java - SharedPreferences 和 TimePickerDialog

Question

哈罗!
我正在尝试编写我的第一个 Android 应用程序，但遇到了困难。

我想允许用户为每日计划设置“开始”和“停止”时间。我已经成功实现了 TimePickerDialog 及其旁边的 TextView，但我一生都无法弄清楚如何将用户选择的时间保存到 SharedPreferences 字符串中。

代码如下(为了清晰起见，进行了精简):

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.setup);
        // Retrieve the shared preferences
        mUserSettings = getSharedPreferences(USER_PREFERENCES, MODE_PRIVATE);

        // capture our View elements
        mTimeDisplayStart = (TextView)  findViewById(R.id.TextView_ScheduleStart_Info);
        mPickTimeStart = (Button) findViewById(R.id.Button_ScheduleStart);

        // add a click listener to the button
        mPickTimeStart.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                showDialog(TIME_DIALOG_START);
            }
        });

        // get the current time
        final Calendar c = Calendar.getInstance();
        mHourStart = c.get(Calendar.HOUR_OF_DAY);
        mMinuteStart = c.get(Calendar.MINUTE);

        // display the current date
        updateDisplayStart();
    }

    // updates the time we display in the TextView
    private void updateDisplayStart() {
        mTimeDisplayStart.setText(
                new StringBuilder()
                .append(padStart(mHourStart)).append(":")
                .append(padStart(mMinuteStart)));
    }

    private static String padStart(int c) {
        if (c >= 10)
            return String.valueOf(c);
        else
            return "0" + String.valueOf(c);
    }

    // the callback received when the user "sets" the time in the dialog
    private TimePickerDialog.OnTimeSetListener mTimeSetListenerStart =
        new TimePickerDialog.OnTimeSetListener() {
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                mHourStart = hourOfDay;
                mMinuteStart = minute;
                updateDisplayStart();
            }
        };

    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
        case TIME_DIALOG_START:
            return new TimePickerDialog(this,
                    mTimeSetListenerStart, mHourStart, mMinuteStart, false);
        }
        return null;
    }

我认为应该在更新 TextView 的同时保存时间...但我不知道该怎么做 -.-

我现在已经花了 5 或 6 个小时来寻找答案，但我确实找不到答案。我已经尝试过 SharedPreferences.Editor，但这不起作用，因为我需要将时间存储为长整数，而不是字符串。
我已经束手无策了，非常感谢您的帮助!!

Answer 1

通过以下方法

    // updates the time we display in the TextView
         private void updateDisplayStart() {
            mTimeDisplayStart.setText(
                    new StringBuilder()
                    .append(padStart(mHourStart)).append(":")
                    .append(padStart(mMinuteStart)));
        });

     SharedPreferences settingsActivity = getSharedPreferences("todolist1",
                    Activity.MODE_PRIVATE);
            SharedPreferences.Editor prefEditor = settingsActivity.edit();

            prefEditor.putString("DateToDisplay",new StringBuilder()
                    .append(padStart(mHourStart)).append(":")
                    .append(padStart(mMinuteStart));  // updates the time we display in the TextView



        prefEditor.commit();
}

在此之后，无论您想要从共享首选项中检索数据，如下所示

SharedPreferences settingsActivity = getSharedPreferences("todolist1",
                Activity.MODE_PRIVATE);

        if (settingsActivity.contains(DateToDisplay)) {
            String saveddate = settingsActivity
                    .getString(DateToDisplay, "");