android通过usb读取U盘的方法

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<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.hardware.usb.host" android:required="false" /> 
<uses-feature android:name="android.hardware.usb.host" android:required="true" />

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//监听otg插入 拔出
 IntentFilter usbDeviceStateFilter = new IntentFilter();
 usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
 usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
 mContext.registerReceiver(UDiskMountedReceiver, usbDeviceStateFilter);
 //注册监听自定义广播
 IntentFilter filter = new IntentFilter(Constant.ACTION_USB_PERMISSION);
 mContext.registerReceiver(UDiskMountedReceiver, filter);

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package com.zb.usbtest;

/**
 * @项目名： UsbTest 
 * @包名： com.zb.usbtest
 * @文件名: ReadUDisk
 * @创建者: 25934
 * @创建时间: 2018-07-24 13:50
 * @描述： TODO
 */

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbManager;
import android.util.Log;
import com.github.mjdev.libaums.UsbMassStorageDevice;
import com.github.mjdev.libaums.fs.FileSystem;
import com.github.mjdev.libaums.fs.UsbFile;
import com.github.mjdev.libaums.partition.Partition;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import static com.zb.usbtest.Constant.ACTION_USB_PERMISSION;

public class ReadUDisk {
 private UDiskCallBack.OnUDiskCallBack mOnUDiskCallBack = null;
 private Context    mContext;
 private UsbMassStorageDevice[] storageDevices;
 private List<UsbFile> usbFiles = new ArrayList<>();
 private final UsbManager mUsbManager;

 public ReadUDisk(Context context) {
  mContext = context;
  mUsbManager = (UsbManager) mContext.getSystemService(Context.USB_SERVICE);
 }

 /**
  * 接受U盘插入和拔出事件
  * @param onUDiskCallBack
  */
 public void setOnUDiskCallBack(UDiskCallBack.OnUDiskCallBack onUDiskCallBack) {
  if (mOnUDiskCallBack == null) {
   registerReceiver();
   mOnUDiskCallBack = onUDiskCallBack;
  }
 }

 /**
  * 注册广播接收者
  */
 public void registerReceiver() {
  //监听otg插入 拔出
  IntentFilter usbDeviceStateFilter = new IntentFilter();
  usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
  usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
  mContext.registerReceiver(UDiskMountedReceiver, usbDeviceStateFilter);
  //注册监听自定义广播
  IntentFilter filter = new IntentFilter(Constant.ACTION_USB_PERMISSION);
  mContext.registerReceiver(UDiskMountedReceiver, filter);
  Log.e("ReadUDisk", "registerReceiver: ");
 }

 /**
  * 注销广播接收者
  */
 public void unReisterReceiver() {
  if (UDiskMountedReceiver != null) {
   mContext.unregisterReceiver(UDiskMountedReceiver);
  }
 }

 /**
  * 检查usb设备的权限
  * @param device
  * @return
  */
 public boolean checkPerssion(UsbMassStorageDevice device) {
  if (mUsbManager==null){
   return false;
  }
  if (mUsbManager.hasPermission(device.getUsbDevice())) {//有就直接读取设备是否有权限
   return true;
  } else {
   return false;
  }
 }


 /**
  * 读取当前usb设备的数量
  * @return
  */
 public int getDeviceCount() {
  //获取存储设备
  UsbMassStorageDevice[] storageDevices =UsbMassStorageDevice.getMassStorageDevices(mContext);
  return storageDevices.length;
 }

 /**
  * 根据position获取usb设备
  * @param position
  * @return
  */
 public UsbMassStorageDevice getUsbMassDevice(int position) {
  //获取存储设备
  UsbMassStorageDevice[] storageDevices =UsbMassStorageDevice.getMassStorageDevices(mContext);
  if (position > storageDevices.length) {
   return null;
  } else {
   return storageDevices[position];
  }
 }

 /**
  * 获取usb上所有的存储设备
  * @return
  */
 public UsbMassStorageDevice[] getUsbMassAllDevice() {
  //获取存储设备
  UsbMassStorageDevice[] storageDevices =UsbMassStorageDevice.getMassStorageDevices(mContext);
  return storageDevices;
 }

 /**
  * 根据设备获取路径
  * @param device
  * @return
  */
 public FileSystem readDevice(UsbMassStorageDevice device) {
  try {
   if (!checkPerssion(device)){ //检查是否有权限
    return null;
   }

   device.init();//使用设备之前需要进行 初始化
   Partition partition = device.getPartitions().get(0); //仅使用设备的第一个分区
   FileSystem currentFs = partition.getFileSystem();
   // currentFs.getCapacity(); //容量大小
   // currentFs.getOccupiedSpace(); //已使用大小
   // currentFs.getFreeSpace(); //未使用的大小
   UsbFile root  = currentFs.getRootDirectory();//获取根目录
   String deviceName = currentFs.getVolumeLabel();//获取设备标签
   return currentFs;
  } catch (Exception e) {
   e.printStackTrace();
   return null;
  }
 }

 /**
  * 获取U盘的文件和文件夹路径
  * @param fileSystem
  * @return
  */
 public List<UsbFile> getUsbFiles(FileSystem fileSystem) {
  usbFiles.clear();
  try {
   for (UsbFile file : fileSystem.getRootDirectory()
           .listFiles()) { //将所以文件和文件夹路径添加到usbFiles数组中
    usbFiles.add(file);
   }
   Collections.sort(usbFiles, new Comparator<UsbFile>() {//简单排序 文件夹在前 文件在后
    @Override
    public int compare(UsbFile oFile1, UsbFile oFile2) {
     return oFile1.isDirectory()
       ? -1
       : 1;
    }
   });
  } catch (IOException e) {
   e.printStackTrace();
  }
  return usbFiles;
 }


 private BroadcastReceiver UDiskMountedReceiver = new BroadcastReceiver() {
  @Override
  public void onReceive(Context context, Intent intent) {
   String action = intent.getAction();
   switch (action) {
    case ACTION_USB_PERMISSION: //自定义权限广播
     if (mOnUDiskCallBack != null) {
      mOnUDiskCallBack.onPermissionCallBack();
     }
     break;
    case UsbManager.ACTION_USB_DEVICE_ATTACHED: //usb设备插入广播
     if (mOnUDiskCallBack != null) {
      mOnUDiskCallBack.onAttachDeviceCallBack();
     }
     break;

    case UsbManager.ACTION_USB_DEVICE_DETACHED: //usb设备拔出广播
     if (mOnUDiskCallBack != null) {
      mOnUDiskCallBack.onDetachDeviceCallBack();
     }
     break;
   }
  }
 };
}