void onClick(View v, String sourceContainer)->
// ItemClickHandler.java
// 10.0不再是ItemClickHandler.INSTANCE，只是换了一个写法返回依旧是一个OnClickListeneronClickAppShortcut(v, (WorkspaceItemInfo) tag, launcher, sourceContainer);
-
startAppShortcutOrInfoActivity(v, shortcut, launcher, sourceContainer);
launcher.startActivitySafely(v, intent, item);
要注意intent来自ItemInfo，如果支持FLAG_SUPPORTS_WEB_UI，会置空packageprivate static void startAppShortcutOrInfoActivity(View v, ItemInfo item, Launcher launcher, @Nullable String sourceContainer) { if (TestProtocol.sDebugTracing) { android.util.Log.d(TestProtocol.NO_START_TAG, "startAppShortcutOrInfoActivity"); } Intent intent; if (item instanceof PromiseAppInfo) { PromiseAppInfo promiseAppInfo = (PromiseAppInfo) item; intent = promiseAppInfo.getMarketIntent(launcher); } else { intent = item.getIntent(); } if (intent == null) { throw new IllegalArgumentException("Input must have a valid intent"); } if (item instanceof WorkspaceItemInfo) { WorkspaceItemInfo si = (WorkspaceItemInfo) item; if (si.hasStatusFlag(WorkspaceItemInfo.FLAG_SUPPORTS_WEB_UI) && Intent.ACTION_VIEW.equals(intent.getAction())) { // make a copy of the intent that has the package set to null // we do this because the platform sometimes disables instant // apps temporarily (triggered by the user) and fallbacks to the // web ui. This only works though if the package isn't set intent = new Intent(intent); intent.setPackage(null); } } if (v != null && launcher.getAppTransitionManager().supportsAdaptiveIconAnimation()) { // Preload the icon to reduce latency b/w swapping the floating view with the original. FloatingIconView.fetchIcon(launcher, v, item, true /* isOpening */); } launcher.startActivitySafely(v, intent, item, sourceContainer); } startActivitySafely(View v, Intent intent, ItemInfo item,@Nullable String sourceContainer)返回值boolean
// Launcher.java
中间有一个遇到意外等待重启的流程，这里我们走正常流程
super.startActivitySafely(v, intent, item, sourceContainer)startActivitySafely(View v, Intent intent, @Nullable ItemInfo item,
@Nullable String sourceContainer)返回值boolean
//BaseDraggingActivity.java
这里获取Bundle optsBundle = (v != null) ? getActivityLaunchOptionsAsBundle(v) : null;
view不为空的情况下intent.setSourceBounds(getViewBounds(v))
因为我们是Shortcuts所以走下面的方法startShortcutIntentSafely(intent, optsBundle, item, sourceContainer)
不是深度链接调用startActivity(intent, optsBundle);startActivity(Intent intent, @Nullable Bundle options)
//Activity.java
因为options != null所以调用下面方法-
startActivityForResult(intent, -1, options);
//Activity.java
因为mParent==null所以调用下面方法Instrumentation.ActivityResult ar = mInstrumentation.execStartActivity( this, mMainThread.getApplicationThread(), mToken, this, intent, requestCode, options);参数说明：requestCode=-1
mInstrumentation和mToken来自Activity.attach()的参数传入，
调用者是performLaunchActivity（）将ActivityThread的mInstrumentation和参数ActivityClientRecor的.token传给activity
ActivityThread在main()方法创建自己时调用了自己的attach(false, startSeq)
因为false所以没有走new Instrumentation()；
所以只有ActivityThread的handleBindApplication(AppBindData data)
因为不是ClassLoader.loadClass（类名）就是new Instrumentation()所以mInstrumentation肯定不为空
//TODO后面再分享如果自己修改默认是Instrumentation
mToken = ActivityClientRecord.token -
execStartActivity(Context who, IBinder contextThread, IBinder token, Activity target,
Intent intent, int requestCode, Bundle options) 返回值ActivityResult
//Instrumentation.java
参数说明：who是当前activity，contextThread是从当前activity的ActivityThread获取
最终调用了IApplicationThread whoThread = (IApplicationThread) contextThread; Uri referrer = target != null ? target.onProvideReferrer() : null; //因为onProvideReferrer()返回空所以不要给Intent添加Intent.EXTRA_REFERRER int result = ActivityTaskManager.getService() .startActivity(whoThread, who.getBasePackageName(), intent, intent.resolveTypeIfNeeded(who.getContentResolver()), token, target != null ? target.mEmbeddedID : null, requestCode, 0, null, options) -
static getService()
//ActivityTaskManager.java
IActivityTaskManagerSingleton.get()
是一个Singleton类静态实现，最终调用其中的oncreate方法
返回的是IActivityTaskManager的binder从ServiceManager的缓存中，找不到就去ServiceManagerNative最终去native层- SytemServer的main方法 new SystemServer.run()
- run()->startBootstrapServices()->
- 最终调用了ActivityTaskManagerService atm = mSystemServiceManager.startService(
ActivityTaskManagerService.Lifecycle.class).getService() - 通过反射构造了ActivityTaskManagerService.Lifecycle的实例，然后调用它的startService()方法
- startService()中执行了两个方法，重点是publishBinderService：
publishBinderService(Context.ACTIVITY_TASK_SERVICE, mService);
mService.start(); - publishBinderService这个是其父类SystemService的方法
- publishBinderService有多个重载方法，部分缺少参数默认值如下：allowIsolated=false, dumpPriority=SystemService。DUMP_FLAG_PRIORITY_DEFAULT
- 最终调用了ServiceManager.addService(name, service, allowIsolated, dumpPriority)完成注册
private static final Singleton<IActivityTaskManager> IActivityTaskManagerSingleton = new Singleton<IActivityTaskManager>() { @Override protected IActivityTaskManager create() { final IBinder b = ServiceManager.getService(Context.ACTIVITY_TASK_SERVICE); return IActivityTaskManager.Stub.asInterface(b); } };//ServiceManager.java public static IBinder getService(String name) { try { IBinder service = sCache.get(name); if (service != null) { return service; } else { return Binder.allowBlocking(rawGetService(name)); } } catch (RemoteException e) { Log.e(TAG, "error in getService", e); } return null; } startActivity()->startActivityAsUser()
//ActivityTaskManagerService.java
Linux uid/100000 4.1以上版本从100000开始，root是从0开始，每个用户加100000
public final int startActivity(IApplicationThread caller, String callingPackage,
Intent intent, String resolvedType, IBinder resultTo, String resultWho, int requestCode, int startFlags, ProfilerInfo profilerInfo, Bundle bOptions) {
return startActivityAsUser(caller, callingPackage, intent, resolvedType, resultTo,
resultWho, requestCode, startFlags, profilerInfo, bOptions,
UserHandle.getCallingUserId());
}
public int startActivityAsUser(IApplicationThread caller, String callingPackage,
Intent intent, String resolvedType, IBinder resultTo, String resultWho, int requestCode,int startFlags, ProfilerInfo profilerInfo, Bundle bOptions, int userId) {
return startActivityAsUser(caller, callingPackage, intent, resolvedType, resultTo,
resultWho, requestCode, startFlags, profilerInfo, bOptions, userId,
true /*validateIncomingUser*/);
}
int startActivityAsUser(IApplicationThread caller, String callingPackage,
Intent intent, String resolvedType, IBinder resultTo, String resultWho, int requestCode,int startFlags, ProfilerInfo profilerInfo, Bundle bOptions, int userId,
boolean validateIncomingUser) {
enforceNotIsolatedCaller("startActivityAsUser");
userId = getActivityStartController().checkTargetUser(userId, validateIncomingUser,
Binder.getCallingPid(), Binder.getCallingUid(), "startActivityAsUser");
// TODO: Switch to user app stacks here.
return getActivityStartController().obtainStarter(intent, "startActivityAsUser")
.setCaller(caller)
.setCallingPackage(callingPackage)
.setResolvedType(resolvedType)
.setResultTo(resultTo)
.setResultWho(resultWho)
.setRequestCode(requestCode)
.setStartFlags(startFlags)
.setProfilerInfo(profilerInfo)
.setActivityOptions(bOptions)
.setMayWait(userId)
.execute();
}
-
execute()
// ActivityStarter.java
因为setMayWait(userId)，所以mRequest.mayWait = true;
所以调用startActivityMayWait（）内部调用了startActivity(）startActivityMayWait(mRequest.caller, mRequest.callingUid, mRequest.callingPackage, mRequest.realCallingPid, mRequest.realCallingUid, mRequest.intent, mRequest.resolvedType, mRequest.voiceSession, mRequest.voiceInteractor, mRequest.resultTo, mRequest.resultWho, mRequest.requestCode, mRequest.startFlags, mRequest.profilerInfo, mRequest.waitResult, mRequest.globalConfig, mRequest.activityOptions, mRequest.ignoreTargetSecurity, mRequest.userId, mRequest.inTask, mRequest.reason, mRequest.allowPendingRemoteAnimationRegistryLookup, mRequest.originatingPendingIntent, mRequest.allowBackgroundActivityStart) startActivity(caller, intent, ephemeralIntent, resolvedType, aInfo, rInfo,
voiceSession, voiceInteractor, resultTo, resultWho, requestCode, callingPid,
callingUid, callingPackage, realCallingPid, realCallingUid, startFlags, options,
ignoreTargetSecurity, componentSpecified, outRecord, inTask, reason,
allowPendingRemoteAnimationRegistryLookup, originatingPendingIntent,
allowBackgroundActivityStart)startActivity(mRequest.caller, mRequest.intent, mRequest.ephemeralIntent,
mRequest.resolvedType, mRequest.activityInfo, mRequest.resolveInfo,
mRequest.voiceSession, mRequest.voiceInteractor, mRequest.resultTo,
mRequest.resultWho, mRequest.requestCode, mRequest.callingPid,
mRequest.callingUid, mRequest.callingPackage, mRequest.realCallingPid,
mRequest.realCallingUid, mRequest.startFlags, mRequest.activityOptions,
mRequest.ignoreTargetSecurity, mRequest.componentSpecified,
mRequest.outActivity, mRequest.inTask, mRequest.reason,
mRequest.allowPendingRemoteAnimationRegistryLookup);
//ActivityStarter.javamLastStartActivityResult = startActivity(caller, intent, ephemeralIntent, resolvedType,
aInfo, rInfo, voiceSession, voiceInteractor, resultTo, resultWho, requestCode,
callingPid, callingUid, callingPackage, realCallingPid, realCallingUid, startFlags,
options, ignoreTargetSecurity, componentSpecified, mLastStartActivityRecord,
inTask, allowPendingRemoteAnimationRegistryLookup);
//ActivityStarter.java
// 方法内部创建了ActivityRecordstartActivity(r, sourceRecord, voiceSession, voiceInteractor, startFlags,
true /* doResume */, checkedOptions, inTask, outActivity)
//ActivityStarter.javaresult = startActivityUnchecked(r, sourceRecord, voiceSession, voiceInteractor,
startFlags, doResume, options, inTask, outActivity);mSupervisor.resumeFocusedStackTopActivityLocked(mTargetStack,
mStartActivity, mOptions)
// mSupervisor是在AMS中创建最终传入ActivityStarter
// ActivityStackSupervisor.java
// mTargetStack 通过新建TaskRecord创建
// TO do有空细化targetStack.resumeTopActivityInnerLocked(target,
targetOptions)
// ActivityStack.javamStackSupervisor.startSpecificActivityLocked(target,
targetOptions)
// ActivityStackSupervisor.javaService.startProcessLocked(r.processName, r.info.applicationInfo, true, 0,
"activity", r.intent.getComponent(), false, false, true)
// ActivityManagerService.java
// 经过一阵startProcessLocked重载方法传递startProcess(hostingType, entryPoint, app,
uid, gids, runtimeFlags, mountExternal, seInfo, requiredAbi, instructionSet,
invokeWith, startTime)Process.start(entryPoint,
app.processName, uid, uid, gids, runtimeFlags, mountExternal,
app.info.targetSdkVersion, seInfo, requiredAbi, instructionSet,
app.info.dataDir, invokeWith,
new String[] {PROC_START_SEQ_IDENT + app.startSeq})zygoteProcess.start(processClass, niceName, uid, gid, gids,
runtimeFlags, mountExternal, targetSdkVersion, seInfo,
abi, instructionSet, appDataDir, invokeWith, zygoteArgs)startViaZygote(processClass, niceName, uid, gid, gids,
runtimeFlags, mountExternal, targetSdkVersion, seInfo,
abi, instructionSet, appDataDir, invokeWith, false /* startChildZygote /,
zygoteArgs)startViaZygote(processClass, niceName, uid, gid, gids,
runtimeFlags, mountExternal, targetSdkVersion, seInfo,
abi, instructionSet, appDataDir, invokeWith, false / startChildZygote /,
zygoteArgs)zygoteSendArgsAndGetResult(openZygoteSocketIfNeeded(abi), argsForZygote)
openZygoteSocketIfNeeded(abi)方法使用socket与ZygoteProcess进程通信，
zygoteSendArgsAndGetResult方法主要写入参数
其中processClass ="android.app.ActivityThread"，通过Zygote进程来Fork出一个新的进程，并执行 "android.app.ActivityThread"的main方法-
**[ZygoteInit.java] main()****
说明：Zygote先fork出SystemServer进程，接着进入循环等待，用来接收Socket发来的消息，用来fork出其他应用进程，比如Launcher
-
[ZygoteConnection.java] processOneCommand()
说明：通过forkAndSpecialize()来fork出Launcher的子进程，并执行handleChildProc，进入子进程的处理
[ZygoteConnection.java] handleChildProc()
说明：进行子进程的操作，最终获得需要执行的ActivityThread的main()[ZygoteConnection.java] zygoteInit()进行一些环境的初始化、启动Binder进程等操作：
-
把之前传来的"android.app.ActivityThread" 传递给findStaticMain()：
通过反射，拿到ActivityThread的main()方法：
把反射得来的ActivityThread main()入口返回给ZygoteInit的main，通过caller.run()进行调用： -
main(String[] args)
//ActivityThread.java
ActivityThread thread = new ActivityThread();
//ActivityThread实例化时其属性mAppThread也实例化
//final ApplicationThread mAppThread = new ApplicationThread();
thread.attach(false, startSeq);
-
attach(boolean system, long startSeq)
//ActivityThread.java-
ActivityManager.getService()
//ActivityManager.java-
ServiceManager.getService(Context.ACTIVITY_SERVICE)
BinderInternal.getContextObject()最终调用native层方法获取的是ActivityManagerService的binder
简单叙述AMS注册过程
SystemServer的static void main(String[] args)
---->run()
----> mSystemServiceManager = new SystemServiceManager(mSystemContext);
---->startBootstrapServices()
-------->1. mActivityManagerService = mSystemServiceManager.startService(
ActivityManagerService.Lifecycle.class).getService();
-------->SystemServiceManager的startService(Class<T> serviceClass)
-------->最终反射实例调用，因为ActivityManagerService.Lifecycle extends SystemService service.onStart()
-------->ActivityManagerService.Lifecycle.onStart()
-------->因为构造Lifecycle时内部mService = new ActivityManagerService(context, sAtm);
在构造方法内部创建了mStackSupervisor = createStackSupervisor();
protected ActivityStackSupervisor
-------->ActivityManagerService.Lifecycle.getService()返回内部mService
-------->2.mActivityManagerService.setSystemProcess();在startBootstrapServices()里面调用
ServiceManager.addService(Context.ACTIVITY_SERVICE, this, /* allowIsolated= */ true,
DUMP_FLAG_PRIORITY_CRITICAL | DUMP_FLAG_PRIORITY_NORMAL | DUMP_FLAG_PROTO) mgr.attachApplication(mAppThread, startSeq)
// ActivityManagerService.java
-
-
attachApplicationLocked(thread, callingPid, callingUid, startSeq)
// ActivityManagerService.java
//----->thread.bindApplication（）
这里的thread是最上面提到的ApplicationThread是ActivityThread的内部类，是bindersendMessage(H.BIND_APPLICATION, data);
//ActivityThread.java-
最终走到H类的handleBindApplication(data)
InstrumentationInfo ii = new ApplicationPackageManager(null, getPackageManager())
.getInstrumentationInfo(data.instrumentationName, 0)
IF----data.instrumentationName == null, ii = null-
IF---- ii!=null ----
final LoadedApk pi = getPackageInfo(instrApp, data.compatInfo,
appContext.getClassLoader(), false, true, false);
final ContextImpl instrContext = ContextImpl.createAppContext(this, pi)ELSE ----
mInstrumentation = new Instrumentation();END IF;
instrApp.initForUser(UserHandle.myUserId());
final LoadedApk pi = getPackageInfo(instrApp, data.compatInfo,
appContext.getClassLoader(), false, true, false);final ContextImpl appContext = ContextImpl.createAppContext(this, data.info);
-
Application app = data.info.makeApplication(data.restrictedBackupMode, null)
IF--------如果LoadedApk的mApplication中不为空就返回mApplication，
ELSE ---如果为空就先得到String appClass = mApplicationInfo.className;
再获取java.lang.ClassLoader cl = getClassLoader();
再创建ContextImpl appContext = ContextImpl.createAppContext(mActivityThread, this)
最终通过app = mActivityThread.mInstrumentation.newApplication(
cl, appClass, appContext)创建,
END IF----- -
mInstrumentation.callApplicationOnCreate(app);
app.onCreate()
最后我们返回ActivityManagerService.attachApplicationLocked()继续往下
mStackSupervisor.attachApplicationLocked(app)
// //ActivityStackSupervisor.java
// 来自ActivityManagerService.attachApplicationLocked(thread, callingPid, callingUid, startSeq)---->realStartActivityLocked(activity, app, top == activity /* andResume /, true / checkConfig */)
//ActivityStackSupervisor.javamService.getLifecycleManager().scheduleTransaction(clientTransaction)
// ActivityManagerService.java --- mService
// ClientLifecycleManager.java --- mService.getLifecycleManager()
// final ClientTransaction clientTransaction = ClientTransaction.obtain(app.thread, r.appToken);
// 在ActivityStackSupervisor.realStartActivityLocked()方法内部构造
// ClientLifecycleManager.scheduleTransaction(ClientTransaction transaction)mLifecycleManager.scheduleTransaction(ClientTransaction transaction)
// ClientLifecycleManager.javatransaction.schedule()
// ClientTransaction.java-
mClient.scheduleTransaction(this)
//ApplicationThread.java
ActivityThread.this.scheduleTransaction(transaction);
ClientTransactionHandler.scheduleTransaction(transaction)
// ActivityThread extends ClientTransactionHandler-
sendMessage(ActivityThread.H.EXECUTE_TRANSACTION, transaction);
// ClientTransactionHandler.java
handleMessage(Message msg)
// ActivityThread.H.mTransactionExecutor.execute(transaction);
//final ClientTransaction transaction = (ClientTransaction) msg.obj;
// TransactionExecutor.java 是ActivityThread的属性，定义时就初始化了
// private TransactionExecutor mTransactionExecutor = new TransactionExecutor(this)-
executeCallbacks(transaction);
// TransactionExecutor.java- final List<ClientTransactionItem> callbacks = transaction.getCallbacks();
-
item.execute(mTransactionHandler, token, mPendingActions);
//LaunchActivityItem.java
//在ActivityStackSupervisor的realStartActivityLocked()方法构造transaction //构造clientTransaction后将LaunchActivityItem添加入Callbacks
//最后后作为sendMessage参数传递过来
//在handleMessage方法中做了转换
final ClientTransaction clientTransaction = ClientTransaction.obtain(app.thread, r.appToken); clientTransaction.addCallback(LaunchActivityItem.obtain(new Intent(r.intent), System.identityHashCode(r), r.info, // TODO: Have this take the merged configuration instead of separate global // and override configs. mergedConfiguration.getGlobalConfiguration(), mergedConfiguration.getOverrideConfiguration(), r.compat, r.launchedFromPackage, task.voiceInteractor, app.repProcState, r.icicle, r.persistentState, results, newIntents, mService.isNextTransitionForward(), profilerInfo)); client.handleLaunchActivity(r, pendingActions, null /* customIntent */);
//ActivityStackSupervisor.realStartActivityLocked()内
client.handleLaunchActivity(r, pendingActions, null /* customIntent */);
因为ActivityThread extends ClientTransactionHandler且ActivityThread 覆写了此方法-
final Activity a = performLaunchActivity(r, customIntent)
// ActivityThread.JavaComponentName component = r.intent.getComponent()
新建ContextImpl appContext = createBaseContextForActivity(r)
-
通过 mInstrumentation.newActivity(cl, component.getClassName(), r.intent)创建 Activity
/frameworks/base/java/android/app/Instrumentation.java
getFactory(pkg).instantiateActivity(cl, className, intent)
- getFactory(pkg)
LoadedApk apk = mThread.peekPackageInfo(pkg, true); apk.getAppFactory()
LoadedApk构造时创建了AppComponentFactory
- AppComponentFactory.instantiateActivity(cl, className, intent)
最终通过classloader加载类，然后newInstance（）
-
Application app = r.packageInfo.makeApplication(false, mInstrumentation)
IF--------如果LoadedApk的mApplication中不为空就返回mApplication，
ELSE ---如果为空就先得到String appClass = mApplicationInfo.className;
再获取java.lang.ClassLoader cl = getClassLoader();
再创建ContextImpl appContext = ContextImpl.createAppContext(mActivityThread, this)
最终通过app = mActivityThread.mInstrumentation.newApplication(
cl, appClass, appContext)创建,
END IF----- 调用Acitivity的attach方法
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, window, r.configCallback);
Activity extends ContextThemeWrapper
ContextThemeWrapper extends ContextWrapper
ContextWrapper extends Context
Activity的attach()方法通过attachBaseContext一层一层往上调用传递-
mInstrumentation.callActivityOnCreate(activity....）传入activity最终调用acitivity的onCreate方法
r.isPersistable()是否持久模式重启
IF--true---ImInstrumentation.callActivityOnCreate(activity, r.state, r.persistentState);
ELSE------mInstrumentation.callActivityOnCreate(activity, r.state);正常我们走else
END IF----activity.performCreate(icicle, persistentState)
最终都会activity.performCreate(Bundle icicle, PersistableBundle persistentState)，只是最后一个参数有可能空
activity.onCreate(icicle)
我们在activity中setContentView(R.layout.activity_main);加载我们的布局
