爱站程序员基地广播的action
主要用UsbManager.ACTION_USB_DEVICE_ATTACHED和UsbManager.ACTION_USB_DEVICE_DETACHED来判断
public class USBBroadcastReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();switch (action) {case UsbManager.ACTION_USB_DEVICE_ATTACHED://接收到U盘设备插入广播UsbDevice device_add = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);if (device_add != null) {EventBusUtil.sendEvent(new MessageEvent(1));}break;case UsbManager.ACTION_USB_DEVICE_DETACHED://接收到U盘设设备拔出广播//Toast.makeText(context, \"拔出\", Toast.LENGTH_LONG).show();EventBusUtil.sendEvent(new MessageEvent(0));break;}}}
然后再具体的页面注册广播
IntentFilter usbDeviceStateFilter = new IntentFilter();usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);baseActivity.registerReceiver(usbBroadcastReceiver, usbDeviceStateFilter);
数据读取用到github上开源的一个库
implementation ‘com.github.mjdev:libaums:0.5.5’
//获取到OTG连接的U盘public FileSystem otgGet() {UsbMassStorageDevice[] devices = UsbMassStorageDevice.getMassStorageDevices(baseActivity);FileSystem currentFs = null;for (UsbMassStorageDevice device : devices) {//一般只有一个OTG借口，所以这里只取第一个try {device.init();//如果设备不支持一些格式的U盘，这里会有异常if (device == null || device.getPartitions() == null ||device.getPartitions().get(0) == null ||device.getPartitions().get(0).getFileSystem() == null) {return null;}currentFs = device.getPartitions().get(0).getFileSystem();cFolder = currentFs.getRootDirectory();readFromUDisk();} catch (Exception e) {return null;}}return currentFs;}private void readFromUDisk() {usbFiles = new UsbFile[0];try {usbFiles = cFolder.listFiles();xmlName = cFolder.list();} catch (IOException e) {e.printStackTrace();}if (null != usbFiles && usbFiles.length > 0) {handle.sendEmptyMessage(0);}}
