实例介绍
【实例简介】源码在压缩包中,解压几次就能看到,android usb 通讯例子
【实例截图】
【实例截图】
【核心代码】
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; } }
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