Android Open Source - GraphView Date As X Axis Label Formatter

From Project

Back to project page GraphView.

License

The source code is released under:

GNU General Public License

If you think the Android project GraphView listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

/**
 * GraphView// w  w  w  .j a va 2 s  . c  o  m
 * Copyright (C) 2014  Jonas Gehring
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License,
 * with the "Linking Exception", which can be found at the license.txt
 * file in this program.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * with the "Linking Exception" along with this program; if not,
 * write to the author Jonas Gehring <g.jjoe64@gmail.com>.
 */
package com.jjoe64.graphview.helper;

import android.content.Context;

import com.jjoe64.graphview.DefaultLabelFormatter;

import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * Helper class to use date objects as x-values.
 * This will use your own Date Format or by default
 * the Android default date format to convert
 * the x-values (that has to be millis from
 * 01-01-1970) into a formatted date string.
 *
 * See the DateAsXAxis example in the GraphView-Demos project
 * to see a working example.
 *
 * @author jjoe64
 */
public class DateAsXAxisLabelFormatter extends DefaultLabelFormatter {
    /**
     * the date format that will convert
     * the unix timestamp to string
     */
    protected final DateFormat mDateFormat;

    /**
     * calendar to avoid creating new date objects
     */
    protected final Calendar mCalendar;

    /**
     * create the formatter with the Android default date format to convert
     * the x-values.
     *
     * @param context the application context
     */
    public DateAsXAxisLabelFormatter(Context context) {
        mDateFormat = android.text.format.DateFormat.getDateFormat(context);
        mCalendar = Calendar.getInstance();
    }

    /**
     * create the formatter with your own custom
     * date format to convert the x-values.
     *
     * @param context the application context
     * @param dateFormat custom date format
     */
    public DateAsXAxisLabelFormatter(Context context, DateFormat dateFormat) {
        mDateFormat = dateFormat;
        mCalendar = Calendar.getInstance();
    }

    /**
     * formats the x-values as date string.
     *
     * @param value raw value
     * @param isValueX true if it's a x value, otherwise false
     * @return value converted to string
     */
    @Override
    public String formatLabel(double value, boolean isValueX) {
        if (isValueX) {
            // format as date
            mCalendar.setTimeInMillis((long) value);
            return mDateFormat.format(mCalendar.getTimeInMillis());
        } else {
            return super.formatLabel(value, isValueX);
        }
    }
}

Java Source Code List