SD卡状态监听(无序广播)

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>