I wouldn't take this as a rule, but more of a guideline: Phones don't do host-mode and tablets do (With exceptions). You may be better off trying to connect your sensor to an ADK than to a device.
On Aug 29, 4:47 am, Kiran <[email protected]> wrote: > Hi All, > I have a USB based sensor that would draw about 300mA and would like to use > it with my Android phone. I have tried to play around with the API's and > write a small application that would just list out the devices that were > connected to the USB bus. > > A small code snippet that I am trying to use to print out the connected > devices is: > > ***** > EditText lsusbText = (EditText) findViewById(R.id.lsusbTextID); > lsusbText.setText(""); > Log.i(TAG, "Querying USB devices"); > > UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE); > HashMap<String, UsbDevice> deviceList = manager.getDeviceList(); > Iterator<UsbDevice> deviceIterator = deviceList.values().iterator(); > while(deviceIterator.hasNext()){ > UsbDevice device = deviceIterator.next(); > //your code > lsusbText.append(device.getDeviceName()); > > } > > My manifest has: > <uses-feature android:name="android.hardware.usb.host" /> > > <intent-filter> > <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" /> > </intent-filter> > > ***** > > I noticed that the results are not showing any devices connected. After > researching a bit and poking around in the forums, it seems that only > specific hardware devices support USB Host mode. I have a Samsung Nexus S > phone, and am inclined to believe that this phone does not support the USB > host mode? I also tried plugging in a mouse via an OTG adapter, but the > USB mouse didn't receive power after it was plugged in. The Android API's > also suggest this: > "Note: Support for USB host and accessory modes are ultimately dependant on > the device's hardware, regardless of platform level." > Is there a listing of the Android powered devices that support USB host > mode? Also, out of curiosity, why is there a hardware requirement for USB > host? Is it the specific type of USB connector that the phone has (Micro-A > vs Micro-B)? Is it something related to the USB Bus power? Any > information regarding the hardware requirements, which devices currently > support this, etc would be great. I also found that there is a libusb port > to Android, which would allow access at a lower level. However, this would > potentially still require the hardware to support the USB host mode. > Additionally, I have seen things about a kernel mod required. I'm > guessing the kernel stuff was for older image releases, and that Android > 4.1 has this kernel mod built in. > > I unfortunately found that the documentation for WiFi direct is similarly > ambiguous in that although WiFi direct is something that is enabled and > available for use in the API, the hardware may not support it. However, I > haven't found any documentation which tells developers which devices > support/don't support the functionality. > > Thanks in advance, > Kiran -- 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
