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    ▪ 雷同class的startactivity使用Intent.FLAG_ACTIVITY_MULTIPLE_TASK        相同class的startactivity使用Intent.FLAG_ACTIVITY_MULTIPLE_TASK void android.content.Context.startActivity(Intent intent)Launch a new activity. You will not receive any information about when the activity exits. Note that if this method is bei.........

    ▪ Context的差异       Context的区别 引用In a regular Android application, you usually have two kinds of Context, Activity and Application. Reading the article a little bit further tells about the difference between to the two and why you might want to consider using t.........

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In a regular Android application, you usually have two kinds of Context, Activity and Application.

Reading the article a little bit further tells about the difference between to the two and why you might want to consider using the application Context (Activity.getApplicaitonContext()) rather than using the Activity context ("this"). Basically the Application context is associated with the Applicaiton and will always be the same throughout the life cycle of you app, where as the Activity context is associated with the activity and could possible be destroyed many times as the activity is destroyed during screen orientation changes and such.

I couldn't find really anything about when to use getBaseContext() other than a for a one liner from Dianne Hackborn, one of the Google engineers working on the Android SDK:

Don't use getBaseContext(), just use the Context you have.

That was from a post on the android-developers newsgroup, you may want to consider asking your question there as well because a handful of the people working on Android actual monitor that newsgroup and answer questions.

So overall it seems preferable to use the global application context when possible.


I got bad window token errors when using application context to Progress Dialog. So i used activity context instead.