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：

[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

[java]
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 (InterruptedExceptio

补充：移动开发 , Android ,