字體

字體有三個粒度

1. style

寬、粗、斜

public static final int NORMAL = 0;public static final int BOLD = 1;public static final int ITALIC = 2;public static final int BOLD_ITALIC = 3;

2. typeface

字符構造：

• 等寬字母：MONOSPACE（每個字母一樣寬）
• 襯線：SERIF (字母的邊緣會加個橫線)
• 無襯線：sans-serif, sans serif, gothic（哥特式的）, sans

public static final Typeface DEFAULT;/*** The default BOLD typeface object. Note: this may be not actually be* bold, depending on what fonts are installed. Call getStyle() to know* for sure.*/public static final Typeface DEFAULT_BOLD;/** The NORMAL style of the default sans serif typeface. */public static final Typeface SANS_SERIF;/** The NORMAL style of the default serif typeface. */public static final Typeface SERIF;/** The NORMAL style of the default monospace typeface. */public static final Typeface MONOSPACE;

3. font family

更大的粒度，比如Roboto family。看下系統默認配置下的 font family

<familyset version="22"><!-- first font is default --><!-- vivo chenyidian modify for FONT_EXTEND begin --><family name="sans-serif"><font weight="400" style="normal">VivoFont.ttf</font></family><!-- vivo chenyidian modify for FONT_EXTEND end --><!-- vivo chenyidian modify for FONT_EXTEND remove the name ="sans-serif" begin --><family><!-- vivo zhoujie modify for FONT_EXTEND end --><font weight="100" style="normal">Roboto-Thin.ttf</font><font weight="100" style="italic">Roboto-ThinItalic.ttf</font><font weight="300" style="normal">Roboto-Light.ttf</font><font weight="300" style="italic">Roboto-LightItalic.ttf</font><font weight="400" style="normal">Roboto-Regular.ttf</font><font weight="400" style="italic">Roboto-Italic.ttf</font><font weight="500" style="normal">Roboto-Medium.ttf</font><font weight="500" style="italic">Roboto-MediumItalic.ttf</font><font weight="900" style="normal">Roboto-Black.ttf</font><font weight="900" style="italic">Roboto-BlackItalic.ttf</font><font weight="700" style="normal">Roboto-Bold.ttf</font><font weight="700" style="italic">Roboto-BoldItalic.ttf</font></family>

vivo的默認字體是VivoFont.ttf，更換字體樣式時，直接 替換 VivoFont.ttf 文件

TextView設置字體

根據 上述 typeface、style、family來確定真正的TypeFace加載對象。

強制設置APP的字體，且不受系統影響

添加應用theme，設置facetype為SERIF （也就是有襯線的 字體）

在Application中，反射更改TypeFace中 public static final Typeface SERIF;

如果沒有指定 family、typeface，則serif的typeface，直接讀 TypeFace中的static變量 SERIF

具體更改

res/styles.xml

<style name="AppTheme" parent="Theme.Design.Light.NoActionBar"><item name="android:typeface">serif</item></style>

AndroidManifest.xml

<applicationandroid:name=".YourApplication"android:theme="@style/AppTheme"

YourApplication

public void onCreate() {initFont();}public void initFont() {final Typeface tf = Typeface.createFromFile("/system/fonts/Roboto-Regular.ttf");try {Field defaultField = Typeface.class.getDeclaredField("SERIF");defaultField.setAccessible(true);defaultField.set(null, tf);} catch (Exception e) {e.printStackTrace();}}

• 當然推薦，異步線程initFont，因為有I/O操作.
• /system/fonts/Roboto-Regular.ttf 你可以替換成別的
  • 解析 /system/etc/fonts.xml找第一個的字體（基本是默認字體）
  • 或者從assets里讀取，你自己的ttf

Typeface tf= Typeface.createFromAsset(getAssets(),"fonts/Tahoma.ttf"); textview .setTypeface(tf);

Roboto字體

2011年4.0發行，2014年5.0重新設計了一版

Roboto (/ro??b?t.o?/)[1] is a neo-grotesque sans-serif typeface family developed by Google as the system font for its mobile operating system Android, and released in 2011 for Android 4.0 “Ice Cream Sandwich”.[2]

The entire font family has been licensed under the Apache license.[3] In 2014, Roboto was redesigned for Android 5.0 “Lollipop”.

相關目錄

系統默認字體配置文件

• /system/etc/fonts.xml
• /system/etc/system_fonts.xml
• 具體目錄根據 ROM版本，我測的vivo x 20A, Android 8.1.0 的路徑是 /system/etc/fonts.xml

StackOverflow 解析代碼1

默認字體tts文件目錄

/system/fonts

$ adb shell PD1709:/ $ ls /system/fonts AndroidClock.ttf NotoSansBengali-Regular.ttf NotoSansGurmukhi-Regular.ttf NotoSansMalayalamUI-Bold.ttf NotoSansSylotiNagri-Regular.ttf NotoSerif-BoldItalic.ttf CarroisGothicSC-Regular.ttf NotoSansBengaliUI-Bold.ttf NotoSansGurmukhiUI-Bold.ttf NotoSansMalayalamUI-Regular.ttf NotoSansSymbols-Regular-Subsetted.ttf NotoSerif-Italic.ttf ComingSoon.ttf NotoSansBengaliUI-Regular.ttf NotoSansGurmukhiUI-Regular.ttf NotoSansMandaic-Regular.ttf NotoSansSymbols-Regular-Subsetted2.ttf NotoSerif-Regular.ttf CutiveMono.ttf NotoSansBrahmi-Regular.ttf NotoSansHanunoo-Regular.ttf NotoSansMeeteiMayek-Regular.ttf NotoSansSyriacEastern-Regular.ttf Padauk.ttf DancingScript-Bold.ttf NotoSansBuginese-Regular.ttf NotoSansHebrew-Bold.ttf NotoSansMongolian-Regular.ttf NotoSansSyriacEstrangela-Regular.ttf Roboto-Black.ttf //...

其他相關

升級版本可以創建字體，但我沒實驗。

字體：

網頁字體 不受影響

其他受影響

字體大小：

• 網頁受影響
• 其他
  • 用dp為字號單位 不受影響
  • 用sp為字號單位 受影響

代碼

• StackOverflow 解析代碼1

這個應該是老版本的，不過可以借鑒下

import android.util.Xml;import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException;public String getDefaultFont() {System.out.println("getFontList(): entry");File configFilename = new File("/system/etc/system_fonts.xml");String defaultFontName = "";TTFAnalyzer analyzer = new TTFAnalyzer();try {FileInputStream fontsIn = new FileInputStream(configFilename);XmlPullParser parser = Xml.newPullParser();parser.setInput(fontsIn, null);Boolean done = false;Boolean getTheText = false;int eventType;String defaultFont = "";while (!done) {eventType = parser.next();if (eventType == parser.START_TAG && parser.getName().equalsIgnoreCase("file")) {// the text is next up -- pull itgetTheText = true;}if (eventType == parser.TEXT && getTheText == true) {// first namedefaultFont = parser.getText();System.out.println("text for file tag:" + defaultFont);done = true;}if (eventType == parser.END_DOCUMENT) {System.out.println("hit end of system_fonts.xml document");done = true;}}if (defaultFont.length() > 0) {// found the font filename, most likely in /system/fonts. Now pull out the human-readable// string from the font fileSystem.out.println("Figuring out default Font info");String fontname = analyzer.getTtfFontName("/system/fonts/" + defaultFont);if ( fontname != null ) {System.out.println("found font info: " + fontname);defaultFontName = fontname;} }} catch (RuntimeException e) {System.err.println("Didn't create default family (most likely, non-Minikin build)");// TODO: normal in non-Minikin case, remove or make error when Minikin-only} catch (FileNotFoundException e) {System.err.println("GetDefaultFont: config file Not found");} catch (IOException e) {System.err.println("GetDefaultFont: IO exception: " + e.getMessage());} catch (XmlPullParserException e) {System.err.println("getDefaultFont: XML parse exception " + e.getMessage());}return defaultFontName; }

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