对Android的模拟器，如果要修改其system分区里的文件，除了remount之外，还需要对数据进行持久化——因为默认情况下emulator会以只读的形式加载system.img，即便remount之后对其进行的修改也不会实际被保存下来。

下面介绍一种简单的方法对数据进行持久化：

1. 创建一个AVD，在这个例子里，我们用Android 4.3.1，命名为Android4.3.1。

2. 将SDK(E:\Android\sdk\system-images\android-18\default\armeabi-v7a)下这个系统的system.img,kernel-qemu,ramdisk.img文件拷贝至emulator的目录下一份E:\Android\sdk\.android\avd\Android4.3.1.avd.目录结构如下：



3.修改hardware-qemu.ini文件的kernel.path，disk.ramdisk.path ，disk.systemPartition.initPath字段路径

hw.cpu.arch = arm  
hw.cpu.model = cortex-a8  
hw.cpu.ncore = 2  
hw.ramSize = 500  
hw.screen = touch  
hw.mainKeys = true  
hw.trackBall = false  
hw.keyboard = true  
hw.keyboard.lid = false  
hw.keyboard.charmap = qwerty2  
hw.dPad = false  
hw.gsmModem = true  
hw.gps = true  
hw.battery = true  
hw.accelerometer = true  
hw.audioInput = true  
hw.audioOutput = true  
hw.sdCard = true  
hw.sdCard.path = E:\Android\sdk\.android\avd\Android4.3.1.avd/sdcard.img  
disk.cachePartition = true  
disk.cachePartition.path = E:\Android\sdk\.android\avd\Android4.3.1.avd/cache.img  
disk.cachePartition.size = 66m  
hw.lcd.width = 480  
hw.lcd.height = 800  
hw.lcd.depth = 16  
hw.lcd.density = 240  
hw.lcd.backlight = true  
hw.gpu.enabled = false  
hw.gpu.mode = auto  
hw.gpu.blacklisted = no  
hw.initialOrientation = portrait  
hw.camera.back = none  
hw.camera.front = none  
vm.heapSize = 32  
hw.sensors.light = true  
hw.sensors.pressure = true  
hw.sensors.humidity = true  
hw.sensors.proximity = true  
hw.sensors.magnetic_field = true  
hw.sensors.orientation = true  
hw.sensors.temperature = true  
hw.useext4 = true  
kernel.path = E:\Android\sdk\.android\avd\Android4.3.1.avd\/kernel-qemu  
kernel.parameters =  androidboot.hardware=goldfish android.checkjni=1  
kernel.newDeviceNaming = no  
kernel.supportsYaffs2 = yes  
disk.ramdisk.path = E:\Android\sdk\.android\avd\Android4.3.1.avd\/ramdisk.img  
disk.systemPartition.initPath = E:\Android\sdk\.android\avd\Android4.3.1.avd\/system.img  
disk.systemPartition.size = 218m  
disk.dataPartition.path = E:\Android\sdk\.android\avd\Android4.3.1.avd/userdata-qemu.img  
disk.dataPartition.size = 500m  
avd.name = Android4.3.1  

4. 手工指定挂载参数地启动它：

C:\Users\Administrator>emulator -avd Android4.3.1 -qemu -nand system,size=0x1f400000,file=E:\Android\sdk\.android\avd\Android4.3.1.avd\system.img  

其中，0x1f400000是指给/system分区500MB的空间。

4. 系统启动后，adb remount一下，然后通过adb shell mount可以看到system分区已经变为rw了。

C:\Users\Administrator>adb shell mount  
rootfs / rootfs ro 0 0  
tmpfs /dev tmpfs rw,nosuid,mode=755 0 0  
devpts /dev/pts devpts rw,mode=600 0 0  
proc /proc proc rw 0 0  
sysfs /sys sysfs rw 0 0  
none /acct cgroup rw,cpuacct 0 0  
tmpfs /mnt/secure tmpfs rw,mode=700 0 0  
tmpfs /mnt/asec tmpfs rw,mode=755,gid=1000 0 0  
tmpfs /mnt/obb tmpfs rw,mode=755,gid=1000 0 0  
none /dev/cpuctl cgroup rw,cpu 0 0  
/dev/block/mtdblock0 /system yaffs2 rw 0 0  
/dev/block/mtdblock2 /data yaffs2 rw,nosuid,nodev 0 0  
/dev/block/mtdblock3 /cache yaffs2 rw,nosuid,nodev 0 0  
/dev/block/vold/179:0 /storage/sdcard vfat rw,dirsync,nosuid,nodev,noexec,uid=10  
00,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset=iso8  
859-1,shortname=mixed,utf8,errors=remount-ro 0 0  
/dev/block/vold/179:0 /mnt/secure/asec vfat rw,dirsync,nosuid,nodev,noexec,uid=1  
000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset=iso  
8859-1,shortname=mixed,utf8,errors=remount-ro 0 0  
tmpfs /storage/sdcard/.android_secure tmpfs ro,size=0k,mode=000 0 0  

5. 现在可以对/system分区做持久化修改。

6. 修改完成后，关掉模拟器。之后启动即可。

emulator 参数说明：
C:\Users\Administrator>emulator -help-disk-images

  The emulator needs several key image files to run appropriately.
  Their exact location depends on whether you're using the emulator
  from the Android SDK, or not (more details below).

  The minimal required image files are the following:

    kernel-qemu      the emulator-specific Linux kernel image
    ramdisk.img      the ramdisk image used to boot the system
    system.img       the *initial* system image
    userdata.img     the *initial* data partition image

  It will also use the following writable image files:

    userdata-qemu.img  the persistent data partition image
    system-qemu.img    an *optional* persistent system image
    cache.img          an *optional* cache partition image
    sdcard.img         an *optional* SD Card partition image

    snapshots.img      an *optional* state snapshots image

  If you use a virtual device, its content directory should store
  all writable images, and read-only ones will be found from the
  corresponding platform/add-on directories. See -help-sdk-images
  for more details.

  If you are building from the Android build system, you should
  have ANDROID_PRODUCT_OUT defined in your environment, and the
  emulator shall be able to pick-up the right image files automatically.
  See -help-build-images for more details.

  If you're neither using the SDK or the Android build system, you
  can still run the emulator by explicitely providing the paths to
  *all* required disk images through a combination of the following
  options: -sysdir, -datadir, -kernel, -ramdisk, -system, -data, -cache
  -sdcard and -snapstorage.

  The actual logic being that the emulator should be able to find all
  images from the options you give it.

  For more detail, see the corresponding -help-<option> entry.

  Other related options are:

      -init-data       Specify an alternative *initial* user data image

      -wipe-data       Copy the content of the *initial* user data image
                           (userdata.img) into the writable one (userdata-qemu.img)

      -no-cache        do not use a cache partition, even if one is available.

      -no-snapstorage  do not use a state snapshot image, even if one is available.

参考：http://bbs.pediy.com/showthread.php?p=1229289#post1229289

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