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   源码介绍

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源码在压缩包中，解压几次就能看到，android usb 通讯例子

package com.example.usbprinter;

import java.io.IOException;
import java.io.InputStream;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.AssetManager;
import android.hardware.usb.UsbConstants;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbInterface;
import android.hardware.usb.UsbManager;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends Activity {
	private UsbManager mManager;
	private UsbDevice mDevice;
	private UsbDeviceConnection mDeviceConnection;
	private UsbInterface mInterface;
	private PrinterDevice mPrinterDevice;
	private static String LOG_TAG = "UsbPrinter";
	
	AssetManager mAssetManager = null;
	InputStream mInputStream = null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		//读取资源文件
		mAssetManager = getAssets();
		try {
			mInputStream = mAssetManager.open("HelloWorld.PCL3GUI");
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		mManager = (UsbManager) getSystemService(Context.USB_SERVICE);
		for(UsbDevice device : mManager.getDeviceList().values()) {
			UsbInterface intf = findPrinterInterface(device);
			if (setPrinterInterface(device, intf)) {
				break;
			}
		}
		
		// listen for new devices
		IntentFilter filter = new IntentFilter();
		filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
		filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
		registerReceiver(mUsbReceiver, filter);
	}
	
	BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
		public void onReceive(Context context, Intent intent) {
			String action = intent.getAction();

			if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
				UsbDevice device = (UsbDevice) intent
						.getParcelableExtra(UsbManager.EXTRA_DEVICE);
				UsbInterface intf = findPrinterInterface(device);
				if (intf != null) {
					Log.i(LOG_TAG, "Found Printer interface "   intf);
					setPrinterInterface(device, intf);
				}
			} else if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
				UsbDevice device = intent
						.getParcelableExtra(UsbManager.EXTRA_DEVICE);
				String deviceName = device.getDeviceName();
				if (mDevice != null && mDevice.equals(deviceName)) {
					Log.i(LOG_TAG, "printer interface removed");
					setPrinterInterface(null, null);
				}
			}
		}
	};
	
	// searches for an adb interface on the given USB device
	static private UsbInterface findPrinterInterface(UsbDevice device) {
		Log.d(LOG_TAG, "findPrinterInterface "   device);
		int count = device.getInterfaceCount();
		for (int i = 0; i < count; i  ) {
			UsbInterface intf = device.getInterface(i);
			if (intf.getInterfaceClass() == UsbConstants.USB_CLASS_PRINTER) {
				Log.i(LOG_TAG, "Printer");
				return intf;
			}
		}
		return null;
	}
	

	// Sets the current USB device and interface
	private boolean setPrinterInterface(UsbDevice device, UsbInterface intf) {
		if (mDeviceConnection != null) {
			if (mInterface != null) {
				mDeviceConnection.releaseInterface(mInterface);
				mInterface = null;
			}
			mDeviceConnection.close();
			mDevice = null;
			mDeviceConnection = null;
		}

		if (device != null && intf != null) {
			UsbDeviceConnection connection = mManager.openDevice(device);
			if (connection != null) {
				Log.i(LOG_TAG, "open succeeded");
				if (connection.claimInterface(intf, false)) {
					Log.i(LOG_TAG, "claim interface succeeded");
					mDevice = device;
					mDeviceConnection = connection;
					mInterface = intf;
					mPrinterDevice = new PrinterDevice(this, mDeviceConnection, intf);
					Log.i(LOG_TAG, "call start");
					mPrinterDevice.start();
					return true;
				} else {
					Log.i(LOG_TAG, "claim interface failed");
					connection.close();
				}
			} else {
				Log.i(LOG_TAG, "open failed");
			}
		}

		if (mDeviceConnection == null && mPrinterDevice != null) {
			//mPrinterDevice.stop();
			mPrinterDevice = null;
		}
		return false;
	}
}