Android 扫描SDCard上的音乐文件以及监听扫描事件

public class ScanSdReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
String action = intent.getAction();
if (Intent.ACTION_MEDIA_SCANNER_STARTED.equals(action))
{
//开始扫描，把你的代码放这里
}
else if (Intent.ACTION_MEDIA_SCANNER_FINISHED.equals(action))
{
//扫描结束，把你的代码放这里
}
}
}

IntentFilter intentfilter = new IntentFilter(Intent.ACTION_MEDIA_SCANNER_STARTED);
intentfilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);
intentfilter.addDataScheme("file");
ScanSdReceiver scanSdReceiver = new ScanSdReceiver();
registerReceiver(scanSdReceiver, intentfilter);

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
Uri.parse("file://" + Environment.getExternalStorageDirectory().getAbsolutePath())));