如何监听USB插拔

方式一:

//实例化IntentFilter对象IntentFilter fiter= new IntentFilter();filter.addAction("android.hardware.usb.action.USB_STATE");
mUsbReceiver = new USBReceiver();//自己注册的广播接收者
//注册广播接收者registerReceiver(mUsbReceiver ,filter);
  备注:
但是USBManager不可以点出来直接调用只能用他的String "android.hardware.usb.action.USB_STATE";
测试发现这个action生效，但不是即时生效的，因为这个action其实是监听USB是否connected，当USB connected时才会生效，有时候你插入了USB,但没connected，这个广播不会发出 .这个时候可以格式化刷机一下,我之前用这个就没有反应,后来格式化刷机了,问题得到了解决!

方式二:
IntentFilter filter = new IntentFilter();  filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);  filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);  registerReceiver(mUsbReceiver, filter);  
方式三: 
    
有没有一种即插就生效的呢
查看系统源码
监听USB的广播使用的是电池电量变化Action
   Intent.ACTION_BATTERY_CHANGE  





当使用这个action时即插就生效，并会持续监听
还有一种是是否是USB充电，只能是判断一下
   int chargePlug = arg1.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);  
boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;


private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {  24.        @Override  25.        public void onReceive(Context context, Intent intent) {  26.            String action = intent.getAction();  27.            UsbDevice usbDevice = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);  28.            String deviceName = usbDevice.getDeviceName();  29.            Log.e(TAG,"--- 接收到广播， action: " + action);  30.            if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {  31.                Log.e(TAG, "USB device is Attached: " + deviceName);  32.            } else if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {  33.                Log.e(TAG, "USB device is Detached: " + deviceName);  34.            }  35.        }  36.    };  37.      38.    protected void onStop() {  39.        super.onStop();  40.        unregisterReceiver(mUsbReceiver);  41.    };  42.}