Question

在我的新游戏中，您必须按一个按钮才能获得积分。玩家必须在5秒内按下按钮 - 如果花费更多时间，GameOverScreen将被打开。否则倒计时应重新开始。我试图将gameover();方法放在倒计时的finish()方法中，但似乎有可能始终启动finish方法并且不会取消。我怎样才能停止倒计时呢？

public class GameScreen extends Activity {
    public int score = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_game);
        Button count = (Button) findViewById(R.id.button1);
        text = (TextView) this.findViewById(R.id.textView3);
        tvscore = (TextView) findViewById(R.id.score);

        timer();
    }

    public void gameover() {
        Intent intent = new Intent(this, GameOverScreen.class);
        startActivity(intent);
    }

    public void onClick (View view) {
        score++;
        tvscore.setText(String.valueOf(score));
        timer();
    }

    public void timer(){
        new CountDownTimer(5000, 10) {
            public void onTick(long millisUntilFinished) {
                text.setText(""+String.format("%02d:%03d",
                        TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished)),
                        TimeUnit.MILLISECONDS.toMillis(millisUntilFinished) - TimeUnit.SECONDS.toMillis(TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished))
                        ));
                if(animationRunning) {
                    cancel();
                }
            }
            public void onFinish() {
                text.setText("Too slow.");
                gameover();
            }
        }.start();
    }
}

Answer 1

这是实现您想要的简单而复杂的方式。

在全局级别定义CountDownTimer的对象

CountDownTimer  mCountDownTimer  ;

在onCreateView中：

mCountDownTimer = new CountDownTimer(5000, 10) {
        public void onTick(long millisUntilFinished) {
           text.setText(""+String.format("%02d:%03d",
           TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished)),
           TimeUnit.MILLISECONDS.toMillis(millisUntilFinished) - TimeUnit.SECONDS.toMillis(TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished));           
           }

         @Override
         public void onFinish() {
            text.setText("Too slow.");
            gameover();  
         }
     };
 mCountDownTimer.start();

在onClick（）

  public void onClick (View view) 
    {
        mCountDownTimer.cancel();
        score++;
        tvscore.setText(String.valueOf(score));
        mCountDownTimer.start();

    }

Answer 2

像这样更新您的计时器代码：

private boolean isTimerCanceled = false;

public void timer(){ 
        new CountDownTimer(5000, 10) { 
            public void onTick(long millisUntilFinished) {
                text.setText(""+String.format("%02d:%03d",
                        TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished)),
                        TimeUnit.MILLISECONDS.toMillis(millisUntilFinished) - TimeUnit.SECONDS.toMillis(TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished))
                        ));                     
                if(animationRunning) 
                {  
                    isTimerCanceled  = true;
                    cancel();
                } else{
                   isTimerCanceled = false;
                }             
            }
            public void onFinish() 
            {
                if (!isTimerCanceled){
                text.setText("Too slow.");  
                gameover();    
               }
            }
         }.start();    
 }

android - 倒计时后打开活动

2 个答案: