The difference between GetContext (), getapplicationcontext (), getbasecontext ()

<span id="Label3"></p> <ul> <li><li><p>1, View.getcontext (): Returns The context the View is currently running IN. Usually the currently active Activity.</p></li></li> <li><li>Context of the current activity</li></li> <li><li><p>2, Activity.getapplicationcontext (): Returns The context for the entire application (the process all the activities is run Ning inside Of). Use this instead of the current Activity context if you need a context tied to the lifecycle of the entire application, no t just the current Activity.</p></li></li> <li><li>Context of the application</li></li> <li><li><p>3, contextwrapper.getbasecontext (): If You need access to a context from within another context, you use a contextwrapper. The Context referred to from inside this contextwrapper is accessed via Getbasecontext ().</p></li></li> <li><li><code>getBaseContext()</code>Is the method of <code>ContextWrapper</code> . <code>ContextWrapper</code>and is, "<em>proxying implementation of the context that simply delegates all of its calls to another Context. Can is subclassed to modify behavior without changing the original Context.</em>"</li></li> </ul><p><p>　　</p></p><p><p>Unlike the life cycle of 1 and 2, the life cycle of the former depends on the activity in which it is based, and the life cycle of the latter depends on the entire Application. So when new Alertdialog.builder (getapplicationcontext ()) is wrong, Aletrdialog relies on a view, and the view corresponds to an activity, If the Getapplicationcontext () is passed in, its life cycle is the entire application, and when exiting the current activity, it will be reported unable to add window--the token null is the error for a application , the context of the current activity should be passed IN.</p></p><p><p></p></p><p><p>The difference between GetContext (), getapplicationcontext (), getbasecontext ()</p></p></span>