修改android系統預設字型大小

android系統字型大小在“設定” 中“顯示”中“字型大小”設定，一共提四種等級設定：小 、普通 、 大、 超大

四種等級選擇相應配置代碼位置

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>
 

以上配置是通過如下代碼載入後供給終端使用者選擇
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層會對系統的字型大小設定一個預設值，字型放縮比例為1，也就是對應顯示設定中的“普通”字型

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

 

  
/**

  
* Set this object to the system defaults.

  
*/

  
public void setToDefaults() {

  
fontScale = 1; //此處賦值為預設字型的放縮比例
  
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;

  
}