android 监听 USB 拔插广播消息

1、定义广播类：

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
  
  public class USBBroadcastReceiver extends BroadcastReceiver{
      @Override
     public void onReceive(Context context, Intent intent) {
         // TODO Auto-generated method stub
         if(intent.getAction().equals("android.hardware.usb.action.USB_STATE")){
              if (intent.getExtras().getBoolean("connected")){
                 // usb 插入
                  Toast.makeText(context, "插入", Toast.LENGTH_LONG).show();
               }else{
                //   usb 拔出
                   Toast.makeText(context, "拔出", Toast.LENGTH_LONG).show();
               }
         }
     }
 }

2、在AndroidManifest.xml中注册广播：

<receiver android:name=".USBBroadcastReceiver">  
    <intent-filter android:priority="800">  
        <action android:name="android.hardware.usb.action.USB_STATE"/>
     </intent-filter>  
 </receiver>