我需要从另一个类获取变量到另一个[重复]

Question

我需要从SetAlarmActivity 类中获取变量date 到MainActivity

SetAlarmActivity

     }
    });
    tvSTART.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Calendar mcurrentTime = Calendar.getInstance();
            int hour = mcurrentTime.get(Calendar.HOUR_OF_DAY);
            int minute = mcurrentTime.get(Calendar.MINUTE);
            TimePickerDialog mTimePicker;
            mTimePicker = new TimePickerDialog(SetAlarmActivity.this, new TimePickerDialog.OnTimeSetListener() {
                @Override
                public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) {
                    tvSTART.setText( selectedHour + ":" + selectedMinute);
                    tv_START = ( selectedHour + ":" + selectedMinute);
                    DateFormat format = new SimpleDateFormat("h:mm", Locale.ENGLISH);
                    try {
                       Date date = format.parse(tv_START);
                    } catch (ParseException e) {
                        e.printStackTrace();
                    }
                }
            }, hour, minute, true);//Yes 24 hour time
            mTimePicker.setTitle("Select Start Time");
            mTimePicker.show();

        }
    });

Answer 1

你需要声明一个接口，并实现方法。

使用类似Android: TimePickerDialog - TimePickerDialog.OnTimeSetListener的东西

希望对你有所帮助。

Answer 2

尝试将您的变量日期设为public static，以便您可以在另一个类（例如 MainActivity）中访问它。