Android8.1 SystemUI Keyguard之滑動解鎖流程
我們理解Keyguard的解鎖流程主要從鎖屏的介面Layout結構、touchEvent事件分發、解鎖動作邏輯幾個方面進行原始碼的分析
鎖屏的介面Layout結構分析
StatusbarWindowView
整個鎖屏介面的頂級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流程中呼叫WindowManager.addView()新增到視窗上的， type為WindowManager.LayoutParams.TYPE_STATUS_BAR
Layout結構
鎖屏介面的Layout結構可以簡單概括為以下結構：
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（鎖屏狀態列）
| |
| -->keyguard_bottom_area （lock_icon和充電狀態等）
| |
| -->keyguard_status_view （鎖屏時鐘日期）
| |
| -->keyguard_up_slide （箭頭提示動畫）
|
-->keyguardBouncer（安全鎖介面）
上劃後顯示的安全鎖介面是KeyguardBouncer，但keyguardbouncer並沒有寫在super_status_bar的layout檔案裡面，那麼他是在什麼時候新增的呢？
KeyguarBouncer何時建立
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);
}
那麼這裡的container是什麼？
protected ViewGroup getBouncerContainer() {
return mStatusBarWindow;
}
是什麼時候把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);
}
}
不同型別的安全鎖是怎麼放入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;
}
每次獲取securityview的時候 先判斷是否在viewflippter裡存在該id
沒有的話 inflate一個新的同時addview到viewflippter裡面
在顯示的時候呼叫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;
}
}
...
}
會根據securitymode選擇viewflipper中對應的child進行顯示
touchEvent事件分發
我們這裡分析上滑解鎖過程中的touchEvent事件分發
讓我們來先回顧一個android中的事件分發概念：事件序列
事件序列
在Android系統中，一個單獨的事件基本上是沒什麼作用的，只有一個事件序列，才有意義。一個事件序列正常情況下，定義為 DOWN、MOVE（0或者多個）、UP/CANCEL。事件序列以DOWN事件開始，中間會有0或者多個MOVE事件，最後以UP事件或者CANCEL事件結束。
DOWN事件作為序列的開始，有一個很重要的職責，就是尋找事件序列的接受者，怎麼理解呢？framework 在DOWN事件的傳遞過程中，需要根據View事件處理方法（onTouchEvent）的返回值來確定事件序列的接受者。如果一個View的onTouchEvent事件，在處理DOWN事件的時候返回true，說明它願意接受並處理該事件序列。
上滑解鎖
當用戶移動手指時，產生touch down事件，
最外層view StatusBarWindowView會執行onInterceptTouchEvent，看是否需要攔截touch事件
再一級級往子View傳遞，都沒有被攔截，之後執行OnTouchEvent從子View開始一級級往父View傳遞，到PanelView這裡當手指移動的距離達到一定的閾值會呼叫onTrackingStarted從而設定mTracking的值為true，onTouchEvent返回true，接收此touch move事件，之後的touch事件直接傳到此View。
在使用者滑動過程會呼叫setExpandedHeightInternal,進而呼叫NotificationPanelView的onHeightUpdated進行鎖屏上的時間和通知View根據手指的移動距離進行縮小、變透明處理。
當用戶擡起手指時，產生touch up事件，PanelView接收到這個事件後會呼叫endMotionEvent，如果手指從down到up之間移動的距離達到一定閾值會呼叫onTrackingStopped
在上滑過程中，不斷呼叫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":"");
}
達到閾值時，expanded == false fullyClosed == true
呼叫onPanelCollapsed()->呼叫子類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();
}
}
};
解鎖動作邏輯
整個解鎖過程分為兩個部分：1. 隱藏notification_panel 2. 展示keyguard_bouncer或直接解鎖
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);
呼叫WindowManager更改為StatusBarWindow的高度， 只保留狀態列高度
mStatusBarWindowManager.setForceStatusBarVisible(false);
呼叫WindowManager使狀態列不可見
showBouncerIfKeyguard()->showBouncer()最終呼叫到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;
}
...
}
在沒有安全鎖的情況下，會回撥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定義在KeyguardViewMediator中
@Override
public void keyguardDone(boolean strongAuth, int targetUserId) {
if (targetUserId != ActivityManager.getCurrentUser()) {
return;
}
tryKeyguardDone();
}
一系列呼叫來到解鎖的核心程式碼
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();
}
};
解鎖過程的核心實質上是鎖屏啟動了一個runnable，
通知AMS和WMS顯示鎖屏下方的activity元件視窗以及呼叫該activity元件的生命週期
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);
}
}
在系統準備解鎖完成後，PhoneWindowManager回撥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();
}
播放解鎖聲音、設定StatusBar的flag、發出ACTION_USER_PRESENT廣播、隱藏KeyguardView，解鎖流程結束