android U盘检测及获取内存储器信息

在网上查了一些资料。U盘检测的方法一般有两种方式，检测电池或者查看配置信息。

1.Batterymanager检测方法如下：

IntentFilter mIntentFilter = new IntentFilter(); mIntentFilter.addAction(Intent.ACTION_BATTERY_CHANGED); registerReceiver(BtStatusReceiver, mIntentFilter); public BroadcastReceiver BtStatusReceiver = new BroadcastReceiver() // receive broadcast that BT Adapter status change {    @Override    public void onReceive(Context context, Intent intent)    {     String action = intent.getAction();     if (action.equals(Intent.ACTION_BATTERY_CHANGED))     {             Log.d("Battery", "" + intent.getIntExtra("plugged", 0));      Toast text=Toast.makeText(context, "ACTION_USB_DEVICE_ATTACHED"+intent.getIntExtra("plugged", 0), Toast.LENGTH_LONG);         text.show();         dataview.setText(""+intent.getIntExtra("plugged", 0));     }    }       };

intent.getIntExtra("plugged", 0)得到的值分别为：

0)：断开

1)：连上USB

2)：连上了充电器

2检测listroot是否有文件路径多出

public class testU implements Runnable{   private File[] roots=File.listRoots();   public testU() {    }      public void run() {       System.out.println("检测系统开启...");       while (true) {           File[] tempFile = File.listRoots();           boolean sign = false;           if (tempFile.length > roots.length) {                for (int i = tempFile.length -1; i >= 0; i--) {                    sign = false;                    for(int j = roots.length -1; j >= 0; j--) {                        if(tempFile[i].equals(roots[j])) {                            sign = true;                        }                    }                    if (sign == false) {                       System.out.println("插入盘符:"+tempFile[i].toString());                    }                }                roots=File.listRoots();//更新roots           } else {                for (int i = roots.length - 1;i >= 0; i--) {                    sign = false;                    for(int j = tempFile.length- 1; j >= 0; j--) {                        if(tempFile[j].equals(roots[i])) {                            sign = true;                        }                    }                    if (sign == false) {                       System.out.println("退出盘符:"+roots[i].toString());                    }                }                roots=File.listRoots();//更新roots           }           try {                Thread.sleep(1000);           } catch (InterruptedException ex) {               Logger.getLogger(testU.class.getName()).log(Level.SEVERE, null, ex);           }       }    }    public static void main(String args[]) {       new Thread(new testU()).start();    }}

检测u盘插入后，获取u盘总内存及可利用内存可以采用statFs获取。类似SD卡。

final StatFs stat =new StatFs(Udisk.getPath());

final long blockSize = stat.getBlockSize();

final long totalBlocks = stat.getBlockCount();

final long availableBlocks = stat.getAvailableBlocks();

       long mTotalSize = totalBlocks * blockSize;

       long mAvailSize =availableBlocks * blockSize;

3.通过读取配置文件检测U盘

File Usbfile = new File("/proc/partitions");                if(Usbfile.exists()){                	 try {                     	FileReader  file= new FileReader("/proc/partitions");                         BufferedReader br=new BufferedReader(file);                         String strLine="";                         while((strLine=br.readLine())!=null)                        {                             if(strLine.indexOf("sd")>0)                            {                            	 searchFile("usb",Ufile);                                 System.out.println("Udisk insert---------------------------------->");                                 Log.d("Udisk","Udisk insert---------->");                                 break;                             }                         }                         br.close();                         file.close();                     } catch (Exception e) {                         // TODO Auto-generated catch block                         e.printStackTrace();                     }