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DateSorter.javaAPI DocAndroid 5.1 API4115Thu Mar 12 22:22:10 GMT 2015android.webkit

DateSorter

public class DateSorter extends Object
Sorts dates into the following groups: Today Yesterday seven days ago one month ago older than a month ago

Fields Summary
private static final String
LOGTAG
public static final int
DAY_COUNT
must be >= 3
private long[]
mBins
private String[]
mLabels
private static final int
NUM_DAYS_AGO
Constructors Summary
public DateSorter(android.content.Context context)

param
context Application context


             
       
        Resources resources = context.getResources();

        Calendar c = Calendar.getInstance();
        beginningOfDay(c);
        
        // Create the bins
        mBins[0] = c.getTimeInMillis(); // Today
        c.add(Calendar.DAY_OF_YEAR, -1);
        mBins[1] = c.getTimeInMillis();  // Yesterday
        c.add(Calendar.DAY_OF_YEAR, -(NUM_DAYS_AGO - 1));
        mBins[2] = c.getTimeInMillis();  // Five days ago
        c.add(Calendar.DAY_OF_YEAR, NUM_DAYS_AGO); // move back to today
        c.add(Calendar.MONTH, -1);
        mBins[3] = c.getTimeInMillis();  // One month ago

        // build labels
        Locale locale = resources.getConfiguration().locale;
        if (locale == null) {
            locale = Locale.getDefault();
        }
        LocaleData localeData = LocaleData.get(locale);
        mLabels[0] = localeData.today;
        mLabels[1] = localeData.yesterday;

        int resId = com.android.internal.R.plurals.last_num_days;
        String format = resources.getQuantityString(resId, NUM_DAYS_AGO);
        mLabels[2] = String.format(format, NUM_DAYS_AGO);

        mLabels[3] = context.getString(com.android.internal.R.string.last_month);
        mLabels[4] = context.getString(com.android.internal.R.string.older);
Methods Summary
private voidbeginningOfDay(java.util.Calendar c)
Calcuate 12:00am by zeroing out hour, minute, second, millisecond

        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
public longgetBoundary(int index)

param
index date bin index as returned by getIndex()
return
date boundary at given index

        int lastDay = DAY_COUNT - 1;
        // Error case
        if (index < 0 || index > lastDay) index = 0;
        // Since this provides a lower boundary on dates that will be included
        // in the given bin, provide the smallest value
        if (index == lastDay) return Long.MIN_VALUE;
        return mBins[index];
public intgetIndex(long time)

param
time time since the Epoch in milliseconds, such as that returned by Calendar.getTimeInMillis()
return
an index from 0 to (DAY_COUNT - 1) that identifies which date bin this date belongs to

        int lastDay = DAY_COUNT - 1;
        for (int i = 0; i < lastDay; i++) {
            if (time > mBins[i]) return i;
        }
        return lastDay;
public java.lang.StringgetLabel(int index)

param
index date bin index as returned by getIndex()
return
string label suitable for display to user

        if (index < 0 || index >= DAY_COUNT) return "";
        return mLabels[index];