Thanks a lot to help me. I will try to understand what you said . Do you mean Android couldn't detect the USB plug-in and mount it automatically until now? Or in other words, the SDK doesn't surport that.
Then how should i understand the "android.intent.action.MEDIA_MOUNTED" ? How to use it and when？If I plug-in the SD-card Android would detect it and notice that? because i try to insert my SD also, and the result is same to the USB. I have no Gphone aside, so i want to know if I insert a SD card into the GPhone and will the system send the Intent "android.intent.action.MEDIA_MOUNTED" ? Thank you again for your reply. ^_^ On 12月12日, 下午4时02分, Lance Nanek <[email protected]> wrote: > Yeah, but if Android doesn't use USB except to act as a USB device > externally and do things like talk to the SD card slot internally, > then expecting an intent to be sent when any USB device is plugged in > might be a bit much. > > A general Linux approach, like listening for the DeviceAdded signal > from D-Bus, rather than something Android specific might be needed. > Although that "on device-added" trigger under the Android Init > Language heading in the platform dev guide looks > interesting:http://pdk.android.com/online-pdk/guide/bring_up.html#androidInitLang... > > It might be better to ask in the android-platform, android-porting, or > android-ndk groups. USB doesn't seem to be something the SDK currently > covers. > > On Dec 12, 12:29 am, lidemin <[email protected]> wrote: > > > > > 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=77d0-c65b950570edd5241a8f2ebecfc3acbc5135) > > 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 -- 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. 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