1樓：brucevanfdm
activity的startActivity()方法可使用預設配置的launch flag，而context的startActivity()須包含FLAG_ACTIVITY_NEW_TASK的launch flag，原因是該context可能沒有現存的任務棧供新建的activity使用，必須顯式指定生成乙個自己單獨的任務棧。
下面是API Reference：
activity.startActivity():
Launch a new activity. You will not receive any information about when the activity exits. This implementation overrides the base version, providing information about the activity performing the launch.
Because of this additional information, the FLAG_ACTIVITY_NEW_TASK launch flag is not required; if not specified, the new activity will be added to the task of the caller.
This method throws ActivityNotFoundException if there was no Activity found to run the given Intent.
context.startActivity()
Launch a new activity. You will not receive any information about when the activity exits.
Note that if this method is being called from outside of an Activity Context, then the Intent must include the FLAG_ACTIVITY_NEW_TASK launch flag. This is because, without being started from an existing Activity, there is no existing task in which to place the new activity and thus it needs to be placed in its own separate task.
This method throws ActivityNotFoundException if there was no Activity found to run the given Intent.
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