android 4.4 设置默认日期格式

我们想把默认日期格式设置成yyyy-MM-dd

1、首先我们找到\Settings\res\values\strings.xml中的：

    <string name="default_date_format"><xliff:g id="default_date_format">MM/dd/yyyy</xliff:g></string>将此处改成我们想要的，即：

     <string name="default_date_format"><xliff:g id="default_date_format">yyyy/MM/dd</xliff:g></string>

2、后台java源码控制 \Settings\src\com\android\settings\DateTimeSettings.java 中的  private void initUI()

 

 private void initUI() {
        boolean autoTimeEnabled = getAutoState(Settings.Global.AUTO_TIME);
        boolean autoTimeZoneEnabled = getAutoState(Settings.Global.AUTO_TIME_ZONE);

        Intent intent = getActivity().getIntent();
        boolean isFirstRun = intent.getBooleanExtra(EXTRA_IS_FIRST_RUN, false);

        mDummyDate = Calendar.getInstance();

        mAutoTimePref = (CheckBoxPreference) findPreference(KEY_AUTO_TIME);
        mAutoTimePref.setChecked(autoTimeEnabled);
        mAutoTimeZonePref = (CheckBoxPreference) findPreference(KEY_AUTO_TIME_ZONE);
        // Override auto-timezone if it's a wifi-only device or if we're still in setup wizard.
        // TODO: Remove the wifiOnly test when auto-timezone is implemented based on wifi-location.
        if (Utils.isWifiOnly(getActivity()) || isFirstRun) {
            getPreferenceScreen().removePreference(mAutoTimeZonePref);
            autoTimeZoneEnabled = false;
        }
        mAutoTimeZonePref.setChecked(autoTimeZoneEnabled);

        mTimePref = findPreference("time");
        mTime24Pref = findPreference("24 hour");
        mTimeZone = findPreference("timezone");
        mDatePref = findPreference("date");
        mDateFormat = (ListPreference) findPreference(KEY_DATE_FORMAT);
        if (isFirstRun) {
            getPreferenceScreen().removePreference(mTime24Pref);
            getPreferenceScreen().removePreference(mDateFormat);
        }

        //{{Await add
        String format = getResources().getString(R.string.default_date_format);
        Settings.System.putString(getContentResolver(),
                Settings.System.DATE_FORMAT, format);
        //}}

        String [] dateFormats = getResources().getStringArray(R.array.date_format_values);
        String [] formattedDates = new String[dateFormats.length];
        String currentFormat = getDateFormat();
        // Initialize if DATE_FORMAT is not set in the system settings
        // This can happen after a factory reset (or data wipe)       
        if (currentFormat == null) {
            currentFormat = "";
        }

        // Prevents duplicated values on date format selector.
        mDummyDate.set(mDummyDate.get(Calendar.YEAR), mDummyDate.DECEMBER, 31, 13, 0, 0);

        for (int i = 0; i < formattedDates.length; i++) {
            String formatted =
                    DateFormat.getDateFormatForSetting(getActivity(), dateFormats[i])
                    .format(mDummyDate.getTime());            
            if (dateFormats[i].length() == 0) {
                formattedDates[i] = getResources().
                    getString(R.string.normal_date_format, formatted);
            } else {
                formattedDates[i] = formatted;
            }
        }

        mDateFormat.setEntries(formattedDates);
        mDateFormat.setEntryValues(R.array.date_format_values);
        mDateFormat.setValue(currentFormat);

        mTimePref.setEnabled(!autoTimeEnabled);
        mDatePref.setEnabled(!autoTimeEnabled);
        mTimeZone.setEnabled(!autoTimeZoneEnabled);
    }