android U盘检测及获取内存信息

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();
                     }

4.通过广播检测

<action android:name="android.intent.action.MEDIA_MOUNTED" />
                <action android:name="android.intent.action.MEDIA_EJECT" />