修改android系统默认字体大小

http://blog.chinaunix.net/uid-29535415-id-4150770.html

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

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1. <string-array name="entries_font_size">
   
2.         <item msgid="6490061470416867723">Small</item>
   
3.         <item msgid="3579015730662088893">Normal</item>
   
4.         <item msgid="1678068858001018666">Large</item>
   
5.         <item msgid="490158884605093126">Huge</item>
   
6.     </string-array>
   
7. 
   
8.     <string-array name="entryvalues_font_size" translatable="false">
   
9.         <item>0.85</item> 
   
10.         <item>1.0</item>
    
11.         <item>1.15</item>
    
12.         <item>1.30</item>
    
13.     </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

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1. public void readFontSizePreference(ListPreference pref) {
   
2.         try {
   
3.             mCurConfig.updateFrom(ActivityManagerNative.getDefault().getConfiguration()); 
   
4.         } catch (RemoteException e) {
   
5.             Log.w(TAG, "Unable to retrieve font size");
   
6.         }
   
7. 
   
8.         // mark the appropriate item in the preferences list
   
9.         int index = floatToIndex(mCurConfig.fontScale);
   
10.         pref.setValueIndex(index);
    
11. 
    
12.         // report the current size in the summary text
    
13.         final Resources res = getResources();
    
14.         String[] fontSizeNames = res.getStringArray(R.array.entries_font_size);
    
15.         pref.setSummary(String.format(res.getString(R.string.summary_font_size),
    
16.                 fontSizeNames[index]));
    
17.     }

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

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1. /**
   
2.      * Set this object to the system defaults.
   
3.      */
   
4.     public void setToDefaults() {
   
5.         fontScale = 1; //此处赋值为默认字体的放缩比例
6.         mcc = mnc = 0;
   
7.         locale = null;
   
8.         userSetLocale = false;
   
9.         touchscreen = TOUCHSCREEN_UNDEFINED;
   
10.         keyboard = KEYBOARD_UNDEFINED;
    
11.         keyboardHidden = KEYBOARDHIDDEN_UNDEFINED;
    
12.         hardKeyboardHidden = HARDKEYBOARDHIDDEN_UNDEFINED;
    
13.         navigation = NAVIGATION_UNDEFINED;
    
14.         navigationHidden = NAVIGATIONHIDDEN_UNDEFINED;
    
15.         orientation = ORIENTATION_UNDEFINED;
    
16.         screenLayout = SCREENLAYOUT_UNDEFINED;
    
17.         uiMode = UI_MODE_TYPE_UNDEFINED;
    
18.         screenWidthDp = compatScreenWidthDp = SCREEN_WIDTH_DP_UNDEFINED;
    
19.         screenHeightDp = compatScreenHeightDp = SCREEN_HEIGHT_DP_UNDEFINED;
    
20.         smallestScreenWidthDp = compatSmallestScreenWidthDp = SMALLEST_SCREEN_WIDTH_DP_UNDEFINED;
    
21.         densityDpi = DENSITY_DPI_UNDEFINED;
    
22.         seq = 0;
    
23.     }