Android8.1 SystemUI Keyguard之滑动解锁流程

咱们理解Keyguard的解锁流程主要从锁屏的界面Layout结构、touchEvent事件分发、解锁动做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结构能够简单归纳为如下结构：
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并无写在super_status_bar的layout文件里面，那么他是在何时添加的呢？

KeyguarBouncer什么时候建立

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);
    }

那么这里的container是什么？

protected ViewGroup getBouncerContainer() {
        return mStatusBarWindow;
    }

是何时把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);
        }
    }

不一样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

咱们这里分析上滑解锁过程当中的touchEvent事件分发
让咱们来先回顾一个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做用的，只有一个事件序列，才有意义。一个事件序列正常状况下，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事件做为序列的开始，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事件的传递过程当中，须要根据View事件处理方法（onTouchEvent）的返回值来肯定事件序列的接受者。若是一个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，看是否须要拦截touch事件
再一级级往子View传递，都没有被拦截，以后执行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必定的阈值会调用onTrackingStarted从而设置mTracking的值为true，onTouchEvent返回true，接收此touch move事件，以后的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，若是手指从down到up之间移动的距离达到必定阈值会调用onTrackingStopped

在上滑过程当中，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();
            }
        }
    };

解锁动做逻辑

整个解锁过程分为两个部分：1. 隐藏notification_panel 2. 展现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更改成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;
        }
        ...
    }

在没有安全锁的状况下，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

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