
mWindowManager.addView(mStatusBarView, mLp);
mLpChanged = new WindowManager.LayoutParams();
mLpChanged.copyFrom(mLp);
}
mStatusBarWindow是在StatusBar的create流程中调用WindowManager.addView()添加到窗口上的， type为WindowManager.LayoutParams.TYPE_STATUS_BAR
Layout结构
锁屏界面的Layout结构可以简单概括为以下结构：
mStatusBarWindow--> R.layout.super_status_bar
notification_panel--> R.layout.status_bar_expanded
keyguardBouncer-->R.layout.keyguard_bouncer
mStatusBarWindow-->notification_panel-->notification_container_parent-->keyguard_header（锁屏状态栏）
| |
| -->keyguard_bottom_area （lock_icon和充电状态等）
| |
| -->keyguard_status_view （锁屏时钟日期）
| |
| -->keyguard_up_slide （箭头提示动画）
|
-->keyguardBouncer（安全锁界面）
上划后显示的安全锁界面是KeyguardBouncer，但keyguardbouncer并没有写在super_status_bar的layout文件里面，那么他是在什么时候添加的呢？
KeyguarBouncer何时创建
src/com/android/systemui/statusbar/phone/StatusBar.java
-->start()-->startKeyguard()
protected void startKeyguard() {
...
mStatusBarKeyguardViewManager = keyguardViewMediator.registerStatusBar(this,
getBouncerContainer(), mScrimController,
mFingerprintUnlockController);
...
}
src/com/android/systemui/keyguard/KeyguardViewMediator.java
-->registerStatusBar()
src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManager.java
-->registerStatusBar()
public void registerStatusBar(StatusBar statusBar,
ViewGroup container,
ScrimController scrimController,
FingerprintUnlockController fingerprintUnlockController,
DismissCallbackRegistry dismissCallbackRegistry) {
mStatusBar = statusBar;
mContainer = container;
mScrimController = scrimController;
mFingerprintUnlockController = fingerprintUnlockController;
mBouncer = SystemUIFactory.getInstance().createKeyguardBouncer(mContext,
mViewMediatorCallback, mLockPatternUtils, container, dismissCallbackRegistry);
}
那么这里的container是什么？
protected ViewGroup getBouncerContainer() {
return mStatusBarWindow;
}
是什么时候把keyguard_host_view加入到mStatuBarWindow的?
src/com/android/systemui/statusbar/phone/KeyguardBouncer.java
-->show()-->ensureView()-->inflateView()
protected void inflateView() {
removeView();
mHandler.removeCallbacks(mRemoveViewRunnable);
mRoot = (ViewGroup) LayoutInflater.from(mContext).inflate(R.layout.keyguard_bouncer, null);
mKeyguardView = mRoot.findViewById(R.id.keyguard_host_view);
mKeyguardView.setLockPatternUtils(mLockPatternUtils);
mKeyguardView.setViewMediatorCallback(mCallback);
mContainer.addView(mRoot, mContainer.getChildCount());
mRoot.setVisibility(View.INVISIBLE);
final WindowInsets rootInsets = mRoot.getRootWindowInsets();
if (rootInsets != null) {
mRoot.dispatchApplyWindowInsets(rootInsets);
}
}
不同类型的安全锁是怎么放入keyguard_host_view的？
src/com/android/keyguard/KeyguardSecurityContainer.java
private KeyguardSecurityView getSecurityView(SecurityMode securityMode) {
final int securityViewIdForMode = getSecurityViewIdForMode(securityMode);
KeyguardSecurityView view = null;
final int children = mSecurityViewFlipper.getChildCount();
for (int child = 0; child < children; child++) {
if (mSecurityViewFlipper.getChildAt(child).getId() == securityViewIdForMode) {
view = ((KeyguardSecurityView)mSecurityViewFlipper.getChildAt(child));
break;
}
}
int layoutId = getLayoutIdFor(securityMode);
if (view == null && layoutId != 0) {
final LayoutInflater inflater = LayoutInflater.from(mContext);
if (DEBUG) Log.v(TAG, "inflating id = " + layoutId);
View v = inflater.inflate(layoutId, mSecurityViewFlipper, false);
mSecurityViewFlipper.addView(v);
updateSecurityView(v);
view = (KeyguardSecurityView)v;
}
return view;
}
每次获取securityview的时候 先判断是否在viewflippter里存在该id
没有的话 inflate一个新的同时addview到viewflippter里面
在显示的时候调用showSecurityScreen（SecurityMode securityMode）
private void showSecurityScreen(SecurityMode securityMode) {
...
// Find and show this child.
final int childCount = mSecurityViewFlipper.getChildCount();
final int securityViewIdForMode = getSecurityViewIdForMode(securityMode);
for (int i = 0; i < childCount; i++) {
if (mSecurityViewFlipper.getChildAt(i).getId() == securityViewIdForMode) {
mSecurityViewFlipper.setDisplayedChild(i);
break;
}
}
...
}
会根据securitymode选择viewflipper中对应的child进行显示
touchEvent事件分发
我们这里分析上滑解锁过程中的touchEvent事件分发
让我们来先回顾一个android中的事件分发概念：事件序列
事件序列
在Android系统中，一个单独的事件基本上是没什么作用的，只有一个事件序列，才有意义。一个事件序列正常情况下，定义为 DOWN、MOVE（0或者多个）、UP/CANCEL。事件序列以DOWN事件开始，中间会有0或者多个MOVE事件，最后以UP事件或者CANCEL事件结束。
DOWN事件作为序列的开始，有一个很重要的职责，就是寻找事件序列的接受者，怎么理解呢？framework 在DOWN事件的传递过程中，需要根据View事件处理方法（onTouchEvent）的返回值来确定事件序列的接受者。如果一个View的onTouchEvent事件，在处理DOWN事件的时候返回true，说明它愿意接受并处理该事件序列。
上滑解锁
当用户移动手指时，产生touch down事件，
最外层view StatusBarWindowView会执行onInterceptTouchEvent，看是否需要拦截touch事件
再一级级往子View传递，都没有被拦截，之后执行OnTouchEvent从子View开始一级级往父View传递，到PanelView这里当手指移动的距离达到一定的阈值会调用onTrackingStarted从而设置mTracking的值为true，onTouchEvent返回true，接收此touch move事件，之后的touch事件直接传到此View。
在用户滑动过程会调用setExpandedHeightInternal,进而调用NotificationPanelView的onHeightUpdated进行锁屏上的时间和通知View根据手指的移动距离进行缩小、变透明处理。
当用户抬起手指时，产生touch up事件，PanelView接收到这个事件后会调用endMotionEvent，如果手指从down到up之间移动的距离达到一定阈值会调用onTrackingStopped
在上滑过程中，不断调用PanelView.java的setExpandedHeightInternal()->notifyBarPanelExpansionChanged()-->PanelBar.java的notifyBarPanelExpansionChanged()
src/com/android/systemui/statusbar/phone/PanelBar.java
public void panelExpansionChanged(float frac, boolean expanded) {
Log.d("WANG", "panelExpansionChanged frac=" + frac + " expaned=" + expanded );
boolean fullyClosed = true;
boolean fullyOpened = false;
if (SPEW) LOG("panelExpansionChanged: start state=%d", mState);
PanelView pv = mPanel;
pv.setVisibility(expanded ? VISIBLE : INVISIBLE);
// adjust any other panels that may be partially visible
if (expanded) {
if (mState == STATE_CLOSED) {
go(STATE_OPENING);
onPanelPeeked();
}
fullyClosed = false;
final float thisFrac = pv.getExpandedFraction();
if (SPEW) LOG("panelExpansionChanged: -> %s: f=%.1f", pv.getName(), thisFrac);
fullyOpened = thisFrac >= 1f;
}
if (fullyOpened && !mTracking) {
go(STATE_OPEN);
onPanelFullyOpened();
} else if (fullyClosed && !mTracking && mState != STATE_CLOSED) {
go(STATE_CLOSED);
onPanelCollapsed();
}
if (SPEW) LOG("panelExpansionChanged: end state=%d [%s%s ]", mState,
fullyOpened?" fullyOpened":"", fullyClosed?" fullyClosed":"");
}
达到阈值时，expanded == false fullyClosed == true
调用onPanelCollapsed()->调用子类PhoneStatubarView.java的onPanelCollapsed()
src/com/android/systemui/statusbar/phone/PhoneStatusBarView.java
@Override
public void onPanelCollapsed() {
super.onPanelCollapsed();
// Close the status bar in the next frame so we can show the end of the animation.
post(mHideExpandedRunnable);
mIsFullyOpenedPanel = false;
}
private Runnable mHideExpandedRunnable = new Runnable() {
@Override
public void run() {
if (mPanelFraction == 0.0f) {
mBar.makeExpandedInvisible();
}
}
};
解锁动作逻辑
整个解锁过程分为两个部分：1. 隐藏notification_panel 2. 展示keyguard_bouncer或直接解锁
src/com/android/systemui/statusbar/phone/StatusBar.java
void makeExpandedInvisible() {
if (SPEW) Log.d(TAG, "makeExpandedInvisible: mExpandedVisible=" + mExpandedVisible
+ " mExpandedVisible=" + mExpandedVisible);
if (!mExpandedVisible || mStatusBarWindow == null) {
return;
}
// Ensure the panel is fully collapsed (just in case; bug 6765842, 7260868)
mStatusBarView.collapsePanel(/*animate=*/ false, false /* delayed*/,
1.0f /* speedUpFactor */);
mNotificationPanel.closeQs();
mExpandedVisible = false;
visibilityChanged(false);
// Shrink the window to the size of the status bar only
mStatusBarWindowManager.setPanelVisible(false);
mStatusBarWindowManager.setForceStatusBarVisible(false);
// Close any guts that might be visible
closeAndSaveGuts(true /* removeLeavebehind */, true /* force */, true /* removeControls */,
-1 /* x */, -1 /* y */, true /* resetMenu */);
runPostCollapseRunnables();
setInteracting(StatusBarManager.WINDOW_STATUS_BAR, false);
showBouncerIfKeyguard();
recomputeDisableFlags(mNotificationPanel.hideStatusBarIconsWhenExpanded() /* animate */);
// Trimming will happen later if Keyguard is showing - doing it here might cause a jank in
// the bouncer appear animation.
if (!mStatusBarKeyguardViewManager.isShowing()) {
WindowManagerGlobal.getInstance().trimMemory(ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN);
}
}
mStatusBarWindowManager.setPanelVisible(false);
调用WindowManager更改为StatusBarWindow的高度， 只保留状态栏高度
mStatusBarWindowManager.setForceStatusBarVisible(false);
调用WindowManager使状态栏不可见
showBouncerIfKeyguard()->showBouncer()最终调用到StatusBarKeyguardViewManager的dismiss()->showBouncer()方法
src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManager.java
private void showBouncer() {
if (mShowing) {
mBouncer.show(false /* resetSecuritySelection */);
}
updateStates();
}
src/com/android/systemui/statusbar/phone/KeyguardBouncer.java
public void show(boolean resetSecuritySelection) {
...
// If allowed, try to dismiss the Keyguard. If no security auth (password/pin/pattern) is
// set, this will dismiss the whole Keyguard. Otherwise, show the bouncer.
if (allowDismissKeyguard && mKeyguardView.dismiss(activeUserId)) {
return;
}
...
}
在没有安全锁的情况下，会回调KeyguardHostView的finish方法
@Override
public void finish(boolean strongAuth, int targetUserId) {
// If there's a pending runnable because the user interacted with a widget
// and we're leaving keyguard, then run it.
boolean deferKeyguardDone = false;
if (mDismissAction != null) {
deferKeyguardDone = mDismissAction.onDismiss();
mDismissAction = null;
mCancelAction = null;
}
if (mViewMediatorCallback != null) {
if (deferKeyguardDone) {
mViewMediatorCallback.keyguardDonePending(strongAuth, targetUserId);
} else {
mViewMediatorCallback.keyguardDone(strongAuth, targetUserId);
}
}
}
mViewMediatorCallback定义在KeyguardViewMediator中
@Override
public void keyguardDone(boolean strongAuth, int targetUserId) {
if (targetUserId != ActivityManager.getCurrentUser()) {
return;
}
tryKeyguardDone();
}
一系列调用来到解锁的核心代码
mKeyguardGoingAwayRunnable.run();
private final Runnable mKeyguardGoingAwayRunnable = new Runnable() {
@Override
public void run() {
Trace.beginSection("KeyguardViewMediator.mKeyGuardGoingAwayRunnable");
if (DEBUG) Log.d(TAG, "keyguardGoingAway");
//Modified for MYOS begin
try {
mStatusBarKeyguardViewManager.keyguardGoingAway();
int flags = 0;
if (mStatusBarKeyguardViewManager.shouldDisableWindowAnimationsForUnlock()
|| mWakeAndUnlocking || mAniSpeedup) {
flags |= WindowManagerPolicy.KEYGUARD_GOING_AWAY_FLAG_NO_WINDOW_ANIMATIONS;
}
if (mStatusBarKeyguardViewManager.isGoingToNotificationShade()) {
flags |= WindowManagerPolicy.KEYGUARD_GOING_AWAY_FLAG_TO_SHADE;
}
if (mStatusBarKeyguardViewManager.isUnlockWithWallpaper()) {
flags |= WindowManagerPolicy.KEYGUARD_GOING_AWAY_FLAG_WITH_WALLPAPER;
}
mUpdateMonitor.setKeyguardGoingAway(true /* goingAway */);
// Don't actually hide the Keyguard at the moment, wait for window
// manager until it tells us it's safe to do so with
// startKeyguardExitAnimation.
ActivityManager.getService().keyguardGoingAway(flags);
} catch (RemoteException e) {
Log.e(TAG, "Error while calling WindowManager", e);
}
//Modified for MYOS end
Trace.endSection();
}
};
解锁过程的核心实质上是锁屏启动了一个runnable，
通知AMS和WMS显示锁屏下方的activity组件窗口以及调用该activity组件的生命周期
void keyguardGoingAway(int flags) {
if (!mKeyguardShowing) {
return;
}
Trace.traceBegin(TRACE_TAG_ACTIVITY_MANAGER, "keyguardGoingAway");
mWindowManager.deferSurfaceLayout();
try {
setKeyguardGoingAway(true);
mWindowManager.prepareAppTransition(TRANSIT_KEYGUARD_GOING_AWAY,
false /* alwaysKeepCurrent */, convertTransitFlags(flags),
false /* forceOverride */);
updateKeyguardSleepToken();
// Some stack visibility might change (e.g. docked stack)
mStackSupervisor.ensureActivitiesVisibleLocked(null, 0, !PRESERVE_WINDOWS);
mStackSupervisor.addStartingWindowsForVisibleActivities(true /* taskSwitch */);
mWindowManager.executeAppTransition();
} finally {
Trace.traceBegin(TRACE_TAG_ACTIVITY_MANAGER, "keyguardGoingAway: surfaceLayout");
mWindowManager.continueSurfaceLayout();
Trace.traceEnd(TRACE_TAG_ACTIVITY_MANAGER);
}
}
在系统准备解锁完成后，PhoneWindowManager回调KeyguardService的startKeyguardExitAnimation
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) {
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);
mDismissCallbackRegistry.notifyDismissSucceeded();
mStatusBarKeyguardViewManager.hide(startTime, fadeoutDuration);
resetKeyguardDonePendingLocked();
mHideAnimationRun = false;
adjustStatusBarLocked();
sendUserPresentBroadcast();
mUpdateMonitor.setKeyguardGoingAway(false /* goingAway */);
// ADD FOR FINGERPRINT SHOT BEGIN
mFingerPrintManager.notifyFpService(1, null);
// ADD FOR FINGERPRINT SHOT END
}
Trace.endSection();
}
播放解锁声音、设置StatusBar的flag、发出ACTION_USER_PRESENT广播、隐藏KeyguardView，解锁流程结束