androidU盘检测

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，检测配置文件
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();
                     }
                }  
然后获取usb路径
//获usb文件路径
    private void searchFile(String keyword,File filepath) 
    {
    System.out.println("searchFile start...");
    File[] files = filepath.listFiles();     
            if (files.length > 0) 
            { 
                    for (File file : files) 
                    { 
                     if (file.isDirectory()) 
                     { 
                      //如果目录可读就执行（一定要加，不然会挂掉） 
                      if(file.canRead()){ 
                       searchFile(keyword,file);  //如果是目录，递归查找 
                      } 
        } 
                     else {   
                       //判断是文件，则进行文件名判断
                    //System.out.println("*******************"+file.getName().indexOf(keyword));
                                try {    
                                 if (file.getName().indexOf(keyword) > -1||file.getName().indexOf(keyword.toUpperCase()) > -1)  
                                 {
                                System.out.println("Udisk find:------------------------------>");
                                System.out.println(file.getPath());
                                System.out.println(file.getName());
                                Log.d("Udisk",file.getName());
                                 }    
                               } catch(Exception e) {    
                                        Toast.makeText(this,"find error", Toast.LENGTH_SHORT).show();    
                                }    
                       } 
                    } 
         }  
    }