Android修改字体样式的示例代码

在Android实际开发中根据UI的设计图，经常要去改变系统默认的字体样式

这样做会使apk变大很多啊

而且为什么android要使用ios的字体-_-#

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：

normal
serif
sans
monospace

fontFamily属性：

casual
cursive
serif
monospace
sans-serif
sans-serif-condensed
serif-monospace
sans-serif-smallcaps

Android修改字体样式的示例代码_第1张图片

※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);

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);  }  //重写设置字体方法  @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

Android修改字体样式的示例代码_第2张图片

（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;/** * Created by Administrator on 2017/10/24. */public class FontUtils{  private static final String TAG = FontUtils.class.getSimpleName();  private Map> mCache = new HashMap<>();  private static FontUtils sSingleton = null;  public static Typeface DEFAULT = Typeface.DEFAULT;  // disable instantiate  private FontUtils()  {  }  public static FontUtils getInstance()  {    // double check    if (sSingleton == null)    {      synchronized (FontUtils.class)      {        if (sSingleton == null)        {          sSingleton = new FontUtils();        }      }    }    return sSingleton;  }  /**   * Replace the font of specified view and it's children
   *   * @param root   The root view.   * @param fontPath font file path relative to 'assets' directory.   */  public void replaceFontFromAsset(@NonNull View root, @NonNull String fontPath)  {    replaceFont(root, createTypefaceFromAsset(root.getContext(), fontPath));  }  /**   * Replace the font of specified view and it's children
   *   * @param root   The root view.   * @param fontPath font file path relative to 'assets' directory.   * @param style  One of {@link Typeface#NORMAL}, {@link Typeface#BOLD}, {@link Typeface#ITALIC}, {@link Typeface#BOLD_ITALIC}   */  public void replaceFontFromAsset(@NonNull View root, @NonNull String fontPath, int style)  {    replaceFont(root, createTypefaceFromAsset(root.getContext(), fontPath), style);  }  /**   * Replace the font of specified view and it's children
   *   * @param root   The root view.   * @param fontPath The full path to the font data.   */  public void replaceFontFromFile(@NonNull View root, @NonNull String fontPath)  {    replaceFont(root, createTypefaceFromFile(fontPath));  }  /**   * Replace the font of specified view and it's children
   *   * @param root   The root view.   * @param fontPath The full path to the font data.   * @param style  One of {@link Typeface#NORMAL}, {@link Typeface#BOLD}, {@link Typeface#ITALIC}, {@link Typeface#BOLD_ITALIC}   */  public void replaceFontFromFile(@NonNull View root, @NonNull String fontPath, int style)  {    replaceFont(root, createTypefaceFromFile(fontPath), style);  }  /**   * Replace the font of specified view and it's children with specified typeface
   */  private void replaceFont(@NonNull View root, @NonNull Typeface typeface)  {    if (root == null || typeface == null)    {      return;    }    if (root instanceof TextView)    { // If view is TextView or it's subclass, replace it's font      TextView textView = (TextView) root;      // Extract previous style of TextView      int style = Typeface.NORMAL;      if (textView.getTypeface() != null)      {        style = textView.getTypeface().getStyle();      }      textView.setTypeface(typeface, style);    } else if (root instanceof ViewGroup)    { // If view is ViewGroup, apply this method on it's child views      ViewGroup viewGroup = (ViewGroup) root;      for (int i = 0; i < viewGroup.getChildCount(); ++i)      {        replaceFont(viewGroup.getChildAt(i), typeface);      }    } // else return  }  /**   * Replace the font of specified view and it's children with specified typeface and text style
   *   * @param style One of {@link Typeface#NORMAL}, {@link Typeface#BOLD}, {@link Typeface#ITALIC}, {@link Typeface#BOLD_ITALIC}   */  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)    { // If view is TextView or it's subclass, replace it's font      TextView textView = (TextView) root;      textView.setTypeface(typeface, style);    } else if (root instanceof ViewGroup)    { // If view is ViewGroup, apply this method on it's child views      ViewGroup viewGroup = (ViewGroup) root;      for (int i = 0; i < viewGroup.getChildCount(); ++i)      {        replaceFont(viewGroup.getChildAt(i), typeface, style);      }    } // else return  }  /**   * Create a Typeface instance with specified font file
   *   * @param fontPath font file path relative to 'assets' directory.   * @return Return created typeface instance.   */  private Typeface createTypefaceFromAsset(Context context, String fontPath)  {    SoftReference 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 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;  }  /**   * Replace system default font. Note:you should also add code below to your app theme in styles.xml. 
   * {@code monospace}   * The best place to call this method is {@link Application#onCreate()}, it will affect   * whole app font.If you call this method after view is visible, you need to invalid the view to make it effective.
   *   * @param context {@link Context Context}   * @param fontPath font file path relative to 'assets' directory.   */  public void replaceSystemDefaultFontFromAsset(@NonNull Context context, @NonNull String fontPath)  {    replaceSystemDefaultFont(createTypefaceFromAsset(context, fontPath));  }  /**   * Replace system default font. Note:you should also add code below to your app theme in styles.xml. 
   * {@code monospace}   * The best place to call this method is {@link Application#onCreate()}, it will affect   * whole app font.If you call this method after view is visible, you need to invalid the view to make it effective.
   *   * @param context {@link Context Context}   * @param fontPath The full path to the font data.   */  public void replaceSystemDefaultFontFromFile(@NonNull Context context, @NonNull String fontPath)  {    replaceSystemDefaultFont(createTypefaceFromFile(fontPath));  }  /**   * Replace system default font. Note:you should also add code below to your app theme in styles.xml. 
   * {@code monospace}   * The best place to call this method is {@link Application#onCreate()}, it will affect   * whole app font.If you call this method after view is visible, you need to invalid the view to make it effective.
   */  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

monospace

c.清单文件中使用BaseApplication

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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