java - 倒数计时器 onTick 方法不起作用

Question

我有一个 CountDown 计时器，它获取 numberPicker 的值。我的倒计时计时器的文本将更改为数字选择器的值，但是当我点击开始按钮时，倒计时计时器 TextView 的值更改为不同的数字。所以我的问题是如何编辑我的代码，以便当我点击开始时它开始倒计时 textView 的值。这是我的代码...

public class MainActivity extends AppCompatActivity {
NumberPicker noPickerHours;
NumberPicker noPickerMinutes;
TextView textViewTime;
Button button;
CounterClass timer;
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    textViewTime = (TextView) findViewById(R.id.textView);

    noPickerMinutes = (NumberPicker) findViewById(R.id.numberPicker2);
    noPickerMinutes.setMaxValue(59);
    noPickerMinutes.setMinValue(0);
    noPickerHours = (NumberPicker) findViewById(R.id.numberPicker);
    noPickerHours.setMaxValue(24);
    noPickerHours.setMinValue(0);
    button = (Button)findViewById(R.id.button);



    button.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            timer.start();
        }
    });

    noPickerHours.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {


        @Override
        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
            timer = new CounterClass((newVal * 60 * 60), 1000);
            long millis = (newVal * 60 * 60 * 1000);
            String hms = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis), TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
                    TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));
            textViewTime.setText(hms);
        }
    });



    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });
}




public class CounterClass extends CountDownTimer {


    /**
     * @param millisInFuture    The number of millis in the future from the call
     *                          to {@link #start()} until the countdown is done and {@link #onFinish()}
     *                          is called.
     * @param countDownInterval The interval along the way to receive
     *                          {@link #onTick(long)} callbacks.
     */

    public CounterClass(long millisInFuture, long countDownInterval) {
        super(millisInFuture, countDownInterval);
    }



    @TargetApi(Build.VERSION_CODES.GINGERBREAD)
    @Override

    public void onTick(long millisUntilFinished) {
        long millis = millisUntilFinished;
        String hms = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis), TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
                TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis) * 60));
        System.out.println(hms);
        textViewTime.setText(hms);

    }

    @Override
    public void onFinish() {

    }


}}

谢谢:)

Answer 1

在您的 onValueChange() 中，您正在使用 (newVal * 60 * 60) 设置倒数计时器

timer = new CounterClass((newVal * 60 * 60), 1000);

然后你用长 milis (newVal * 60 * 60 * 1000) 设置 textview

long millis = (newVal * 60 * 60 * 1000);

因此与您初始化倒数计时器的内容相比，差异是 * 1000