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为什么这里无法识别R文件里的东西，但R文件里有啊，求老师指教

    if(mCurState!=state){
           mCurState=state;
           switch(state){
           case STATE_NORMAL:
               setBackgroundResource(R.drawable.button_record_normal);
               setText(R.string.str_recorder_normal);
               break;

           case STATE_RECORDING:
               setBackgroundResource(R.drawable.button_record_normal);
               setText(R.string.str_recorder_recording);
               if(isRecording){

                   mDialogManager.recording();


               }

               break;
           case STATE_WANT_TO_CANCEL:
               setBackgroundResource(R.drawable.button_record_normal);
               setText(R.string.str_recorder_want_cancel);
               mDialogManager.wantToCancel();
               break;