リバースコンパイルカスタムアンドロイドのデフォルトは24 H形式で時間を表示します

//    Settings               24     ，                ，              ，             
//Home/Garfield/Android/source/packages/apps/Settings/src/com/android/settings/DateTimeSettings.java
public boolean onPreferenceTreeClick(Preference preference) {
        if (preference == mDatePref) {
            //......
        } else if (preference == mTimePref) {
            //......
        } else if (preference == mTime24Pref) {
            //       ，  set24Hour         ，    
            final boolean is24Hour = ((SwitchPreference)mTime24Pref).isChecked();
            set24Hour(is24Hour);
            //......
        }
        return super.onPreferenceTreeClick(preference);
    }

//               
    private void set24Hour(boolean is24Hour) {
        //     java  ，   HOURS_24 HOURS_12     ，      "24" "12"
        //     Settings.System.putString，                   。
        Settings.System.putString(getContentResolver(),
                Settings.System.TIME_12_24,
                is24Hour? HOURS_24 : HOURS_12);
    }
//            Settings.System.TIME_12_24    ，         ：https://developer.android.com/reference/android/provider/Settings.System#TIME_12_24

//           ，    "time_12_24"，      "time_12_24"   "12"  "24"

//Settings/DatabaseHelper.java
    private void loadSettings(SQLiteDatabase db) {
        loadSystemSettings(db);//                
        loadSecureSettings(db);//                   、      
        // The global table only exists for the 'owner/system' user
        if (mUserHandle == UserHandle.USER_SYSTEM) {
            loadGlobalSettings(db);
        }
    }

//    loadSystemSettings()    
    private void loadSystemSettings(SQLiteDatabase db) {
        SQLiteStatement stmt = null;
        try {
            //.......
            //     Settings.System.SCREEN_BRIGHTNESS         ，      Settings.System.TIME_12_24    ，            
            //        ，        、    ，         R.bool.def_       
            //  def_              
            loadIntegerSetting(stmt, Settings.System.SCREEN_BRIGHTNESS,
                    R.integer.def_screen_brightness);
            loadBooleanSetting(stmt, Settings.System.SCREEN_BRIGHTNESS_MODE,
                    R.bool.def_screen_brightness_automatic_mode);
            loadDefaultAnimationSettings(stmt);
            loadBooleanSetting(stmt, Settings.System.ACCELEROMETER_ROTATION,
                    R.bool.def_accelerometer_rotation);
            loadDefaultHapticSettings(stmt);
            loadBooleanSetting(stmt, Settings.System.NOTIFICATION_LIGHT_PULSE,
                    R.bool.def_notification_pulse);
            loadUISoundEffectsSettings(stmt);
            loadIntegerSetting(stmt, Settings.System.POINTER_SPEED,
                    R.integer.def_pointer_speed);
            //........
        } finally {
            if (stmt != null) stmt.close();
        }
    }

<resources>
    <bool name="def_dim_screen">truebool>
    <integer name="def_screen_off_timeout">60000integer>
    <integer name="def_sleep_timeout">-1integer>
    <bool name="def_airplane_mode_on">falsebool>
    <bool name="def_theater_mode_on">falsebool>
    
    <string name="def_airplane_mode_radios" translatable="false">cell,bluetooth,wifi,nfc,wimaxstring>
    <string name="airplane_mode_toggleable_radios" translatable="false">bluetooth,wifi,nfcstring>
    <string name="def_bluetooth_disabled_profiles" translatable="false">0string>