text——修改android系统默认字体大小

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转自http://www.360doc.com/content/15/0429/19/11813302_466876477.shtml

android系统字体大小在“设置” 中“显示”中“字体大小”设置，一共提四种等级设置：小、普通、大、超大

四种等级选择相应配置代码位置

packages/apps/setttings/res/values/arrays.xml

    <string-array name="entries_font_size">            <item msgid="6490061470416867723">Small</item>            <item msgid="3579015730662088893">Normal</item>            <item msgid="1678068858001018666">Large</item>            <item msgid="490158884605093126">Huge</item>        </string-array>        <string-array name="entryvalues_font_size" translatable="false">            <item>0.85</item>             <item>1.0</item>            <item>1.15</item>            <item>1.30</item>        </string-array>

以上配置是通过如下代码加载后供给终端用户选择

packages/app/settings/DisplaySettings.java

    public void readFontSizePreference(ListPreference pref) {            try {                mCurConfig.updateFrom(ActivityManagerNative.getDefault().getConfiguration());             } catch (RemoteException e) {                Log.w(TAG, "Unable to retrieve font size");            }            // mark the appropriate item in the preferences list            int index = floatToIndex(mCurConfig.fontScale);            pref.setValueIndex(index);            // report the current size in the summary text            final Resources res = getResources();            String[] fontSizeNames = res.getStringArray(R.array.entries_font_size);            pref.setSummary(String.format(res.getString(R.string.summary_font_size),                    fontSizeNames[index]));        }

在frameworks层会对系统的字体大小设置一个默认值，字体放缩比例为1，也就是对应显示设置中的“普通”字体

frameworks/base/core/java/android/content/res/Configuration.java

    /**         * Set this object to the system defaults.         */        public void setToDefaults() {            fontScale = 1; //此处赋值为默认字体的放缩比例            mcc = mnc = 0;            locale = null;            userSetLocale = false;            touchscreen = TOUCHSCREEN_UNDEFINED;            keyboard = KEYBOARD_UNDEFINED;            keyboardHidden = KEYBOARDHIDDEN_UNDEFINED;            hardKeyboardHidden = HARDKEYBOARDHIDDEN_UNDEFINED;            navigation = NAVIGATION_UNDEFINED;            navigationHidden = NAVIGATIONHIDDEN_UNDEFINED;            orientation = ORIENTATION_UNDEFINED;            screenLayout = SCREENLAYOUT_UNDEFINED;            uiMode = UI_MODE_TYPE_UNDEFINED;            screenWidthDp = compatScreenWidthDp = SCREEN_WIDTH_DP_UNDEFINED;            screenHeightDp = compatScreenHeightDp = SCREEN_HEIGHT_DP_UNDEFINED;            smallestScreenWidthDp = compatSmallestScreenWidthDp = SMALLEST_SCREEN_WIDTH_DP_UNDEFINED;            densityDpi = DENSITY_DPI_UNDEFINED;            seq = 0;        }

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