如何通过编程方式将文件从手机的内部存储器传输到USB驱动器?我没有获取外部目录所需的代码。
Caused by: org.hibernate.DuplicateMappingException: Table [coupons] contains physical column name [coup_id] referred to by multiple physical column names: [coupId], [coup_id]
上面发布的代码仅获取SD卡位置。如何访问USB驱动器?
答案 0 :(得分:1)
如何访问USB驱动器?
您可以注册广播以用于外部存储设备的即插即用:
Intent.ACTION_MEDIA_MOUNTED
Intent.ACTION_MEDIA_REMOVED
UsbReceiver:
class USBReceiver : BroadcastReceiver
{
public override void OnReceive(Context context, Intent intent)
{
string action = intent.Action;
if (action.Equals(Intent.ActionMediaMounted))
{
string mountPath = intent.Data.Path;
}
}
}
代码段:
UsbManager manager = (UsbManager)_mainActivity.GetSystemService(Context.UsbService);
var deviceList = manager.DeviceList;
IEnumerable<UsbDevice> deviceIterator = deviceList.Values.AsEnumerable();
if (deviceIterator.Count() > 0)
{
var device = deviceIterator.ElementAt(0);
ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";
var mPermissionIntent = PendingIntent.GetBroadcast(_mainActivity.ApplicationContext, 0, new Intent(ACTION_USB_PERMISSION), 0);
UsbManager mUsbManager = (UsbManager)_mainActivity.GetSystemService(Context.UsbService);
mUsbManager.RequestPermission(device, mPermissionIntent);
bool perm = mUsbManager.HasPermission(device);
if (perm)
{
//File Copy
File.Copy(FileNameSource, FileNameDestination);
}
}