Android-USB-OTG外部设备通讯USB插拔检测

【核心代码】

package com.example.usbDetection;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbManager;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		IntentFilter usbDeviceStateFilter = new IntentFilter();
		usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
		usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
		registerReceiver(mUsbReceiver, usbDeviceStateFilter);
	}
	@Override
	protected void onDestroy() {
		super.onDestroy();
		unregisterReceiver(mUsbReceiver);
	};
	BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			String action = intent.getAction();
			if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) 
			{
				UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
				if (device != null) {
					Toast.makeText(MainActivity.this, "有设备拔出", Toast.LENGTH_SHORT).show();
				}
			}
			else if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
					Toast.makeText(MainActivity.this, "有设备插入", Toast.LENGTH_SHORT).show();
					
			}
		}
	};

}