android.hardware.USB類介紹

在最新的Android版本中，android.hardware.USB是一個新增類，提供了USB相關事件的插拔，以及狀態模式的廣播。這裡，可以看到USB連接、斷開、是否為U盤、ADB模式等等。定義如下

public class Usb {
    public static final String ACTION_USB_CONNECTED =
            "android.hardware.action.USB_CONNECTED";

     public static final String ACTION_USB_DISCONNECTED =
            "android.hardware.action.USB_DISCONNECTED";

    public static final String ACTION_USB_STATE =
            "android.hardware.action.USB_STATE";

    public static final String USB_CONNECTED = "connected";

    public static final String USB_FUNCTION_MASS_STORAGE = "mass_storage";

    public static final String USB_FUNCTION_ADB = "adb";

    public static final String USB_FUNCTION_RNDIS = "rndis";

    public static final String USB_FUNCTION_MTP = "mtp";

    public static final String USB_FUNCTION_ENABLED = "enabled";

    public static final String USB_FUNCTION_DISABLED = "disabled";