Android: Detecting Usb

Android : how to detect already connected usb device?

Try this:

1. First register Broadcast for USB connection.
   manifest permission:

:

<intent-filter> <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" /> </intent-filter>

2. Get the List of USB Device with details by using this

   public void getDetail() {
   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();
   
       manager.requestPermission(device, mPermissionIntent);
       String Model = device.getDeviceName();
   
       int DeviceID = device.getDeviceId();
       int Vendor = device.getVendorId();
       int Product = device.getProductId();
       int Class = device.getDeviceClass();
       int Subclass = device.getDeviceSubclass();
   
   }}
   

Detect connected USB device

You should use a USB_DEVICE_ATTACHED intent in your manifest. To get your app automatically started when the device is attached you should also specify a device_filter.xml

<activity ...>
...
    <intent-filter>
        <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
    </intent-filter>

    <meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
        android:resource="@xml/device_filter" />
</activity>

You can find more instructions here

Android: Detecting USB

Some people suggested using UMS_CONNECTED which is deprecated as of recent version of Android
The other problem with that is that it does not work with MTP enabled devices

Others suggested the use of the BatteryManager, more precisely ACTION_BATTERY_CHANGED as well as BATTERY_PLUGGED_AC and BATTERY_PLUGGED_USB
This is perfect if you want to detect the Battery or Charging status of the device, but is not a really good indicator of a USB connection.
Using the battery manager is prone to failure on older android tablets such as the XOOM, the ICONIA tab A510, and the older Asus tablets.

To purely detect that the device was plugged on a PC you can:
Use android.hardware.usb.action.USB_STATE and connected
in place of the BatteryManager stuff

Code sample

public static boolean isConnected(Context context) {
        intent = context.registerReceiver(null, new IntentFilter("android.hardware.usb.action.USB_STATE"));
        return intent.getExtras().getBoolean("connected");
    }

Hope this helps

Android: Detect USB flash drive plugged in

Android, at the SDK level, has no concept of USB drives. There are no rules for where they should be mounted, broadcasts for when they appear/disappear, etc. Perhaps some standardization in this area will come in future Android releases, but it is not there today.

detecting usb devices android

Edit2:

trying to connect a samsung hard keyboard to a samsung tablet

If I am not mistaken: Problem is that a keyboard is not an USB Acessory and should therefore not trigger the USB_ACCESSORY_ATTACHED part.

forget the part below :)

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try replacing

 UsbManager mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
//final String ACTION_USB_PERMISSION ="com.android.example.USB_PERMISSION";

PendingIntent mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(mUsbReceiver, filter);

with

IntentFilter filter = new IntentFilter("android.hardware.usb.action.USB_ACCESSORY_ATTACHED");
registerReceiver(mUsbReceiver, filter);

and remove

<action android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED" />

from your AndroidManifest.xml

You are confusing permissions with broadcast intents.

Edit: Uhm likely this is completely wrong: http://developer.android.com/guide/topics/usb/accessory.html does what you do.

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