Android Learning (1)

1. android Development History.

2. Build an android development environment. 2.1 java sdk (andriod sdk)> eclipse> adt 2.2 create an android simulator. 2.3 set environment variables. (Android_sdk_home) 3. Create an android Application. 3.1 start the simulator. * 3.2 android sdk Library: (1) scr (2) gen (3) android 4.4 (jar file) (4 )... (jar file) (5) assets video file (6) bin binary file (6) libs introduce external jar file (7) res place a file (resource) that generates a specific id) 4. Technical Structure of android Application Development: 5 based on ComponentsApplication Development Method: 5.1 components are parts. 5.2 android's most important four components: (1) activity: Responsible for interacting with users. (If android is a website, an activity is a webpage .) (2) service: responsible for most data processing. (3) content provider: provides external data and allows applications in need to access the data. (4) broadcastReceiver: monitors system behavior. 6 android application components: