import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

/**

 * 1. 买收音机

 */

public class SDReceiver extends BroadcastReceiver {

   /**

    * 系统调用

    * 接受到广播后调用

    */

   @Override

   public void onReceive(Context context, Intent intent) {

      String action = intent.getAction();

      if ("android.intent.action.MEDIA_UNMOUNTED".equals(action)) {

        System.out.println("SD卡被拔出");

      }else if("android.intent.action.MEDIA_MOUNTED".equals(action)){

         System.out.println("SD卡被插入了");

      }

   }

}

清单文件：

   <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/>

       <!-- 2. 装电池 -->

        <receiver android:name="com.example.sdmonitor.SDReceiver" >

            <!--  3. 调频道-->

            <intent-filter >

                <action android:name="android.intent.action.MEDIA_MOUNTED"/>

                <action android:name="android.intent.action.MEDIA_UNMOUNTED"/>

                <!-- 重要 -->

                <data android:scheme="file"/>

            </intent-filter>

        </receiver>