The best IntentService pattern I use is handling online web services, which can take several seconds to respond. I launch IntentServices to get data from various web services, and the data is placed in an SQLite db. The IntentService broadcasts a message back to the UI activity when it's done and the UI picks up the data from SQLite. In this way, the UI can populate various Views with data as it comes in from various web services (and show a default message/image in the view while it waits). The whole process is fairly simple, very robust, and looks good to the user.
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