问题
I am using Handler for communicating between Current Activity and a subclass of Application. Subclass is having a thread which processes web service calls. Subclass may also have a ProgressDialog instance.
I want to show ProgressDialog when http call is starting and dismiss dialog when call is finished.
For this to happen, I need to access Activity from Handler. And then assign activity to Dialog using setOwnerActivity.
Is this possible? I tried and cant not get activity from Handler. The max Handler can give is Thread which sent message.
回答1:
Have you tried sending the Instance of the Activity using a Message with parameter msg.obj?
Btw, I think you should be using a AsyncTask instead of riddling it with complicated code.
回答2:
The application class is unaware of what activity is running.
The only thing that can be done is to let application class know about activity is by a setter method which is not recommended as it may lead to memory problems.
来源：https://stackoverflow.com/questions/4481928/android-getting-activity-instance-in-application-from-handler