TimePreference.java

package com.movisens.gattsensorexample.activities;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;

import android.R.string;
import android.content.Context;
import android.content.res.TypedArray;
import android.preference.DialogPreference;
import android.text.format.DateFormat;
import android.util.AttributeSet;
import android.view.View;
import android.widget.TimePicker;

public class TimePreference extends DialogPreference {
	private Calendar calendar;
	private TimePicker picker = null;
	private SimpleDateFormat timeFormat = new SimpleDateFormat("HH:mm",
			Locale.US);

	public TimePreference(Context ctxt, AttributeSet attrs) {
		super(ctxt, attrs);

		setPositiveButtonText(string.ok);
		setNegativeButtonText(string.cancel);
		calendar = new GregorianCalendar();
	}

	@Override
	protected View onCreateDialogView() {
		picker = new TimePicker(getContext());

		return (picker);
	}

	@Override
	protected void onBindDialogView(View v) {
		super.onBindDialogView(v);
		picker.setIs24HourView(DateFormat.is24HourFormat(getContext()));
		picker.setCurrentHour(calendar.get(Calendar.HOUR_OF_DAY));
		picker.setCurrentMinute(calendar.get(Calendar.MINUTE));
	}

	@Override
	protected void onDialogClosed(boolean positiveResult) {
		super.onDialogClosed(positiveResult);

		if (positiveResult) {
			calendar.set(Calendar.HOUR_OF_DAY, picker.getCurrentHour());
			calendar.set(Calendar.MINUTE, picker.getCurrentMinute());

			CharSequence summary = getSummary();
			setSummary(summary);
			if (callChangeListener(summary)) {
				persistString(summary.toString());
				notifyChanged();
			}
		}
	}

	@Override
	protected Object onGetDefaultValue(TypedArray a, int index) {
		return (a.getString(index));
	}

	@Override
	protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
		String time = null;

		if (restoreValue) {
			if (defaultValue == null) {
				time = getPersistedString("00:00");
			} else {
				time = getPersistedString(defaultValue.toString());
			}
		} else {
			time = defaultValue.toString();
		}

		try {
			calendar.setTime(timeFormat.parse(time));
		} catch (ParseException e) {
			e.printStackTrace();
		}
	}

	@Override
	public CharSequence getSummary() {
		if (calendar == null) {
			return null;
		}
		return DateFormat.getTimeFormat(getContext()).format(
				new Date(calendar.getTimeInMillis()));
	}
}