Android 7.1.1 锁屏界面启动流程
Posted blfbuaa
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前几天遇到一个低概率复现锁屏界面不显示,仅仅显示状态栏的问题,跟了下锁屏界面启动显示的流程,在这分享下,也方便以后自己查看。前面简介了下Zygote启动流程, Zygote进程启动后会首先创建一个SystemServer进程,SystemServer进程在调用startOtherServices同一时候也会调用WindowManagerService的systemReady()方法
//frameworks/base/services/java/com/android/server/SystemServer.java private void startOtherServices() { ... wm = WindowManagerService.main(context, inputManager, mFactoryTestMode != FactoryTest.FACTORY_TEST_LOW_LEVEL, !mFirstBoot, mOnlyCore); ... try { wm.systemReady(); Slog.i("jason11", "SystemServer wm.systemReady"); } catch (Throwable e) { reportWtf("making Window Manager Service ready", e); } ... }
在WindowManagerService中直接调用了PhoneWindowManager里的systemReady()
//frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java //final WindowManagerPolicy mPolicy = new PhoneWindowManager(); public void systemReady() { mPolicy.systemReady(); }在PhoneWindowManager的systemReady()会依据一个Boolean值bindKeyguardNow来决定是否绑定keyguard service
//frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java /** {@inheritDoc} */ @Override public void systemReady() { mKeyguardDelegate = new KeyguardServiceDelegate(mContext); mKeyguardDelegate.onSystemReady(); readCameraLensCoverState(); updateUiMode(); boolean bindKeyguardNow; synchronized (mLock) { updateOrientationListenerLp(); mSystemReady = true; mHandler.post(new Runnable() { @Override public void run() { updateSettings(); } }); bindKeyguardNow = mDeferBindKeyguard; if (bindKeyguardNow) { // systemBooted ran but wasn‘t able to bind to the Keyguard, we‘ll do it now. mDeferBindKeyguard = false; } } if (bindKeyguardNow) { mKeyguardDelegate.bindService(mContext); mKeyguardDelegate.onBootCompleted(); } mSystemGestures.systemReady(); }
看到这里,可能会想到假设bindKeyguardNow为false就会不绑定,后面通过继续跟踪发如今PhoneWindowManager的systemBooted()里也会去绑定keyguard service。假设在systemBooted里绑定了就不在systemReady里再去绑定,自己測试的时候是在systemBooted绑定的
//frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java /** {@inheritDoc} */ @Override public void systemBooted() { boolean bindKeyguardNow = false; synchronized (mLock) { // Time to bind Keyguard; take care to only bind it once, either here if ready or // in systemReady if not. if (mKeyguardDelegate != null) { bindKeyguardNow = true; } else { // Because mKeyguardDelegate is null, we know that the synchronized block in // systemReady didn‘t run yet and setting this will actually have an effect. mDeferBindKeyguard = true; } } if (bindKeyguardNow) { mKeyguardDelegate.bindService(mContext); mKeyguardDelegate.onBootCompleted(); } synchronized (mLock) { mSystemBooted = true; } startedWakingUp(); screenTurningOn(null); screenTurnedOn(); }
以下就通过例如以下的时序图看看是怎样调用到systemBooted的,就不在一步步跟了
通过上面的分析知道。不管是在systemReady或systemBooted,都调用了KeyguardServiceDelegate对象的bindService方法,以下就以这种方法開始。看看锁屏界面是怎么显示出来的,先看看以下的时序图,再来分步解说
1、先来看看在KeyguardServiceDelegate怎样绑定KeyguardService的
//frameworks/base/services/core/java/com/android/server/policy/keyguard/KeyguardServiceDelegate.java public class KeyguardServiceDelegate { ... 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.setComponent(keyguardComponent); if (!context.bindServiceAsUser(intent, mKeyguardConnection, Context.BIND_AUTO_CREATE, UserHandle.OWNER)) { Log.v(TAG, "*** Keyguard: can‘t bind to " + keyguardComponent); mKeyguardState.showing = false; mKeyguardState.showingAndNotOccluded = false; mKeyguardState.secure = false; synchronized (mKeyguardState) { // TODO: Fix synchronisation model in this class. The other state in this class // is at least self-healing but a race condition here can lead to the scrim being // stuck on keyguard-less devices. mKeyguardState.deviceHasKeyguard = false; hideScrim(); } } else { if (DEBUG) Log.v(TAG, "*** Keyguard started"); } } ... }在bindService中调用了bindServiceAsUser绑定指定intent的service,config_keyguardComponent的定义例如以下
//frameworks/base/core/res/res/values/config.xml <!-- Keyguard component --> <string name="config_keyguardComponent" translatable="false">com.android.systemui/com.android.systemui.keyguard.KeyguardService</string>当绑定成功后会调用mKeyguardConnection里的onServiceConnected方法
//frameworks/base/services/core/java/com/android/server/policy/keyguard/KeyguardServiceDelegate.java public class KeyguardServiceDelegate { ... 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)); if (mKeyguardState.systemIsReady) { // If the system is ready, it means keyguard crashed and restarted. mKeyguardService.onSystemReady(); // This is used to hide the scrim once keyguard displays. if (mKeyguardState.interactiveState == INTERACTIVE_STATE_AWAKE) { mKeyguardService.onStartedWakingUp(); } if (mKeyguardState.screenState == SCREEN_STATE_ON || mKeyguardState.screenState == SCREEN_STATE_TURNING_ON) { mKeyguardService.onScreenTurningOn( new KeyguardShowDelegate(mDrawnListenerWhenConnect)); } if (mKeyguardState.screenState == SCREEN_STATE_ON) { mKeyguardService.onScreenTurnedOn(); } mDrawnListenerWhenConnect = null; } if (mKeyguardState.bootCompleted) { mKeyguardService.onBootCompleted(); } if (mKeyguardState.occluded) { mKeyguardService.setOccluded(mKeyguardState.occluded); } } @Override public void onServiceDisconnected(ComponentName name) { if (DEBUG) Log.v(TAG, "*** Keyguard disconnected (boo!)"); mKeyguardService = null; } }; ... }当mKeyguardState.systemIsReady为true是。就会通过KeyguardServiceWrapper的实例mKeyguardService调用onSystemReady方法。在KeyguardServiceWrapper的onSystemReady里调用了上面刚刚绑定成功的KeyguardService的onSystemReady方法
//frameworks/base/services/core/java/com/android/server/policy/keyguard/KeyguardServiceWrapper.java public class KeyguardServiceWrapper implements IKeyguardService { ... @Override // Binder interface public void onSystemReady() { try { mService.onSystemReady(); } catch (RemoteException e) { Slog.w(TAG , "Remote Exception", e); } } ... }
在KeyguardService的onSystemReady里调用了KeyguardViewMediator里的onSystemReady,在这里就不贴这个代码了,直接看看KeyguardViewMediator.onSystemReady这个里面干啥了
2、KeyguardViewMediator.onSystemReady
//frameworks/base/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java public class KeyguardViewMediator extends SystemUI { ... public void onSystemReady() { mSearchManager = (SearchManager) mContext.getSystemService(Context.SEARCH_SERVICE); 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(); } ... }在这种方法里主要调用了doKeyguardLocked和注冊了KeyguardUpdateMonitorCallback
3、通过调用doKeyguardLocked显示锁屏界面
//frameworks/base/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java public class KeyguardViewMediator extends SystemUI { ... private void doKeyguardLocked(Bundle options) { // if another app is disabling us, don‘t show if (!mExternallyEnabled) { if (DEBUG) Log.d(TAG, "doKeyguard: not showing because externally disabled"); // note: we *should* set mNeedToReshowWhenReenabled=true here, but that makes // for an occasional ugly flicker in this situation: // 1) receive a call with the screen on (no keyguard) or make a call // 2) screen times out // 3) user hits key to turn screen back on // instead, we reenable the keyguard when we know the screen is off and the call // ends (see the broadcast receiver below) // TODO: clean this up when we have better support at the window manager level // for apps that wish to be on top of the keyguard return; } // if the keyguard is already showing, don‘t bother if (mStatusBarKeyguardViewManager.isShowing()) { if (DEBUG) Log.d(TAG, "doKeyguard: not showing because it is already showing"); resetStateLocked(); return; } // if the setup wizard hasn‘t run yet, don‘t show final boolean requireSim = !SystemProperties.getBoolean("keyguard.no_require_sim", false); final boolean absent = SubscriptionManager.isValidSubscriptionId( mUpdateMonitor.getNextSubIdForState(IccCardConstants.State.ABSENT)); final boolean disabled = SubscriptionManager.isValidSubscriptionId( mUpdateMonitor.getNextSubIdForState(IccCardConstants.State.PERM_DISABLED)); final boolean lockedOrMissing = mUpdateMonitor.isSimPinSecure() || ((absent || disabled) && requireSim); if (!lockedOrMissing && shouldWaitForProvisioning()) { if (DEBUG) Log.d(TAG, "doKeyguard: not showing because device isn‘t provisioned" + " and the sim is not locked or missing"); return; } if (mLockPatternUtils.isLockScreenDisabled(KeyguardUpdateMonitor.getCurrentUser()) && !lockedOrMissing) { if (DEBUG) Log.d(TAG, "doKeyguard: not showing because lockscreen is off"); return; } 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(); mUpdateMonitor.reportSuccessfulStrongAuthUnlockAttempt(); return; } if (DEBUG) Log.d(TAG, "doKeyguard: showing the lock screen"); showLocked(options); } ... }这段代码主要是在是否要显示锁屏之前做了5个推断:1.假设启用第三方锁屏界面。不显示原生界面;2.锁屏界面已经显示了话,又一次更新下状态;3.假设第一次开机引导界面setup wizard 还没有执行,也先不显示;4.屏幕没有亮不显示;5.当前正在解密界面不显示。
假设这几个条件都不满足。则调用showLocked显示锁屏界面。在showLocked通过mHandler发送Message。在handleMessage里“case SHOW:”时调用handleShow
4、在handleShow里设置一些锁屏状态和显示锁屏界面
//frameworks/base/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java public class KeyguardViewMediator extends SystemUI { ... private void handleShow(Bundle options) { 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; updateActivityLockScreenState(); adjustStatusBarLocked(); userActivity(); mShowKeyguardWakeLock.release(); } mKeyguardDisplayManager.show(); } ... }
5、通过调用StatusBarKeyguardViewManager的show重置当前状态显示keyguard
//frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManager.java public class StatusBarKeyguardViewManager { ... public void show(Bundle options) { mShowing = true; mStatusBarWindowManager.setKeyguardShowing(true); mScrimController.abortKeyguardFadingOut(); reset(); } ... }在reset里调用本类的showBouncerOrKeyguard,在这种方法里通过KeyguardBouncer的实例mBouncer调用prepare(),在prepare里调用了KeyguardHostView的showPrimarySecurityScreen
6、KeyguardSecurityContainer.showPrimarySecurityScreen
在KeyguardHostView的showPrimarySecurityScreen里调用KeyguardSecurityContainer的showPrimarySecurityScreen方法。例如以下
//frameworks/base/packages/Keyguard/src/com/android/keyguard/KeyguardSecurityContainer.java public class KeyguardSecurityContainer extends FrameLayout implements KeyguardSecurityView { ... void showPrimarySecurityScreen(boolean turningOff) { SecurityMode securityMode = mSecurityModel.getSecurityMode(); if (DEBUG) Log.v(TAG, "showPrimarySecurityScreen(turningOff=" + turningOff + ")"); showSecurityScreen(securityMode); } ... }在这种方法里调用了showSecurityScreen,依据mSecurityModel.getSecurityMode()获取的SecurityMode来显示不同界面,SecurityMode定义例如以下
//frameworks/base/packages/Keyguard/src/com/android/keyguard/KeyguardSecurityModel.java public class KeyguardSecurityModel { public enum SecurityMode { Invalid, // NULL state None, // No security enabled Pattern, // Unlock by drawing a pattern. Password, // Unlock by entering an alphanumeric password PIN, // Strictly numeric password SimPin, // Unlock by entering a sim pin. SimPuk // Unlock by entering a sim puk } ... }
showSecurityScreen方法例如以下:
//frameworks/base/packages/Keyguard/src/com/android/keyguard/KeyguardSecurityContainer.java public class KeyguardSecurityContainer extends FrameLayout implements KeyguardSecurityView { ... private void showSecurityScreen(SecurityMode securityMode) { if (DEBUG) Log.d(TAG, "showSecurityScreen(" + securityMode + ")"); if (securityMode == mCurrentSecuritySelection) return; KeyguardSecurityView oldView = getSecurityView(mCurrentSecuritySelection); KeyguardSecurityView newView = getSecurityView(securityMode);//依据securityMode获取相应的view // Emulate Activity life cycle if (oldView != null) { oldView.onPause(); oldView.setKeyguardCallback(mNullCallback); // ignore requests from old view } if (securityMode != SecurityMode.None) { newView.onResume(KeyguardSecurityView.VIEW_REVEALED); newView.setKeyguardCallback(mCallback); } // 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; } } mCurrentSecuritySelection = securityMode; mSecurityCallback.onSecurityModeChanged(securityMode, securityMode != SecurityMode.None && newView.needsInput()); } ... }
到这里锁屏就启动完毕了,这里简单总结一下:
1. 在KeyguardServiceDelegate里绑定KeyguardService,并调用onSystemReady方法。
2. KeyguardViewMediator里调用doKeyguardLocked来决定是否须要显示锁屏界面。假设显示则调用StatusBarKeyguardViewManager的show,最后调用到KeyguardHostView的showPrimarySecurityScreen()。
3. 在KeyguardSecurityContainer的showPrimarySecurityScreen利用mSecurityModel.getSecurityMode()获取当前的securityMode,传入showSecurityScreen来显示不同锁屏界面。
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