Java TimePicker 不返回正确的值

Question

在android项目中我有这个类

package mycalories.com.jalle.mycalories;

import android.app.Dialog;
import android.app.DialogFragment;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.text.format.Time;
import android.widget.TimePicker;

import java.util.Calendar;

public class TimePickerFragment extends DialogFragment implements
        TimePickerDialog.OnTimeSetListener {

    public static interface OnTimeSetListener {
        void onTimeSet(Time time);
    }

    private OnTimeSetListener onTimeSetListener;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final Calendar c = Calendar.getInstance();
        int hour = c.get(Calendar.HOUR_OF_DAY);
        int minute = c.get(Calendar.MINUTE);

       return new TimePickerDialog(getActivity(), this, hour, minute,
                DateFormat.is24HourFormat(getActivity()));
    }

    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
       if (onTimeSetListener != null) {
           Time newTime =new Time(hourOfDay+":"+minute+ "");
            onTimeSetListener.onTimeSet(newTime);
        }
    }

    public void setOnTimeSetListener(OnTimeSetListener onTimeSetListener) {
        this.onTimeSetListener = onTimeSetListener;
    }
}

应该返回选择的时间。在主要 Activity 中，我有按钮和文本字段:

Button btnTime = (Button) findViewById(R.id.btnTime);
        btnTime.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                TimePickerFragment timePicker = new TimePickerFragment();
                timePicker.show(getFragmentManager(), "timePicker");
                timePicker.setOnTimeSetListener(new OnTimeSetListener() {

                  @Override
                    public void onTimeSet(Time time) {

                    //  SimpleDateFormat HHMM = new SimpleDateFormat("hh:mm");

                        final EditText txtTime = (EditText) findViewById(R.id.txtTime);
                        txtTime.setText(time.toString());
                    }
                });
            }
        });

选择时间后，我应该采用 hh:mm 格式，但我得到的是 19700101T00000011:55(4,0,0,0,0)(显然没有选择当前时间而是默认时间)我猜想 onTimeSet 方法不对。有什么想法吗？

还有一个问题:如何在 diff Activity 中对多个文本框使用相同的 TimePicker 类？

Answer 1

Time API 有 3 个构造函数:无参数、String 参数和其他 Time 参数。您使用的构造函数是 String 构造函数，仅接受时区作为预期值，并将日期设置为 1970 年 1 月 1 日。

public Time (String timezone)

Construct a Time object in the timezone named by the string argument "timezone". The time is initialized to Jan 1, 1970.

如果您想返回包含今天日期和所选时间的时间，请尝试将代码更改为

public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
    if (onTimeSetListener != null) {
        Time newTime = new Time();
        newTime.setToNow();
        newTime.hour = hourOfDay;
        newTime.minute = minute;
        onTimeSetListener.onTimeSet(newTime);
    }
}