Thanks for giving your point of view ,and i had seen this issue before i tested,
however the USB device which i pluged in ( i have ported the Android- x86 to my develop-board) actually worked well except it couldn't be mounted automatically. After i mounted the USB manually to the "/ sdcard" i could read data from the USB ( playback the music in it . etc). So i think it could act as a USB host througn my test result.Although i don't know more details about the reason . my Android's version is 1.5. I think that it uses the Linux kernel so if the Linux kernel could surport the USB we could say Android also surport the USB . Am i right? I am a freshman of the LINUX and Android so all these are my surmises. Besides i checked the source code of the Android . And i found there are some files in the kernel like "AutoMount.c" and "Mount.c" . Looked through these file I guess Android could get the message that a new USB device plug-in from the process "Mountd". And after that it could try to mount this device to an appointed path. In my test , after i plug-in the USB device i surely found that the process "Mountd" created a new device in "/dev/block/sdc" and after that this process tried mount the device to "/sdcard" .All these information the system printed on the CLI screen as LOG.But that is all, no sucess ,no failure ,and no more information about the process . I checked but the device was not mounted successfully. So i tried to mount the device by myself and suceed. the problem puzzled me and made me crazy.Thanks for helping me. PS: the souce code files I metioned just now(http:// android.git.kernel.org/?p=platform/system/ core.git;a=tree;f=mountd;h=529eeda616338dd8d5c7dfc1cb20475ccba97053;hb=77d0c65b950570edd5241a8f2ebecfc3acbc5135) disappeared in the latest project (http://android.git.kernel.org/? p=platform/system/core.git;a=tree) . I don't know when the codes were dropped and why. On 12月12日, 上午11时26分, Lance Nanek <[email protected]> wrote: > It's interesting that it tried to mount a USB device that was plugged > in. I thought Android would only act as a USB device, not a USB host, > as per this issue:http://code.google.com/p/android/issues/detail?id=738 > > Although there is a link on that page to some people using USB host > mode on Android that's been ported to Openmoko phones. > > On Dec 11, 9:16 pm, lidemin <[email protected]> wrote: > > > > > thanks a lot for this message, and i followed this to test again. > > > but after i inserted the SD card the system still had no message to > > send out. > > > and again i checked the info about the LOG in the CLI, found that the > > "mountd" process had found the device ( like when i inserted the USB > > device ) and tried to mount this device to "/sdcard" .However the LOG > > had no more message about the mount result , and i didn't know > > whether there is an error or not. I only had to check the "sdcard" > > folder but found nothing in it. And i tried to mount this device to > > this path manually and succeed. But still had no intent > > (android.intent.action.MEDIA_MOUNTED ) to send out by system . > > > did anyone get it( the system message about detecting the external > > device ) on the mobile or the other devices? > > > Or should i send this question to android-porting? And thank you all. > > > On 12月12日, 上午4时29分, Paul Turchenko <[email protected]> wrote: > > > > Only thing I can state is thatandroid.intent.action.MEDIA_MOUNTED is > > > for SD card being inserted... My guess is that forUSBdevice > > > discovery you'll have to dig something more low-level. > > > > On Dec 11, 8:45 am, lidemin <[email protected]> wrote: > > > > > hi all, > > > > now i have ported theAndroidto a x86 platform. > > > > And i want todetecttheUSBplug-in.But follow the information about > > > > theandroid.intent.action.MEDIA_MOUNTED > > > > in the SDK's DOC, i can't receive the event of theUSB'splug-in. > > > > > i have checked my code and it can receive the other event ( ps:intent > > > > action) . > > > > > Besides, in the CLI, i could mount theUSBdeviceto /sdcard but it > > > > couldn't mount automatically. > > > > > have seen some source code about the mount and mountlistener and it > > > > should be effective. > > > > > who can tell me what the problem is? and my SDK's version is 1.5.- > > > > 隐藏被引用文字 - > > > > - 显示引用的文字 -- 隐藏被引用文字 - > > - 显示引用的文字 - -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
