Question

我正在做一个IQtest应用程序。我已经插入一个计时器来计算回答问题的时间。每当测验活动开始时计时器启动。有一个暂停按钮暂停计时器并恢复计时器。计时器正常工作当我按照上述方式进行上述步骤时。但问题是如果计时器正在运行，并且如果我恢复计时器，则计时器从先前暂停的值开始。这是QuizActivity.java

package com.example.iqtest;
public class QuizActivity extends Activity {
List<Question> quesList;
int score,qid,temp;
Question currentQ;
TextView txtQuestion;
RadioButton rda, rdb, rdc,rdd,rde;
Button butNext,agecal;
private Button pause,resume;
private TextView timerValue;
private long startTime = 0L;
private Handler customHandler = new Handler();
long timeInMilliseconds = 0L;
long timeSwapBuff = 0L;
long updatedTime = 0L;


@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_quiz);
    timerValue = (TextView) findViewById(R.id.textView2);
    startTime = SystemClock.uptimeMillis();
    customHandler.postDelayed(updateTimerThread, 0);
    resume = (Button) findViewById(R.id.resume);
     resume.setOnClickListener(new View.OnClickListener() {
         public void onClick(View view) {
     startTime = SystemClock.uptimeMillis();
        customHandler.postDelayed(updateTimerThread, 0);
         }
     });
     pause = (Button) findViewById(R.id.pause);
     pause.setOnClickListener(new View.OnClickListener() {
         public void onClick(View view) {
             timeSwapBuff += timeInMilliseconds;
             customHandler.removeCallbacks(updateTimerThread);
         }
     });

    Bundle b = getIntent().getExtras(); 
    qid=b.getInt("start");
    temp=qid;
    agecal = (Button) findViewById(R.id.buttoncalage);
    agecal.setOnClickListener(new View.OnClickListener()        
    {
        public void onClick(View view) 
        {
            Intent i = new Intent(QuizActivity.this,AgeCalculation.class);
            startActivity(i); 
        }

}); 
    DbHelper db=new DbHelper(this);
    quesList=db.getAllQuestions();
    currentQ=quesList.get(qid);
    txtQuestion=(TextView)findViewById(R.id.textView1);
    rda=(RadioButton)findViewById(R.id.radio0);
    rdb=(RadioButton)findViewById(R.id.radio1);
    rdc=(RadioButton)findViewById(R.id.radio2);
    rdd=(RadioButton)findViewById(R.id.radio3);
    rde=(RadioButton)findViewById(R.id.radio4);
    butNext=(Button)findViewById(R.id.button1);
    setQuestionView();
    butNext.setOnClickListener(new View.OnClickListener() {     
        @Override
        public void onClick(View v) {
            RadioGroup grp=(RadioGroup)findViewById(R.id.radioGroup1);
            RadioButton answer=(RadioButton)findViewById(grp.getCheckedRadioButtonId());
            if(currentQ.getanswer().equals(answer.getText()))
            {
                score++;
            }
            if(qid<(temp+20)){                  
                currentQ=quesList.get(qid);
                setQuestionView();
            }else{
                Intent intent = new Intent(QuizActivity.this, ResultActivity.class);
                Bundle b = new Bundle();
                b.putInt("score", score); //Your score
                intent.putExtras(b); //Put your score to your next Intent
                startActivity(intent);
                finish();
            }
        }
    });
}
private void setQuestionView()
{
    txtQuestion.setText(currentQ.getquestion());
    rda.setText(currentQ.getopta());
    rdb.setText(currentQ.getoptb());
    rdc.setText(currentQ.getoptc());
    rdd.setText(currentQ.getoptd());
    rde.setText(currentQ.getopte());
    qid++;
}
private Runnable updateTimerThread = new Runnable() {
public void run() {
timeInMilliseconds = SystemClock.uptimeMillis() - startTime;
updatedTime = timeSwapBuff + timeInMilliseconds;
int secs = (int) (updatedTime / 1000);
int mins = secs / 60;
secs = secs % 60;
int milliseconds = (int) (updatedTime % 1000);
timerValue.setText("" + mins + ":" + String.format("%02d", secs) + ":"+ String.format("%03d", milliseconds));customHandler.postDelayed(this, 0);
}
};

}

Answer 1

最优雅的解决方案是隐藏不允许用户按下的按钮。在resume的onClickListener中，添加以下行：

resume.setVisibility(View.GONE); // or View.INVISIBLE depending on what you want to do
pause.setVisibility(View.VISIBLE);

在pause的onClickListener中，添加以下行：

resume.setVisibility(View.VISIBLE);
pause.setVisibility(View.GONE);

此外，在您的布局中，默认情况下应将其中一个设置为visibility="gone"。可能，简历。

如果您想要始终保持两个按钮都可见，那么您需要使用布尔值跟踪当前状态：resumeLastClicked。然后，在每个onClickListener中，检查最后button点击了哪一个，如果您不想执行点击，则返回。

计时器从先前暂停的值恢复

1 个答案: