自定义广播

mSDStateBrocast = new SDStateBrocast();
        IntentFilter intentFilter2 = new IntentFilter();
        intentFilter2.addAction(Intent.ACTION_MEDIA_MOUNTED);
        intentFilter2.addAction(Intent.ACTION_MEDIA_UNMOUNTED);    
        intentFilter2.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED); 
        intentFilter2.addAction(Intent.ACTION_MEDIA_EJECT);    
        intentFilter2.addDataScheme("file"); 
        registerReceiver(mSDStateBrocast, intentFilter2);

class  SDStateBrocast extends BroadcastReceiver
    {

        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
             String action = intent.getAction(); 
             
            if (action.equals(Intent.ACTION_MEDIA_MOUNTED))
              {
            //      Log.i(TAG, "===================>Intent.ACTION_MEDIA_MOUNTED");        
                  mIsSdExist = true;
              }else if (action.equals(Intent.ACTION_MEDIA_UNMOUNTED))
              {
            //      Log.i(TAG, "===================>Intent.ACTION_MEDIA_UNMOUNTED");
                  mIsSdExist = false;
                 
              }else if (Intent.ACTION_MEDIA_SCANNER_FINISHED.equals(action))
              {
                //  Log.i(TAG, "===================>Intent.ACTION_MEDIA_SCANNER_FINISHED    mIsSdExist = " + mIsSdExist);
                  if (mIsSdExist)
                  {
                      m_MusicFileList = getMusicFileList();
                      mServiceManager.refreshMusicList(m_MusicFileList);
                      if (m_MusicFileList.size() > 0)
                      {    
                        mIsHaveData = true;
                      }
                      mListViewAdapter.refreshAdapter(m_MusicFileList);
                  }
                  
              }else if (Intent.ACTION_MEDIA_EJECT.equals(action))
              {
                 // Log.i(TAG, "===================>Intent.ACTION_MEDIA_EJECT");
                //  mServiceManager.reset();
                  m_MusicFileList.clear();
                  mListViewAdapter.refreshAdapter(m_MusicFileList);
                  mIsHaveData = false;
                  mUIManager.emptyPlayInfo();
              }
            
        }
        
    }