blocks|key|323035|text|对整个应用程序执行此操作的另一种方法是使用基于此answer的反射|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|323036|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);
++++++++}
++++}
}|code-block|syntax|javascript|323037|然后，当你想覆盖字体的时候，你可以只调用这个方法，并给它一个字体的映射，如下所示：|323038|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);|323039|完整的示例check|323040|这只适用于Android+SDK+21和更高版本，对于较早版本，请查看完整示例|323041|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/2973270/using-a-custom-typeface-in-android/16275257#16275257|1|https://gist.github.com/ialmetwally/fc57f7766ee6ab07ff52^0|O|6|0|0|0|0|0|5|5|1|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|15|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|16|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|17|8|@]|9|@$A|18|B|19|1|1A]]|C|$]]|$1|O|3|P|5|6|7|1B|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|T|U|V|C|$W|Z]]]]

Another way to do this for the whole app is using reflection based on this <a href="https://stackoverflow.com/questions/2973270/using-a-custom-typeface-in-android/16275257#16275257">answer</a> 

<pre><code>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&lt;String, Typeface&gt; typefaces) {
 try {
 final Field field = Typeface.class.getDeclaredField("sSystemFontMap");
 field.setAccessible(true);
 Map&lt;String, Typeface&gt; oldFonts = (Map&lt;String, Typeface&gt;) 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);
 }
 }
}
</code></pre>

then whenever you want to override the fonts you can just call the method and give it a map of typefaces as follows:

<pre><code>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&lt;String, Typeface&gt; fonts = new HashMap&lt;&gt;();
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);
</code></pre>

for full example <a href="https://gist.github.com/ialmetwally/fc57f7766ee6ab07ff52" rel="nofollow noreferrer">check</a> 

This only works for Android SDK 21 and above for earlier versions check the full example

blocks|key|106017|text|不谈性能，对于自定义字体，你可以使用递归方法循环遍历所有视图，如果是TextView，则设置typeface：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|106018|public+class+Font+{
++++public+static+void+setAllTextView(ViewGroup+parent)+{
++++++++for+(int+i+=+parent.getChildCount()+-+1;+i+>=+0;+i--)+{
++++++++++++final+View+child+=+parent.getChildAt(i);
++++++++++++if+(child+instanceof+ViewGroup)+{
++++++++++++++++setAllTextView((ViewGroup)+child);
++++++++++++}+else+if+(child+instanceof+TextView)+{
++++++++++++++++((TextView)+child).setTypeface(getFont());
++++++++++++}
++++++++}
++++}

++++public+static+Typeface+getFont()+{
++++++++return+Typeface.createFromAsset(YourApplicationContext.getInstance().getAssets(),+"fonts/whateverfont.ttf");
++++}
}|code-block|syntax|javascript|106019|在您的所有活动中，在setContentView之后将当前的ViewGroup传递给它，它就完成了：|106020|ViewGroup+group+=+(ViewGroup)+getWindow().getDecorView().findViewById(android.R.id.content);
Font.setAllTextView(group);|106021|对于fragment，您可以执行类似的操作。|106022|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Not talk about performance, for custom font you can have a recursive method loop through all the views and set typeface if it's a TextView:

<pre><code>public class Font {
 public static void setAllTextView(ViewGroup parent) {
 for (int i = parent.getChildCount() - 1; i &gt;= 0; i--) {
 final View child = parent.getChildAt(i);
 if (child instanceof ViewGroup) {
 setAllTextView((ViewGroup) child);
 } else if (child instanceof TextView) {
 ((TextView) child).setTypeface(getFont());
 }
 }
 }

 public static Typeface getFont() {
 return Typeface.createFromAsset(YourApplicationContext.getInstance().getAssets(), "fonts/whateverfont.ttf");
 }
}
</code></pre>

In all your activity, pass current ViewGroup to it after setContentView and it's done:

<pre><code>ViewGroup group = (ViewGroup) getWindow().getDecorView().findViewById(android.R.id.content);
Font.setAllTextView(group);
</code></pre>

For fragment you can do something similar.

blocks|key|106099|text|我知道这个问题很古老，但我找到了一个很好的解决方案。基本上，您将容器布局传递给此函数，它会将字体应用于所有支持的视图，并递归地应用于子布局中的循环：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|106100|public+static+void+setFont(ViewGroup+layout)
{
++++final+int+childcount+=+layout.getChildCount();
++++for+(int+i+=+0;+i+<+childcount;+i%2B%2B)
++++{
++++++++//+Get+the+view
++++++++View+v+=+layout.getChildAt(i);

++++++++//+Apply+the+font+to+a+possible+TextView
++++++++try+{
++++++++++++((TextView)+v).setTypeface(MY_CUSTOM_FONT);
++++++++++++continue;
++++++++}
++++++++catch+(Exception+e)+{+}

++++++++//+Apply+the+font+to+a+possible+EditText
++++++++try+{
++++++++++++((TextView)+v).setTypeface(MY_CUSTOM_FONT);
++++++++++++continue;
++++++++}
++++++++catch+(Exception+e)+{+}

++++++++//+Recursively+cicle+into+a+possible+child+layout
++++++++try+{
++++++++++++ViewGroup+vg+=+(ViewGroup)+v;
++++++++++++Utility.setFont(vg);
++++++++++++continue;
++++++++}
++++++++catch+(Exception+e)+{+}
++++}
}|code-block|syntax|javascript|106101|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I know this question is quite old, but I have found a nice solution.
Basically, you pass a container layout to this function, and it will apply the font to all supported views, and recursively cicle in child layouts:

<pre><code>public static void setFont(ViewGroup layout)
{
 final int childcount = layout.getChildCount();
 for (int i = 0; i &lt; childcount; i++)
 {
 // Get the view
 View v = layout.getChildAt(i);

 // Apply the font to a possible TextView
 try {
 ((TextView) v).setTypeface(MY_CUSTOM_FONT);
 continue;
 }
 catch (Exception e) { }

 // Apply the font to a possible EditText
 try {
 ((TextView) v).setTypeface(MY_CUSTOM_FONT);
 continue;
 }
 catch (Exception e) { }

 // Recursively cicle into a possible child layout
 try {
 ViewGroup vg = (ViewGroup) v;
 Utility.setFont(vg);
 continue;
 }
 catch (Exception e) { }
 }
}
</code></pre>

blocks|key|106142|text|试试这个库，它轻量级且易于实现。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|106143|https://github.com/sunnag7/FontStyler|offset|length|106144|<com.sunnag.fontstyler.FontStylerView
++++++++++++++android:textStyle="bold"
++++++++++++++android:text="@string/about_us"
++++++++++++++android:layout_width="match_parent"
++++++++++++++android:layout_height="match_parent"
++++++++++++++android:paddingTop="8dp"
++++++++++++++app:fontName="Lato-Bold"
++++++++++++++android:textSize="18sp"
++++++++++++++android:id="@%2Bid/textView64"+/>|code-block|syntax|javascript|106145|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|11|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@$D|T|E|U|1|V]]|A|$]]|$1|F|3|G|5|H|7|W|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|C]]]]

Try this library, its lightweight and easy to implement

<a href="https://github.com/sunnag7/FontStyler" rel="nofollow noreferrer">https://github.com/sunnag7/FontStyler</a>

<pre><code>&lt;com.sunnag.fontstyler.FontStylerView
 android:textStyle="bold"
 android:text="@string/about_us"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingTop="8dp"
 app:fontName="Lato-Bold"
 android:textSize="18sp"
 android:id="@+id/textView64" /&gt;
</code></pre>

blocks|key|323240|text|只要使用这个库，就可以在你的成绩文件中编译它|type|unstyled|depth|inlineStyleRanges|entityRanges|data|323241|complie'me.anwarshahriar:calligrapher:1.0'|code-block|syntax|javascript|323242|并在main活动的onCreate方法中使用它|323243|Calligrapher+calligrapher+=+new+Calligrapher(this);
calligrapher.setFont(this,+"yourCustomFontHere.ttf",+true);|323244|这是做到这一点的最优雅的超级快速方法。|323245|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Just use this lib compile it in your grade file 

<pre><code>complie'me.anwarshahriar:calligrapher:1.0'
</code></pre>

and use it in the onCreate method in the main activity 

<pre><code>Calligrapher calligrapher = new Calligrapher(this);
calligrapher.setFont(this, "yourCustomFontHere.ttf", true);
</code></pre>

This is the most elegant super fast way to do that.

blocks|key|323279|text|这是为我的项目工作，源https://gist.github.com/artem-zinnatullin/7749076|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|323280|在资产文件夹中创建字体目录，然后将您的自定义字体复制到字体目录中，例如我使用trebuchet.ttf；|323281|创建一个类TypefaceUtil.java；|323282|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)+{

++++++++}
++++}
}|code-block|syntax|javascript|323283|在下面添加的styles.xml中编辑主题|323284|<item+name="android:typeface">serif</item>|323285|我的styles.xml中的示例|323286|<resources>

++++
++++<style+name="AppTheme"+parent="Theme.AppCompat.Light.DarkActionBar">
++++++++
++++++++<item+name="colorPrimary">@color/colorPrimary</item>
++++++++<item+name="colorPrimaryDark">@color/colorPrimaryDark</item>
++++++++<item+name="colorAccent">@color/colorAccent</item>
++++++++<item+name="android:typeface">serif</item>
++++</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>|323287|最后，在活动或片段onCreate中调用TypefaceUtil.java|323288|@Override
++++public+void+onCreate(Bundle+savedInstanceState)+{
++++++++super.onCreate(savedInstanceState);
++++++++TypefaceUtil.overrideFont(getContext(),+"SERIF",+"fonts/trebuchet.ttf");
++++}|323289|entityMap|0|LINK|mutability|MUTABLE|url|https://gist.github.com/artem-zinnatullin/7749076^0|B|1D|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]]|C|$]]|$1|D|3|E|5|6|7|1A|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|1B|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|1C|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|1D|8|@]|9|@]|C|$]]|$1|O|3|P|5|J|7|1E|8|@]|9|@]|C|$K|L]]|$1|Q|3|R|5|6|7|1F|8|@]|9|@]|C|$]]|$1|S|3|T|5|J|7|1G|8|@]|9|@]|C|$K|L]]|$1|U|3|V|5|6|7|1H|8|@]|9|@]|C|$]]|$1|W|3|X|5|J|7|1I|8|@]|9|@]|C|$K|L]]|$1|Y|3|-4|5|6|7|1J|8|@]|9|@]|C|$]]]|Z|$10|$5|11|12|13|C|$14|15]]]]

This is work for my project, source <a href="https://gist.github.com/artem-zinnatullin/7749076" rel="nofollow noreferrer">https://gist.github.com/artem-zinnatullin/7749076</a>

Create fonts directory inside Asset Folder and then copy your custom font to fonts directory, example I am using trebuchet.ttf;

Create a class TypefaceUtil.java;

<pre><code>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) {

 }
 }
}
</code></pre>

Edit theme in styles.xml add below

<pre><code>&lt;item name="android:typeface"&gt;serif&lt;/item&gt;
</code></pre>

Example in My styles.xml

<pre><code>&lt;resources&gt;

 &lt;!-- Base application theme. --&gt;
 &lt;style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"&gt;
 &lt;!-- Customize your theme here. --&gt;
 &lt;item name="colorPrimary"&gt;@color/colorPrimary&lt;/item&gt;
 &lt;item name="colorPrimaryDark"&gt;@color/colorPrimaryDark&lt;/item&gt;
 &lt;item name="colorAccent"&gt;@color/colorAccent&lt;/item&gt;
 &lt;item name="android:typeface"&gt;serif&lt;/item&gt;&lt;!-- Add here --&gt;
 &lt;/style&gt;


 &lt;style name="AppTheme.NoActionBar"&gt;
 &lt;item name="windowActionBar"&gt;false&lt;/item&gt;
 &lt;item name="windowNoTitle"&gt;true&lt;/item&gt;
 &lt;item name="android:windowActionBarOverlay"&gt;true&lt;/item&gt;
 &lt;item name="android:windowFullscreen"&gt;true&lt;/item&gt;
 &lt;/style&gt;
&lt;/resources&gt;
</code></pre>

Finally, in Activity or Fragment onCreate call TypefaceUtil.java

<pre><code>@Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 TypefaceUtil.overrideFont(getContext(), "SERIF", "fonts/trebuchet.ttf");
 }
</code></pre>

blocks|key|106276|text|在res/value/styles.xml中添加以下代码行|type|unstyled|depth|inlineStyleRanges|entityRanges|data|106277|<item+name="android:fontFamily">@font/circular_medium</item>|code-block|syntax|javascript|106278|整个样式看起来就像这样|106279|<style+name="AppTheme"+parent="Theme.AppCompat.Light.DarkActionBar">
++++
++++<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>|106280|将"circular_medium“更改为您自己的字体名称..|106281|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Add this line of code in your res/value/styles.xml

<pre><code>&lt;item name="android:fontFamily"&gt;@font/circular_medium&lt;/item&gt;
</code></pre>

the entire style will look like that

<pre><code>&lt;style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"&gt;
 &lt;!-- Customize your theme here. --&gt;
 &lt;item name="colorPrimary"&gt;@color/colorPrimary&lt;/item&gt;
 &lt;item name="colorPrimaryDark"&gt;@color/colorPrimaryDark&lt;/item&gt;
 &lt;item name="colorAccent"&gt;@color/colorAccent&lt;/item&gt;
 &lt;item name="android:fontFamily"&gt;@font/circular_medium&lt;/item&gt;
&lt;/style&gt;
</code></pre>

change "circular_medium" to your own font name..

blocks|key|323341|text|我们是这样做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|323342|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);
}|code-block|syntax|javascript|323343|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is how we do it:
<pre><code>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(&quot;android.graphics.Typeface&quot;);
 Field defaultFontTypefaceField = typeFaceClass.GetField(defaultFontNameToOverride);

 defaultFontTypefaceField.Accessible = true;
 defaultFontTypefaceField.Set(null, customFontTypeface);
}
</code></pre>

I'm using the Roboto light font in my app. To set the font I've to add the <code>android:fontFamily="sans-serif-light"</code> to every view. Is there any way to declare the Roboto font as default font family to entire app? I've tried like this but it didn't seem to work.

<pre><code>&lt;style name="AppBaseTheme" parent="android:Theme.Light"&gt;&lt;/style&gt;

&lt;style name="AppTheme" parent="AppBaseTheme"&gt;
 &lt;item name="android:fontFamily"&gt;sans-serif-light&lt;/item&gt;
&lt;/style&gt;
</code></pre>

How to set default font family for entire Android app

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我在我的应用程序中使用了Roboto light字体。要设置字体，我必须将android:fontFamily="sans-serif-light"添加到每个视图。有没有办法将Roboto字体声明为整个应用程序的默认字体系列？我试过这样做，但似乎不起作用。<style name="AppBaseTheme" paren...

问如何为整个Android应用程序设置默认字体系列
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