Analysis of the Android SDK directory structure

Open the Downloaded SDK, you will find that there are many folders that hold different files, as shown in the following figure, then what is in these folders, the following is to explain the content.

1. Add-ons this has an additional library, such as Google Maps, of course, if you install the ophone SDK, there will be some class libraries in it.

2. Docs This is an Android SDK API reference document that all of the APIs can find here.

3. Market_licensing as an Android Market copyright protection component, the general release of paid applications to the electronic market can use it to counter piracy.

4. Platforms is the real file for each Platform SDK, which will be based on the API level of the SDK version, where the Android 2.2来 said, after entering a android-8 folder, Android-8 entered is the Android 2.2 The main file of the SDK, where Ant compiles the script, data holds some system resources, images is the emulator image file, skins is the skin of the Android emulator, templates is the default template for the project creation, and Android.jar is the Version of the main framework file, the tools directory contains important compiler tools, such as AAPT, Aidl, reverse Debugging tool dexdump and compile script dx.

5. Platform-tools maintains a number of common tools, such as ADB, and AAPT, Aidl, DX and other documents, Android123 hint, here and the platforms directory in the Tools folder some duplication, mainly from the Android 2.3 Start these tools are divided into universal.

6. Samples are the default example of the Android SDK project, which Apidemos highly recommended for beginners to run learning, for SQLite database operations can see the example of Notepad, for game development Snake, Lunarlander is a good example, the Android theme of the home is the Android M5 era theme design principles.

7. Tools, as the Tools folder under the SDK root, contains important tools such as DDMS for launching the Android debugging tools, such as Logcat, screenshots, and file Manager. While Draw9patch is a tool to map a scalable PNG image on the Android platform, Sqlite3 can operate the SQLite database on the PC, and Monkeyrunner is a good stress test application that simulates user random keystrokes, Mksdcard is the emulator SD image creation tool, emulator is the Android emulator main program, but starting from Android 1.5, you need to enter the appropriate parameters to start the simulator, TraceView as an important debugging tool on the Android platform.

8. Usb_driver, as its name suggests, keeps the Android platform on Google's official models of drivers such as Nexus One, Nexus S, and some old-model-driven support, such as HTC Dream, HTC Magic and Motorola's droid.