android通过usb读取U盘的方法

<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" />

 //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);

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;   }  } };}