Hi, You are correct. I downloaded the App that you mentioned and my mouse did not show up in the Android column. However, my USB sensor that I want to interface did, so the code worked.
Thanks for the App suggestion, it really helped. Kiran On Mon, Oct 29, 2012 at 4:06 AM, al <achim.leub...@googlemail.com> wrote: > HI, > > first: USB-Host including the USB-Host api works for me on the Nexus 7 - > no root required. > > You could try an app like "USB Device Info" to validate your hardware > setup (usb adapter etc.). > > I have setup intents and filters, but I also assume they are not necessary > if you scan for devices yourself. > As I understand it, you just tried a mouse and a phone? I just made a test > with a mouse and though "USB Device Info" saw it on the "linux" tab, it did > not see it on the "android" tab. My app also did not see the mouse. I > assume since android handles the mouse itself, it does not make it visible > to the app. > > I.e. try another usb device. If you can see it on the Android tab in "USB > Device Info", you probably should see it in your app. > > Am Sonntag, 28. Oktober 2012 23:41:04 UTC+1 schrieb Kiran: > >> Hi All, >> I recently bought a Nexus 7 for USB development. I would like to use the >> USB Host functionality provided by the new Android OS. I was following the >> USB Host Tutorial at the link: http://developer.** >> android.com/guide/topics/**connectivity/usb/host.html<http://developer.android.com/guide/topics/connectivity/usb/host.html> >> . >> >> My program is very simple, and here are the relevant parts of the code: >> >> * private UsbManager manager; >> * >> * * >> * public void onCreate(Bundle savedInstanceState) {* >> * super.onCreate(savedInstanceState);* >> * setContentView(R.layout.activity_main);* >> * * >> * Log.i(TAG, "in onCreate()");* >> * manager = (UsbManager) getSystemService(Context.USB_SERVICE);* >> * if(manager==null) {* >> * Log.i(TAG, "USB Manager is NULL");* >> * }* >> * else {* >> * Log.i(TAG, "USB Manager = " + manager);* >> * }* >> * }* >> * * >> * public void enumerateUSBDevices() {* >> * HashMap<String, UsbDevice> deviceList = manager.getDeviceList();* >> * Collection<UsbDevice> deviceCollection = deviceList.values();* >> * Iterator<UsbDevice> deviceIterator = deviceCollection.iterator();* >> * Log.i(TAG, "Number of connected USB Devices = " + >> deviceCollection.size());* >> * while(deviceIterator.hasNext()){* >> * UsbDevice device = deviceIterator.next();* >> * Log.i(TAG, device.getDeviceName());* >> * }* >> * }* >> >> >> When the enumerateUSBDevices function is called, it reports that the >> number of connected USB Devices = 0. I am using a USB OTG cable, and I >> know that the Nexus 7 is powering the connected USB Device because I >> plugged in a USB Mouse, and it works properly. I also plugged in another >> Android phone, and the Nexus 7 was confirmed to be powering the device. >> However, in both of these instances, the Android program says that there >> are no USB devices connected. I am unsure what is going wrong in my code. >> In my Android manifest, I have the following line: >> >> *<uses-feature android:name="android.hardware.usb.host" />* >> >> My manifest does not have any intent filters associated with any USB >> devices. My understanding based on reading the tutorials is that the >> intent filters need to be in the Manifest only if you want the APP to be >> notified when the USB device is connected after the App is running? >> >> Can anybody shed light into what I may be doing wrong? Do I need to root >> my device? >> >> Thanks, >> Kiran >> > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to android-developers@googlegroups.com > To unsubscribe from this group, send email to > android-developers+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
