private boolean connectDevice() {
if (mRunning) {
return true;
} else {
UsbAccessory[] accessories = mUsbManager.getAccessoryList();
UsbAccessory accessory = (accessories == null ? null : accessories[0]);
Logger.d("onResume accessory:" + accessory);
if (accessory != null) {
if (mUsbManager.hasPermission(accessory)) {
Logger.d("onResume openAccessory START");
openAccessory(accessory);
} else {
Logger.d("permission ERROR?");
synchronized (mUsbManager) {
if (!mPermissionRequestPending) {
mUsbManager.requestPermission(accessory, mPermissionIntent);
mPermissionRequestPending = true;
}
}
}
return true;
} else {
Logger.d("not attachd USB.");
return false;
}
}
}
private void openAccessory(UsbAccessory accessory) {
Logger.d("openAccessory accessory:" + accessory.toString());
ParcelFileDescriptor fd = mUsbManager.openAccessory(accessory);
Logger.d("openAccessory fd:" + fd);
if (fd != null) {
mAccessory = accessory;
mUSBCon.start(fd, mUsbReceiveHandler);
mRunning = true;
} else {
Logger.d("accessory open fail");
}
}
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
UsbAccessory accessory = UsbManager.getAccessory(intent);
Logger.d("onReceive accessory:" + accessory);
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
openAccessory(accessory);
} else {
Logger.d("permission denied for accessory " + accessory);
}
mPermissionRequestPending = false;
}
} else if (UsbManager.ACTION_USB_ACCESSORY_DETACHED.equals(action)) {
UsbAccessory accessory = UsbManager.getAccessory(intent);
if (accessory != null && accessory.equals(mAccessory)) {
closeAccessory();
}
}
}