Android Studio：如何向 CountDownTimer 添加“开始”按钮

Question

伙计们，我到处寻找这个问题，遗憾的是，我找不到解决方案：/ 我的问题在 CountDownTimer 中，我想通过按下按钮来启动它，但现在它会自动启动。这是我的代码：

`public class newgame extends Activity {
    int guessCount = 0;
    TextView textCount;
    Button buttonCount;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_newgame);

    final TextView textView = (TextView) findViewById(R.id.textView);
    buttonCount = (Button) findViewById(R.id.button);

    buttonCount.setOnClickListener(new View.OnClickListener() {
        public void onClick(View arg0) {
            guessCount++;
            textView.setText("Clicks: " + guessCount);
        }
    });
    final TextView textic = (TextView) findViewById(R.id.textView2);
    CountDownTimer Count = new CountDownTimer(15000, 1000) {
        public void onTick(long millisUntilFinished) {
            int seconds = (int) ((millisUntilFinished / 1000));
            textic.setText("Time Left: " + millisUntilFinished / 1000);
        }

        public void onFinish() {
            textic.setText("Time's Up!");
            buttonCount.setEnabled(false);
        }



         };
    Count.start();
}`

有人可以帮帮我吗？ :)

Answer 1

CountDownTimer 有一个start() 方法，您可以将其用于按钮点击事件，例如

CountDownTimer timer = new CountDownTimer(5000, 100) {

    @Override
    public void onTick(long millisUntilFinished) {
        //your code     
    }

    @Override
    public void onFinish() {
        // your code
    }
};
timer.start();

Answer 2

在您的活动中使用此代码，我希望您能找到答案...

公共类 MainActivity 扩展 Activity {

CountDownTimer countDownTimer;
TextView tvTimer;
  long startTime = 1 * 1000;
  long interval = 1 * 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    tvTimer=(TextView)findViewById(R.id.tvTimer);
    countDownTimer = new MyCountDownTimer(startTime, interval);
    findViewById(R.id.button1).setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            countDownTimer.start();
        }
    });
}
public class MyCountDownTimer extends CountDownTimer 
{
    int  count=10;
    public MyCountDownTimer(long startTime, long interval) 
    {
        super(startTime, interval);
    }

    @Override
    public void onFinish() {
        tvTimer.setText("Time's Up...!");

    }

    @Override
    public void onTick(long millisUntilFinished) {
        int interval=(int)millisUntilFinished/100;
             tvTimer.setText("0"+interval);
    }
}

}

Answer 3

试试这个代码

          private TextView txtCount, textViewTimer;

  private Button btnCount, btnRestart;

   int count = 0;

   boolean[] timerProcessing = { false };

  boolean[] timerStarts = { false };

   private MyCount timer;


      @Override




     protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

txtCount = (TextView) findViewById(R.id.textView1);
txtCount.setText(String.valueOf(count));
btnCount = (Button) findViewById(R.id.button1);
btnRestart = (Button) findViewById(R.id.button2);

textViewTimer = (TextView) findViewById(R.id.textView2);

timer = new MyCount(10000, 1);

btnCount.setOnClickListener(new View.OnClickListener() {
    public void onClick(View arg0) {
        // start timer once when button first click
        if (!timerStarts[0]) {
            timer.start();
            timerStarts[0] = true;
            timerProcessing[0] = true;
        }

        if (timerProcessing[0]) {
            count++;
            txtCount.setText(String.valueOf(count));
        }
    }
});
btnRestart.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        timerProcessing[0] = true;
        count = 0;
        txtCount.setText(String.valueOf(count));
        timer.cancel();
        timer.start();
    }
});


   }




         public class MyCount extends CountDownTimer {

public MyCount(long millisInFuture, long countDownInterval) {

    super(millisInFuture, countDownInterval);

}

@Override
public void onFinish() {
    textViewTimer.setText("0:000");
    timerProcessing[0] = false;
}

@Override
public void onTick(long millisUntilFinished) {
    textViewTimer.setText("" + millisUntilFinished / 1000 + ":"
            + millisUntilFinished % 1000);

}

}

Answer 4

您必须将 Count.start() 放在某个 onClick 方法中。这些是基础知识，您可以轻松找到有关按按钮处理单击事件的信息。不要偷懒。