Android emulator

使用 Android emulator 有两种方式，1) Android SDK , 2) 自己 repo sync Android 源代码，编译，运行 emulator.

1). SDK emulator

a). 将 一下路径加入到环境变量：

< android-sdk-linux >/tools

这是为了使用 android 和 emulator 这两个可执行文件，分别用于创建 emulator 和运行。

b). $ android list targets 列出所有可用的targets

android-sdk-linux$ android list targetsAvailable Android targets:----------id: 1 or "android-3"     Name: Android 1.5     Type: Platform     API level: 3     Revision: 4     Skins: HVGA (default), QVGA-L, QVGA-P, HVGA-P, HVGA-L     ABIs : armeabi----------id: 2 or "android-4"     Name: Android 1.6     Type: Platform     API level: 4     Revision: 3     Skins: WVGA800 (default), HVGA, WVGA854, QVGA     ABIs : armeabi----------id: 3 or "android-7"     Name: Android 2.1     Type: Platform     API level: 7     Revision: 3     Skins: WVGA800 (default), HVGA, WVGA854, WQVGA432, WQVGA400, QVGA     ABIs : armeabi----------id: 4 or "android-8"     Name: Android 2.2     Type: Platform     API level: 8     Revision: 3     Skins: WVGA800 (default), HVGA, WVGA854, WQVGA432, WQVGA400, QVGA     ABIs : armeabi----------id: 5 or "android-10"     Name: Android 2.3.3     Type: Platform     API level: 10     Revision: 2     Skins: WVGA800 (default), HVGA, WVGA854, WQVGA432, WQVGA400, QVGA     ABIs : armeabi, x86----------id: 6 or "android-11"     Name: Android 3.0     Type: Platform     API level: 11     Revision: 2     Skins: WXGA (default)     ABIs : armeabi----------id: 7 or "Google Inc.:Google APIs:11"     Name: Google APIs     Type: Add-On     Vendor: Google Inc.     Revision: 1     Description: Android + Google APIs     Based on Android 3.0 (API level 11)     Libraries:      * com.google.android.maps (maps.jar)          API for Google Maps     Skins: WXGA (default)     ABIs : armeabi----------id: 8 or "android-12"     Name: Android 3.1     Type: Platform     API level: 12     Revision: 3     Skins: WXGA (default)     ABIs : armeabi----------id: 9 or "Google Inc.:Google APIs:12"     Name: Google APIs     Type: Add-On     Vendor: Google Inc.     Revision: 1     Description: Android + Google APIs     Based on Android 3.1 (API level 12)     Libraries:      * com.android.future.usb.accessory (usb.jar)          API for USB Accessories      * com.google.android.maps (maps.jar)          API for Google Maps     Skins: WXGA (default)     ABIs : armeabi----------id: 10 or "Google Inc.:Google TV Addon:12"     Name: Google TV Addon     Type: Add-On     Vendor: Google Inc.     Revision: 2     Based on Android 3.1 (API level 12)     Skins: WXGA, 1080p-overscan, 1080p, 720p-overscan, 720p (default)     ABIs : x86----------id: 11 or "android-13"     Name: Android 3.2     Type: Platform     API level: 13     Revision: 1     Skins: WXGA (default)     ABIs : armeabi----------id: 12 or "Google Inc.:Google APIs:13"     Name: Google APIs     Type: Add-On     Vendor: Google Inc.     Revision: 1     Description: Android + Google APIs     Based on Android 3.2 (API level 13)     Libraries:      * com.android.future.usb.accessory (usb.jar)          API for USB Accessories      * com.google.android.maps (maps.jar)          API for Google Maps     Skins: WXGA (default)     ABIs : armeabi----------id: 13 or "Google Inc.:Google TV Addon:13"     Name: Google TV Addon     Type: Add-On     Vendor: Google Inc.     Revision: 1     Based on Android 3.2 (API level 13)     Skins: WXGA, 1080p-overscan, 1080p, 720p-overscan, 720p (default)     ABIs : x86----------id: 14 or "android-14"     Name: Android 4.0     Type: Platform     API level: 14     Revision: 3     Skins: WVGA800 (default), HVGA, WXGA720, WVGA854, WSVGA, WQVGA432, WQVGA400, WXGA800, QVGA     ABIs : armeabi-v7a----------id: 15 or "Google Inc.:Google APIs:14"     Name: Google APIs     Type: Add-On     Vendor: Google Inc.     Revision: 2     Description: Android + Google APIs     Based on Android 4.0 (API level 14)     Libraries:      * com.android.future.usb.accessory (usb.jar)          API for USB Accessories      * com.google.android.maps (maps.jar)          API for Google Maps     Skins: WQVGA400, WVGA854, WSVGA, WXGA720, HVGA, WQVGA432, QVGA, WVGA800 (default), WXGA800     ABIs : armeabi-v7a----------id: 16 or "android-15"     Name: Android 4.0.3     Type: Platform     API level: 15     Revision: 3     Skins: WVGA800 (default), HVGA, WXGA720, WVGA854, WSVGA, WQVGA432, WQVGA400, WXGA800, QVGA     ABIs : armeabi-v7a, mips, x86----------id: 17 or "Google Inc.:Google APIs:15"     Name: Google APIs     Type: Add-On     Vendor: Google Inc.     Revision: 2     Description: Android + Google APIs     Based on Android 4.0.3 (API level 15)     Libraries:      * com.google.android.media.effects (effects.jar)          Collection of video effects      * com.android.future.usb.accessory (usb.jar)          API for USB Accessories      * com.google.android.maps (maps.jar)          API for Google Maps     Skins: WQVGA400, WVGA854, WSVGA, WXGA720, HVGA, WQVGA432, QVGA, WVGA800 (default), WXGA800     ABIs : armeabi-v7a----------id: 18 or "android-16"     Name: Android 4.1.2     Type: Platform     API level: 16     Revision: 4     Skins: WVGA800 (default), HVGA, WXGA720, WVGA854, WSVGA, WXGA800-7in, WQVGA432, WQVGA400, WXGA800, QVGA     ABIs : armeabi-v7a, mips, x86----------id: 19 or "Google Inc.:Google APIs:16"     Name: Google APIs     Type: Add-On     Vendor: Google Inc.     Revision: 3     Description: Android + Google APIs     Based on Android 4.1.2 (API level 16)     Libraries:      * com.google.android.media.effects (effects.jar)          Collection of video effects      * com.android.future.usb.accessory (usb.jar)          API for USB Accessories      * com.google.android.maps (maps.jar)          API for Google Maps     Skins: WQVGA400, WVGA854, WSVGA, WXGA800-7in, WXGA720, HVGA, WQVGA432, QVGA, WVGA800 (default), WXGA800     ABIs : armeabi-v7a----------id: 20 or "android-17"     Name: Android 4.2.2     Type: Platform     API level: 17     Revision: 2     Skins: WVGA800 (default), HVGA, WXGA720, WVGA854, WSVGA, WXGA800-7in, WQVGA432, WQVGA400, WXGA800, QVGA     ABIs : armeabi-v7a, mips, x86----------id: 21 or "Google Inc.:Google APIs:17"     Name: Google APIs     Type: Add-On     Vendor: Google Inc.     Revision: 3     Description: Android + Google APIs     Based on Android 4.2.2 (API level 17)     Libraries:      * com.google.android.media.effects (effects.jar)          Collection of video effects      * com.android.future.usb.accessory (usb.jar)          API for USB Accessories      * com.google.android.maps (maps.jar)          API for Google Maps     Skins: WQVGA400, WVGA854, WSVGA, WXGA800-7in, WXGA720, HVGA, WQVGA432, QVGA, WVGA800 (default), WXGA800     ABIs : armeabi-v7a

这一步主要是获得 target id

c).$ android create avd -n android-arm-emulator -t 21 创建 emulator

android-sdk-linux$ android create avd -n android-arm-emulator -t 21Auto-selecting single ABI armeabi-v7aCreated AVD 'android-arm-emulator' based on Google APIs (Google Inc.), ARM (armeabi-v7a) processor,with the following hardware config:hw.lcd.density=240vm.heapSize=48hw.ramSize=512

创建好的emulator 位于~/.android 路径下面。

d).  运行 emulator

android-sdk-linux$ emulator -avd android-arm-emulator

e). $ android delete avd -n android-arm-emulator 删除 emulator

android-sdk-linux$ android delete avd -n android-arm-emulatorDeleting file /home/qiang/.android/avd/android-arm-emulator.iniDeleting folder /home/qiang/.android/avd/android-arm-emulator.avdAVD 'android-arm-emulator' deleted.

参考Android 官方Guide：

http://developer.android.com/tools/devices/managing-avds-cmdline.html

http://developer.android.com/tools/devices/emulator.html

2). 使用 source build emulator

a). 编译 emulator generic

$ . build/envsetup.sh && lunch full-eng && make -j 4

如果刚刚编译完，可以直接在编译的那个shell 中直接执行 $ emulator 运行 emulator

当然你不可能每次为了运行个emulator 都编译代码，所以可以按照下面的操作运行

b).  $ . build/envsetup.sh && lunch full-eng && emulator

如果想自己指定 system.img/userdata.img/ramdisk.img/kernel-qemu, etc 可以使用下面的命令：

$ . build/envsetup.sh && lunch full-eng && emulator -sysdir out/target/product/generic/ -system out/target/product/generic/system.img -ramdisk out/target/product/generic/ramdisk.img -data out/target/product/generic/userdata.img -kernel prebuilts/qemu-kernel/arm/kernel-qemu-armv7 -memory 512

参考 Android emulator help 信息：

$ emulator -help-build-images |less

$ emulator -help-build-images  The emulator detects that you are working from the Android build system  by looking at the ANDROID_PRODUCT_OUT variable in your environment.  If it is defined, it should point to the product-specific directory that  contains the generated system images.  In this case, the emulator will look by default for the following image  files there:    - system.img   : the *initial* system image.    - ramdisk.img  : the ramdisk image used to boot the system.    - userdata.img : the *initial* user data image (see below).    - kernel-qemu  : the emulator-specific Linux kernel image.  If the kernel image is not found in the out directory, then it is searched  in <build-root>/prebuilts/qemu-kernel/.  Skins will be looked in <build-root>/development/tools/emulator/skins/  You can use the -sysdir, -system, -kernel, -ramdisk, -datadir, -data options  to specify different search directories or specific image files. You can  also use the -cache and -sdcard options to indicate specific cache partition  and SD Card image files.  For more details, see the corresponding -help-<option> section.  Note that the following behaviour is specific to 'build mode':  - the *initial* system image is copied to a temporary file which is    automatically removed when the emulator exits. There is thus no way to    make persistent changes to this image through the emulator, even if    you use the '-image <file>' option.  - unless you use the '-cache <file>' option, the cache partition image    is backed by a temporary file that is initially empty and destroyed on    program exit.  SPECIAL NOTE: If you are using the emulator with the Android SDK, the  information above doesn't apply. See -help-sdk-images for more details.

emulator 默认是 arm 模拟器， 如果自己编译 linux kernel 的话，需要

$ git clone https://android.googlesource.com/kernel/goldfish.git