Android开机启动流程

薛文旺2024-09-10 12:34

Android开机启动流程

systemReady启动"added application"

java 复制代码 
@frameworks/base/services/java/com/android/server/SystemServer.java
main
    new SystemServer().run();
        startBootstrapServices
            mActivityManagerService = ActivityManagerService.Lifecycle.startService(mSystemServiceManager, atm);
            mDisplayManagerService = mSystemServiceManager.startService(DisplayManagerService.class);
            mActivityManagerService.setSystemProcess();
@frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
                ServiceManager.addService(Context.ACTIVITY_SERVICE
                ServiceManager.addService("meminfo", new MemBinder(this)
                ServiceManager.addService("gfxinfo", new GraphicsBinder(this))
                ApplicationInfo info = mContext.getPackageManager().getApplicationInfo( "android", STOCK_PM_FLAGS | MATCH_SYSTEM_ONLY);
                mSystemThread.installSystemApplicationInfo(info, getClass().getClassLoader());
                ProcessRecord app = mProcessList.newProcessRecordLocked(info, info.processName,   
        startOtherServices
@frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
            mActivityManagerService.systemReady(() -> {
                mLocalDeviceIdleController = LocalServices.getService(DeviceIdleInternal.class);
@frameworks/base/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
                mActivityTaskManager.onSystemReady();
@frameworks/base/services/core/java/com/android/server/wm/ActivityTaskSupervisor.java
                    mTaskSupervisor.onSystemReady();
@frameworks/base/services/core/java/com/android/server/wm/LaunchParamsPersister.java
                        mLaunchParamsPersister.onSystemReady();
                            PackageManagerInternal pmi = LocalServices.getService(PackageManagerInternal.class);
                            mPackageList = pmi.getPackageList(new PackageListObserver());
@frameworks/base/services/core/java/com/android/server/am/UserController.java
                mUserController.onSystemReady();
@frameworks/base/services/core/java/com/android/server/appop/AppOpsService.java
                mAppOpsService.systemReady();
                mProcessList.onSystemReady();
                    mAppExitInfoTracker.onSystemReady();
                ArrayList<ProcessRecord> procsToKill = null;  //杀应用名单
                for (int i=mPidsSelfLocked.size()-1; i>=0; i--) {
                    ProcessRecord proc = mPidsSelfLocked.valueAt(i);
                    procsToKill.add(proc);
@frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
                startPersistentApps(PackageManager.MATCH_DIRECT_BOOT_AWARE);
                    final List<ApplicationInfo> apps = AppGlobals.getPackageManager().getPersistentApplications(STOCK_PM_FLAGS | matchFlags).getList();
                    addAppLocked(app, null, false, null 
                        ProcessRecord app;
                        app = mProcessList.newProcessRecordLocked(info, customProcess, isolated, 0,
                        mProcessList.startProcessLocked(app, new HostingRecord("added application", customProcess != null ? customProcess : app.processName),
                            Start proc 1056:com.android.se/1068 for type:added application type end com.android.se
                            Start proc 1078:com.android.phone/1001 for type:added application type end com.android.phone
                            Start proc 1079:com.android.systemui/u0a50 for type:added application type end com.android.systemui

Home应用程序

Android系统在启动时安装应用程序的过程，这些应用程序安装好之后，还需要有一个Home应用程序来负责把它们在桌面上展示出来，在Android系统中，这个默认的Home应用程序就是Launcher了.

java 复制代码 
@frameworks/base/services/core/java/com/android/server/am/UserController.java
finishUserUnlocking
    mHandler.obtainMessage(USER_UNLOCK_MSG, userId, 0, uss).sendToTarget();
        case USER_UNLOCK_MSG: finishUserUnlocked
            finishUserUnlockedCompleted
                mHandler.obtainMessage(USER_UNLOCKED_MSG, userId, 0).sendToTarget();
                    case USER_UNLOCKED_MSG: mInjector.getSystemServiceManager().onUserUnlocked(msg.arg1);
                        mService.mTaskSupervisor.onUserUnlocked(user.getUserIdentifier());
@frameworks/base/services/core/java/com/android/server/wm/ActivityTaskSupervisor.java
                            scheduleStartHome("userUnlocked");
                                mHandler.obtainMessage(START_HOME_MSG, reason).sendToTarget();
                                    case START_HOME_MSG: { mRootWindowContainer.startHomeOnEmptyDisplays((String) msg.obj);    
                                    @frameworks/base/services/core/java/com/android/server/wm/RootWindowContainer.java
                                        startHomeOnEmptyDisplays
                                            forAllTaskDisplayAreas(taskDisplayArea -> {
                                                startHomeOnTaskDisplayArea(mCurrentUser, myReason, taskDisplayArea,        
@frameworks/base/services/core/java/com/android/server/wm/ActivityStartController.java
                                                    Service.getActivityStartController().startHomeActivity(homeIntent, aInfo, myReason, taskDisplayArea);
@frameworks/base/services/core/java/com/android/server/wm/ActivityStarter.java
                                                        mLastHomeActivityStartResult = obtainStarter(intent, "startHomeActivity: " + reason).setActivityOptions(options.toBundle()).execute();
                                                            res = executeRequest(mRequest);
                                                                ActivityRecord r = new ActivityRecord.Builder(mService)..setActivityInfo(aInfo)
                                                                mLastStartActivityResult = startActivityUnchecked(r, sourceRecord, voiceSession,
                                                                    result = startActivityInner(r, sourceRecord, voiceSession, voiceInteractor,startFlags, doResume, options, inTask, inTaskFragment, restrictedBgActivity,
                                                                        mTargetRootTask.startActivityLocked(mStartActivity,
@frameworks/base/services/core/java/com/android/server/wm/RootWindowContainer.java
                                                                        mRootWindowContainer.resumeFocusedTasksTopActivities(mTargetRootTask, mStartActivity, mOptions, mTransientLaunch);
                                                                            final Task focusedRoot = display.getFocusedRootTask();
@frameworks/base/services/core/java/com/android/server/wm/Task.java
                                                                            focusedRoot.resumeTopActivityUncheckedLocked(target, targetOptions);
                                                                                someActivityResumed = resumeTopActivityInnerLocked(prev, options, deferPause);
@frameworks/base/services/core/java/com/android/server/wm/TaskFragment.java
                                                                                    resumed[0] = topFragment.resumeTopActivity(prev, options, deferPause);
                                                                                        ActivityRecord next = topRunningActivity(true /* focusableOnly */);
                                                                                        pausing |= startPausing(mTaskSupervisor.mUserLeaving, false /* uiSleeping */, next, "resumeTopActivity");  //这里就是stop上一个activity的地方
                                                                                        if (next.attachedToProcess()) {   //要启动的activity所在的进程已经起来了，直接通过事务的形式去启动activity
                                                                                            final ClientTransaction transaction = ClientTransaction.obtain(next.app.getThread(), next.appToken);
                                                                                            mAtmService.getLifecycleManager().scheduleTransaction(transaction);
                                                                                        } else {   //如果进程没启动，调用ActivityTaskSupervisor的startSpecificActivity
@frameworks/base/services/core/java/com/android/server/wm/ActivityTaskSupervisor.java
                                                                                            mTaskSupervisor.startSpecificActivity(next, true, true);
@base/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
                                                                                                mService.startProcessAsync(r, knownToBeDead, isTop, isTop ? "top-activity" : "activity");
                                                                                                    final Message m = PooledLambda.obtainMessage(ActivityManagerInternal::startProcess, mAmInternal, activity.processName,
                                                                                                    mH.sendMessage(m);
                                                                                                        LocalService::startProcess  //class LocalService extends ActivityManagerInternal
                                                                                                            startProcessLocked(processName, info, knownToBeDead, 0 /* intentFlags */, new HostingRecord(hostingType, hostingName, isTop),
@frameworks/base/services/core/java/com/android/server/am/ProcessList.java
                                                                                                                return mProcessList.startProcessLocked(processName, info, knownToBeDead, intentFlags,
                                                                                                                    startProcessLocked(app, hostingRecord, zygotePolicyFlags, abiOverride);
                                                                                                                        startProcessLocked(app, hostingRecord, zygotePolicyFlags, false
                                                                                                                            startProcessLocked(hostingRecord, entryPoint, app, uid, gids, runtimeFlags, zygotePolicyFlags, mountExternal, seInfo, requiredAbi,
                                                                                                                                mService.mProcStartHandler.post(() -> handleProcessStart( app,
                                                                                                                                    handleProcessStartedLocked(app, startResult, startSeq);
                                                                                                                                        return handleProcessStartedLocked(pending, startResult.pid, startResult.usingWrapper,
                                                                                                                                            buf.append("Start proc ");  //Start proc 1486:com.dynabook.VDlauncher/1000 for top-activity {com.dynabook.VDlauncher/com.dynabook.VDlauncher.MainActivity}
                                                                                                                                            buf.append(pid);
                                                                                                                                            buf.append(':');
                                                                                                                                            buf.append(app.processName);
                                                                                                                                            buf.append('/');
                                                                                                                                            buf.append(app.getHostingRecord().getType());
                                                                                                                                            buf.append(app.getHostingRecord().getName());
                                                                                                                                            
                                                                                                                                            ..............
@src/main/java/com/xxx/launcher/MainActivity.java
                                                                                                                                                MainActivity::onCreate

@frameworks/base/services/java/com/android/server/SystemServer.java

main

new SystemServer().run();

startBootstrapServices

mActivityManagerService = ActivityManagerService.Lifecycle.startService(mSystemServiceManager, atm);

mDisplayManagerService = mSystemServiceManager.startService(DisplayManagerService.class);

mActivityManagerService.setSystemProcess();

@frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java

ServiceManager.addService(Context.ACTIVITY_SERVICE

ServiceManager.addService("meminfo", new MemBinder(this)

ServiceManager.addService("gfxinfo", new GraphicsBinder(this))

ApplicationInfo info = mContext.getPackageManager().getApplicationInfo( "android", STOCK_PM_FLAGS | MATCH_SYSTEM_ONLY);

mSystemThread.installSystemApplicationInfo(info, getClass().getClassLoader());

ProcessRecord app = mProcessList.newProcessRecordLocked(info, info.processName,

startOtherServices

@frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java

mActivityManagerService.systemReady(() -> {

mLocalDeviceIdleController = LocalServices.getService(DeviceIdleInternal.class);

@frameworks/base/services/core/java/com/android/server/wm/ActivityTaskManagerService.java

mActivityTaskManager.onSystemReady();

@frameworks/base/services/core/java/com/android/server/wm/ActivityTaskSupervisor.java

mTaskSupervisor.onSystemReady();

@frameworks/base/services/core/java/com/android/server/wm/LaunchParamsPersister.java

mLaunchParamsPersister.onSystemReady();

PackageManagerInternal pmi = LocalServices.getService(PackageManagerInternal.class);

mPackageList = pmi.getPackageList(new PackageListObserver());

@frameworks/base/services/core/java/com/android/server/am/UserController.java

mUserController.onSystemReady();

@frameworks/base/services/core/java/com/android/server/appop/AppOpsService.java

mAppOpsService.systemReady();

mProcessList.onSystemReady();

mAppExitInfoTracker.onSystemReady();

ArrayList<ProcessRecord> procsToKill = null; //杀应用名单

for (int i=mPidsSelfLocked.size()-1; i>=0; i--) {

ProcessRecord proc = mPidsSelfLocked.valueAt(i);

procsToKill.add(proc);

@frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java

startPersistentApps(PackageManager.MATCH_DIRECT_BOOT_AWARE);

final List<ApplicationInfo> apps = AppGlobals.getPackageManager().getPersistentApplications(STOCK_PM_FLAGS | matchFlags).getList();

addAppLocked(app, null, false, null

ProcessRecord app;

app = mProcessList.newProcessRecordLocked(info, customProcess, isolated, 0,

mProcessList.startProcessLocked(app, new HostingRecord("added application", customProcess != null ? customProcess : app.processName),

Start proc 1056:com.android.se/1068 for type:added application type end com.android.se

Start proc 1078:com.android.phone/1001 for type:added application type end com.android.phone

Start proc 1079:com.android.systemui/u0a50 for type:added application type end com.android.systemui

@frameworks/base/services/core/java/com/android/server/am/UserController.java

finishUserUnlocking

mHandler.obtainMessage(USER_UNLOCK_MSG, userId, 0, uss).sendToTarget();

case USER_UNLOCK_MSG: finishUserUnlocked

finishUserUnlockedCompleted

mHandler.obtainMessage(USER_UNLOCKED_MSG, userId, 0).sendToTarget();

case USER_UNLOCKED_MSG: mInjector.getSystemServiceManager().onUserUnlocked(msg.arg1);

mService.mTaskSupervisor.onUserUnlocked(user.getUserIdentifier());

@frameworks/base/services/core/java/com/android/server/wm/ActivityTaskSupervisor.java

scheduleStartHome("userUnlocked");

mHandler.obtainMessage(START_HOME_MSG, reason).sendToTarget();

case START_HOME_MSG: { mRootWindowContainer.startHomeOnEmptyDisplays((String) msg.obj);

@frameworks/base/services/core/java/com/android/server/wm/RootWindowContainer.java

startHomeOnEmptyDisplays

forAllTaskDisplayAreas(taskDisplayArea -> {

startHomeOnTaskDisplayArea(mCurrentUser, myReason, taskDisplayArea,

@frameworks/base/services/core/java/com/android/server/wm/ActivityStartController.java

Service.getActivityStartController().startHomeActivity(homeIntent, aInfo, myReason, taskDisplayArea);

@frameworks/base/services/core/java/com/android/server/wm/ActivityStarter.java

mLastHomeActivityStartResult = obtainStarter(intent, "startHomeActivity: " + reason).setActivityOptions(options.toBundle()).execute();

res = executeRequest(mRequest);

ActivityRecord r = new ActivityRecord.Builder(mService)..setActivityInfo(aInfo)

mLastStartActivityResult = startActivityUnchecked(r, sourceRecord, voiceSession,

result = startActivityInner(r, sourceRecord, voiceSession, voiceInteractor,startFlags, doResume, options, inTask, inTaskFragment, restrictedBgActivity,

mTargetRootTask.startActivityLocked(mStartActivity,

@frameworks/base/services/core/java/com/android/server/wm/RootWindowContainer.java

mRootWindowContainer.resumeFocusedTasksTopActivities(mTargetRootTask, mStartActivity, mOptions, mTransientLaunch);

final Task focusedRoot = display.getFocusedRootTask();

@frameworks/base/services/core/java/com/android/server/wm/Task.java

focusedRoot.resumeTopActivityUncheckedLocked(target, targetOptions);

someActivityResumed = resumeTopActivityInnerLocked(prev, options, deferPause);

@frameworks/base/services/core/java/com/android/server/wm/TaskFragment.java

resumed0 = topFragment.resumeTopActivity(prev, options, deferPause);

ActivityRecord next = topRunningActivity(true /* focusableOnly */);

pausing |= startPausing(mTaskSupervisor.mUserLeaving, false /* uiSleeping */, next, "resumeTopActivity"); //这里就是stop上一个activity的地方

if (next.attachedToProcess()) { //要启动的activity所在的进程已经起来了，直接通过事务的形式去启动activity

final ClientTransaction transaction = ClientTransaction.obtain(next.app.getThread(), next.appToken);

mAtmService.getLifecycleManager().scheduleTransaction(transaction);

} else { //如果进程没启动，调用ActivityTaskSupervisor的startSpecificActivity

@frameworks/base/services/core/java/com/android/server/wm/ActivityTaskSupervisor.java

mTaskSupervisor.startSpecificActivity(next, true, true);

@base/services/core/java/com/android/server/wm/ActivityTaskManagerService.java

mService.startProcessAsync(r, knownToBeDead, isTop, isTop ? "top-activity" : "activity");

final Message m = PooledLambda.obtainMessage(ActivityManagerInternal::startProcess, mAmInternal, activity.processName,

mH.sendMessage(m);

LocalService::startProcess //class LocalService extends ActivityManagerInternal

startProcessLocked(processName, info, knownToBeDead, 0 /* intentFlags */, new HostingRecord(hostingType, hostingName, isTop),

@frameworks/base/services/core/java/com/android/server/am/ProcessList.java

return mProcessList.startProcessLocked(processName, info, knownToBeDead, intentFlags,

startProcessLocked(app, hostingRecord, zygotePolicyFlags, abiOverride);

startProcessLocked(app, hostingRecord, zygotePolicyFlags, false

startProcessLocked(hostingRecord, entryPoint, app, uid, gids, runtimeFlags, zygotePolicyFlags, mountExternal, seInfo, requiredAbi,

mService.mProcStartHandler.post(() -> handleProcessStart( app,

handleProcessStartedLocked(app, startResult, startSeq);

return handleProcessStartedLocked(pending, startResult.pid, startResult.usingWrapper,

buf.append("Start proc "); //Start proc 1486:com.dynabook.VDlauncher/1000 for top-activity {com.dynabook.VDlauncher/com.dynabook.VDlauncher.MainActivity}

buf.append(pid);

buf.append(':');

buf.append(app.processName);

buf.append('/');

buf.append(app.getHostingRecord().getType());

buf.append(app.getHostingRecord().getName());

..............

@src/main/java/com/xxx/launcher/MainActivity.java

MainActivity::onCreate

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