Method for android to read U disk through usb

In this article, we share the specific code of android reading U disk through usb for your reference. The specific contents are as follows

1. Associate compile 'com. github. mjdev: libaums: +'

2. Permission setting

<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" />

3. Monitor the broadcast of u disk insertion and unplugging

 // Eavesdropping otg Insert   Pull out 
 IntentFilter usbDeviceStateFilter = new IntentFilter();
 usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
 usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
 mContext.registerReceiver(UDiskMountedReceiver, usbDeviceStateFilter);
 // Register to listen for custom broadcasts 
 IntentFilter filter = new IntentFilter(Constant.ACTION_USB_PERMISSION);
 mContext.registerReceiver(UDiskMountedReceiver, filter);

4. Code

package com.zb.usbtest;

/**
 * @ Project name:  UsbTest 
 * @ Package name:  com.zb.usbtest
 * @ Filename : ReadUDisk
 * @ Founder : 25934
 * @ Creation time : 2018-07-24 13:50
 * @ Description:  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);
 }

 /**
  *  Accept U Disk insertion and pull-out events 
  * @param onUDiskCallBack
  */
 public void setOnUDiskCallBack(UDiskCallBack.OnUDiskCallBack onUDiskCallBack) {
  if (mOnUDiskCallBack == null) {
   registerReceiver();
   mOnUDiskCallBack = onUDiskCallBack;
  }
 }

 /**
  *  Registered broadcast recipient 
  */
 public void registerReceiver() {
  // Eavesdropping otg Insert   Pull out 
  IntentFilter usbDeviceStateFilter = new IntentFilter();
  usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
  usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
  mContext.registerReceiver(UDiskMountedReceiver, usbDeviceStateFilter);
  // Register to listen for custom broadcasts 
  IntentFilter filter = new IntentFilter(Constant.ACTION_USB_PERMISSION);
  mContext.registerReceiver(UDiskMountedReceiver, filter);
  Log.e("ReadUDisk", "registerReceiver: ");
 }

 /**
  *  Log off the broadcast receiver 
  */
 public void unReisterReceiver() {
  if (UDiskMountedReceiver != null) {
   mContext.unregisterReceiver(UDiskMountedReceiver);
  }
 }

 /**
  *  Check usb Permissions for the device 
  * @param device
  * @return
  */
 public boolean checkPerssion(UsbMassStorageDevice device) {
  if (mUsbManager==null){
   return false;
  }
  if (mUsbManager.hasPermission(device.getUsbDevice())) {// If there is, read directly whether the device has permission 
   return true;
  } else {
   return false;
  }
 }


 /**
  *  Read the current usb Quantity of equipment 
  * @return
  */
 public int getDeviceCount() {
  // Acquisition of storage devices 
  UsbMassStorageDevice[] storageDevices =UsbMassStorageDevice.getMassStorageDevices(mContext);
  return storageDevices.length;
 }

 /**
  *  According to position Get usb Equipment 
  * @param position
  * @return
  */
 public UsbMassStorageDevice getUsbMassDevice(int position) {
  // Acquisition of storage devices 
  UsbMassStorageDevice[] storageDevices =UsbMassStorageDevice.getMassStorageDevices(mContext);
  if (position > storageDevices.length) {
   return null;
  } else {
   return storageDevices[position];
  }
 }

 /**
  *  Get usb All storage devices on the 
  * @return
  */
 public UsbMassStorageDevice[] getUsbMassAllDevice() {
  // Acquisition of storage devices 
  UsbMassStorageDevice[] storageDevices =UsbMassStorageDevice.getMassStorageDevices(mContext);
  return storageDevices;
 }

 /**
  *  Get the path according to the device 
  * @param device
  * @return
  */
 public FileSystem readDevice(UsbMassStorageDevice device) {
  try {
   if (!checkPerssion(device)){ // Check whether you have permission 
    return null;
   }

   device.init();// Before using the device, you need to   Initialization 
   Partition partition = device.getPartitions().get(0); // Use only the section of the device 1 Partitions 
   FileSystem currentFs = partition.getFileSystem();
   // currentFs.getCapacity(); // Capacity size 
   // currentFs.getOccupiedSpace(); // Size Used 
   // currentFs.getFreeSpace(); // Unused size 
   UsbFile root  = currentFs.getRootDirectory();// Get the root directory 
   String deviceName = currentFs.getVolumeLabel();// Get the device label 
   return currentFs;
  } catch (Exception e) {
   e.printStackTrace();
   return null;
  }
 }

 /**
  *  Get U File and folder path of disk 
  * @param fileSystem
  * @return
  */
 public List<UsbFile> getUsbFiles(FileSystem fileSystem) {
  usbFiles.clear();
  try {
   for (UsbFile file : fileSystem.getRootDirectory()
           .listFiles()) { // Add all file and folder paths to the usbFiles Array 
    usbFiles.add(file);
   }
   Collections.sort(usbFiles, new Comparator<UsbFile>() {// Simple sort   Folder in front   The file is in the back 
    @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: // Custom permission broadcast 
     if (mOnUDiskCallBack != null) {
      mOnUDiskCallBack.onPermissionCallBack();
     }
     break;
    case UsbManager.ACTION_USB_DEVICE_ATTACHED: //usb Device insertion broadcast 
     if (mOnUDiskCallBack != null) {
      mOnUDiskCallBack.onAttachDeviceCallBack();
     }
     break;

    case UsbManager.ACTION_USB_DEVICE_DETACHED: //usb Equipment pull-out broadcast 
     if (mOnUDiskCallBack != null) {
      mOnUDiskCallBack.onDetachDeviceCallBack();
     }
     break;
   }
  }
 };
}