我在我的应用程序中使用Roboto light字体。要设置字体，我必须添加android:fontFamily="sans-serif-light"到每个视图。有什么方法来声明Roboto字体作为默认字体家族整个应用程序?我试过这样做，但似乎不管用。
<style name="AppBaseTheme" parent="android:Theme.Light"></style>
<style name="AppTheme" parent="AppBaseTheme">
<item name="android:fontFamily">sans-serif-light</item>
</style>
当前回答
这是我的项目的工作，来源https://gist.github.com/artem-zinnatullin/7749076
在资产文件夹内创建字体目录，然后复制您的自定义字体到字体目录，例如我使用trebuchet.ttf;
创建一个类TypefaceUtil.java;
import android.content.Context;
import android.graphics.Typeface;
import android.util.Log;
import java.lang.reflect.Field;
public class TypefaceUtil {
public static void overrideFont(Context context, String defaultFontNameToOverride, String customFontFileNameInAssets) {
try {
final Typeface customFontTypeface = Typeface.createFromAsset(context.getAssets(), customFontFileNameInAssets);
final Field defaultFontTypefaceField = Typeface.class.getDeclaredField(defaultFontNameToOverride);
defaultFontTypefaceField.setAccessible(true);
defaultFontTypefaceField.set(null, customFontTypeface);
} catch (Exception e) {
}
}
}
在styles.xml中编辑主题
<item name="android:typeface">serif</item>
My styles.xml中的示例
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
<item name="android:typeface">serif</item><!-- Add here -->
</style>
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
<item name="android:windowActionBarOverlay">true</item>
<item name="android:windowFullscreen">true</item>
</style>
</resources>
最后，在Activity或Fragment中onCreate调用TypefaceUtil.java
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TypefaceUtil.overrideFont(getContext(), "SERIF", "fonts/trebuchet.ttf");
}
其他回答
另一种方法是在整个应用程序中使用基于这个答案的反射
public class TypefaceUtil {
/**
* Using reflection to override default typefaces
* NOTICE: DO NOT FORGET TO SET TYPEFACE FOR APP THEME AS DEFAULT TYPEFACE WHICH WILL BE
* OVERRIDDEN
*
* @param typefaces map of fonts to replace
*/
public static void overrideFonts(Map<String, Typeface> typefaces) {
try {
final Field field = Typeface.class.getDeclaredField("sSystemFontMap");
field.setAccessible(true);
Map<String, Typeface> oldFonts = (Map<String, Typeface>) field.get(null);
if (oldFonts != null) {
oldFonts.putAll(typefaces);
} else {
oldFonts = typefaces;
}
field.set(null, oldFonts);
field.setAccessible(false);
} catch (Exception e) {
Log.e("TypefaceUtil", "Can not set custom fonts");
}
}
public static Typeface getTypeface(int fontType, Context context) {
// here you can load the Typeface from asset or use default ones
switch (fontType) {
case BOLD:
return Typeface.create(SANS_SERIF, Typeface.BOLD);
case ITALIC:
return Typeface.create(SANS_SERIF, Typeface.ITALIC);
case BOLD_ITALIC:
return Typeface.create(SANS_SERIF, Typeface.BOLD_ITALIC);
case LIGHT:
return Typeface.create(SANS_SERIF_LIGHT, Typeface.NORMAL);
case CONDENSED:
return Typeface.create(SANS_SERIF_CONDENSED, Typeface.NORMAL);
case THIN:
return Typeface.create(SANS_SERIF_MEDIUM, Typeface.NORMAL);
case MEDIUM:
return Typeface.create(SANS_SERIF_THIN, Typeface.NORMAL);
case REGULAR:
default:
return Typeface.create(SANS_SERIF, Typeface.NORMAL);
}
}
}
然后当你想重写字体时，你可以调用这个方法并给它一个字体映射，如下所示:
Typeface regular = TypefaceUtil.getTypeface(REGULAR, context);
Typeface light = TypefaceUtil.getTypeface(REGULAR, context);
Typeface condensed = TypefaceUtil.getTypeface(CONDENSED, context);
Typeface thin = TypefaceUtil.getTypeface(THIN, context);
Typeface medium = TypefaceUtil.getTypeface(MEDIUM, context);
Map<String, Typeface> fonts = new HashMap<>();
fonts.put("sans-serif", regular);
fonts.put("sans-serif-light", light);
fonts.put("sans-serif-condensed", condensed);
fonts.put("sans-serif-thin", thin);
fonts.put("sans-serif-medium", medium);
TypefaceUtil.overrideFonts(fonts);
完整的示例检查
这只适用于Android SDK 21及以上的早期版本，检查完整的示例
将这行代码添加到res/value/styles.xml中
<item name="android:fontFamily">@font/circular_medium</item>
整个样式看起来就像这样
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
<item name="android:fontFamily">@font/circular_medium</item>
</style>
将“circular_medium”更改为您自己的字体名称。
我们是这样做的:
private static void OverrideDefaultFont(string defaultFontNameToOverride, string customFontFileNameInAssets, AssetManager assets)
{
//Load custom Font from File
Typeface customFontTypeface = Typeface.CreateFromAsset(assets, customFontFileNameInAssets);
//Get Fontface.Default Field by reflection
Class typeFaceClass = Class.ForName("android.graphics.Typeface");
Field defaultFontTypefaceField = typeFaceClass.GetField(defaultFontNameToOverride);
defaultFontTypefaceField.Accessible = true;
defaultFontTypefaceField.Set(null, customFontTypeface);
}
只需使用这个库编译在你的成绩文件
complie'me.anwarshahriar:calligrapher:1.0'
并在主活动的onCreate方法中使用它
Calligrapher calligrapher = new Calligrapher(this);
calligrapher.setFont(this, "yourCustomFontHere.ttf", true);
这是最优雅快捷的方法。
随着Android Oreo的发布，您可以使用支持库来实现这一目标。
签入你的应用构建。Gradle，如果你有支持库>= 26.0.0 添加"font"文件夹到你的资源文件夹，并添加你的字体 在你的应用程序主样式中引用你的默认字体家族: <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar"> <项目名称= " android: fontFamily " > @font / your_font > < /项目 <item name="fontFamily">@font/your_font</item> <!——目标android sdk版本< 26和> 14如果主题不是AppCompat——> > < /风格
更多详细信息请访问https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml.html。
