// 监听类  private final BroadcastReceiver sdcardListener = new BroadcastReceiver() {            @Override          public void onReceive(Context context, Intent intent) {                String action = intent.getAction();              Log.d("TAG", "sdcard action:::::" + action);              if(Intent.ACTION_MEDIA_MOUNTED.equals(action)                      || Intent.ACTION_MEDIA_SCANNER_STARTED.equals(action)                      || Intent.ACTION_MEDIA_SCANNER_FINISHED.equals(action)                      ){                  // SD卡成功挂载                } else if(Intent.ACTION_MEDIA_REMOVED.equals(action)                      || Intent.ACTION_MEDIA_UNMOUNTED.equals(action)                      || Intent.ACTION_MEDIA_BAD_REMOVAL.equals(action)                      ){                  // SD卡挂载失败                }            }      };            // 注册监听      private void registerSDCardListener(){          IntentFilter intentFilter = new IntentFilter(Intent.ACTION_MEDIA_MOUNTED);          intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_STARTED);          intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);          intentFilter.addAction(Intent.ACTION_MEDIA_REMOVED);          intentFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);          intentFilter.addAction(Intent.ACTION_MEDIA_BAD_REMOVAL);          intentFilter.addDataScheme("file");          registerReceiver(sdcardListener, intentFilter);      }