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Managed to get intent-filter working. Problem is that when powering the tablet it will query from user permission to startup application. So i still get query once. Problem is that i have 2 USB devices and it gives permission to first one. – Jude
Sorry I cannot post a comment, but what I saw was requesting permission onCreate() was requesting only once. However requesting in onResume() worked well for multiple devices! I got multiple dialogs and further, the dialog count doesn't match with the log statements of permission granted as well. So for example, I will request permission for one camera device and one other device just once.
However, I get 2 dialogs for camera and 2 dialogs for the other device, and multiple logs statements every time I accepted. Like for 2 dialogs I got 4 permission granted statements, so it's kinda hard to tell what exactly is going on internally. And those messages are not consistent every time. Sometimes I got 4 messages for 2 dialogs and sometimes I got 3 or 5 messages.
But for your reference I will attach my code which is working perfectly and I can receive permission for both the devices I'm trying to work with,
private static final String TAG = "BLH/USBTest";
private static final String ACTION_USB_PERMISSION = "com.blhealthcare.example.USB_PERMISSION";
private static final int CAM_USB_PERM_CODE = 4532;
private static final int STETH_USB_PERM_CODE = 4533;
UsbManager usbManager;
UsbDevice camDevice;
UsbDevice stethDevice;
List<UsbInterface> camInterfaces = new ArrayList<>();
List<UsbInterface> stethInterfaces = new ArrayList<>();
private boolean camPermGranted = false;
private boolean stethPermGranted = false;
private final BroadcastReceiver usbReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
int reqCode = intent.getIntExtra("requestCode", 0);
if (ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
UsbDevice device = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
if (device != null) {
if (reqCode == CAM_USB_PERM_CODE) {
Log.d(TAG, "onReceive: Permission granted for Camera");
camPermGranted = true;
} else if (reqCode == STETH_USB_PERM_CODE) {
Log.d(TAG, "onReceive: Permission granted for Steth");
stethPermGranted = true;
}
}
} else {
Log.d(TAG, "Permission denied for device " + device);
}
}
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
initializeUSBDevices();
checkUSBInput();
}
// Helpers
private void requestCamPerm(Context context) {
Intent camIntent = new Intent(ACTION_USB_PERMISSION);
camIntent.putExtra("requestCode", CAM_USB_PERM_CODE);
PendingIntent camPermIntent = PendingIntent.getBroadcast(context, CAM_USB_PERM_CODE, camIntent, 0);
usbManager.requestPermission(camDevice, camPermIntent);
}
private void requestStethPerm(Context context) {
Intent stethIntent = new Intent(ACTION_USB_PERMISSION);
stethIntent.putExtra("requestCode", STETH_USB_PERM_CODE);
PendingIntent stethPermIntent = PendingIntent.getBroadcast(context, STETH_USB_PERM_CODE, stethIntent, 0);
usbManager.requestPermission(stethDevice, stethPermIntent);
}
private void initializeUSBDevices() {
String camvId = "4f2";
String stethvId = "d8c";
camDevice = getUsbDeviceFromVid(camvId);
stethDevice = getUsbDeviceFromVid(stethvId);
}
private UsbDevice getUsbDeviceFromVid(String vid) {
UsbManager usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
if (usbManager != null) {
for (UsbDevice d : usbManager.getDeviceList().values()) {
if (Integer.toHexString(d.getVendorId()).equals(vid)) {
// Log.d(TAG, "USBDevices: Found Device VID: " + vid);
return d;
}
}
}
return null;
}
@Override
protected void onResume() {
super.onResume();
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(usbReceiver, filter);
requestCamPerm(this);
requestStethPerm(this);
}
Oh and by the way, I haven't provided anything extra in the manifest, like vendorId etc. Just one thing,
<uses-feature android:name="android.hardware.usb.host"/>
EDIT* - Finally got it.
So like everyone has mentioned,
- Do not use USB Host API Call UsbManager.requestPermission()
- Create your device-filter via xml under resources and add that to meta-data in manifest. Must use INTEGER IDs only, no hex.
- Finally make sure your add this under your activity
android:directBootAware="true"
persists after reboot
