android U盤檢測及獲取內存信息

在網上查了一些資料。U盤檢測的方法一般有兩種方式，檢測電池或者查看配置信息。

1.Batterymanager檢測方法如下：

[java]
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)); 
     } 
    }       
 }; 

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)得到的值分別為：

0)：斷開

1)：連上USB

2)：連上了充電器

2檢測listroot是否有文件路徑多出

[java]
public class testU implements Runnable{ 
   private File[] roots=File.listRoots(); 
   public testU() { 
    } 
    
   public void run() { 
       System.out.println("檢測系統開啟..."); 
       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("插入盤符:"+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("退出盤符:"+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(); 
    } 
} 

public class testU implements Runnable{
   private File[] roots=File.listRoots();
   public testU() {
    }
  
   public void run() {
       System.out.println("檢測系統開啟...");
       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("插入盤符:"+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("退出盤符:"+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();
    }
}

檢測u盤插入後，獲取u盤總內存及可利用內存可以采用statFs獲取。類似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;