LDD-> Hal-> JNI-> app framworks server-> java apk effect (refer to Lao Luo's Android journey)

I. Method of accessing device registers => access through the proc file system, access through the traditional method of device files, and access through the devfs file system.

2. Add Hal layer and JNI method implementationCode, Add helloserver service, write APK TestProgram.

Note:

1. After the appfaramworks server is added, modify the framworks file. After make snod is used, the system may stay on the android boot page. You can see from logcat that the system has been running repeatedly. In this case, try to use make droidcore to re-compile systemimage. The difference between this command and make Snod (system no dependence) Is that dependence dependencies are compiled.