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However, there are independent app stores, such as Cydia, Get Jar and F-Droid. Usually, they are downloaded from the platform to a target device, but sometimes they can be downloaded to laptops or desktop computers.
Mobile UI contexts signal cues from user activity, such as location and scheduling that can be shown from user interactions within a mobile application.
By Q2 2015, the Google Play and Apple stores alone generated billion.
An analyst report estimates that the app economy creates revenues of more than €10 billion per year within the European Union, while over 529,000 jobs have been created in 28 EU states due to the growth of the app market.
Mobile apps are first tested within the development environment using emulators and later subjected to field testing.
Emulators provide an inexpensive way to test applications on mobile phones to which developers may not have physical access.