setting中增加日期格式设置

主要是参考了息屏时间设置的Preference。
增加DateFormatController.java和DateFormatListPreference.java这2个文件。

//vendor\mediatek\proprietary\packages\apps\MtkSettings\src\com\android\settings\datetime\DateFormatController.java
public class DateFormatListPreference extends RestrictedListPreference{
    private final CharSequence[] mInitialEntries;
    private final CharSequence[] mInitialValues;

    public DateFormatListPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
        mInitialEntries = getEntries();
        mInitialValues = getEntryValues();
    }
}

intent发送前要调用addFlags(0x01000000)，否则会报错Background execution not allowed:******************

//vendor\mediatek\proprietary\packages\apps\MtkSettings\src\com\android\settings\datetime\DateFormatController.java
public class DateFormatController extends AbstractPreferenceController implements
        PreferenceControllerMixin, Preference.OnPreferenceChangeListener{

    private static final String TAG = "DateFormatController";

    private final String mDateFormatKey;

    public DateFormatController(Context context, String key) {
        super(context);
        mDateFormatKey = key;
    }

    @Override
    public boolean isAvailable() {
        return true;
    }

    @Override
    public String getPreferenceKey() {
        return mDateFormatKey;
    }

    @Override
    public void updateState(Preference preference) {
        final DateFormatListPreference dateFormatListPreference = (DateFormatListPreference) preference;
        final String value = Settings.System.getString(mContext.getContentResolver(), DATE_FORMAT);
        dateFormatListPreference.setValue(value);
        preference.setSummary(getDate(value));
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        String value = (String) newValue;
        Settings.System.putString(mContext.getContentResolver(), DATE_FORMAT, value);
        preference.setSummary(getDate(value));
        sendDateFormatUpdateBroadcast();
        return true;
    }

    private String getDate(String dateFormat){
        Date date = new Date(System.currentTimeMillis());
        String dateString = new SimpleDateFormat(dateFormat).format(date);
        return dateString;
    }

    private void sendDateFormatUpdateBroadcast() {
        Intent dateFormatUpdate = new Intent("android.intent.action.DATE_FORMAT_UPDATE");
        dateFormatUpdate.addFlags(0x01000000);
        mContext.sendBroadcast(dateFormatUpdate);
    }

}

DateTimeSettings中增加控制部分。private static final String KEY_DATE_FORMAT = "date_format";和controllers.add(new DateFormatController(context, KEY_DATE_FORMAT));
具体如下。

public class DateTimeSettings extends DashboardFragment implements
        TimePreferenceController.TimePreferenceHost, DatePreferenceController.DatePreferenceHost,
        AutoTimeExtPreferenceController.GPSPreferenceHost, DialogInterface.OnCancelListener {
    private static final String KEY_DATE_FORMAT = "date_format";
    ................
    @Override
    protected List<AbstractPreferenceController> getPreferenceControllers(Context context) {
        ................
        controllers.add(new DateFormatController(context, KEY_DATE_FORMAT));
        ................
    }

}

date_time_prefs中增加DateFormatListPreference。

//vendor\mediatek\proprietary\packages\apps\MtkSettings\res\xml\date_time_prefs.xml
<PreferenceScreen
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:settings="http://schemas.android.com/apk/res/com.android.settings"
    android:title="@string/date_and_time"
    settings:keywords="@string/keywords_date_and_time">

    ............
    <com.android.settings.DateFormatListPreference
        android:key="date_format"
        android:title="@string/title_date_format"
        android:summary="@string/summary_placeholder"
        android:entries="@array/date_format_entries"
        android:entryValues="@array/date_format_values" />

    <SwitchPreference
        android:key="24 hour"
        android:title="@string/date_time_24hour" />
</PreferenceScreen>

定义相关string和array 。

//vendor\mediatek\proprietary\packages\apps\MtkSettings\res\values\arrays.xml
    <string-array name="date_format_entries">
        <item>year-month-day</item>
        <item>month-day-year</item>
        <item>day-month-year</item>
    </string-array>

    <string-array name="date_format_values" translatable="false">
        <!-- Do not translate. -->
        <item>yyyy-MM-dd</item>
        <!-- Do not translate. -->
        <item>MM-dd-yyyy</item>
        <!-- Do not translate. -->
        <item>dd-MM-yyyy</item>
    </string-array>

//vendor\mediatek\proprietary\packages\apps\MtkSettings\res\values\strings.xml
    <string name="title_date_format">date format</string>

//vendor\mediatek\proprietary\packages\apps\MtkSettings\res\values-zh-rCN\arrays.xml
  <string-array name="date_format_entries">
    <item>年-月-日</item>
    <item>月-日-年</item>
    <item>日-月-年</item>
  </string-array>

//vendor\mediatek\proprietary\packages\apps\MtkSettings\res\values-zh-rCN\strings.xml
    <string name="title_date_format">日期格式</string>

SettingsProvider中增加Settings.System.DATE_FORMAT默认设置。

//vendor\mediatek\proprietary\packages\apps\SettingsProvider\src\com\android\providers\settings\DatabaseHelper.java
    private void loadSystemSettings(SQLiteDatabase db) {
        SQLiteStatement stmt = null;
        try {
            stmt = db.compileStatement("INSERT OR IGNORE INTO system(name,value)"
                    + " VALUES(?,?);");

            loadStringSetting(stmt,Settings.System.DATE_FORMAT,R.string.def_date_format);

              ....................
    }

//vendor\mediatek\proprietary\packages\apps\SettingsProvider\res\values\defaults.xml
    <string name="def_date_format" translatable="false">yyyy-MM-dd</string>

以下为桌面时钟布局修改部分。

AndroidManifest.xml中增加protected-broadcast定义，否则发送广播后会报错Sending non-protected broadcast，无法接受到广播。
增加<protected-broadcast android:name="android.intent.action.DATE_FORMAT_UPDATE" />

//frameworks/base/core/res/AndroidManifest.xml
    <protected-broadcast android:name="android.intent.action.SCREEN_OFF" />
    <protected-broadcast android:name="android.intent.action.SCREEN_ON" />
    <protected-broadcast android:name="android.intent.action.USER_PRESENT" />
    <protected-broadcast android:name="android.intent.action.TIME_SET" />
    <protected-broadcast android:name="android.intent.action.TIME_TICK" />
    <protected-broadcast android:name="android.intent.action.TIMEZONE_CHANGED" />
    <protected-broadcast android:name="android.intent.action.DATE_CHANGED" />

    <protected-broadcast android:name="android.intent.action.DATE_FORMAT_UPDATE" />

    <protected-broadcast android:name="android.intent.action.PRE_BOOT_COMPLETED" />
    <protected-broadcast android:name="android.intent.action.BOOT_COMPLETED" />

DigitalAppWidgetProvider中有3处修改。

1. 增加 private static final String ACTION_DATE_FORMAT_UPDATE = "android.intent.action.DATE_FORMAT_UPDATE";

2. 增加当收到广播时更新UI。

            case ACTION_DATE_FORMAT_UPDATE:
                Log.d(TAG,"ACTION_DATE_FORMAT_UPDATE");
                for (int widgetId : widgetIds) {
                    relayoutWidget(context, wm, widgetId, wm.getAppWidgetOptions(widgetId));
                }
                break;

3.修改getDateFormat(Context context)，修改中文和英文语言模式下的日期格式 。
增加

        if (locale.getCountry().equals("CN")){
            return Settings.System.getString(context.getContentResolver(), DATE_FORMAT) + " EEE";
        }else if (locale.getCountry().equals("US")){
            return "EEE, " + Settings.System.getString(context.getContentResolver(), DATE_FORMAT);
        }

修改后如下。

//vendor/mediatek/proprietary/packages/apps/DeskClock/src/com/android/alarmclock/DigitalAppWidgetProvider.java
public class DigitalAppWidgetProvider extends AppWidgetProvider {
    private static final String ACTION_DATE_FORMAT_UPDATE = "android.intent.action.DATE_FORMAT_UPDATE";


    @Override
    public void onReceive(@NonNull Context context, @NonNull Intent intent) {
         ...........

        final String action = intent.getAction();
        switch (action) {
            case ACTION_NEXT_ALARM_CLOCK_CHANGED:
            case ACTION_DATE_CHANGED:
            case ACTION_LOCALE_CHANGED:
            case ACTION_SCREEN_ON:
            case ACTION_TIME_CHANGED:
            case ACTION_TIMEZONE_CHANGED:
            case ACTION_ALARM_CHANGED:
            case ACTION_ON_DAY_CHANGE:
            case ACTION_WORLD_CITIES_CHANGED:
                for (int widgetId : widgetIds) {
                    relayoutWidget(context, wm, widgetId, wm.getAppWidgetOptions(widgetId));
                }
            case ACTION_DATE_FORMAT_UPDATE:
                Log.d(TAG,"ACTION_DATE_FORMAT_UPDATE");
                for (int widgetId : widgetIds) {
                    relayoutWidget(context, wm, widgetId, wm.getAppWidgetOptions(widgetId));
                }
                break;
        }
        ...........
    }


    /**
     * @return the locale-specific date pattern
     */
    private static String getDateFormat(Context context) {
        final Locale locale = Locale.getDefault();

        if (locale.getCountry().equals("CN")){
            return Settings.System.getString(context.getContentResolver(), DATE_FORMAT) + " EEE";
        }else if (locale.getCountry().equals("US")){
            return "EEE, " + Settings.System.getString(context.getContentResolver(), DATE_FORMAT);
        }

        final String skeleton = context.getString(R.string.abbrev_wday_month_day_no_year);
        return DateFormat.getBestDateTimePattern(locale, skeleton);
    }

}

receiver增加<action android:name="android.intent.action.DATE_FORMAT_UPDATE" />定义。

//vendor/mediatek/proprietary/packages/apps/DeskClock/AndroidManifest.xml
        <receiver
            android:name="com.android.alarmclock.DigitalAppWidgetProvider"
            android:label="@string/digital_gadget">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
                <action android:name="android.app.action.NEXT_ALARM_CLOCK_CHANGED" />
                <action android:name="android.intent.action.DATE_CHANGED" />
                <action android:name="android.intent.action.LOCALE_CHANGED" />
                <action android:name="android.intent.action.SCREEN_ON" />

                <action android:name="android.intent.action.DATE_FORMAT_UPDATE" />

                <action android:name="android.intent.action.TIME_SET" />
                <action android:name="android.intent.action.TIMEZONE_CHANGED" />
                <action android:name="com.android.deskclock.ALARM_CHANGED" />
                <action android:name="com.android.deskclock.ON_DAY_CHANGE" />
                <action android:name="com.android.deskclock.WORLD_CITIES_CHANGED" />
            </intent-filter>
            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/digital_appwidget" />
        </receiver>

参考链接：
在Android8.0上突破隐式广播的限制
[Q]Sending non-protected broadcast问题分析

日期操作类（DateFormat与SimpleDateFormat）的区别和使用详解

Java SimpleDateFormat 中英文时间格式化转换

android 时间获取