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看下源码中的注释：

An entry in the history stack, representing an activity.

翻译：历史栈中的一个条目，代表一个activity

/** * An entry in the history stack, representing an activity. */final class ActivityRecord extends ConfigurationContainer implements AppWindowContainerListener {  private TaskRecord task;        // the task this is in.

用sourceInsight搜索整个android sdk源码，发现ActivityRecord 的构造方法只在一个地方调用过

即ActivityStarter的startActivity方法

ActivityRecord r = new ActivityRecord(mService, callerApp, callingPid, callingUid,                callingPackage, intent, resolvedType, aInfo, mService.getGlobalConfiguration(),                resultRecord, resultWho, requestCode, componentSpecified, voiceSession != null,                mSupervisor, checkedOptions, sourceRecord);

构造中传了超级多的内容

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