(a) Initial knowledge of Android

<span id="Label3">Section I: Introduction to Mobile operating system<p>The current mainstream smart operating systems are: Android, IOS, windows mobile;</p><p>Android Open source, belongs to the Google company, the market share is large, the prospect is broad;</p><p>IOS belongs to apple, powerful, also occupy a larger market share;</p><p>Windows Mobile belongs to the mobile operating system developed by Microsoft corporation, which occupies a portion of market share;</p><p>Other operating systems are gradually eliminated by the market;</p>Section Ii: Introduction to the Android operating system<p>Development history, version, function, etc., please see Baidu encyclopedia;</p>Section Iii: Android Architecture<p>Baidu Encyclopedia</p><p>First Layer: application layer;</p><p>Second Layer: application Framework layer;</p><p>The third Layer: The system runs the library layer;</p><p>Layer Fourth: Linux Kernel layer;</p><p>Section Fourth: Android Environment Building</p><p>Here is how to build the development environment of android, here I do not explain in detail, online tutorials have a lot.</p><p>(a) Initial knowledge of Android</p></span>