In August 2005, it was acquired and funded by Google. In June 2007, Google established open handset alliance with 84 hardware manufacturers, software developers and telecom operators to jointly develop and improve the Android system. Then Google released the source code of Android under the authorization of Apache open source license.
The first Android smartphone was released in June 2008. Android has gradually expanded to tablet computers and other fields, such as televisions, digital cameras, game consoles and smart watches. 20 1 1 In the first quarter, the global market share of Android surpassed Saipan system for the first time, ranking first in the world. ?
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The four components of Android development are: activity: used to express functions. Service: The service runs in the background and does not provide interface presentation. BroadcastReceiver: used to receive the broadcast. Content provider: supports storing and reading data in multiple applications, which is equivalent to a database.
An Android application consists of multiple activities. These activities can jump to each other. For example, after pressing a button, you may jump to other activities. Slightly different from web page jumping, jumping between activities may return a value.
Baidu Encyclopedia-Android