如何清除按鈕的顏色，當我點擊下一步按鈕？

Question

 public class TrueFalseActivity extends Activity implements View.OnClickListener{ 
     Button buttonClicked = null; 
     List<QuestionTrueFalse> questionTrueFalseList; 
     int myscore = 0; 
     int quid=0; 
     int id ; 
     TextView tv, tv1; 
     QuestionTrueFalse curQues; 
     Button b1, b2; 
     Button next, back; 
     Button button; 

     QuestionTrueFalse cur; 

     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_trfal); 
      tv=(TextView) findViewById(R.id.tv1); 
      b1=(Button) findViewById(R.id.b1); 
      b2=(Button) findViewById(R.id.b2); 

      b1.setOnClickListener(this); 
      b2.setOnClickListener(this); 
      DbHelper db = new DbHelper(this); 

      questionTrueFalseList = db.getAllTrFalsQuestions(); 
      if (questionTrueFalseList != null && questionTrueFalseList.size() != 0) { 
       curQues = questionTrueFalseList.get(quid); 
       try { 
        setQuestionView(); 
       }catch (NullPointerException e) 
       { 
        Toast.makeText(getApplicationContext(),"Exception caught",Toast.LENGTH_LONG).show(); 
       } 
      } 
    next=(Button) findViewById(R.id.forw); 
      back=(Button) findViewById(R.id.back); 
      next.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        button=(Button) v; 

        String buttonText=button.getText().toString(); 



        if(curQues.getAnsw().equals(buttonText)) 
        { 
         myscore++; 
        } 
        cur=curQues; 

        if(quid<19){ 
         quid++; 
         curQues=questionTrueFalseList.get(quid); 


         setQuestionView(); 

        }else{ 

         Intent intent = new Intent(TrueFalseActivity.this, ResultActivity.class); 
         Bundle b = new Bundle(); 
         b.putInt("score", myscore); //Your score 
         intent.putExtras(b); //Put your score to your next Intent 
         startActivity(intent); 
         finish(); 
        } 
       } 
      }); 
    back.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        if (quid > 0) { 
         quid--; 
         curQues = questionTrueFalseList.get(quid); 
         setQuestionView(); 
        } 
       } 
      }); 
    private void setQuestionView() { 
      tv.setText(curQues.getQues()); 
      b1.setText(curQues.getOpt1()); 
      b2.setText(curQues.getOpt2()); 
       } 
    public void onClick(View v) { 
      // final Button button; 

      button=(Button) v; 
       String buttonText=button.getText().toString(); 
    enter code here 
//Button is set red if answer is correct.. 
      if (curQues.getAnsw().equals(buttonText)) 
      { 
       button.setBackgroundColor(Color.GREEN); 

        myscore++; 


      } 
    //Button will be set to red if answer is false 
      else 
      { 
       button.setBackgroundColor(Color.RED); 

      } 
      if(quid>19){ 
         countDownTimer.cancel(); 
         timerHasStarted = false; 
       Intent intent = new Intent(TrueFalseActivity.this, ResultActivity.class); 
       Bundle b = new Bundle(); 
       b.putInt("score", myscore); //Your score 
       intent.putExtras(b); //Put your score to your next Intent 
       startActivity(intent); 
       finish(); 
      } 
    } 
    } 

我正在開發測驗應用程序，它有兩個按鈕，一個onClick（）。我點擊了一個按鈕，然後點擊下一個相同的顏色被轉到下一個按鈕。當我點擊下一個按鈕時， 如何清除按鈕顏色。 我應該如何清除進行下一個問題的顏色？我是android新手。任何人都可以幫助我解決這個問題。提前致謝。

Answer 1

在onClickListener爲您的下一個按鈕，您需要重置按鈕的顏色;

這樣的：

next.setOnClickListener(new View.OnClickListener() { 
    @Override 
    public void onClick(View v) { 
     b1.setBackgroundResource(android.R.drawable.btn_default); 
     b2.setBackgroundResource(android.R.drawable.btn_default); 
    } 
});