USBCore

java.lang.Object
- ohos.usb.USBCore

```
public class USBCore
extends Object
```
This class allows you to obtain USB devices currently attached, obtain USB device status, and communicate with USB devices. Currently, only the host mode is supported.

从以下版本开始:

5

SystemCapability

SystemCapability.Usb#USB_MANAGER

字段概要

字段
限定符和类型	字段	说明
`static String`	`ACTION_USB_DEVICE_ATTACHED`	Indicates a common event for attaching a USB device.
`static String`	`ACTION_USB_DEVICE_DETACHED`	Indicates a common event for detaching a USB device.
`static String`	`EXTRA_DEVICE`	Indicates additional device data.
`static String`	`EXTRA_PERMISSION_GRANTED`	Indicates that the access permission is granted.

构造器概要

构造器
构造器说明

USBCore(Context context)
A constructor used to create a USBCore.

构造器
构造器	说明
`USBCore(Context context)`	A constructor used to create a `USBCore`.

方法概要

所有方法静态方法实例方法具体方法
限定符和类型	方法	说明
`USBDevicePipe`	`connectDevice(USBDevice device)`	Opens a USB device based on device information returned by `getDevices()`.
`HashMap<String,USBDevice>`	`getDevices()`	Returns the hash map of USB devices.
`boolean`	`hasRight(USBDevice device)`	Returns true if the caller has right to access the device.
`void`	`requestRight(USBDevice device, String intentName)`	Requests temporary permission for the given package to access the device.
`static long`	`usbFunctionsFromString(String functions)`	Parses a string of usb functions that are comma separated.
`static String`	`usbFunctionsToString(long functions)`	Converts the given function mask to string.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - ACTION_USB_DEVICE_ATTACHED
```
public static final String ACTION_USB_DEVICE_ATTACHED
```
    Indicates a common event for attaching a USB device.
    After subscribing to this event, an application receives a notification and get the corresponding device information when a USB device is attached.
    
    从以下版本开始:
    
    5
    
    另请参阅:
    
    常量字段值
  - ACTION_USB_DEVICE_DETACHED
```
public static final String ACTION_USB_DEVICE_DETACHED
```
    Indicates a common event for detaching a USB device.
    After subscribing to this event, an application receives a notification and performs the corresponding action when a USB device is detached.
    
    从以下版本开始:
    
    5
    
    另请参阅:
    
    常量字段值
  - EXTRA_DEVICE
```
public static final String EXTRA_DEVICE
```
    Indicates additional device data.
    It is additional data contained in the ACTION_USB_DEVICE_ATTACHED and ACTION_USB_DEVICE_DETACHED common events.
    
    从以下版本开始:
    
    5
    
    另请参阅:
    
    常量字段值
  - EXTRA_PERMISSION_GRANTED
```
public static final String EXTRA_PERMISSION_GRANTED
```
    Indicates that the access permission is granted.
    This INTENT enumeration value is used for granting the USB access permission.
    
    从以下版本开始:
    
    5
    
    另请参阅:
    
    常量字段值
- 构造器详细资料
  - USBCore
```
public USBCore(Context context)
```
    A constructor used to create a USBCore.
    
    参数:
    
    context - Indicates the context of the calling ability.
    
    从以下版本开始:
    
    5
- 方法详细资料
  - getDevices
```
public HashMap<String,USBDevice> getDevices()
```
    Returns the hash map of USB devices.
    The hash map contains devices and their names. Applications can traverse USB devices in the hash map to perform operations on the devices. For details on the operations, see USBDevice.
    
    返回:
    
    Returns a hash map containing devices and their names.
    
    从以下版本开始:
    
    5
  - connectDevice
```
public USBDevicePipe connectDevice(USBDevice device)
```
    Opens a USB device based on device information returned by getDevices().
    A USBDevicePipe instance is returned. Data transfer is performed based on the instance.
    
    参数:
    
    device - Indicates a USBDevicePipe instance.
    
    返回:
    
    Returns a USBDevicePipe instance.
    
    从以下版本开始:
    
    5
  - hasRight
```
public boolean hasRight(USBDevice device)
```
    Returns true if the caller has right to access the device.
    
    参数:
    
    device - to check right for
    
    返回:
    
    true if caller has right to access this device
    
    从以下版本开始:
    
    5
  - requestRight
```
public void requestRight(USBDevice device,
                         String intentName)
```
    Requests temporary permission for the given package to access the device.
    
    参数:
    
    device - Device to request permissions for
    
    intentName - Intent for returning result
  - usbFunctionsToString
```
public static String usbFunctionsToString(long functions)
```
    Converts the given function mask to string. Maintains ordering with respect to init scripts.
    
    参数:
    
    functions - the usb functions long value
    
    返回:
    
    String representation of given mask
    
    从以下版本开始:
    
    5
  - usbFunctionsFromString
```
public static long usbFunctionsFromString(String functions)
```
    Parses a string of usb functions that are comma separated.
    
    参数:
    
    functions - the usb functions
    
    返回:
    
    A mask of all valid functions in the string
    
    从以下版本开始:
    
    5

类 USBCore

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

ACTION_USB_DEVICE_ATTACHED

ACTION_USB_DEVICE_DETACHED

EXTRA_DEVICE

EXTRA_PERMISSION_GRANTED

构造器详细资料

USBCore

方法详细资料

getDevices

connectDevice

hasRight

requestRight

usbFunctionsToString

usbFunctionsFromString