Android中的USB接口 [英] USB interface in android
问题描述
我将设备植根并在主机模式下工作.我可以检测到连接到我的标签页的USB设备，但是有两个问题.
I rooted my device and working in host mode. I can able to detect the usb device connected to my tab but Am having two questions.
1)我尝试使用显示我的设备名称device.getDeviceName();但它显示类似/dev/usb/002/002的内容我需要获取USB设备名称的制造商名称.我认为它可以在附件模式下使用，但我需要在主机模式下获得制造商名称.
1) i try to display my device name using device.getDeviceName(); but its showing something like/dev/usb/002/002 I need to get the manufacturer name of the usb device name. I thing its available in accessory mode but i need to get the manufacturer name in host mode.
2)我需要将一些数据从我的应用程序传输到android中的usb端口.我能够检测到该设备，但请帮助将某些数据或文件从我的Android应用程序传输到连接到USB端口的大容量存储中.
2)I need to transfer some data from my app to the usb port in android. i can able to detect the device but please help in transfering some data or file from my android app to mass storage connected to usb port.
推荐答案
可能您实际上需要阅读Raw USB Descriptor才能获取所需的数据.这是我出于个人目的编写的基本USB设备发现程序.提醒您，我正在寻找特定的设备(Dajac Easy I/O 1000数据采集系统)，但是您可以应用相同的原理.我确实向您展示了如何获取所需的数据.
Probably you will actually need to read the Raw USB Descriptors to get at the data you want. Here's a basic USB device discovery program I wrote for my own purposes. Mind you that I'm looking for a specific device (a Dajac Easy I/O 1000 data acquisition system) but you can apply the same principles. I do show you how to get the data you're looking for.
首先是代码.我的包是usbtest3，文件是MainActivity.java:
Here's the code first. My package is usbtest3, and the file is MainActivity.java:
package com.hotspotoffice.usbtest3;
// David Schofield, Hotspot Office, LLC., Pittsburgh, PA.
// Donations via PayPal always welcome! schofield (dot) david (at) verizon.net
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Iterator;
import android.os.Bundle;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.View;
import android.view.Menu;
import android.widget.Button;
import android.widget.TextView;
import android.hardware.usb.UsbConstants;
import android.hardware.usb.UsbManager;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbInterface;
public class MainActivity extends Activity {
protected static final int STD_USB_REQUEST_GET_DESCRIPTOR = 0x06;
// http://libusb.sourceforge.net/api-1.0/group__desc.html
protected static final int LIBUSB_DT_STRING = 0x03;
private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";
private Button btnDiscover;
private TextView txtInfo;
private PendingIntent mPermissionIntent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnDiscover=(Button)findViewById(R.id.btnDiscover);
txtInfo=(TextView)findViewById(R.id.txtInfo);
mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(mUsbReceiver, filter);
btnDiscover.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// txtInfo.setText("Button has been Pressed for "+(++i)+" Times.");
UsbManager manager = (UsbManager)getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
while(deviceIterator.hasNext()){
UsbDevice device = deviceIterator.next();
manager.requestPermission(device, mPermissionIntent);
txtInfo.append("Model:" + device.getDeviceName() + "\n");
txtInfo.append("DeviceID:" + device.getDeviceId() + "\n");
txtInfo.append("Vendor:" + device.getVendorId() + "\n");
txtInfo.append("Product:" + device.getProductId() + "\n");
txtInfo.append("Class:" + device.getDeviceClass() + "\n");
txtInfo.append("Subclass:" + device.getDeviceSubclass() + "\n");
txtInfo.append("Protocol:" + device.getDeviceProtocol() + "\n");
UsbInterface intf = device.getInterface(0);
int epc = 0;
epc = intf.getEndpointCount();
txtInfo.append("Endpoints:" + epc + "\n");
txtInfo.append("Permission:" + Boolean.toString(manager.hasPermission(device)) + "\n");
UsbDeviceConnection connection = manager.openDevice(device);
if(null==connection){
txtInfo.append("(unable to establish connection)\n");
} else {
// Claims exclusive access to a UsbInterface.
// This must be done before sending or receiving data on
// any UsbEndpoints belonging to the interface.
connection.claimInterface(intf, true);
// getRawDescriptors can be used to access descriptors
// not supported directly via the higher level APIs,
// like getting the manufacturer and product names.
// because it returns bytes, you can get a variety of
// different data types.
byte[] rawDescs = connection.getRawDescriptors();
String manufacturer = "", product = "";
try
{
byte[] buffer = new byte[255];
int idxMan = rawDescs[14];
int idxPrd = rawDescs[15];
int rdo = connection.controlTransfer(UsbConstants.USB_DIR_IN
| UsbConstants.USB_TYPE_STANDARD, STD_USB_REQUEST_GET_DESCRIPTOR,
(LIBUSB_DT_STRING << 8) | idxMan, 0, buffer, 0xFF, 0);
manufacturer = new String(buffer, 2, rdo - 2, "UTF-16LE");
rdo = connection.controlTransfer(UsbConstants.USB_DIR_IN
| UsbConstants.USB_TYPE_STANDARD, STD_USB_REQUEST_GET_DESCRIPTOR,
(LIBUSB_DT_STRING << 8) | idxPrd, 0, buffer, 0xFF, 0);
product = new String(buffer, 2, rdo - 2, "UTF-16LE");
} catch (UnsupportedEncodingException e)
{
e.printStackTrace();
}
txtInfo.append("Manufacturer:" + manufacturer + "\n");
txtInfo.append("Product:" + product + "\n");
txtInfo.append("Serial#:" + connection.getSerial() + "\n");
}
txtInfo.append("------------------------------------\n");
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
if(device != null){
//call method to set up device communication
}
}
else {
txtInfo.append("permission denied for device " + device);
}
}
}
}
};
}
我的清单文件包含USB主机设备支持的意图和要求:
My manifest file containing the intents and requirements for the USB Host device support:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.hotspotoffice.usbtest3"
android:versionCode="1"
android:versionName="1.0" >
<uses-feature android:name="android.hardware.usb.host" />
<uses-sdk
android:minSdkVersion="15"
android:targetSdkVersion="15" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.hotspotoffice.usbtest3.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
</intent-filter>
<meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
android:resource="@xml/device_filter" />
</activity>
</application>
</manifest>
最后，您将需要一个设备过滤器.该文件位于\ res \ xml \ device_filter.xml下请注意，我必须自己在\ res下创建xml文件夹.
Finally, you will need a device filter. This is located under \res\xml\device_filter.xml Note that I had to create the xml folder myself, under \res.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<usb-device vendor-id="7635" product-id="1" class="255" subclass="255" protocol="0" />
</resources>
请注意，所有字段都必须为十进制，而不是十六进制.您需要从自己的设备中替换自己的供应商，产品，类和子类的值.您可以使用"USB主机视图"或"USB设备信息"之类的程序来发现这些值.(从Play商店免费下载.)
Note that all the fields need to be in decimal, not hex. You'll need to substitute your own vendor, product, class and subclass values from your own device. You can use a program like "USB Host View" or "USB Device Info" to discover these values. (download them free from the Play Store.)
最后，这是我在Activity_Main.xml中定义用户界面的方式
您至少需要发现"按钮和TextMultiline才能输出.(忽略初始化"和开/关"按钮.)
Finally, here's how I defined the user interface in Activity_Main.xml
You'll need at least the Discover button, and the TextMultiline for output. (Ignore the Init and On/Off buttons.)
顺便说一句，我使用的是10英寸的Toshiba Thrive平板电脑，所以是YMMV.
BTW, I'm using a 10" Toshiba Thrive tablet, so YMMV.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<EditText
android:id="@+id/txtInfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/btnDiscover"
android:layout_alignRight="@+id/textView1"
android:layout_centerVertical="true"
android:ems="10"
android:inputType="textMultiLine"
android:maxLines="50"
android:minLines="20"
android:minWidth="400dp" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/btnToggleDIO"
android:layout_marginLeft="192dp"
android:layout_toRightOf="@+id/btnDiscover"
android:text="@string/lblDIO"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
android:id="@+id/btnDiscover"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnInit"
android:layout_alignBottom="@+id/btnInit"
android:layout_alignParentLeft="true"
android:layout_marginLeft="73dp"
android:text="@string/strDiscover" />
<ToggleButton
android:id="@+id/btnToggleDIO"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnInit"
android:layout_alignBottom="@+id/btnInit"
android:layout_alignLeft="@+id/textView1"
android:text="@string/strIOState" />
<Button
android:id="@+id/btnInit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/txtInfo"
android:layout_marginBottom="29dp"
android:layout_marginLeft="48dp"
android:layout_toRightOf="@+id/btnDiscover"
android:text="@string/strInit" />
</RelativeLayout>
当我运行程序并插入设备时，它会征得我的连接许可，然后我说确定".然后单击发现"，它告诉我制造商是"Dajac Inc.".产品为"EIO1000"，序列号为"0000004B".
When I run my program and plug in my device, it asks for my permission to connect and I say "Ok". then I click Discover, and it tells me among other things that the manufacturer is "Dajac Inc." the product is "EIO1000" and the serial# is "0000004B".
我希望你能提供良好的照顾；您可以给我功劳，但这只能靠站在他人的肩膀上(我自己很费力)，我已经可以看到很远了.传递下去！-大卫
I wish you good providence; you can give me credit but it's only by standing on the shoulders of others (with a lot of my own sweat) I've been able to see this far. Pass it forward! -David
这篇关于Android中的USB接口的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
