Android 各种默认字体样式设置

In XML

android:textStyle

• normal
• bold
• italic

android:fontFamily

android:fontFamily="sans-serif"           // roboto regular
android:fontFamily="sans-serif-light"     // roboto light
android:fontFamily="sans-serif-condensed" // roboto condensed
android:fontFamily="sans-serif-black"     // roboto black
android:fontFamily="sans-serif-thin"      // roboto thin (android 4.2)
android:fontFamily="sans-serif-medium"    // roboto medium (android 5.0)

可以把后面的字符串放到 fonts.xml 或 strings.xml 中，以便复用。

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="font_family_light">sans-serif-light</string>
    <string name="font_family_medium">sans-serif-medium</string>
    <string name="font_family_regular">sans-serif</string>
    <string name="font_family_condensed">sans-serif-condensed</string>
    <string name="font_family_black">sans-serif-black</string>
    <string name="font_family_thin">sans-serif-thin</string>
</resources>

Combination

除了单独使用外,textStyle 和 fontFamily 还能够组合使用

• Roboto regular
• Roboto italic
• Roboto bold
• Roboto bold italic
• Roboto-Light
• Roboto-Light italic
• Roboto-Thin
• Roboto-Thin italic
• Roboto-Condensed
• Roboto-Condensed italic
• Roboto-Condensed bold
• Roboto-Condensed bold italic
• Roboto-Black
• Roboto-Black italic
• Roboto-Medium
• Roboto-Medium italic

In Java

setTypeface

在 Java 文件中可以通过 setTypeface 来实现上述标签的效果

textView.setTypeface(typeface);

//Typeface.java

public class Typeface {

    //.......

    /** The default NORMAL typeface object */
    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;

    //.......

}

创建 Typeface

#1

Typeface typeface = Typeface.create("sans-serif-medium",Typeface.NORMAL)

#2

//Android 4.1 (API Level 16) and Support Library 26 and higher
Typefeace typeface = ResourcesCompat.getFont(Context, R.font.YOUR_FONT)

#3

Typeface typeface = Typeface.createFromAsset(getAssets(),"fonts/mycustomfont.ttf"); 

setTextAppearance

<style name="styleA">
    <item name="android:fontFamily">sans-serif</item>
    <item name="android:textStyle">bold</item>
    <item name="android:textColor">?android:attr/textColorPrimary</item>
</style>
<style name="styleB">
    <item name="android:fontFamily">sans-serif-light</item>
    <item name="android:textStyle">normal</item>
    <item name="android:textColor">?android:attr/textColorTertiary</item>
</style>

if(condition){
    textView.setTextAppearance(context,R.style.styleA);
}else{
    textView.setTextAppearance(context,R.style.styleB);
}