启动流程
本文只记录调用点方法名和一些我认为有用的信息。针对的是首次启动application的情况
1.**Actiivty:**
startActivity(Intent intent)
startActivity(Intent intent, @Nullable Bundle options)
startActivityForResult(intent, -1);
startActivityForResult(@RequiresPermission Intent intent, int requestCode,
@Nullable Bundle options)
//mParent 基本都是null
mInstrumentation.execStartActivity(
this, mMainThread.getApplicationThread(), mToken, this,
intent, requestCode, options)
2.**Instrumentation**：
execStartActivity(
Context who, IBinder contextThread, IBinder token, Activity target,
Intent intent, int requestCode, Bundle options)
ActivityTaskManager.getService().startActivity(whoThread,
who.getOpPackageName(), who.getAttributionTag(), intent,
intent.resolveTypeIfNeeded(who.getContentResolver()), token,
target != null ? target.mEmbeddedID : null, requestCode, 0, null, options);
3.**ActivityTaskManagerService：**
ActivityTaskManagerService extends IActivityTaskManager.Stub
startActivityAsUser（***）
4.**ActivityStarter：**
exec（）
executeRequest(Request request)
startActivityUnchecked
startActivityInner
mRootWindowContainer.resumeFocusedTasksTopActivities(
mTargetRootTask, mStartActivity, mOptions, mTransientLaunch);
5.Task
resumeTopActivityUncheckedLocked
resumeTopActivityInnerLocked
{
if (next.attachedToProcess()) {
next.app.updateProcessInfo(false /* updateServiceConnectionActivities */,
true /* activityChange */, false /* updateOomAdj */,
false /* addPendingTopUid */);
} else if (!next.isProcessRunning()) {
// Since the start-process is asynchronous, if we already know the process of next
// activity isn't running, we can start the process earlier to save the time to wait
// for the current activity to be paused.
final boolean isTop = this == taskDisplayArea.getFocusedRootTask();
mAtmService.startProcessAsync(next, false /* knownToBeDead */, isTop,
isTop ? "pre-top-activity" : "pre-activity");----启动进程
}
}
回到ActivityTaskManagerService
6.ActivityTaskManagerService
ActivityTaskManagerService#startProcessAsync
void startProcessAsync(ActivityRecord activity, boolean knownToBeDead, boolean isTop,
String hostingType) {
try {
if (Trace.isTagEnabled(TRACE_TAG_WINDOW_MANAGER)) {
Trace.traceBegin(TRACE_TAG_WINDOW_MANAGER, "dispatchingStartProcess:"
+ activity.processName);
}
// Post message to start process to avoid possible deadlock of calling into AMS with the
// ATMS lock held.
final Message m = PooledLambda.obtainMessage(ActivityManagerInternal::startProcess,
mAmInternal, activity.processName, activity.info.applicationInfo, knownToBeDead,
isTop, hostingType, activity.intent.getComponent());
mH.sendMessage(m);
} finally {
Trace.traceEnd(TRACE_TAG_WINDOW_MANAGER);
}
}--->
真实实现ActivityManagerInternal。AMS内部类
ActivityManagerService#
public final class LocalService extends ActivityManagerInternal
implements ActivityManagerLocal
继续往下：
ProcessList#startProcessLocked
newProcessRecordLocked-->会生成一个中间变量 ProcessRecord r = new ProcessRecord(mService, info, proc, uid);
startProcessLocked(app, hostingRecord, zygotePolicyFlags, abiOverride); --->app就是刚才生成的。
这个方法前半部分方法会计算GID和权限，包括读写权限，以及进程启动参数
后面 继续调用另外一个startProcessLocked
前期有个重要参数：final long startSeq = ++mProcStartSeqCounter;
启动核心来了：
final Process.ProcessStartResult startResult = startProcess(hostingRecord,
entryPoint, app,
uid, gids, runtimeFlags, zygotePolicyFlags, mountExternal, seInfo,
requiredAbi, instructionSet, invokeWith, startTime);-->启动app里面带有startSeq
startResult = appZygote.getProcess().start(entryPoint,
app.processName, uid, uid, gids, runtimeFlags, mountExternal,
app.info.targetSdkVersion, seInfo, requiredAbi, instructionSet,
app.info.dataDir, null, app.info.packageName,
/*zygotePolicyFlags=*/ ZYGOTE_POLICY_FLAG_EMPTY, isTopApp,
app.getDisabledCompatChanges(), pkgDataInfoMap, allowlistedAppDataInfoMap,
false, false,
new String[]{PROC_START_SEQ_IDENT + app.getStartSeq()});
PROC_START_SEQ_IDENT + app.getStartSeq()==“seq=startSeq”
entryPoint=andorid.app.ActivityThread
进程启动参数：
argsForZygote.add("--runtime-args");
argsForZygote.add("--setuid=" + uid);
argsForZygote.add("--setgid=" + gid);
argsForZygote.add("--runtime-flags=" + runtimeFlags);
if (mountExternal == Zygote.MOUNT_EXTERNAL_DEFAULT) {
argsForZygote.add("--mount-external-default");
} else if (mountExternal == Zygote.MOUNT_EXTERNAL_INSTALLER) {
argsForZygote.add("--mount-external-installer");
} else if (mountExternal == Zygote.MOUNT_EXTERNAL_PASS_THROUGH) {
argsForZygote.add("--mount-external-pass-through");
} else if (mountExternal == Zygote.MOUNT_EXTERNAL_ANDROID_WRITABLE) {
argsForZygote.add("--mount-external-android-writable");
}
argsForZygote.add("--target-sdk-version=" + targetSdkVersion);
// --setgroups is a comma-separated list
if (gids != null && gids.length > 0) {
final StringBuilder sb = new StringBuilder();
sb.append("--setgroups=");
final int sz = gids.length;
for (int i = 0; i < sz; i++) {
if (i != 0) {
sb.append(',');
}
sb.append(gids[i]);
}
argsForZygote.add(sb.toString());
}
if (niceName != null) {
argsForZygote.add("--nice-name=" + niceName);
}
if (seInfo != null) {
argsForZygote.add("--seinfo=" + seInfo);
}
if (instructionSet != null) {
argsForZygote.add("--instruction-set=" + instructionSet);
}
if (appDataDir != null) {
argsForZygote.add("--app-data-dir=" + appDataDir);
//data/user/0/pkg. 猜测应该是虚拟机工作路径
}
if (invokeWith != null) {
argsForZygote.add("--invoke-with");
argsForZygote.add(invokeWith);
}
if (startChildZygote) {
argsForZygote.add("--start-child-zygote");
}
if (packageName != null) {
argsForZygote.add("--package-name=" + packageName);
}
if (isTopApp) {
argsForZygote.add(Zygote.START_AS_TOP_APP_ARG);
}
if (pkgDataInfoMap != null && pkgDataInfoMap.size() > 0) {
StringBuilder sb = new StringBuilder();
sb.append(Zygote.PKG_DATA_INFO_MAP);
sb.append("=");
boolean started = false;
for (Map.Entry<String, Pair<String, Long>> entry : pkgDataInfoMap.entrySet()) {
if (started) {
sb.append(',');
}
started = true;
sb.append(entry.getKey());
sb.append(',');
sb.append(entry.getValue().first);
sb.append(',');
sb.append(entry.getValue().second);
}
argsForZygote.add(sb.toString());
}
if (allowlistedDataInfoList != null && allowlistedDataInfoList.size() > 0) {
StringBuilder sb = new StringBuilder();
sb.append(Zygote.ALLOWLISTED_DATA_INFO_MAP);
sb.append("=");
boolean started = false;
for (Map.Entry<String, Pair<String, Long>> entry : allowlistedDataInfoList.entrySet()) {
if (started) {
sb.append(',');
}
started = true;
sb.append(entry.getKey());
sb.append(',');
sb.append(entry.getValue().first);
sb.append(',');
sb.append(entry.getValue().second);
}
argsForZygote.add(sb.toString());
}
if (bindMountAppStorageDirs) {
argsForZygote.add(Zygote.BIND_MOUNT_APP_STORAGE_DIRS);
}
if (bindMountAppsData) {
argsForZygote.add(Zygote.BIND_MOUNT_APP_DATA_DIRS);
}
if (disabledCompatChanges != null && disabledCompatChanges.length > 0) {
StringBuilder sb = new StringBuilder();
sb.append("--disabled-compat-changes=");
int sz = disabledCompatChanges.length;
for (int i = 0; i < sz; i++) {
if (i != 0) {
sb.append(',');
}
sb.append(disabledCompatChanges[i]);
}
argsForZygote.add(sb.toString());
}
剩下的就是进程启动
到目前为止，进程启动了，但是还没有load akp。上面的dataDir没用相关信息的.
虽然有目录但是没用任何apk信息。
继续转动ActivityThread。
public static void main(String[] args) {
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "ActivityThreadMain");
// Install selective syscall interception
AndroidOs.install();
// CloseGuard defaults to true and can be quite spammy. We
// disable it here, but selectively enable it later (via
// StrictMode) on debug builds, but using DropBox, not logs.
CloseGuard.setEnabled(false);
Environment.initForCurrentUser();
// Make sure TrustedCertificateStore looks in the right place for CA certificates
final File configDir = Environment.getUserConfigDirectory(UserHandle.myUserId());
TrustedCertificateStore.setDefaultUserDirectory(configDir);
// Call per-process mainline module initialization.
initializeMainlineModules();
Process.setArgV0("<pre-initialized>");
Looper.prepareMainLooper();
// Find the value for {@link #PROC_START_SEQ_IDENT} if provided on the command line.
// It will be in the format "seq=114"
long startSeq = 0;
if (args != null) {
for (int i = args.length - 1; i >= 0; --i) {
if (args[i] != null && args[i].startsWith(PROC_START_SEQ_IDENT)) {
startSeq = Long.parseLong(
args[i].substring(PROC_START_SEQ_IDENT.length()));
}
}
}
ActivityThread thread = new ActivityThread();
thread.attach(false, startSeq);//这个就是上面传入的那个startSeq
if (sMainThreadHandler == null) {
sMainThreadHandler = thread.getHandler();
}
if (false) {
Looper.myLooper().setMessageLogging(new
LogPrinter(Log.DEBUG, "ActivityThread"));
}
// End of event ActivityThreadMain.
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
Looper.loop();
throw new RuntimeException("Main thread loop unexpectedly exited");
}
attach(boolean system, long startSeq)
final IActivityManager mgr = ActivityManager.getService();
try {
mgr.attachApplication(mAppThread, startSeq);
} catch (RemoteException ex) {
throw ex.rethrowFromSystemServer();
}
回到AMS
public final void attachApplication(IApplicationThread thread, long startSeq) {
if (thread == null) {
throw new SecurityException("Invalid application interface");
}
synchronized (this) {
int callingPid = Binder.getCallingPid();
final int callingUid = Binder.getCallingUid();
final long origId = Binder.clearCallingIdentity();
attachApplicationLocked(thread, callingPid, callingUid, startSeq);
Binder.restoreCallingIdentity(origId);
}
}
attachApplicationLocked
这段就是获取刚才启动的进程对应保存的ProcessRecord
if (app == null && startSeq > 0) {
final ProcessRecord pending = mProcessList.mPendingStarts.get(startSeq);
if (pending != null && pending.getStartUid() == callingUid
&& pending.getStartSeq() == startSeq
&& mProcessList.handleProcessStartedLocked(pending, pid,
pending.isUsingWrapper(), startSeq, true)) {
app = pending;
}
}
获取以后，把相关applicationInfo回传给
thread.bindApplication(processName, appInfo, providerList, null, profilerInfo,
null, null, null, testMode,
mBinderTransactionTrackingEnabled, enableTrackAllocation,
isRestrictedBackupMode || !normalMode, app.isPersistent(),
new Configuration(app.getWindowProcessController().getConfiguration()),
app.getCompat(), getCommonServicesLocked(app.isolated),
mCoreSettingsObserver.getCoreSettingsLocked(),
buildSerial, autofillOptions, contentCaptureOptions,
app.getDisabledCompatChanges(), serializedSystemFontMap);
回到ActivityThread,这里方法比较长。
private void handleBindApplication(AppBindData data) {
// Register the UI Thread as a sensitive thread to the runtime.
VMRuntime.registerSensitiveThread();
// In the case the stack depth property exists, pass it down to the runtime.
String property = SystemProperties.get("debug.allocTracker.stackDepth");
if (property.length() != 0) {
VMDebug.setAllocTrackerStackDepth(Integer.parseInt(property));
}
if (data.trackAllocation) {
DdmVmInternal.setRecentAllocationsTrackingEnabled(true);
}
// Note when this process has started.
Process.setStartTimes(SystemClock.elapsedRealtime(), SystemClock.uptimeMillis());
AppCompatCallbacks.install(data.disabledCompatChanges);
// Let libcore handle any compat changes after installing the list of compat changes.
AppSpecializationHooks.handleCompatChangesBeforeBindingApplication();
mBoundApplication = data;
mConfigurationController.setConfiguration(data.config);
mConfigurationController.setCompatConfiguration(data.config);
mConfiguration = mConfigurationController.getConfiguration();
mProfiler = new Profiler();
String agent = null;
if (data.initProfilerInfo != null) {
mProfiler.profileFile = data.initProfilerInfo.profileFile;
mProfiler.profileFd = data.initProfilerInfo.profileFd;
mProfiler.samplingInterval = data.initProfilerInfo.samplingInterval;
mProfiler.autoStopProfiler = data.initProfilerInfo.autoStopProfiler;
mProfiler.streamingOutput = data.initProfilerInfo.streamingOutput;
if (data.initProfilerInfo.attachAgentDuringBind) {
agent = data.initProfilerInfo.agent;
}
}
// send up app name; do this *before* waiting for debugger
Process.setArgV0(data.processName);
android.ddm.DdmHandleAppName.setAppName(data.processName,
data.appInfo.packageName,
UserHandle.myUserId());
VMRuntime.setProcessPackageName(data.appInfo.packageName);
// Pass data directory path to ART. This is used for caching information and
// should be set before any application code is loaded.
VMRuntime.setProcessDataDirectory(data.appInfo.dataDir);
if (mProfiler.profileFd != null) {
mProfiler.startProfiling();
}
// If the app is Honeycomb MR1 or earlier, switch its AsyncTask
// implementation to use the pool executor. Normally, we use the
// serialized executor as the default. This has to happen in the
// main thread so the main looper is set right.
if (data.appInfo.targetSdkVersion <= android.os.Build.VERSION_CODES.HONEYCOMB_MR1) {
AsyncTask.setDefaultExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
// Let the util.*Array classes maintain "undefined" for apps targeting Pie or earlier.
UtilConfig.setThrowExceptionForUpperArrayOutOfBounds(
data.appInfo.targetSdkVersion >= Build.VERSION_CODES.Q);
Message.updateCheckRecycle(data.appInfo.targetSdkVersion);
// Supply the targetSdkVersion to the UI rendering module, which may
// need it in cases where it does not have access to the appInfo.
android.graphics.Compatibility.setTargetSdkVersion(data.appInfo.targetSdkVersion);
/*
* Before spawning a new process, reset the time zone to be the system time zone.
* This needs to be done because the system time zone could have changed after the
* the spawning of this process. Without doing this this process would have the incorrect
* system time zone.
*/
TimeZone.setDefault(null);
/*
* Set the LocaleList. This may change once we create the App Context.
*/
LocaleList.setDefault(data.config.getLocales());
if (Typeface.ENABLE_LAZY_TYPEFACE_INITIALIZATION) {
try {
Typeface.setSystemFontMap(data.mSerializedSystemFontMap);
} catch (IOException | ErrnoException e) {
Slog.e(TAG, "Failed to parse serialized system font map");
Typeface.loadPreinstalledSystemFontMap();
}
}
synchronized (mResourcesManager) {
/*
* Update the system configuration since its preloaded and might not
* reflect configuration changes. The configuration object passed
* in AppBindData can be safely assumed to be up to date
*/
mResourcesManager.applyConfigurationToResources(data.config, data.compatInfo);
mCurDefaultDisplayDpi = data.config.densityDpi;
// This calls mResourcesManager so keep it within the synchronized block.
mConfigurationController.applyCompatConfiguration();
}
data.info = getPackageInfoNoCheck(data.appInfo, data.compatInfo);
if (agent != null) {
handleAttachAgent(agent, data.info);
}
/**
* Switch this process to density compatibility mode if needed.
*/
if ((data.appInfo.flags&ApplicationInfo.FLAG_SUPPORTS_SCREEN_DENSITIES)
== 0) {
mDensityCompatMode = true;
Bitmap.setDefaultDensity(DisplayMetrics.DENSITY_DEFAULT);
}
mConfigurationController.updateDefaultDensity(data.config.densityDpi);
// mCoreSettings is only updated from the main thread, while this function is only called
// from main thread as well, so no need to lock here.
final String use24HourSetting = mCoreSettings.getString(Settings.System.TIME_12_24);
Boolean is24Hr = null;
if (use24HourSetting != null) {
is24Hr = "24".equals(use24HourSetting) ? Boolean.TRUE : Boolean.FALSE;
}
// null : use locale default for 12/24 hour formatting,
// false : use 12 hour format,
// true : use 24 hour format.
DateFormat.set24HourTimePref(is24Hr);
updateDebugViewAttributeState();
StrictMode.initThreadDefaults(data.appInfo);
StrictMode.initVmDefaults(data.appInfo);
if (data.debugMode != ApplicationThreadConstants.DEBUG_OFF) {
// XXX should have option to change the port.
Debug.changeDebugPort(8100);
if (data.debugMode == ApplicationThreadConstants.DEBUG_WAIT) {
Slog.w(TAG, "Application " + data.info.getPackageName()
+ " is waiting for the debugger on port 8100...");
IActivityManager mgr = ActivityManager.getService();
try {
mgr.showWaitingForDebugger(mAppThread, true);
} catch (RemoteException ex) {
throw ex.rethrowFromSystemServer();
}
Debug.waitForDebugger();
try {
mgr.showWaitingForDebugger(mAppThread, false);
} catch (RemoteException ex) {
throw ex.rethrowFromSystemServer();
}
} else {
Slog.w(TAG, "Application " + data.info.getPackageName()
+ " can be debugged on port 8100...");
}
}
// Allow binder tracing, and application-generated systrace messages if we're profileable.
boolean isAppDebuggable = (data.appInfo.flags & ApplicationInfo.FLAG_DEBUGGABLE) != 0;
boolean isAppProfileable = isAppDebuggable || data.appInfo.isProfileable();
Trace.setAppTracingAllowed(isAppProfileable);
if ((isAppProfileable || Build.IS_DEBUGGABLE) && data.enableBinderTracking) {
Binder.enableTracing();
}
// Initialize heap profiling.
if (isAppProfileable || Build.IS_DEBUGGABLE) {
nInitZygoteChildHeapProfiling();
}
// Allow renderer debugging features if we're debuggable.
HardwareRenderer.setDebuggingEnabled(isAppDebuggable || Build.IS_DEBUGGABLE);
HardwareRenderer.setPackageName(data.appInfo.packageName);
// Pass the current context to HardwareRenderer
HardwareRenderer.setContextForInit(getSystemContext());
// Instrumentation info affects the class loader, so load it before
// setting up the app context.
final InstrumentationInfo ii;
if (data.instrumentationName != null) {
ii = prepareInstrumentation(data);
} else {
ii = null;
}
//这里创建pathloader
final ContextImpl appContext = ContextImpl.createAppContext(this, data.info);
mConfigurationController.updateLocaleListFromAppContext(appContext);
// Initialize the default http proxy in this process.
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "Setup proxies");
try {
// In pre-boot mode (doing initial launch to collect password), not all system is up.
// This includes the connectivity service, so trying to obtain ConnectivityManager at
// that point would return null. Check whether the ConnectivityService is available, and
// avoid crashing with a NullPointerException if it is not.
final IBinder b = ServiceManager.getService(Context.CONNECTIVITY_SERVICE);
if (b != null) {
final ConnectivityManager cm =
appContext.getSystemService(ConnectivityManager.class);
Proxy.setHttpProxyConfiguration(cm.getDefaultProxy());
}
} finally {
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
}
if (!Process.isIsolated()) {
final int oldMask = StrictMode.allowThreadDiskWritesMask();
try {
setupGraphicsSupport(appContext);
} finally {
StrictMode.setThreadPolicyMask(oldMask);
}
} else {
HardwareRenderer.setIsolatedProcess(true);
}
// Install the Network Security Config Provider. This must happen before the application
// code is loaded to prevent issues with instances of TLS objects being created before
// the provider is installed.
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "NetworkSecurityConfigProvider.install");
NetworkSecurityConfigProvider.install(appContext);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
// Continue loading instrumentation.
if (ii != null) {
initInstrumentation(ii, data, appContext);
} else {
mInstrumentation = new Instrumentation();
mInstrumentation.basicInit(this);
}
if ((data.appInfo.flags&ApplicationInfo.FLAG_LARGE_HEAP) != 0) {
dalvik.system.VMRuntime.getRuntime().clearGrowthLimit();
} else {
// Small heap, clamp to the current growth limit and let the heap release
// pages after the growth limit to the non growth limit capacity. b/18387825
dalvik.system.VMRuntime.getRuntime().clampGrowthLimit();
}
// Allow disk access during application and provider setup. This could
// block processing ordered broadcasts, but later processing would
// probably end up doing the same disk access.
Application app;
final StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskWrites();
final StrictMode.ThreadPolicy writesAllowedPolicy = StrictMode.getThreadPolicy();
try {
// If the app is being launched for full backup or restore, bring it up in
// a restricted environment with the base application class.
//初始化manifest定义的application，如果没有定义，则android.app.Application
//注意这里没有调用oncreate，只是初始化
app = data.info.makeApplication(data.restrictedBackupMode, null);
// Propagate autofill compat state
app.setAutofillOptions(data.autofillOptions);
// Propagate Content Capture options
app.setContentCaptureOptions(data.contentCaptureOptions);
sendMessage(H.SET_CONTENT_CAPTURE_OPTIONS_CALLBACK, data.appInfo.packageName);
mInitialApplication = app;
final boolean updateHttpProxy;
synchronized (this) {
updateHttpProxy = mUpdateHttpProxyOnBind;
// This synchronized block ensures that any subsequent call to updateHttpProxy()
// will see a non-null mInitialApplication.
}
if (updateHttpProxy) {
ActivityThread.updateHttpProxy(app);
}
// don't bring up providers in restricted mode; they may depend on the
// app's custom Application class
if (!data.restrictedBackupMode) {
if (!ArrayUtils.isEmpty(data.providers)) {
//安装定义的provider，在application#oncreate之前，这里会调用ams去做发布，这样就给到了ams provider的实例，后面调用provider就可以了
installContentProviders(app, data.providers);
}
}
// Do this after providers, since instrumentation tests generally start their
// test thread at this point, and we don't want that racing.
try {
mInstrumentation.onCreate(data.instrumentationArgs);
}
catch (Exception e) {
throw new RuntimeException(
"Exception thrown in onCreate() of "
+ data.instrumentationName + ": " + e.toString(), e);
}
try {
//这里就是调用application#oncreate
mInstrumentation.callApplicationOnCreate(app);
} catch (Exception e) {
if (!mInstrumentation.onException(app, e)) {
throw new RuntimeException(
"Unable to create application " + app.getClass().getName()
+ ": " + e.toString(), e);
}
}
} finally {
// If the app targets < O-MR1, or doesn't change the thread policy
// during startup, clobber the policy to maintain behavior of b/36951662
if (data.appInfo.targetSdkVersion < Build.VERSION_CODES.O_MR1
|| StrictMode.getThreadPolicy().equals(writesAllowedPolicy)) {
StrictMode.setThreadPolicy(savedPolicy);
}
}
// Preload fonts resources
FontsContract.setApplicationContextForResources(appContext);
if (!Process.isIsolated()) {
try {
final ApplicationInfo info =
getPackageManager().getApplicationInfo(
data.appInfo.packageName,
PackageManager.GET_META_DATA /*flags*/,
UserHandle.myUserId());
if (info.metaData != null) {
final int preloadedFontsResource = info.metaData.getInt(
ApplicationInfo.METADATA_PRELOADED_FONTS, 0);
if (preloadedFontsResource != 0) {
data.info.getResources().preloadFonts(preloadedFontsResource);
}
}
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
}
到这里，进程启动了，但是我们启动的activity去哪里了？哪里启动呢？
回到ams的attachApplicationLocked
didSomething = mAtmInternal.attachApplication(app.getWindowProcessController());
ActivityTaskManagerService#LoacalService
public boolean attachApplication(WindowProcessController wpc) throws RemoteException {
synchronized (mGlobalLockWithoutBoost) {
if (Trace.isTagEnabled(TRACE_TAG_WINDOW_MANAGER)) {
Trace.traceBegin(TRACE_TAG_WINDOW_MANAGER, "attachApplication:" + wpc.mName);
}
try {
return mRootWindowContainer.attachApplication(wpc);
} finally {
Trace.traceEnd(TRACE_TAG_WINDOW_MANAGER);
}
}
}
这里启动了activity，那么如果是service 呢？
继续回到ams的attachApplicationLocked
didSomething |= mServices.attachApplicationLocked(app, processName);
这里就启动了service
下面还有sendPendingBroadcastsLocked。这就是静态广播的启动。
补充下：provider调用ams发布以后，ams会检查是否有存在的调用，这里就不贴代码了。
四大组件启动的地方都找到了。
整理的有点乱，后续有时间把这个梳理的更清晰。
谢谢。
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