Question

Hurro!
I’m trying my hand at writing my first Android app, and I’ve hit a brick wall.

I want to allow the user to set a ‘start’ and a ‘stop’ time, for a daily schedule. I have sucessfully implemented the TimePickerDialog, and the TextView next to it, but I can’t for the LIFE of me figure out how to save the user selected time to a SharedPreferences string.

Code is as follows (stripped down for clarity’s sake):

@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;
    }

I assume that the time should be saved at the same time that the TextView is updated… but I have no idea how to do this -.-

I’ve now spent a good 5 or 6 hours looking for an answer, but I literally can’t find one. I’ve experimented with the SharedPreferences.Editor, but that won’t work because I need to store the time as a long, not a String.
I’m at the end of my rope, and I’d really appreciate some help!!

Answer 1

You have to do like this

private TimePickerDialog.OnTimeSetListener mTimeSetListenerStart =
        new TimePickerDialog.OnTimeSetListener() {
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                mHourStart = hourOfDay;
                mMinuteStart = minute;
                updateDisplayStart();

                Calendar cal = Calendar.getInstance();
                cal.set(Calendar.HOUR_OF_DAY, hourOfDay);
                cal.set(Calendar.MINUTE, minute);
                mUserSettings.edit().putLong("starttime", cal.getTimeInMillis()).commit();

            }
        };