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Android 修改字体样式，看这篇就够了

来源：花匠小妙招时间：2024-12-26 14:34

Android 默认字体为「思源黑体」，英文名：Noto Sans

1.单独设置字体样式

（1）Android系统提供了几种字体样式可供选择

通过设置typeface属性或者fontFamily属性设置
typeface属性：

normalserifsansmonospace

fontFamily属性：

casualcursiveserifmonospacesans-serifsans-serif-condensedserif-monospacesans-serif-smallcaps

※typeface和fontFamily区别

android:typeface属性是增加API1
android:fontFamily在API16（4.1）中添加了属性

※当同时设置typeface和fontFamily时，只有fontFamily生效

查看一波TextView的源码

private void setTypefaceFromAttrs(String familyName, int typefaceIndex, int styleIndex) {

Typeface tf = null;

if (familyName != null) {

tf = Typeface.create(familyName, styleIndex);

if (tf != null) {

setTypeface(tf);

return;

}

switch (typefaceIndex) {

case SANS:

tf = Typeface.SANS_SERIF;

break;

case SERIF:

tf = Typeface.SERIF;

break;

case MONOSPACE:

tf = Typeface.MONOSPACE;

break;

}

setTypeface(tf, styleIndex);

}

从方法setTypefaceFromAttrs()看，如果你有set fontFamily属性，那么typefaceattribute将被忽略。

这边会发现这样设置typeface和fontFamily属性对中文不生效，这时候就需要引用外部的字体样式（这里谷歌设计规范推荐使用NOTO字体https://www.google.com/get/noto/）

2）使用字体样式文件设置(otf，ttf文件都可以)

在assets下新建一个fonts文件，把字体样式文件放进去

在代码中设置

AssetManager mgr = getAssets();

Typeface tf = Typeface.createFromAsset(mgr, "fonts/NotoSansCJKsc-Black.otf");

tv_1.setTypeface(tf);

2.批量设置字体样式

（1）自定义TextView

public class CustomTextView extends TextView

{

public CustomTextView(Context context, AttributeSet attrs)

{

super(context, attrs);

}

@Override

public void setTypeface(Typeface tf)

{

tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/NotoSansCJKsc-Light.otf");

super.setTypeface(tf);

}

之后在XML布局文件中使用CustomTextView代替TextView

<com.test.fontfamily.CustomTextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="6dp"

android:text="自定义字体"

android:textSize="24dp"

（2）更换整个App的字体

思路：遍历找到所有的TextView然后替换字体
百度了一下找到下面工具类

package com.test.fontfamily;

import android.app.Application;

import android.content.Context;

import android.graphics.Typeface;

import android.support.annotation.NonNull;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import java.lang.ref.SoftReference;

import java.lang.reflect.Field;

import java.util.HashMap;

import java.util.Map;

public class FontUtils

{

private static final String TAG = FontUtils.class.getSimpleName();

private Map<String, SoftReference<Typeface>> mCache = new HashMap<>();

private static FontUtils sSingleton = null;

public static Typeface DEFAULT = Typeface.DEFAULT;

private FontUtils()

{

}

public static FontUtils getInstance()

{

if (sSingleton == null)

{

synchronized (FontUtils.class)

{

if (sSingleton == null)

{

sSingleton = new FontUtils();

}

return sSingleton;

}

public void replaceFontFromAsset(@NonNull View root, @NonNull String fontPath)

{

replaceFont(root, createTypefaceFromAsset(root.getContext(), fontPath));

}

public void replaceFontFromAsset(@NonNull View root, @NonNull String fontPath, int style)

{

replaceFont(root, createTypefaceFromAsset(root.getContext(), fontPath), style);

}

public void replaceFontFromFile(@NonNull View root, @NonNull String fontPath)

{

replaceFont(root, createTypefaceFromFile(fontPath));

}

public void replaceFontFromFile(@NonNull View root, @NonNull String fontPath, int style)

{

replaceFont(root, createTypefaceFromFile(fontPath), style);

}

private void replaceFont(@NonNull View root, @NonNull Typeface typeface)

{

if (root == null || typeface == null)

{

return;

}

if (root instanceof TextView)

{

TextView textView = (TextView) root;

int style = Typeface.NORMAL;

if (textView.getTypeface() != null)

{

style = textView.getTypeface().getStyle();

}

textView.setTypeface(typeface, style);

} else if (root instanceof ViewGroup)

{

ViewGroup viewGroup = (ViewGroup) root;

for (int i = 0; i < viewGroup.getChildCount(); ++i)

{

replaceFont(viewGroup.getChildAt(i), typeface);

}

private void replaceFont(@NonNull View root, @NonNull Typeface typeface, int style)

{

if (root == null || typeface == null)

{

return;

}

if (style < 0 || style > 3)

{

style = Typeface.NORMAL;

}

if (root instanceof TextView)

{

TextView textView = (TextView) root;

textView.setTypeface(typeface, style);

} else if (root instanceof ViewGroup)

{

ViewGroup viewGroup = (ViewGroup) root;

for (int i = 0; i < viewGroup.getChildCount(); ++i)

{

replaceFont(viewGroup.getChildAt(i), typeface, style);

}

private Typeface createTypefaceFromAsset(Context context, String fontPath)

{

SoftReference<Typeface> typefaceRef = mCache.get(fontPath);

Typeface typeface = null;

if (typefaceRef == null || (typeface = typefaceRef.get()) == null)

{

typeface = Typeface.createFromAsset(context.getAssets(), fontPath);

typefaceRef = new SoftReference<>(typeface);

mCache.put(fontPath, typefaceRef);

}

return typeface;

}

private Typeface createTypefaceFromFile(String fontPath)

{

SoftReference<Typeface> typefaceRef = mCache.get(fontPath);

Typeface typeface = null;

if (typefaceRef == null || (typeface = typefaceRef.get()) == null)

{

typeface = Typeface.createFromFile(fontPath);

typefaceRef = new SoftReference<>(typeface);

mCache.put(fontPath, typefaceRef);

}

return typeface;

}

public void replaceSystemDefaultFontFromAsset(@NonNull Context context, @NonNull String fontPath)

{

replaceSystemDefaultFont(createTypefaceFromAsset(context, fontPath));

}

public void replaceSystemDefaultFontFromFile(@NonNull Context context, @NonNull String fontPath)

{

replaceSystemDefaultFont(createTypefaceFromFile(fontPath));

}

private void replaceSystemDefaultFont(@NonNull Typeface typeface)

{

modifyObjectField(null, "MONOSPACE", typeface);

}

private void modifyObjectField(Object obj, String fieldName, Object value)

{

try

{

Field defaultField = Typeface.class.getDeclaredField(fieldName);

defaultField.setAccessible(true);

defaultField.set(obj, value);

} catch (NoSuchFieldException e)

{

e.printStackTrace();

} catch (IllegalAccessException e)

{

e.printStackTrace();

}

阅读源码发现这里面主要方法有

replaceFont()

替换一个页面中的所有字体
用递归的方式去查找view是否是TextView或者TextView的子类，然后进行替换
不过这种方法效率不高
用法：
在页面中
FontUtils.getInstance().replaceFontFromAsset(View root, String fontPath)

modifyObjectField()

替换App所有字体
利用反射替换系统默认字体
用法：
a.新建一个BaseApplication继承Application在onCreate方法中
FontUtils.getInstance().replaceSystemDefaultFontFromAsset(this,"fonts/NotoSansCJKsc-Thin.otf");
b.在AppTheme中添加
<item name="android:typeface">monospace</item>
c.清单文件中使用BaseApplication