ActivityManagerService启动过程中简单分析了AMS的启动过程，在其systemReady方法中调用了startHomeActivityLocked。调用getHomeIntent创建Intent.CATEGORY_HOME类型的intent，交给resolveActivityInfo方法,通过PackageManagerService找到满足CATEGORY_HOME的最合适的preferred Activity.
AMS创建CATEGORY_HOME intent
frameworks/base/services/core/java/com/android/server/ActivityManagerService.java
复制代码 public void systemReady(final Runnable goingCallback) {
// Start up initial activity.
mBooting = true;
startHomeActivityLocked(mCurrentUserId, "systemReady");
}
boolean startHomeActivityLocked(int userId, String reason) {
Intent intent = getHomeIntent();
ActivityInfo aInfo =
resolveActivityInfo(intent, STOCK_PM_FLAGS, userId);
...
mStackSupervisor.startHomeActivity(intent, aInfo, reason);
}
return true;
}
Intent getHomeIntent() {
Intent intent = new Intent(mTopAction, mTopData != null ? Uri.parse(mTopData) : null);
intent.setComponent(mTopComponent);
if (mFactoryTest != FactoryTest.FACTORY_TEST_LOW_LEVEL) {
intent.addCategory(Intent.CATEGORY_HOME);
}
return intent;
}
private ActivityInfo resolveActivityInfo(Intent intent, int flags, int userId) {
ResolveInfo info = AppGlobals.getPackageManager().resolveIntent(
intent, intent.resolveTypeIfNeeded(mContext.getContentResolver()),
flags, userId);
}
复制代码resolveIntent过滤出所有满足
PMS匹配主屏幕程序
\frameworks\base\services\core\java\com\android\server\pm\PackageManagerService.java
复制代码 public ResolveInfo resolveIntent(Intent intent, String resolvedType,
int flags, int userId) {
List query = queryIntentActivities(intent, resolvedType, flags, userId);
return chooseBestActivity(intent, resolvedType, flags, query, userId);
}
public List queryIntentActivities(Intent intent,
String resolvedType, int flags, int userId) {
}
private ResolveInfo chooseBestActivity(Intent intent, String resolvedType,
int flags, List query, int userId) {
if (query != null) {
final int N = query.size();
if (N == 1) {
return query.get(0);
} else if (N > 1) {
ResolveInfo ri = findPreferredActivity(intent, resolvedType,
flags, query, r0.priority, true, false, debug, userId);
}
}
ResolveInfo findPreferredActivity(Intent intent, String resolvedType, int flags,
List query, int priority, boolean always,
boolean removeMatches, boolean debug, int userId) {
...
// Try to find a matching persistent preferred activity.
ResolveInfo pri = findPersistentPreferredActivityLP(intent, resolvedType, flags, query,
debug, userId);
// If a persistent preferred activity matched, use it.
if (pri != null) {
return pri;
}
PreferredIntentResolver pir = mSettings.mPreferredActivities.get(userId);
}
复制代码 从PMS找到系统设置的主屏幕后，就调用ActivityStackSupervisor的startHomeActivity方法。接着调用startActivityLocked走startActivity启动流程
发起创建launcher进程
\frameworks\base\services\core\java\com\android\server\am\ActivityStackSupervisor.java
复制代码 void startHomeActivity(Intent intent, ActivityInfo aInfo, String reason) {
moveHomeStackTaskToTop(HOME_ACTIVITY_TYPE, reason);
startActivityLocked(null /* caller */, intent, null /* resolvedType */, aInfo,
null /* voiceSession */, null /* voiceInteractor */, null /* resultTo */,
null /* resultWho */, 0 /* requestCode */, 0 /* callingPid */, 0 /* callingUid */,
null /* callingPackage */, 0 /* realCallingPid */, 0 /* realCallingUid */,
0 /* startFlags */, null /* options */, false /* ignoreTargetSecurity */,
false /* componentSpecified */,
null /* outActivity */, null /* container */, null /* inTask */);
if (inResumeTopActivity) {
scheduleResumeTopActivities();
}
}
final int startActivityLocked(IApplicationThread caller,
Intent intent, String resolvedType, ActivityInfo aInfo,
IVoiceInteractionSession voiceSession, IVoiceInteractor voiceInteractor,
IBinder resultTo, String resultWho, int requestCode,
int callingPid, int callingUid, String callingPackage,
int realCallingPid, int realCallingUid, int startFlags, Bundle options,
boolean ignoreTargetSecurity, boolean componentSpecified, ActivityRecord[] outActivity,
ActivityContainer container, TaskRecord inTask) {
...
doPendingActivityLaunchesLocked(false);
err = startActivityUncheckedLocked(r, sourceRecord, voiceSession, voiceInteractor,
startFlags, true, options, inTask);
}
final int startActivityUncheckedLocked(final ActivityRecord r, ActivityRecord sourceRecord,
IVoiceInteractionSession voiceSession, IVoiceInteractor voiceInteractor, int startFlags,
boolean doResume, Bundle options, TaskRecord inTask) {
...
targetStack.mLastPausedActivity = null;
targetStack.startActivityLocked(r, newTask, doResume, keepCurTransition, options);
if (!launchTaskBehind) {
// Don't set focus on an activity that's going to the back.
mService.setFocusedActivityLocked(r, "startedActivity");
}
return ActivityManager.START_SUCCESS;
}
复制代码通过ActivityStack的startActivityLocked发起创建APP进程，
\frameworks\base\services\core\java\com\android\server\am\ActivityStack.java
复制代码final void startActivityLocked(ActivityRecord r, boolean newTask,
boolean doResume, boolean keepCurTransition, Bundle options) {
if (doResume) {
mStackSupervisor.resumeTopActivitiesLocked(this, r, options);
}
}
final boolean resumeTopActivityLocked(ActivityRecord prev) {
return resumeTopActivityLocked(prev, null);
}
final boolean resumeTopActivityLocked(ActivityRecord prev, Bundle options) {
result = resumeTopActivityInnerLocked(prev, options);
}
private boolean resumeTopActivityInnerLocked(ActivityRecord prev, Bundle options) {
return isOnHomeDisplay() && mStackSupervisor.resumeHomeStackTask(returnTaskType, prev, "prevFinished");
...
if (DEBUG_STATES) Slog.d(TAG_STATES, "resumeTopActivityLocked: Restarting " + next);
mStackSupervisor.startSpecificActivityLocked(next, true, true);
}
复制代码\frameworks\base\services\core\java\com\android\server\am\ActivityStackSupervisor.java
boolean resumeHomeStackTask(int homeStackTaskType, ActivityRecord prev, String reason) {
return mService.startHomeActivityLocked(mCurrentUser, reason);
}
void startSpecificActivityLocked(ActivityRecord r,
boolean andResume, boolean checkConfig) {
...
//通过AM通过发起创建launcher 应用进程
mService.startProcessLocked(r.processName, r.info.applicationInfo, true, 0,
"activity", r.intent.getComponent(), false, false, true);
}
复制代码进入launcher application
launcher进程创建好后，会进入ActivityManagerService的attachApplication，创建Application.
frameworks/base/services/core/java/com/android/server/ActivityManagerService.java
复制代码public final void attachApplication(IApplicationThread thread) {
attachApplicationLocked(thread, callingPid);
}
private final boolean attachApplicationLocked(IApplicationThread thread,
int pid) {
thread.bindApplication(processName, appInfo, providers, app.instrumentationClass,
profilerInfo, app.instrumentationArguments, app.instrumentationWatcher,
app.instrumentationUiAutomationConnection, testMode, enableOpenGlTrace,
isRestrictedBackupMode || !normalMode, app.persistent,
new Configuration(mConfiguration), app.compat,
getCommonServicesLocked(app.isolated),
mCoreSettingsObserver.getCoreSettingsLocked());
...
// See if the top visible activity is waiting to run in this process...
if (normalMode) {
try {
if (mStackSupervisor.attachApplicationLocked(app)) {
didSomething = true;
}
} catch (Exception e) {
Slog.wtf(TAG, "Exception thrown launching activities in " + app, e);
badApp = true;
}
}
}
复制代码进入根activity
接下来进入根Activity.
\frameworks\base\services\core\java\com\android\server\am\ActivityStackSupervisor.java
复制代码 boolean attachApplicationLocked(ProcessRecord app) throws RemoteException {
try {
if (realStartActivityLocked(hr, app, true, true)) {
didSomething = true;
}
}
}
final boolean realStartActivityLocked(ActivityRecord r,
ProcessRecord app, boolean andResume, boolean checkConfig)
throws RemoteException {
app.thread.scheduleLaunchActivity(new Intent(r.intent), r.appToken,
System.identityHashCode(r), r.info, new Configuration(mService.mConfiguration),
new Configuration(stack.mOverrideConfig), r.compat, r.launchedFromPackage,
task.voiceInteractor, app.repProcState, r.icicle, r.persistentState, results,
newIntents, !andResume, mService.isNextTransitionForward(), profilerInfo);
}
复制代码frameworks/base/core/java/android/app/ActivityManagerNative.java
复制代码class ApplicationThreadProxy implements IApplicationThread {
public final void scheduleLaunchActivity(Intent intent, IBinder token, int ident,
ActivityInfo info, Configuration curConfig, Configuration overrideConfig,
CompatibilityInfo compatInfo, String referrer, IVoiceInteractor voiceInteractor,
int procState, Bundle state, PersistableBundle persistentState,
List pendingResults, List pendingNewIntents,
boolean notResumed, boolean isForward, ProfilerInfo profilerInfo) throws RemoteException {
...
mRemote.transact(SCHEDULE_LAUNCH_ACTIVITY_TRANSACTION, data, null,
IBinder.FLAG_ONEWAY);
}
}
复制代码 ApplicationThreadNative.java
复制代码@Override
public boolean onTransact(int code, Parcel data, Parcel reply, int flags)
throws RemoteException {
case SCHEDULE_LAUNCH_ACTIVITY_TRANSACTION:
{
data.enforceInterface(IApplicationThread.descriptor);
Intent intent = Intent.CREATOR.createFromParcel(data);
IBinder b = data.readStrongBinder();
int ident = data.readInt();
ActivityInfo info = ActivityInfo.CREATOR.createFromParcel(data);
Configuration curConfig = Configuration.CREATOR.createFromParcel(data);
Configuration overrideConfig = null;
if (data.readInt() != 0) {
overrideConfig = Configuration.CREATOR.createFromParcel(data);
}
CompatibilityInfo compatInfo = CompatibilityInfo.CREATOR.createFromParcel(data);
String referrer = data.readString();
IVoiceInteractor voiceInteractor = IVoiceInteractor.Stub.asInterface(
data.readStrongBinder());
int procState = data.readInt();
Bundle state = data.readBundle();
PersistableBundle persistentState = data.readPersistableBundle();
List ri = data.createTypedArrayList(ResultInfo.CREATOR);
List pi = data.createTypedArrayList(ReferrerIntent.CREATOR);
boolean notResumed = data.readInt() != 0;
boolean isForward = data.readInt() != 0;
ProfilerInfo profilerInfo = data.readInt() != 0
? ProfilerInfo.CREATOR.createFromParcel(data) : null;
scheduleLaunchActivity(intent, b, ident, info, curConfig, overrideConfig, compatInfo,
referrer, voiceInteractor, procState, state, persistentState, ri, pi,
notResumed, isForward, profilerInfo);
return true;
}
}
复制代码 ActivityThread.java
复制代码 @Override
public final void scheduleLaunchActivity(Intent intent, IBinder token, int ident,
ActivityInfo info, Configuration curConfig, Configuration overrideConfig,
CompatibilityInfo compatInfo, String referrer, IVoiceInteractor voiceInteractor,
int procState, Bundle state, PersistableBundle persistentState,
List pendingResults, List pendingNewIntents,
boolean notResumed, boolean isForward, ProfilerInfo profilerInfo) {
updateProcessState(procState, false);
ActivityClientRecord r = new ActivityClientRecord();
r.token = token;
r.ident = ident;
r.intent = intent;
r.referrer = referrer;
r.voiceInteractor = voiceInteractor;
r.activityInfo = info;
r.compatInfo = compatInfo;
r.state = state;
r.persistentState = persistentState;
r.pendingResults = pendingResults;
r.pendingIntents = pendingNewIntents;
r.startsNotResumed = notResumed;
r.isForward = isForward;
r.profilerInfo = profilerInfo;
r.overrideConfig = overrideConfig;
updatePendingConfiguration(curConfig);
sendMessage(H.LAUNCH_ACTIVITY, r);
}
}
public void handleMessage(Message msg) {
if (DEBUG_MESSAGES) Slog.v(TAG, ">>> handling: " + codeToString(msg.what));
switch (msg.what) {
case LAUNCH_ACTIVITY: {
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityStart");
final ActivityClientRecord r = (ActivityClientRecord) msg.obj;
r.packageInfo = getPackageInfoNoCheck(
r.activityInfo.applicationInfo, r.compatInfo);
handleLaunchActivity(r, null);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
} break;
}
private void handleLaunchActivity(ActivityClientRecord r, Intent customIntent) {
Activity a = performLaunchActivity(r, customIntent);
}
private Activity performLaunchActivity(ActivityClientRecord r, Intent customIntent) {
activity.attach(appContext, this, getInstrumentation(), r.token,
r.ident, app, r.intent, r.activityInfo, title, r.parent,
r.embeddedID, r.lastNonConfigurationInstances, config,
r.referrer, r.voiceInteractor);
if (customIntent != null) {
activity.mIntent = customIntent;
}
r.lastNonConfigurationInstances = null;
activity.mStartedActivity = false;
int theme = r.activityInfo.getThemeResource();
if (theme != 0) {
activity.setTheme(theme);
}
activity.mCalled = false;
if (r.isPersistable()) {
mInstrumentation.callActivityOnCreate(activity, r.state, r.persistentState);
} else {
mInstrumentation.callActivityOnCreate(activity, r.state);
}
}
复制代码 通过callActivityOnCreate进入Launcher activity的onCreate,在onCteate中调.LauncherModel的startLoader post LoaderTask加载所有的App.
访问PMS加载所有安装程序
\packages\apps\Launcher2\src\com\android\launcher2\LauncherModel.java
复制代码public void startLoader(boolean isLaunching, int synchronousBindPage) {
mLoaderTask = new LoaderTask(mApp, isLaunching);
if (synchronousBindPage > -1 && mAllAppsLoaded && mWorkspaceLoaded) {
mLoaderTask.runBindSynchronousPage(synchronousBindPage);
} else {
sWorkerThread.setPriority(Thread.NORM_PRIORITY);
sWorker.post(mLoaderTask);
}
}
private class LoaderTask implements Runnable {
public void run() {
loadAndBindWorkspace();
loadAndBindAllApps();
}
}
private void loadAndBindAllApps() {
loadAllAppsByBatch();
}
private void loadAllAppsByBatch() {
final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
...
apps = mLauncherApps.getActivityList(null, user);
...
final Callbacks callbacks = tryGetCallbacks(oldCallbacks);
final ArrayList added = mBgAllAppsList.added;
final boolean firstProfile = p == 0;
mBgAllAppsList.added = new ArrayList();
mHandler.post(new Runnable() {
public void run() {
if (callbacks != null) {
if (firstProfile) {
callbacks.bindAllApplications(added);
} else {
callbacks.bindAppsAdded(added);
}
}
}
});
}
复制代码 显示ICON
回调Launcher的bindAllApplications方法，将所有应用加载到界面。
\packages\apps\Launcher2\src\com\android\launcher2\Launcher.java
复制代码 public void bindAllApplications(final ArrayList apps) {
Runnable setAllAppsRunnable = new Runnable() {
public void run() {
if (mAppsCustomizeContent != null) {
mAppsCustomizeContent.setApps(apps);
}
}
};
// Remove the progress bar entirely; we could also make it GONE
// but better to remove it since we know it's not going to be used
View progressBar = mAppsCustomizeTabHost.
findViewById(R.id.apps_customize_progress_bar);
if (progressBar != null) {
((ViewGroup)progressBar.getParent()).removeView(progressBar);
// We just post the call to setApps so the user sees the progress bar
// disappear-- otherwise, it just looks like the progress bar froze
// which doesn't look great
mAppsCustomizeTabHost.post(setAllAppsRunnable);
} else {
// If we did not initialize the spinner in onCreate, then we can directly set the
// list of applications without waiting for any progress bars views to be hidden.
setAllAppsRunnable.run();
}
}
复制代码 PackageManagerService开机扫描、安装APK过程分析