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DatePickerDialog that honors the locale set by the app
package com.gilbert.wat.widget;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Calendar;
import android.app.DatePickerDialog;
import android.content.Context;
import android.os.Build;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import com.gilbert.wat.R;
/**
* This class is a version of DatePickerDialog that honors the locale set by the app instead of the locale of the system.
* According to the <a href="http://code.google.com/p/android/issues/detail?id=25107">bug report on Android framework</a>,
* The date picker is not using the String array of shortened month of the Context of the App[1].
* Instead it uses the System locale[2].
*
*
* [1]<code>context.getResources().getStringArray(R.array.short_months);</code>
* [2]<a href="http://www.grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/4.1.1_r1/android/widget/DatePicker.java#482">
* <code> mShortMonths[i] = DateUtils.getMonthString(Calendar.JANUARY + i, DateUtils.LENGTH_MEDIUM);</code>
* </a>
*
* This class is licensed under <a href="http://www.apache.org/licenses/LICENSE-2.0.html">Apache License 2.0</a>
*
* @author Wat Chun Pang Gilbert
*
*
*/
public class AppLocaleDatePickerDialog extends DatePickerDialog implements OnDateChangedListener {
private static final String TAG = AppLocaleDatePickerDialog.class.getSimpleName();
private static final String MONTH_LONG_FORMAT = "MMMMMM, yyyy";
protected DatePicker mDatePicker;
protected Calendar mCalendar;
private int mInitialYear;
private int mInitialMonth;
private int mInitialDay;
public AppLocaleDatePickerDialog(Context context, int theme,
OnDateSetListener callBack, int year, int monthOfYear,
int dayOfMonth) {
super(context, theme, callBack, year, monthOfYear, dayOfMonth);
pullDatePickerRefFromSuper();
initPicker(context);
mInitialYear = year;
mInitialMonth = monthOfYear;
mInitialDay = dayOfMonth;
mCalendar = Calendar.getInstance();
mDatePicker.init(mInitialYear, mInitialMonth, mInitialDay, this);
updateTitle(mInitialYear, mInitialMonth, mInitialDay);
}
public AppLocaleDatePickerDialog(Context context, OnDateSetListener callBack,
int year, int monthOfYear, int dayOfMonth) {
this(context, 0, callBack, year, monthOfYear, dayOfMonth);
}
/**
* Use reflection to use the Locale of the application for the month spinner.
*
* PS: DAMN DATEPICKER DOESN'T HONOR Locale.getDefault()
* <a href="http://code.google.com/p/android/issues/detail?id=25107">Bug Report</a>
* @param context
*/
public void initPicker(Context context) {
String monthPickerVarName;
String months[] = context.getResources().getStringArray(R.array.short_months);
if (Build.VERSION.SDK_INT >= 14) {
monthPickerVarName = "mMonthSpinner";
} else {
monthPickerVarName = "mMonthPicker";
}
try {
Field f[] = mDatePicker.getClass().getDeclaredFields();
for (Field field : f) {
if (field.getName().equals("mShortMonths")) {
field.setAccessible(true);
field.set(mDatePicker, months);
} else if (field.getName().equals(monthPickerVarName)) {
field.setAccessible(true);
Object o = field.get(mDatePicker);
if (Build.VERSION.SDK_INT >= 14) {
Method m = o.getClass().getDeclaredMethod("setDisplayedValues", String[].class);
m.setAccessible(true);
m.invoke(o, (Object)months);
} else {
Method m = o.getClass().getDeclaredMethod("setRange", int.class, int.class, String[].class);
m.setAccessible(true);
m.invoke(o, 1, 12, (Object)months);
}
}
}
} catch (Exception e) {
Log.e(TAG, e.getMessage(), e);
}
try {
final Method updateSpinner = mDatePicker.getClass().getDeclaredMethod("updateSpinners");
updateSpinner.setAccessible(true);
updateSpinner.invoke(mDatePicker);
updateSpinner.setAccessible(false);
} catch (Exception e) {
Log.e(TAG, e.getMessage(), e);
}
}
/**
* Create references of private variables named:
* <i>mDatePicker</i> &amp; <i>mCalendar</i>
* of the super class to this class.
*/
private void pullDatePickerRefFromSuper() {
Field superF[] = AppLocaleDatePickerDialog.class.getSuperclass().getDeclaredFields();
for(Field fi : superF) {
if(fi.getName().equals("mDatePicker")) {
fi.setAccessible(true);
try {
mDatePicker = (DatePicker)fi.get(this);
} catch (Exception e) {
Log.e(TAG, e.getMessage(), e);
}
} else if (fi.getName().equals("mCalendar")) {
fi.setAccessible(true);
try {
mCalendar = (Calendar)fi.get(this);
} catch (Exception e) {
Log.e(TAG, e.getMessage(), e);
}
}
}
}
public void onDateChanged(DatePicker view, int year, int month, int day) {
view.init(year, month, day, this);
updateTitle(year, month, day);
}
private void updateTitle(int year, int month, int day) {
mCalendar.set(Calendar.YEAR, year);
mCalendar.set(Calendar.MONTH, month);
mCalendar.set(Calendar.DAY_OF_MONTH, day);
setTitle(getMonthLongFormat(this.getContext()).format(mCalendar.getTime()));
}
/**
* @return the monthLongFormat
*/
public static SimpleDateFormat getMonthLongFormat(Context context) {
if (sMonthLongFormat != null) {
return sMonthLongFormat;
} else {
String prefLocale = PreferenceManager.getDefaultSharedPreferences(context
.getApplicationContext()).getString(PreferenceKey.DISPLAY_LANGUAGE, "en");
Locale displayLocale = new Locale(prefLocale);
return sMonthLongFormat = new SimpleDateFormat(MONTH_LONG_FORMAT, displayLocale);
}
}
}
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