Is Activity an example of SubActivity?

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It routinely checks the Activity at the top of the current task

Whether it is an instance of the Activity that is about to be launched

If not, in some cases, it does nothing and ends the function call.

Here, the Activity at the top of the current task is MainActivity, which is not an instance of SubActivity, so proceed to:

[java] view plaincopy boolean newTask = false; / / Should this be considered a new task? If (r.resultTo = = null & &! addingToTask & & (launchFlags&Intent.FLAG_ACTIVITY_NEW_TASK)! = 0) {. } else if (sourceRecord! = null) {if (! addingToTask & & (launchFlags&Intent.FLAG_ACTIVITY_CLEAR_TOP)! = 0) {. } else if (! addingToTask & (launchFlags&Intent.FLAG_ACTIVITY_REORDER_TO_FRONT)! = 0) {. } / / An existing activity is starting this new activity, so we want / / to keep the new one in the same task as the one that is starting / / it. R.task = sourceRecord.task;. } else {. }

Here, first initialize the newTask variable to false, which means that you should not start the SubActivity in the new task. Since the previous one has set addingToTask to true, the middle else if statement will be executed here, that is, r.task will be set to sourceRecord.task, that is, SubActivity will be started in the task where MainActivity is located.

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