Java UsbConstants.USB_CLASS_AUDIO属性代码示例

/**
 * Request a device access permission if there is a MIDI interface in the device.
 *
 * @param device a USB device
 */
private void requestDevicePermissionIfNecessary(UsbDevice device) {
    for (UsbDevice d : mRequestedDevices) {
        if (d.getDeviceId() == device.getDeviceId()) {
            // It is already requested.
            return;
        }
    }

    for (int i = 0; i < device.getInterfaceCount(); ++i) {
        UsbInterface iface = device.getInterface(i);
        if (iface.getInterfaceClass() == UsbConstants.USB_CLASS_AUDIO
                && iface.getInterfaceSubclass() == UsbMidiDeviceAndroid.MIDI_SUBCLASS) {
            // There is at least one interface supporting MIDI.
            mUsbManager.requestPermission(device,
                    PendingIntent.getBroadcast(ContextUtils.getApplicationContext(), 0,
                            new Intent(ACTION_USB_PERMISSION), 0));
            mRequestedDevices.add(device);
            break;
        }
    }
}
 

/**
 * Constructs a UsbMidiDeviceAndroid.
 * @param manager
 * @param device The USB device which this object is assocated with.
 */
UsbMidiDeviceAndroid(UsbManager manager, UsbDevice device) {
    mConnection = manager.openDevice(device);
    mEndpointMap = new HashMap<Integer, UsbEndpoint>();
    mRequestMap = new HashMap<UsbEndpoint, UsbRequest>();

    for (int i = 0; i < device.getInterfaceCount(); ++i) {
        UsbInterface iface = device.getInterface(i);
        if (iface.getInterfaceClass() != UsbConstants.USB_CLASS_AUDIO ||
            iface.getInterfaceSubclass() != MIDI_SUBCLASS) {
            continue;
        }
        mConnection.claimInterface(iface, true);
        for (int j = 0; j < iface.getEndpointCount(); ++j) {
            UsbEndpoint endpoint = iface.getEndpoint(j);
            if (endpoint.getDirection() == UsbConstants.USB_DIR_OUT) {
                mEndpointMap.put(endpoint.getEndpointNumber(), endpoint);
            }
        }
    }
}
 

private static String nameForClass(UsbDevice usbDevice) {
    int classType = usbDevice.getDeviceClass();
    switch (classType) {
        case UsbConstants.USB_CLASS_AUDIO:
            return "Audio";
        case UsbConstants.USB_CLASS_CDC_DATA:
            return "CDC Control";
        case UsbConstants.USB_CLASS_COMM:
            return "Communications";
        case UsbConstants.USB_CLASS_CONTENT_SEC:
            return "Content Security";
        case UsbConstants.USB_CLASS_CSCID:
            return "Content Smart Card";
        case UsbConstants.USB_CLASS_HID:
            return "Human Interface Device";
        case UsbConstants.USB_CLASS_HUB:
            return "Hub";
        case UsbConstants.USB_CLASS_MASS_STORAGE:
            return "Mass Storage";
        case UsbConstants.USB_CLASS_MISC:
            return "Wireless Miscellaneous";
        case UsbConstants.USB_CLASS_PHYSICA:
            return "Physical";
        case UsbConstants.USB_CLASS_PRINTER:
            return "Printer";
        case UsbConstants.USB_CLASS_STILL_IMAGE:
            return "Still Image";
        case UsbConstants.USB_CLASS_VENDOR_SPEC:
            return String.format("Vendor Specific 0x%02x", classType);
        case UsbConstants.USB_CLASS_VIDEO:
            return "Video";
        case UsbConstants.USB_CLASS_WIRELESS_CONTROLLER:
            return "Wireless Controller";
        default:
            return "";
    }
}
 

public static String nameForClass(int classType) {
    switch (classType) {
        case UsbConstants.USB_CLASS_APP_SPEC:
            return String.format("Application Specific 0x%02x", classType);
        case UsbConstants.USB_CLASS_AUDIO:
            return "Audio";
        case UsbConstants.USB_CLASS_CDC_DATA:
            return "CDC Control";
        case UsbConstants.USB_CLASS_COMM:
            return "Communications";
        case UsbConstants.USB_CLASS_CONTENT_SEC:
            return "Content Security";
        case UsbConstants.USB_CLASS_CSCID:
            return "Content Smart Card";
        case UsbConstants.USB_CLASS_HID:
            return "Human Interface Device";
        case UsbConstants.USB_CLASS_HUB:
            return "Hub";
        case UsbConstants.USB_CLASS_MASS_STORAGE:
            return "Mass Storage";
        case UsbConstants.USB_CLASS_MISC:
            return "Wireless Miscellaneous";
        case UsbConstants.USB_CLASS_PER_INTERFACE:
            return "(Defined Per Interface)";
        case UsbConstants.USB_CLASS_PHYSICA:
            return "Physical";
        case UsbConstants.USB_CLASS_PRINTER:
            return "Printer";
        case UsbConstants.USB_CLASS_STILL_IMAGE:
            return "Still Image";
        case UsbConstants.USB_CLASS_VENDOR_SPEC:
            return String.format("Vendor Specific 0x%02x", classType);
        case UsbConstants.USB_CLASS_VIDEO:
            return "Video";
        case UsbConstants.USB_CLASS_WIRELESS_CONTROLLER:
            return "Wireless Controller";
        default:
            return String.format("0x%02x", classType);
    }
}
 

/**
 * Constructs a UsbMidiDeviceAndroid.
 * @param manager
 * @param device The USB device which this object is assocated with.
 */
UsbMidiDeviceAndroid(UsbManager manager, UsbDevice device) {
    mConnection = manager.openDevice(device);
    mEndpointMap = new SparseArray<UsbEndpoint>();
    mRequestMap = new HashMap<UsbEndpoint, UsbRequest>();
    mHandler = new Handler();
    mUsbDevice = device;
    mIsClosed = false;
    mHasInputThread = false;
    mNativePointer = 0;

    for (int i = 0; i < device.getInterfaceCount(); ++i) {
        UsbInterface iface = device.getInterface(i);
        if (iface.getInterfaceClass() != UsbConstants.USB_CLASS_AUDIO
                || iface.getInterfaceSubclass() != MIDI_SUBCLASS) {
            continue;
        }
        mConnection.claimInterface(iface, true);
        for (int j = 0; j < iface.getEndpointCount(); ++j) {
            UsbEndpoint endpoint = iface.getEndpoint(j);
            if (endpoint.getDirection() == UsbConstants.USB_DIR_OUT) {
                mEndpointMap.put(endpoint.getEndpointNumber(), endpoint);
            }
        }
    }
    // Start listening for input endpoints.
    // This function will create and run a thread if there is USB-MIDI endpoints in the
    // device. Note that because UsbMidiDevice is shared among all tabs and the thread
    // will be terminated when the device is disconnected, at most one thread can be created
    // for each connected USB-MIDI device.
    startListen(device);
}
 

private String getClassName(int deviceClass) {
    switch (deviceClass) {
        case UsbConstants.USB_CLASS_AUDIO:
            return this.getString(R.string.class_audio);
        case UsbConstants.USB_CLASS_CDC_DATA:
            return this.getString(R.string.class_cdc_data);
        case UsbConstants.USB_CLASS_COMM:
            return this.getString(R.string.class_comm);
        case UsbConstants.USB_CLASS_CONTENT_SEC:
            return this.getString(R.string.class_content_sec);
        case UsbConstants.USB_CLASS_HID:
            return this.getString(R.string.class_hid);
        case UsbConstants.USB_CLASS_HUB:
            return this.getString(R.string.class_hub);
        case UsbConstants.USB_CLASS_MASS_STORAGE:
            return this.getString(R.string.class_mass_storage);
        case UsbConstants.USB_CLASS_MISC:
            return this.getString(R.string.class_misc);
        case UsbConstants.USB_CLASS_PHYSICA:
            return this.getString(R.string.class_physica);
        case UsbConstants.USB_CLASS_PRINTER:
            return this.getString(R.string.class_printer);
        case UsbConstants.USB_CLASS_STILL_IMAGE:
            return this.getString(R.string.class_still_image);
        case UsbConstants.USB_CLASS_VIDEO:
            return this.getString(R.string.class_video);
        case UsbConstants.USB_CLASS_WIRELESS_CONTROLLER:
            return this.getString(R.string.class_wireless_controller);
        default:
            return this.getString(R.string.class_unknown);
    }
}
 

/**
 * Enumerates USB-MIDI devices.
 * If there are devices having USB-MIDI interfaces, this function requests permission for
 * accessing the device to the user.
 * When the permission request is accepted or rejected onRequestDone will be called.
 *
 * If there are no USB-MIDI interfaces, this function returns false.
 * @return true if some permission requests are in progress.
 */
@CalledByNative
boolean enumerateDevices(Context context) {
    mUsbManager = (UsbManager)context.getSystemService(Context.USB_SERVICE);
    Map<String, UsbDevice> devices = mUsbManager.getDeviceList();
    PendingIntent pendingIntent = PendingIntent.getBroadcast(
            context, 0, new Intent(ACTION_USB_PERMISSION), 0);
    mRequestedDevices = new HashSet<UsbDevice>();
    for (UsbDevice device : devices.values()) {
        boolean found = false;
        for (int i = 0; i < device.getInterfaceCount() && !found; ++i) {
            UsbInterface iface = device.getInterface(i);
            if (iface.getInterfaceClass() == UsbConstants.USB_CLASS_AUDIO &&
                iface.getInterfaceSubclass() == UsbMidiDeviceAndroid.MIDI_SUBCLASS) {
                found = true;
            }
        }
        if (found) {
            mUsbManager.requestPermission(device, pendingIntent);
            mRequestedDevices.add(device);
        }
    }
    if (mRequestedDevices.isEmpty()) {
        // No USB-MIDI devices are found.
        return false;
    }

    IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
    mReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            if (ACTION_USB_PERMISSION.equals(intent.getAction())) {
                onRequestDone(context, intent);
            }
        }
    };
    context.registerReceiver(mReceiver, filter);
    return true;
}