倒计时定时器如何实现onfinish方法

Question

我有一个倒计时计时器，我想在完成方法或某种代码上实现，以便当计时器停止时，文本视图变为 时间到了 并启动另一个方法（在活动中）。 澄清一下，计时器被赋予了一个从xx:xx格式倒数到零的起始数字。

定时器的类：

public class countdown_timer {
private  long pls;
private long millisInFuture;
private long countDownInterval;
private boolean status;
public countdown_timer(long pMillisInFuture, long pCountDownInterval) {
    this.millisInFuture = pMillisInFuture;
    this.countDownInterval = pCountDownInterval;
    this.pls = pMillisInFuture;

    status = false;
    Initialize();
}

public void Stop() {
    status = false;
}
public  void Reset() {
    millisInFuture = pls;
}

public long getCurrentTime() {
    return millisInFuture;
}

public void Start() {
    status = true;
}
public void Initialize()
{
    final Handler handler = new Handler();
    Log.v("status", "starting");
    final Runnable counter = new Runnable(){

        public void run(){
            long sec = millisInFuture/1000;
            if(status) {
                if(millisInFuture <= 0) {
                    Log.v("status", "done");
                } else {
                    Log.v("status", Long.toString(sec) + " seconds remain");
                    millisInFuture -= countDownInterval;
                    handler.postDelayed(this, countDownInterval);
                }
            } else {
                Log.v("status", Long.toString(sec) + " seconds remain and timer has stopped!");
                handler.postDelayed(this, countDownInterval);
            }
        }
    };

    handler.postDelayed(counter, countDownInterval);
}

定时器使用的活动：

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_card_game_2);
    //...find views
    mycounterup = new countdown_timer(startcard, 1000);
    mycounterdown = new countdown_timer(startcard, 1000);
    RefreshTimer();
    mycounterdown.Start();

  public void RefreshTimer()
{
    final Handler handler = new Handler();
    final Runnable counter = new Runnable(){

        public void run(){
            int minutes_up_start = (int) (mycounterup.getCurrentTime() / 1000) / 60;
            int seconds_up_start = (int) (mycounterup.getCurrentTime() / 1000) % 60;
            String time_2_up_start_formatted = String.format(Locale.getDefault(), "%02d:%02d", minutes_up_start, seconds_up_start);
            card_2_up.setText(time_2_up_start_formatted);

            int minutes_down_start = (int) (mycounterdown.getCurrentTime() / 1000) / 60;
            int seconds_down_start = (int) (mycounterdown.getCurrentTime() / 1000) % 60;
            String card_2_down_start_formatted = String.format(Locale.getDefault(), "%02d:%02d", minutes_down_start, seconds_down_start);
            card_2_down.setText(card_2_down_start_formatted);
            handler.postDelayed(this, 100);
        }
    };

    handler.postDelayed(counter, 100);
}

Answer 1

你可以使用CountDownTimer:

new CountDownTimer(endsIn * 1000, 1000) { 
public void onTick(long millisUntilFinished) { 
           timerTextView.setText(String.valueOf(millisUntilFinished/1000);
 } 
public void onFinish() {
} 
}.start();

或：

扩展CountDownTimer类：

public class countdown_timer extends CountDownTimer {
    TextView textView;
    @Override
    public void onTick(long millisInFuture) {
        long sec = millisInFuture/1000;
            if(millisInFuture <= 0) {
                Log.v("status", "done");

        } else {
            Log.v("status", Long.toString(sec) + " seconds remain and timer has stopped!");
        }
    }

    @Override
    public void onFinish() {
        if(textView != null){
            // change text in your textview
        }
    }



    public countdown_timer(long pMillisInFuture, long pCountDownInterval) {
        super(pMillisInFuture, pCountDownInterval);

    }
    public countdown_timer(TextView textView, long pMillisInFuture, long pCountDownInterval) {
        super(pMillisInFuture, pCountDownInterval);
        this.textView = textView;




    }






}

这里有两个构造函数，其中一个与您的示例中的相同，在第二个中，您还可以传递 TextView 对象并在 onFinish() 方法中使用它。

更新 2：

这里是活动中的CountDownTimer：

public class MainActivity extends AppCompatActivity {

    TextView textView;
    CountDownTimer mycounterdown;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        long startcard = 10000;
        textView = (TextView) findViewById(R.id.test);

        mycounterdown = new CountDownTimer(startcard, 1000) {
            @Override
            public void onTick(long mycounterup) {
                int minutes_up_start = (int) (mycounterup / 1000) / 60;
                int seconds_up_start = (int) (mycounterup / 1000) % 60;
                String time_2_up_start_formatted = String.format(Locale.getDefault(), "%02d:%02d", minutes_up_start, seconds_up_start);
                textView.setText(time_2_up_start_formatted);
            }

            @Override
            public void onFinish() {
                // call here other methods from activity

                testMethod();
            }
        };
        mycounterdown.start();

    }
    public void testMethod(){
        Toast.makeText(MainActivity.this, "Test Method called", Toast.LENGTH_SHORT).show();
    }

}

更新 3：如果最后一个刻度是 1，则不为零将倒计时间隔更改为 500 而不是 1000：

public class MainActivity extends AppCompatActivity {

    TextView textView;
    CountDownTimer mycounterdown;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        long startcard = 10000;
        textView = (TextView) findViewById(R.id.test);

        mycounterdown = new CountDownTimer(startcard, 500) {
            @Override
            public void onTick(long mycounterup) {
                int minutes_up_start = (int) (mycounterup / 1000) / 60;
                int seconds_up_start = (int) (mycounterup / 1000) % 60;
                String time_2_up_start_formatted = String.format(Locale.getDefault(), "%02d:%02d", minutes_up_start, seconds_up_start);
                textView.setText(time_2_up_start_formatted);
            }

            @Override
            public void onFinish() {
                // call here other methods from activity

                testMethod();
            }
        };
        mycounterdown.start();

    }
    public void testMethod(){
        Toast.makeText(MainActivity.this, "Test Method called", Toast.LENGTH_SHORT).show();
    }

}

注意：看看这个answer

Answer 2

首先，在你的计时器类中扩展CountDownTimer。

public class countdown_timer extends CountDownTimer {

}

这允许您实现一些方法。

@Override
public void onTick(long l) {

}

@Override
public void onFinish() {

}

您还必须实现与超类匹配的构造函数。您还可以添加一些附加参数。例如TextView

TextView textView;
public countdown_timer(long millisInFuture, long countDownInterval, TextView txt) {
    super(millisInFuture, countDownInterval);
    textView = txt;
}

onFinish() 是您想要的。还要确保您将此类用作CountDownTimer。然后你就可以启动你的计时器了。 希望对您有所帮助。