Android Deep Explore the fourth chapter

Fourth chapter source code download and compile

Android source code contains something: an app embedded in android : photos, calculators, calendars, albums, dialer and other source code;Android SDK With various tools: such as:adb, emulator mksdcard apt etc source code,android ndk source code. Hal source code.

First, download, compile and test the source code:

1. Configure the android source code download environment:

(1) Create a directory to hold the download script file (repo) (The script file can be placed in any directory, using ~/bin);

#madir ~/bin

#path ~/bin: $path

(2) Download repo script (for download source code);

# Curl Https://dl-ssl.google.com/dl/googlesource/git-repo/repo > ~/bin/repo

#chmod a+x ~/bin/repo

(3) Create a directory to hold the android source code (can be placed in other directories);

# mkdir Android_reource

# CD Android_source

(4) initialization;# repo init-u https://android.googlesource.com/platform/manifest

(5) start to download android source code;# repo Sync

2.android Source code directory structure analysis;

Android part of the source code meaning:

ABI: application binary interface;

Device: equipment-related code;

Hardware: hardware layers and libraries.

SDK: Tools used in the development environment.

3. download part of the android source code,

To download the android Source code sub-project method:

Using the reop sync command # repo sync platform/bootable/recovery

Or use the git clone command:# git clone http://android.googlesourse.com/<project name>

4. To compile The Android source code: First Step: Initialize the compilation environment:

# source build/envsetup.sh or #. build/envsetup.sh the second step; select target: # Lunch Full-eng Step three: Build android Source code:# Make

5.out directory structure analysis; The Out directory is the default directory that holds the target files generated by the compiled Andriod source code. The image file can be tested using an android emulator or a real computer.

6. Publish your apk as a built-in program, and in order to test the file, you can embed an apk program you have built into the file.

7. Test The system.img file with the simulator .

Second, download and compile the Linux kernel source code:

Download linux kernel source code; git clone  http://android.googlesource.com.kernel/common.git git  branch - A  git checkout -b  android-3.0 remotes/origin/android-3.0 export android3.0 # git  clone  http://android,googlesourse.com/kernel/goldfish.git  

# git checkout-b android-goldfish-2.6.29 remotes/origin/android-goldfish-2.6.29// export goldfish

There are 4 stepsto install the android Kernel's build Environment :1. preparatory work

: Convert arm-linux-gcc-4.3.2.tgz files and arm-none-linux-gnueabi-arm-2008q3-72-for-linux.tar,bz2 files copied to the working directory

2. Unzip

3. Verify that the cross compiler is successfully installed # ls/user/local/arm-1

4. installing libncurses5# apt-get Install Libncurses5-dev

5. configure and compile the linux kernel.

Android Deep Explore the fourth chapter