Android(安卓)8.1 系统锁屏显示流程整理

平台:

RK3399 + Android 8.1

源码跟踪:

系统启动时显示锁屏:

|-- frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

    KeyguardServiceDelegate mKeyguardDelegate;    /** {@inheritDoc} */    @Override    public void init(Context context, IWindowManager windowManager,            WindowManagerFuncs windowManagerFuncs) {...        mKeyguardDelegate = new KeyguardServiceDelegate(mContext,                new StateCallback() {                    @Override                    public void onTrustedChanged() {                        mWindowManagerFuncs.notifyKeyguardTrustedChanged();                    }                });    }/** {@inheritDoc} */    @Override    public void systemBooted() {        bindKeyguard();        ...    }    private void bindKeyguard() {        synchronized (mLock) {            if (mKeyguardBound) {                return;            }            mKeyguardBound = true;        }        mKeyguardDelegate.bindService(mContext);    }    /** {@inheritDoc} */    @Override    public void systemReady() {//系统服务启动完成.        // In normal flow, systemReady is called before other system services are ready.        // So it is better not to bind keyguard here.        mKeyguardDelegate.onSystemReady();}

所有的锁屏相关操作由mKeyguardDelegate 代理完成:
|-- frameworks/base/services/core/java/com/android/server/policy/keyguard/KeyguardServiceDelegate.java

   public void bindService(Context context) {       Intent intent = new Intent();       final Resources resources = context.getApplicationContext().getResources();       final ComponentName keyguardComponent = ComponentName.unflattenFromString(               resources.getString(com.android.internal.R.string.config_keyguardComponent));       intent.addFlags(Intent.FLAG_DEBUG_TRIAGED_MISSING);       intent.setComponent(keyguardComponent);       if (!context.bindServiceAsUser(intent, mKeyguardConnection,               Context.BIND_AUTO_CREATE, mHandler, UserHandle.SYSTEM)) {   ...   }   }    private final ServiceConnection mKeyguardConnection = new ServiceConnection() {       @Override       public void onServiceConnected(ComponentName name, IBinder service) {           if (DEBUG) Log.v(TAG, "*** Keyguard connected (yay!)");           mKeyguardService = new KeyguardServiceWrapper(mContext,                   IKeyguardService.Stub.asInterface(service), mCallback);   }   }   public void onSystemReady() {       if (mKeyguardService != null) {           mKeyguardService.onSystemReady();       } else {           mKeyguardState.systemIsReady = true;       }   }

BINDER对应的服务组件定义:
|-- frameworks/base/core/res/res/values/config.xml

    <string name="config_keyguardComponent" translatable="false">com.android.systemui/com.android.systemui.keyguard.KeyguardServicestring>

直指SystemUI:
|–frameworks/base/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardService.java

private final IKeyguardService.Stub mBinder = new IKeyguardService.Stub() {        @Override // Binder interface        public void onFinishedGoingToSleep(int reason, boolean cameraGestureTriggered) {            checkPermission();            mKeyguardViewMediator.onFinishedGoingToSleep(reason, cameraGestureTriggered);            mKeyguardLifecyclesDispatcher.dispatch(                    KeyguardLifecyclesDispatcher.FINISHED_GOING_TO_SLEEP);        }}        @Override // Binder interface        public void onSystemReady() {            Trace.beginSection("KeyguardService.mBinder#onSystemReady");            checkPermission();            mKeyguardViewMediator.onSystemReady();            Trace.endSection();        }

|-- frameworks/base/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java

/**     * Let us know that the system is ready after startup.     */    public void onSystemReady() {        synchronized (this) {            if (DEBUG) Log.d(TAG, "onSystemReady");            mSystemReady = true;            doKeyguardLocked(null);            mUpdateMonitor.registerCallback(mUpdateCallback);        }        // Most services aren't available until the system reaches the ready state, so we        // send it here when the device first boots.        maybeSendUserPresentBroadcast();    }

进休眠或关屏幕:

|-- frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

    @Override    public void finishedGoingToSleep(int why) {        ..        if (mKeyguardDelegate != null) {            mKeyguardDelegate.onFinishedGoingToSleep(why,                    mCameraGestureTriggeredDuringGoingToSleep);        }        mCameraGestureTriggeredDuringGoingToSleep = false;    }

|-- frameworks/base/services/core/java/com/android/server/policy/keyguard/KeyguardServiceDelegate.java

   public void onFinishedGoingToSleep(int why, boolean cameraGestureTriggered) {       if (mKeyguardService != null) {           mKeyguardService.onFinishedGoingToSleep(why, cameraGestureTriggered);       }       mKeyguardState.interactiveState = INTERACTIVE_STATE_SLEEP;   }

中间跳转代码与上面相似, 此处省略

|–frameworks/base/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java

   public void onFinishedGoingToSleep(int why, boolean cameraGestureTriggered) {   ...           if (mPendingLock) {               doKeyguardLocked(null);   ...   }   /** 最终显示锁屏的关键函数    * Enable the keyguard if the settings are appropriate.    */   private void doKeyguardLocked(Bundle options) {   ...   //在8.1, 采用PIN等密码锁时, 设备中的存储(data)会被加密, 在关机重启后, 进入一个一级启动状态   //这时候, DATA中的数据是原始的, 只有核心应用在这个阶段才是可用的, 同样, 一些系统设置项, 属性系统项, DATA中的文件,   //如: 在正常开机时, 保存一个文件到/data/file.txt, 在这阶段, 是找不到file.txt这个文件的.   //这是一个解密界面(Settings中的CryptKeeper), 同样需要输入当前设备解锁密码, 用于解密data.   //当成功解密后(checkVoldPassword 返回true), 启动时是不需要显示锁屏的.                if (mLockPatternUtils.checkVoldPassword(KeyguardUpdateMonitor.getCurrentUser())) {               if (DEBUG) Log.d(TAG, "Not showing lock screen since just decrypted");               // Without this, settings is not enabled until the lock screen first appears               setShowingLocked(false);               hideLocked();               return;           }   ...       if (DEBUG) Log.d(TAG, "doKeyguard: showing the lock screen");       showLocked(options);   }          /**    * Send message to keyguard telling it to show itself    * @see #handleShow    */   private void showLocked(Bundle options) {       Trace.beginSection("KeyguardViewMediator#showLocked aqcuiring mShowKeyguardWakeLock");       if (DEBUG) Log.d(TAG, "showLocked");       // ensure we stay awake until we are finished displaying the keyguard       mShowKeyguardWakeLock.acquire();       Message msg = mHandler.obtainMessage(SHOW, options);       mHandler.sendMessage(msg);       Trace.endSection();   }   /**    * Handle message sent by {@link #showLocked}.    * @see #SHOW    */   private void handleShow(Bundle options) {       Trace.beginSection("KeyguardViewMediator#handleShow");       final int currentUser = KeyguardUpdateMonitor.getCurrentUser();       if (mLockPatternUtils.isSecure(currentUser)) {           mLockPatternUtils.getDevicePolicyManager().reportKeyguardSecured(currentUser);       }       synchronized (KeyguardViewMediator.this) {           if (!mSystemReady) {               if (DEBUG) Log.d(TAG, "ignoring handleShow because system is not ready.");               return;           } else {               if (DEBUG) Log.d(TAG, "handleShow");           }           setShowingLocked(true);           mStatusBarKeyguardViewManager.show(options);           mHiding = false;           mWakeAndUnlocking = false;           resetKeyguardDonePendingLocked();           mHideAnimationRun = false;           adjustStatusBarLocked();//更新最后一次操作时间, 以便系统计算进入休眠.           userActivity();           mShowKeyguardWakeLock.release();       }       mKeyguardDisplayManager.show();       Trace.endSection();   }

|-- frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManager.java

    protected KeyguardBouncer mBouncer;    public void registerStatusBar(StatusBar statusBar,            ViewGroup container,            ScrimController scrimController,            FingerprintUnlockController fingerprintUnlockController,            DismissCallbackRegistry dismissCallbackRegistry) {        ...        mBouncer = SystemUIFactory.getInstance().createKeyguardBouncer(mContext,                mViewMediatorCallback, mLockPatternUtils, container, dismissCallbackRegistry);    }

|-- frameworks/base/packages/SystemUI/src/com/android/systemui/SystemUIFactory.java

    public KeyguardBouncer createKeyguardBouncer(Context context, ViewMediatorCallback callback,            LockPatternUtils lockPatternUtils,            ViewGroup container, DismissCallbackRegistry dismissCallbackRegistry) {        return new KeyguardBouncer(context, callback, lockPatternUtils, container,                dismissCallbackRegistry);    }

|-- frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/KeyguardBouncer.java

   public void show(boolean resetSecuritySelection) {       final int keyguardUserId = KeyguardUpdateMonitor.getCurrentUser();       if (keyguardUserId == UserHandle.USER_SYSTEM && UserManager.isSplitSystemUser()) {           // In split system user mode, we never unlock system user.           return;       }       mFalsingManager.onBouncerShown();       ensureView();       if (resetSecuritySelection) {           // showPrimarySecurityScreen() updates the current security method. This is needed in           // case we are already showing and the current security method changed.           mKeyguardView.showPrimarySecurityScreen();       }       if (mRoot.getVisibility() == View.VISIBLE || mShowingSoon) {           return;       }       final int activeUserId = ActivityManager.getCurrentUser();       final boolean isSystemUser =               UserManager.isSplitSystemUser() && activeUserId == UserHandle.USER_SYSTEM;       final boolean allowDismissKeyguard = !isSystemUser && activeUserId == keyguardUserId;       // 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;       }       // This condition may indicate an error on Android, so log it.       if (!allowDismissKeyguard) {           Slog.w(TAG, "User can't dismiss keyguard: " + activeUserId + " != " + keyguardUserId);       }       mShowingSoon = true;       // Split up the work over multiple frames.       DejankUtils.postAfterTraversal(mShowRunnable);   }   private final Runnable mShowRunnable = new Runnable() {       @Override       public void run() {           mRoot.setVisibility(View.VISIBLE);           mKeyguardView.onResume();           showPromptReason(mBouncerPromptReason);           // We might still be collapsed and the view didn't have time to layout yet or still           // be small, let's wait on the predraw to do the animation in that case.           if (mKeyguardView.getHeight() != 0 && mKeyguardView.getHeight() != mStatusBarHeight) {               mKeyguardView.startAppearAnimation();           } else {               mKeyguardView.getViewTreeObserver().addOnPreDrawListener(                       new ViewTreeObserver.OnPreDrawListener() {                           @Override                           public boolean onPreDraw() {                               mKeyguardView.getViewTreeObserver().removeOnPreDrawListener(this);                               mKeyguardView.startAppearAnimation();                               return true;                           }                       });               mKeyguardView.requestLayout();           }           mShowingSoon = false;           mKeyguardView.sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);       }   };

平台:

源码跟踪:

系统启动时显示锁屏:

进休眠或关屏幕:

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