public class MyService extends Service {

    private static final String TAG = "MyService";

    File imagepath;

    @Override

    public IBinder onBind(Intent intent) {

        return null;

    }

    @Override

    public void onCreate() {

        super.onCreate();

        Log.i(TAG, "服务启动...");

        // 在IntentFilter中选择你要监听的行为

        IntentFilter intentFilter = new IntentFilter(Intent.ACTION_MEDIA_MOUNTED);// sd卡被插入，且已经挂载

        intentFilter.setPriority(1000);// 设置最高优先级

        intentFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);// sd卡存在，但还没有挂载

        intentFilter.addAction(Intent.ACTION_MEDIA_REMOVED);// sd卡被移除

        intentFilter.addAction(Intent.ACTION_MEDIA_SHARED);// sd卡作为 USB大容量存储被共享，挂载被解除

        intentFilter.addAction(Intent.ACTION_MEDIA_BAD_REMOVAL);// sd卡已经从sd卡插槽拔出，但是挂载点还没解除

        intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_STARTED);// 开始扫描

        intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);// 扫描完成

        intentFilter.addDataScheme("file");

        registerReceiver(broadcastRec, intentFilter);// 注册监听函数

        Log.i(TAG, "sd状态改变");

    }

    private final BroadcastReceiver broadcastRec = new BroadcastReceiver() {

        @Override

        public void onReceive(Context context, Intent intent) {

            String action = intent.getAction();

            if (action.equals("android.intent.action.MEDIA_MOUNTED"))// SD

            // 卡已经成功挂载

            {

                imagepath = android.os.Environment.getExternalStorageDirectory();// 你的SD卡路径

                Toast.makeText(MyService.this, "我的卡已经成功挂载", 0).show();

            } else if (action.equals("android.intent.action.MEDIA_REMOVED")// 各种未挂载状态

                    || action.equals("android.intent.action.ACTION_MEDIA_UNMOUNTED")

                    || action.equals("android.intent.action.ACTION_MEDIA_BAD_REMOVAL")) {

                imagepath = android.os.Environment.getDataDirectory();// 你的本地路径

                Toast.makeText(MyService.this, "我的各种未挂载状态", 0).show();

            }else if (action.equals(Intent.ACTION_MEDIA_SCANNER_STARTED)){//开始扫描

                Toast.makeText(MyService.this, "开始扫描...", 0).show();

            }else if (action.equals(Intent.ACTION_MEDIA_SCANNER_FINISHED)){//扫描完成

                Toast.makeText(MyService.this, "扫描完成...", 0).show();

            }else if (action.equals(Intent.ACTION_MEDIA_SHARED)){//扩展介质的挂载被解除 (unmount)。因为它已经作为 USB 大容量存储被共享

                Toast.makeText(MyService.this, " USB 大容量存储被共享...", 0).show();

            }else {

                Toast.makeText(MyService.this, "其他状态...", 0).show();

            }

            Log.i(TAG, "imagepath---" + imagepath);

        }

    };

    public void onDestroy() {

        unregisterReceiver(broadcastRec);//取消注册

    };

}

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="cn.ls"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />

    <!-- 在SDCard中创建与删除文件权限 -->

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

    <!-- 往SDCard写入数据权限 -->

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

    <application

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name" >

        <activity

            android:name=".Android_sdcActivity"

            android:label="@string/app_name" >

            <intent-filter>

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

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

         <!-- 注册服务 -->

        <service android:name=".service.MyService">

            <intent-filter>

                <action android:name="cn.ls.service.myservice.action" />

                <category android:name="android.intent.category.DEFAULT" />

            </intent-filter>

        </service>

        <!-- 在SDCard中创建与删除文件权限 -->

    </application>

</manifest>