桌面java应用程序通过USB复制和传输android数据 [英] Desktop java app copy and transfer android data via USB
问题描述
我有一个桌面java应用程序，还有一个Android应用程序。两个应用程序一起工作。
I have a desktop java app, and also an android app. Two app work together.
桌面应用程序中的用户有一个按钮，用于启动设备数据应用程序与计算机应用程序之间的传输，反之亦然。
The user in desktop app have a button to launch the transfer between device data app to computer app and vice versa.
所以我需要用简单的USB线传输数据，没有互联网连接/ WiFi /蓝牙/ adb。
So I need to transfer data with a simple USB cable, and without internet connection/WiFi/Bluetooth/adb.
我找到两个Java在Windows上解决我的问题的MTP库，以及android的USB主机/附件功能：
I found two Java MTP library that works on Windows to resolve my problem, and the USB Host/accesory fonctionnality of android:
-
jMTP 成功识别我的Android设备，文件夹和其他内容
jMTP successfully recognizes my Android devices, folder, and other things
我已成功在计算机中传输文件--->设备，但我有错误当我尝试在设备中传输文件--->计算机
I have success to transfer a file in computer ---> device, but i have an error when i try to transfer a file in device ---> computer
我在解释后放了我的代码。
I put my code after the explaination.
jusbpmp 但我无法转移设备--->电脑。
jusbpmp but i don't have the possibility to transfer device ---> computer.
USB主机/附件无用，因为传输是从桌面应用程序启动的，当我阅读时在android开发者指南网站上，它似乎与我需要的不一致，或者可能是用户从设备开始传输。
USB Host/accesory not usefull because transfer are launch from desktop app, and when i read on the android developper guide website, it seems to be not correspond from what i need, or maybe if the user start transfer from the device.
我尝试从1周到此任务成功，但似乎我需要帮助。
I try from 1 week to success in this task but it seems i need help.
Java + jMTP代码
Java + jMTP code
private static void jMTPeMethode()
{
PortableDeviceManager manager = new PortableDeviceManager();
PortableDevice device = manager.getDevices()[0];
// Connect to USB tablet
device.open();
System.out.println(device.getModel());
System.out.println("---------------");
// Iterate over deviceObjects
for (PortableDeviceObject object : device.getRootObjects())
{
// If the object is a storage object
if (object instanceof PortableDeviceStorageObject)
{
PortableDeviceStorageObject storage = (PortableDeviceStorageObject) object;
for (PortableDeviceObject o2 : storage.getChildObjects())
{
if(o2.getOriginalFileName().equalsIgnoreCase("Test"))
{
//Device to computer not working
PortableDeviceToHostImpl32 copy = new PortableDeviceToHostImpl32();
try
{
copy.copyFromPortableDeviceToHost(o2.getID(), "C:\\TransferTest", device);
} catch (COMException ex)
{
}
// //Host to Device working
// BigInteger bigInteger1 = new BigInteger("123456789");
// File file = new File("c:/GettingJMTP.pdf");
// try {
// storage.addAudioObject(file, "jj", "jj", bigInteger1);
// } catch (Exception e) {
// //System.out.println("Exception e = " + e);
// }
}
System.out.println(o2.getOriginalFileName());
}
}
}
manager.getDevices()[0].close();
}
这是代码和错误的结果
`
Nexus 9
---------------
Music
Podcasts
Ringtones
Alarms
Notifications
Pictures
Movies
Download
DCIM
Android
! Failed to get IStream (representing object data on the device) from IPortableDeviceResources, hr = 0x80070057
test
ReleveData
`
我在互联网上读到0x80070057是一个通用的Windows异常。
I read in internet 0x80070057 is a generic windows exception .
编辑：
Windows网站说小时错误
ERROR_INVALID_PARAMETER 0x80070057：
应用程序提供的参数无效。
Windows site say for the hr error ERROR_INVALID_PARAMETER 0x80070057 : The parameter supplied by the application is not valid.
但是我没有看到女巫参数无效
But i don't see witch parameter is not valid
这是 link C类的库用于将数据设备传输到计算机，你可以看到我的错误行230.
Here is the link of C class of the library use for transfer data device to computer, you can see my error line 230.
和这是我使用的jMTP库。
And this is the jMTP library i use.
你能帮助我，还是用其他方式去做我需要的东西（Usb4Java，libUSB）？我将非常感激。
Can you help me, or purpose an other way to do what i need(Usb4Java, libUSB) ? I shall be really grateful.
感谢提前。
推荐答案
好的，我发现了问题。
问题来自 o2.getID（）参数给出的方法 copy.copyFromPortableDeviceToHost 。
The problem come from o2.getID() parameter give to the methode copy.copyFromPortableDeviceToHost.
因为 o2 代表文件夹，而不是文件夹中的文件，因此无法发送文件夹，为了成功，我需要在文件夹中发送文件。
Because o2 representing the folder, and not the file in the folder, so it's not possible to send folder, for success i need to send file in folder.
所以我投了 PortableDeviceObject o2到 PortableDeviceFolderObject ，以便获取带有 targetFolder.getChildObjects（）在 PortableDeviceFolderObject 表示文件'然后我可以从文件夹迭代任何子对象。
So i cast my PortableDeviceObject o2 to an PortableDeviceFolderObject, so that get a list of child Object with targetFolder.getChildObjects() in the PortableDeviceFolderObject representing files' and then i can iterate on any child objet from the folder.
对于每个文件，我使用正确的id调用方法 copy.copyFromPortableDeviceToHost 。
And for each file i call the methode copy.copyFromPortableDeviceToHost, with the right id.
这是更正代码，从计算机复制/传输文件到开发冰和设备到计算机。
Here is the correction code, copy/transfer file from computer to device and device to computer.
我希望它有所帮助。
public class USBTransfertMain {
public static void main(String[] args) throws Throwable {
jMTPeMethode();
}
private static void jMTPeMethode()
{
PortableDeviceFolderObject targetFolder = null;
PortableDeviceManager manager = new PortableDeviceManager();
PortableDevice device = manager.getDevices()[0];
// Connect to USB tablet
device.open();
System.out.println(device.getModel());
System.out.println("---------------");
// Iterate over deviceObjects
for (PortableDeviceObject object : device.getRootObjects())
{
// If the object is a storage object
if (object instanceof PortableDeviceStorageObject)
{
PortableDeviceStorageObject storage = (PortableDeviceStorageObject) object;
for (PortableDeviceObject o2 : storage.getChildObjects())
{
if(o2.getOriginalFileName().equalsIgnoreCase("testFolder"))
{
targetFolder = (PortableDeviceFolderObject) o2;
}
System.out.println(o2.getOriginalFileName());
}
copyFileFromComputerToDeviceFolder(targetFolder);
PortableDeviceObject[] folderFiles = targetFolder.getChildObjects();
for (PortableDeviceObject pDO : folderFiles) {
copyFileFromDeviceToComputerFolder(pDO, device);
}
}
}
manager.getDevices()[0].close();
}
private static void copyFileFromDeviceToComputerFolder(PortableDeviceObject pDO, PortableDevice device)
{
PortableDeviceToHostImpl32 copy = new PortableDeviceToHostImpl32();
try {
copy.copyFromPortableDeviceToHost(pDO.getID(), "C:\\TransferTest", device);
} catch (COMException ex) {
ex.printStackTrace();
}
}
private static void copyFileFromComputerToDeviceFolder(PortableDeviceFolderObject targetFolder)
{
BigInteger bigInteger1 = new BigInteger("123456789");
File file = new File("C:\\GettingJMTP.pdf");
try {
targetFolder.addAudioObject(file, "jj", "jj", bigInteger1);
} catch (Exception e) {
System.out.println("Exception e = " + e);
}
}
}
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