Android 应用统一字体设置 typeface

字体

字体有三个粒度

1. style

宽、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

字符构造：

等宽字母：MONOSPACE（每个字母一样宽）
衬线：SERIF (字母的边缘会加个横线)
无衬线：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。看下系统默认配置下的 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的默认字体是VivoFont.ttf，更换字体样式时，直接替换 VivoFont.ttf 文件

TextView设置字体

根据上述 typeface、style、family来确定真正的TypeFace加载对象。

强制设置APP的字体，且不受系统影响

添加应用theme，设置facetype为SERIF （也就是有衬线的字体）
在Application中，反射更改TypeFace中 public static final Typeface SERIF;
如果没有指定 family、typeface，则serif的typeface，直接读 TypeFace中的static变量 SERIF

具体更改

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();}}

当然推荐，异步线程initFont，因为有I/O操作.
/system/fonts/Roboto-Regular.ttf 你可以替换成别的
- 解析 /system/etc/fonts.xml找第一个的字体（基本是默认字体）
- 或者从assets里读取，你自己的ttf

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

Roboto字体

2011年4.0发行，2014年5.0重新设计了一版

Roboto (/roʊˈbɒt.oʊ/)[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”.

其他相关

升级版本可以创建字体，但我没实验。

字体：

网页字体不受影响
其他受影响

代码

StackOverflow 解析代码1

这个应该是老版本的，不过可以借鉴下

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;
}