blocks|key|5306871|text|使用自定义字体的唯一方法是通过源代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5306872|请记住，Android运行在资源非常有限的设备上，字体可能需要大量的RAM。内置的Droid字体是特制的，如果你注意到的话，里面少了很多字符和装饰物。|5306873|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

The only way to use custom fonts is through the source code.

Just remember that Android runs on devices with very limited resources and fonts might require a good amount of RAM. The built-in Droid fonts are specially made and, if you note, have many characters and decorations missing.

blocks|key|1778825|text|扩展TextView并给它一个自定义属性，或者只使用android:tag属性来传入您想要使用的字体的字符串。您需要选择一个约定并遵守它，比如我会将我所有的字体放在res/assets/+fonts+/文件夹中，这样您的TextView类就知道在哪里可以找到它们。然后在你的构造函数中，你只需在超级调用之后手动设置字体即可。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1778826|entityMap^0|2|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Extend <code>TextView</code> and give it a custom attribute or just use the android:tag attribute to pass in a String of what font you want to use. You will need to pick a convention and stick to it such as I will put all of my fonts in the res/assets/fonts/ folder so your TextView class knows where to find them. Then in your constructor you just set the font manually after the super call.

blocks|key|5306920|text|不能扩展TextView以创建小部件或在小部件布局中使用小部件：http://developer.android.com/guide/topics/appwidgets/index.html|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5306921|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/guide/topics/appwidgets/index.html^0|W|1R|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You can't extend TextView to create a widget or use one in a widgets layout:
<a href="http://developer.android.com/guide/topics/appwidgets/index.html" rel="nofollow">http://developer.android.com/guide/topics/appwidgets/index.html</a>

blocks|key|5306938|text|正如我学到的here一样，您可以扩展TextView来设置自定义字体。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5306939|TextViewPlus.java:|style|BOLD|5306940|package+com.example;

import+android.content.Context;
import+android.content.res.TypedArray;
import+android.graphics.Typeface;
import+android.util.AttributeSet;
import+android.util.Log;
import+android.widget.TextView;

public+class+TextViewPlus+extends+TextView+{
++++private+static+final+String+TAG+=+"TextView";

++++public+TextViewPlus(Context+context)+{
++++++++super(context);
++++}

++++public+TextViewPlus(Context+context,+AttributeSet+attrs)+{
++++++++super(context,+attrs);
++++++++setCustomFont(context,+attrs);
++++}

++++public+TextViewPlus(Context+context,+AttributeSet+attrs,+int+defStyle)+{
++++++++super(context,+attrs,+defStyle);
++++++++setCustomFont(context,+attrs);
++++}

++++private+void+setCustomFont(Context+ctx,+AttributeSet+attrs)+{
++++++++TypedArray+a+=+ctx.obtainStyledAttributes(attrs,+R.styleable.TextViewPlus);
++++++++String+customFont+=+a.getString(R.styleable.TextViewPlus_customFont);
++++++++setCustomFont(ctx,+customFont);
++++++++a.recycle();
++++}

++++public+boolean+setCustomFont(Context+ctx,+String+asset)+{
++++++++Typeface+tf+=+null;
++++++++try+{
++++++++tf+=+Typeface.createFromAsset(ctx.getAssets(),+asset);++
++++++++}+catch+(Exception+e)+{
++++++++++++Log.e(TAG,+"Could+not+get+typeface:+"%2Be.getMessage());
++++++++++++return+false;
++++++++}

++++++++setTypeface(tf);++
++++++++return+true;
++++}

}|code-block|syntax|javascript|5306941|attrs.xml:+(分辨率/值)|5306942|<?xml+version="1.0"+encoding="utf-8"?>
<resources>
++++<declare-styleable+name="TextViewPlus">
++++++++<attr+name="customFont"+format="string"/>
++++</declare-styleable>
</resources>|5306943|main.xml:|5306944|<?xml+version="1.0"+encoding="utf-8"?>
<LinearLayout+
++++xmlns:android="http://schemas.android.com/apk/res/android"
++++xmlns:foo="http://schemas.android.com/apk/res/com.example"
++++android:orientation="vertical"+android:layout_width="fill_parent"
++++android:layout_height="fill_parent">

++++<com.example.TextViewPlus
++++++++android:id="@%2Bid/textViewPlus1"
++++++++android:layout_height="match_parent"
++++++++android:layout_width="match_parent"
++++++++android:text="@string/showingOffTheNewTypeface"
++++++++foo:customFont="saxmono.ttf">
++++</com.example.TextViewPlus>
</LinearLayout>|5306945|您可以将"saxmono.ttf“放在assets文件夹中。|5306946|更新8/1/13|5306947|这种方法存在严重的内存问题。请参阅下面的chedabob's+comment。|5306948|entityMap|0|LINK|mutability|MUTABLE|url|http://kevindion.com/2011/01/custom-xml-attributes-for-android-widgets/|1|https://stackoverflow.com/questions/2376250/custom-fonts-and-xml-layouts-android/7197867?noredirect=1#comment-11263047^0|6|4|0|0|0|I|0|0|0|A|0|0|0|9|0|0|0|0|K|I|1|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@$A|1B|B|1C|1|1D]]|C|$]]|$1|D|3|E|5|6|7|1E|8|@$A|1F|B|1G|F|G]]|9|@]|C|$]]|$1|H|3|I|5|J|7|1H|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|1I|8|@$A|1J|B|1K|F|G]]|9|@]|C|$]]|$1|O|3|P|5|J|7|1L|8|@]|9|@]|C|$K|L]]|$1|Q|3|R|5|6|7|1M|8|@$A|1N|B|1O|F|G]]|9|@]|C|$]]|$1|S|3|T|5|J|7|1P|8|@]|9|@]|C|$K|L]]|$1|U|3|V|5|6|7|1Q|8|@]|9|@]|C|$]]|$1|W|3|X|5|6|7|1R|8|@]|9|@]|C|$]]|$1|Y|3|Z|5|6|7|1S|8|@]|9|@$A|1T|B|1U|1|1V]]|C|$]]|$1|10|3|-4|5|6|7|1W|8|@]|9|@]|C|$]]]|11|$12|$5|13|14|15|C|$16|17]]|18|$5|13|14|15|C|$16|19]]]]

You can extend TextView to set custom fonts as I learned <a href="http://kevindion.com/2011/01/custom-xml-attributes-for-android-widgets/" rel="noreferrer">here</a>.

TextViewPlus.java: 

<pre><code>package com.example;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.TextView;

public class TextViewPlus extends TextView {
 private static final String TAG = "TextView";

 public TextViewPlus(Context context) {
 super(context);
 }

 public TextViewPlus(Context context, AttributeSet attrs) {
 super(context, attrs);
 setCustomFont(context, attrs);
 }

 public TextViewPlus(Context context, AttributeSet attrs, int defStyle) {
 super(context, attrs, defStyle);
 setCustomFont(context, attrs);
 }

 private void setCustomFont(Context ctx, AttributeSet attrs) {
 TypedArray a = ctx.obtainStyledAttributes(attrs, R.styleable.TextViewPlus);
 String customFont = a.getString(R.styleable.TextViewPlus_customFont);
 setCustomFont(ctx, customFont);
 a.recycle();
 }

 public boolean setCustomFont(Context ctx, String asset) {
 Typeface tf = null;
 try {
 tf = Typeface.createFromAsset(ctx.getAssets(), asset); 
 } catch (Exception e) {
 Log.e(TAG, "Could not get typeface: "+e.getMessage());
 return false;
 }

 setTypeface(tf); 
 return true;
 }

}
</code></pre>

attrs.xml: (in res/values)

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;resources&gt;
 &lt;declare-styleable name="TextViewPlus"&gt;
 &lt;attr name="customFont" format="string"/&gt;
 &lt;/declare-styleable&gt;
&lt;/resources&gt;
</code></pre>

main.xml:

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;LinearLayout 
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:foo="http://schemas.android.com/apk/res/com.example"
 android:orientation="vertical" android:layout_width="fill_parent"
 android:layout_height="fill_parent"&gt;

 &lt;com.example.TextViewPlus
 android:id="@+id/textViewPlus1"
 android:layout_height="match_parent"
 android:layout_width="match_parent"
 android:text="@string/showingOffTheNewTypeface"
 foo:customFont="saxmono.ttf"&gt;
 &lt;/com.example.TextViewPlus&gt;
&lt;/LinearLayout&gt;
</code></pre>

You would put "saxmono.ttf" in the assets folder.

<h1>UPDATE 8/1/13</h1>

There are serious memory concerns with this method. See <a href="https://stackoverflow.com/questions/2376250/custom-fonts-and-xml-layouts-android/7197867?noredirect=1#comment-11263047">chedabob's comment</a> below.

blocks|key|1507629|text|这是一个教程，向你展示了如何设置一个自定义字体，比如@peter+described：http://responsiveandroid.com/2012/03/15/custom-fonts-in-android-widgets.html|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1507630|它还考虑到了潜在的内存泄漏和http://code.google.com/p/android/issues/detail?id=9904。本教程中还有一个在按钮上设置自定义字体的示例。|1507631|entityMap|0|LINK|mutability|MUTABLE|url|http://responsiveandroid.com/2012/03/15/custom-fonts-in-android-widgets.html|1|http://code.google.com/p/android/issues/detail?id=9904^0|17|24|0|0|E|1I|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

Here's a tutorial that shows you how to setup a custom font like @peter described: <a href="http://responsiveandroid.com/2012/03/15/custom-fonts-in-android-widgets.html" rel="nofollow">http://responsiveandroid.com/2012/03/15/custom-fonts-in-android-widgets.html</a>

it also has consideration for potential memory leaks ala <a href="http://code.google.com/p/android/issues/detail?id=9904" rel="nofollow">http://code.google.com/p/android/issues/detail?id=9904</a> . Also in the tutorial is an example for setting a custom font on a button.

blocks|key|3889516|text|如果你只想添加一种字体，并且想要编写更少的代码，你可以为你的特定字体创建一个专用的TextView。请参阅下面的代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3889517|package+com.yourpackage;
import+android.content.Context;
import+android.graphics.Typeface;
import+android.util.AttributeSet;
import+android.widget.TextView;

public+class+FontTextView+extends+TextView+{
++++public+static+Typeface+FONT_NAME;


++++public+FontTextView(Context+context)+{
++++++++super(context);
++++++++if(FONT_NAME+==+null)+FONT_NAME+=+Typeface.createFromAsset(context.getAssets(),+"fonts/FontName.otf");
++++++++this.setTypeface(FONT_NAME);
++++}
++++public+FontTextView(Context+context,+AttributeSet+attrs)+{
++++++++super(context,+attrs);
++++++++if(FONT_NAME+==+null)+FONT_NAME+=+Typeface.createFromAsset(context.getAssets(),+"fonts/FontName.otf");
++++++++this.setTypeface(FONT_NAME);
++++}
++++public+FontTextView(Context+context,+AttributeSet+attrs,+int+defStyle)+{
++++++++super(context,+attrs,+defStyle);
++++++++if(FONT_NAME+==+null)+FONT_NAME+=+Typeface.createFromAsset(context.getAssets(),+"fonts/FontName.otf");
++++++++this.setTypeface(FONT_NAME);
++++}
}|code-block|syntax|javascript|3889518|在main.xml中，您现在可以像这样添加textView：|3889519|<com.yourpackage.FontTextView
++++android:id="@%2Bid/tvTimer"
++++android:layout_width="wrap_content"
++++android:layout_height="wrap_content"
++++android:text=""+/>|3889520|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If you only have one typeface you would like to add, and want less code to write, you can create a dedicated TextView for your specific font. See code below.

<pre><code>package com.yourpackage;
import android.content.Context;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.widget.TextView;

public class FontTextView extends TextView {
 public static Typeface FONT_NAME;


 public FontTextView(Context context) {
 super(context);
 if(FONT_NAME == null) FONT_NAME = Typeface.createFromAsset(context.getAssets(), "fonts/FontName.otf");
 this.setTypeface(FONT_NAME);
 }
 public FontTextView(Context context, AttributeSet attrs) {
 super(context, attrs);
 if(FONT_NAME == null) FONT_NAME = Typeface.createFromAsset(context.getAssets(), "fonts/FontName.otf");
 this.setTypeface(FONT_NAME);
 }
 public FontTextView(Context context, AttributeSet attrs, int defStyle) {
 super(context, attrs, defStyle);
 if(FONT_NAME == null) FONT_NAME = Typeface.createFromAsset(context.getAssets(), "fonts/FontName.otf");
 this.setTypeface(FONT_NAME);
 }
}
</code></pre>

In main.xml, you can now add your textView like this:

<pre><code>&lt;com.yourpackage.FontTextView
 android:id="@+id/tvTimer"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="" /&gt;
</code></pre>

blocks|key|3889531|text|Peter的回答是最好的，但是可以通过使用Android的styles.xml自定义你的应用程序中所有文本视图的字体来改进。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3889532|我的代码是here|offset|length|3889533|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/12281761/android-how-to-set-a-custom-font-for-whole-app/12282315#12282315^0|0|5|4|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Peter's answer is the best, but it can be improved by using the styles.xml from Android to customize your fonts for all textviews in your app.

My code is <a href="https://stackoverflow.com/questions/12281761/android-how-to-set-a-custom-font-for-whole-app/12282315#12282315" title="here">here</a>

blocks|key|3889549|text|这可能有点晚了，但您需要创建一个返回自定义字样的单例类，以避免内存泄漏。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3889550|TypeFace类：|3889551|public+class+OpenSans+{

private+static+OpenSans+instance;
private+static+Typeface+typeface;

public+static+OpenSans+getInstance(Context+context)+{
++++synchronized+(OpenSans.class)+{
++++++++if+(instance+==+null)+{
++++++++++++instance+=+new+OpenSans();
++++++++++++typeface+=+Typeface.createFromAsset(context.getResources().getAssets(),+"open_sans.ttf");
++++++++}
++++++++return+instance;
++++}
}

public+Typeface+getTypeFace()+{
++++return+typeface;
}
}|code-block|syntax|javascript|3889552|自定义TextView：|3889553|public+class+NativelyCustomTextView+extends+TextView+{

++++public+NativelyCustomTextView(Context+context)+{
++++++++super(context);
++++++++setTypeface(OpenSans.getInstance(context).getTypeFace());
++++}

++++public+NativelyCustomTextView(Context+context,+AttributeSet+attrs)+{
++++++++super(context,+attrs);
++++++++setTypeface(OpenSans.getInstance(context).getTypeFace());
++++}

++++public+NativelyCustomTextView(Context+context,+AttributeSet+attrs,
++++++++++++int+defStyle)+{
++++++++super(context,+attrs,+defStyle);
++++++++setTypeface(OpenSans.getInstance(context).getTypeFace());
++++}

}|3889554|通过xml：|3889555|<com.yourpackage.views.NativelyCustomTextView
++++++++++++android:id="@%2Bid/natively_text_view"
++++++++++++android:layout_width="wrap_content"
++++++++++++android:layout_height="wrap_content"
++++++++++++android:layout_centerHorizontal="true"
++++++++++++android:layout_margin="20dp"
++++++++++++android:text="@string/natively"
++++++++++++android:textSize="30sp"+/>+|3889556|以编程方式：|3889557|TextView+programmaticallyTextView+=+(TextView)+
+++++++findViewById(R.id.programmatically_text_view);

programmaticallyTextView.setTypeface(OpenSans.getInstance(this)
++++++++++++++++.getTypeFace());|3889558|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

This might be a little late, but you need to create a singleton class that returns the custom typeface to avoid memory leaks.

TypeFace class:

<pre><code>public class OpenSans {

private static OpenSans instance;
private static Typeface typeface;

public static OpenSans getInstance(Context context) {
 synchronized (OpenSans.class) {
 if (instance == null) {
 instance = new OpenSans();
 typeface = Typeface.createFromAsset(context.getResources().getAssets(), "open_sans.ttf");
 }
 return instance;
 }
}

public Typeface getTypeFace() {
 return typeface;
}
}
</code></pre>

Custom TextView:

<pre><code>public class NativelyCustomTextView extends TextView {

 public NativelyCustomTextView(Context context) {
 super(context);
 setTypeface(OpenSans.getInstance(context).getTypeFace());
 }

 public NativelyCustomTextView(Context context, AttributeSet attrs) {
 super(context, attrs);
 setTypeface(OpenSans.getInstance(context).getTypeFace());
 }

 public NativelyCustomTextView(Context context, AttributeSet attrs,
 int defStyle) {
 super(context, attrs, defStyle);
 setTypeface(OpenSans.getInstance(context).getTypeFace());
 }

}
</code></pre>

By xml:

<pre><code>&lt;com.yourpackage.views.NativelyCustomTextView
 android:id="@+id/natively_text_view"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centerHorizontal="true"
 android:layout_margin="20dp"
 android:text="@string/natively"
 android:textSize="30sp" /&gt; 
</code></pre>

Programmatically:

<pre><code>TextView programmaticallyTextView = (TextView) 
 findViewById(R.id.programmatically_text_view);

programmaticallyTextView.setTypeface(OpenSans.getInstance(this)
 .getTypeFace());
</code></pre>

blocks|key|1778982|text|我迟到了3年的聚会:(然而，这对那些偶然发现这篇文章的人可能是有用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1778983|我已经编写了一个缓存字体的库，还允许您直接从XML指定自定义字体。您可以找到库here。|offset|length|1778984|下面是您使用XML布局时的外观。|1778985|<com.mobsandgeeks.ui.TypefaceTextView
++++android:layout_width="wrap_content"
++++android:layout_height="wrap_content"
++++android:text="@string/hello_world"
++++geekui:customTypeface="fonts/custom_font.ttf"+/>|code-block|syntax|javascript|1778986|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/ragunathjawahar/android-typeface-textview^0|0|13|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

I'm 3 years late for the party :( However this could be useful for someone who might stumble upon this post.

I've written a library that caches Typefaces and also allow you to specify custom typefaces right from XML. You can find the library <a href="https://github.com/ragunathjawahar/android-typeface-textview">here</a>.

Here is how your XML layout would look like, when you use it.

<pre><code>&lt;com.mobsandgeeks.ui.TypefaceTextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="@string/hello_world"
 geekui:customTypeface="fonts/custom_font.ttf" /&gt;
</code></pre>

blocks|key|3889602|text|对于这个问题，我可能有一个简单的答案，而不需要扩展TextView和实现长代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3889603|代码:|offset|length|style|BOLD|3889604|+TextView+tv+=+(TextView)+findViewById(R.id.textview1);
++++tv.setTypeface(Typeface.createFromAsset(getAssets(),+"font.ttf"));|code-block|syntax|javascript|3889605|像往常一样将自定义字体文件放在assets文件夹中，并尝试此操作。这对我很管用。我只是不明白为什么peter对这个简单的东西给出了这么大的代码，或者他用旧版本给出了他的答案。|3889606|entityMap^0|0|0|3|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|U|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I might have a simple answer for the question without extending the TextView and implementing a long code.

Code :

<pre><code> TextView tv = (TextView) findViewById(R.id.textview1);
 tv.setTypeface(Typeface.createFromAsset(getAssets(), "font.ttf"));
</code></pre>

Place the custom font file in assets folder as usual and try this. It works for me.
I just dont understand why peter has given such a huge code for this simple thing or he has given his answer in old version.

blocks|key|5307146|text|这是一个老问题，但我真希望在开始寻找好的解决方案之前，我能在这里读到这个答案。Calligraphy扩展了android:fontFamily属性，以添加对资源文件夹中的自定义字体的支持，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5307147|<TextView+
++android:text="@string/hello_world"
++android:layout_width="wrap_content"
++android:layout_height="wrap_content"
++android:fontFamily="fonts/Roboto-Bold.ttf"/>|code-block|syntax|javascript|5307148|要激活它，唯一需要做的就是将它附加到您正在使用的活动的上下文中：|5307149|@Override
protected+void+attachBaseContext(Context+newBase)+{
++++super.attachBaseContext(new+CalligraphyContextWrapper(newBase));
}|5307150|您还可以指定自己的自定义属性来替换android:fontFamily|5307151|它也适用于主题，包括AppTheme。|5307152|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/chrisjenx/Calligraphy^0|1H|I|13|B|0|0|0|0|0|H|I|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|17|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|18|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1C|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]]]

Old question, but I sure wish I read this answer here before I started my own search for a good solution. <a href="https://github.com/chrisjenx/Calligraphy" rel="noreferrer">Calligraphy</a> extends the <code>android:fontFamily</code> attribute to add support for custom fonts in your asset folder, like so:

<pre><code>&lt;TextView 
 android:text="@string/hello_world"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:fontFamily="fonts/Roboto-Bold.ttf"/&gt;
</code></pre>

The only thing you have to do to activate it is attaching it to the Context of the Activity you're using:

<pre><code>@Override
protected void attachBaseContext(Context newBase) {
 super.attachBaseContext(new CalligraphyContextWrapper(newBase));
}
</code></pre>

You can also specify your own custom attribute to replace <code>android:fontFamily</code>

It also works in themes, including the AppTheme.

blocks|key|1507727|text|Fontinator是一个Android库，使使用自定义字体变得容易。https://github.com/svendvd/Fontinator|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1507728|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/svendvd/Fontinator^0|Z|11|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Fontinator is an Android-Library make it easy, to use custom Fonts.
<a href="https://github.com/svendvd/Fontinator" rel="nofollow">https://github.com/svendvd/Fontinator</a>

blocks|key|3889669|text|使用DataBinding：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3889670|@BindingAdapter({"bind:font"})
public+static+void+setFont(TextView+textView,+String+fontName){
+textView.setTypeface(Typeface.createFromAsset(textView.getContext().getAssets(),+"fonts/"+%2B+fontName));
}|code-block|syntax|javascript|3889671|在XML中：|3889672|<TextView
app:font="@{`Source-Sans-Pro-Regular.ttf`}"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>|3889673|字体文件必须为assets/fonts/格式|offset|length|style|CODE|3889674|entityMap^0|0|0|0|0|7|D|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Using DataBinding :

<pre><code>@BindingAdapter({"bind:font"})
public static void setFont(TextView textView, String fontName){
 textView.setTypeface(Typeface.createFromAsset(textView.getContext().getAssets(), "fonts/" + fontName));
}
</code></pre>

In XML:

<pre><code>&lt;TextView
app:font="@{`Source-Sans-Pro-Regular.ttf`}"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/&gt;
</code></pre>

font file must be in <code>assets/fonts/</code>

blocks|key|3889696|text|也可以在xml中定义，而无需创建自定义类|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3889697|style.xml|3889698|<style+name="ionicons"+parent="android:TextAppearance">
++++
++++<item+name="fontPath">fonts/ionicons.ttf</item>
</style>|code-block|syntax|javascript|3889699|activity_main.xml|3889700|<LinearLayout+xmlns:android="http://schemas.android.com/apk/res/android"
++++++++++++++xmlns:app="http://schemas.android.com/apk/res-auto"
++++++++++++++android:layout_width="match_parent"
++++++++++++++android:layout_height="match_parent"
++++++++++++++android:orientation="vertical"+>
++++<Button
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"
++++++++android:textAppearance="@style/ionicons"
++++++++android:text=""/>
</LinearLayout>|3889701|快速说明一下，因为我总是忘记将字体放在哪里，所以字体必须在assets中，并且这个文件夹与res和src__位于同一级别，在我的例子中是它的assets/fonts/ionicons.ttf|offset|length|style|CODE|3889702|已更新添加了根布局，因为此方法需要xmlns:app="http://schemas.android.com/apk/res-auto"才能工作|BOLD|3889703|Update2忘记了我之前安装的一个名为Calligraphy的库|3889704|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/chrisjenx/Calligraphy^0|0|0|0|0|0|T|6|19|3|1D|3|1Y|P|0|0|3|H|1F|0|0|7|K|B|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|16|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|17|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|18|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|19|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|1A|8|@$O|1B|P|1C|Q|R]|$O|1D|P|1E|Q|R]|$O|1F|P|1G|Q|R]|$O|1H|P|1I|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1J|8|@$O|1K|P|1L|Q|U]|$O|1M|P|1N|Q|R]]|9|@]|A|$]]|$1|V|3|W|5|6|7|1O|8|@$O|1P|P|1Q|Q|U]]|9|@$O|1R|P|1S|1|1T]]|A|$]]|$1|X|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]]|Y|$Z|$5|10|11|12|A|$13|14]]]]

Also can be defined in the xml without creating custom classes

style.xml

<pre><code>&lt;style name="ionicons" parent="android:TextAppearance"&gt;
 &lt;!-- Custom Attr--&gt;
 &lt;item name="fontPath"&gt;fonts/ionicons.ttf&lt;/item&gt;
&lt;/style&gt;
</code></pre>

activity_main.xml

<pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" &gt;
 &lt;Button
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:textAppearance="@style/ionicons"
 android:text=""/&gt;
&lt;/LinearLayout&gt;
</code></pre>

A quick note, because I just always forgot where to put the fonts, its that the font must be inside <code>assets</code> and this folder resides in the same level that <code>res</code> and <code>src</code>, in my case its <code>assets/fonts/ionicons.ttf</code>

Updated Added root layout because this method needs <code>xmlns:app="http://schemas.android.com/apk/res-auto"</code> to work

Update 2 Forgot about a library that I've installed before called <a href="https://github.com/chrisjenx/Calligraphy" rel="nofollow">Calligraphy</a>

blocks|key|3889732|text|在Android+O预览版中，最好的方法是这样做|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3889733|1.)右键单击res文件夹，进入新建>+Android资源目录。最新消息|offset|length|style|BOLD|3889734|此时将显示资源目录窗口。|3889735|2.)在“资源类型”列表中，选择“字体”，然后单击“确定”。|3889736|3.)将字体文件添加到下面的字体文件夹和文件夹结构中，将生成R.font.dancing_script、R.font.la_la和R.font.ba_ba。|3889737|4.)Double-click字体文件以在编辑器中预览该文件的字体。|3889738|接下来，我们必须创建一个字体系列|3889739|1.)右键单击字体文件夹，然后转到新建>字体资源文件。此时将出现“New+Resource+File”窗口。|3889740|2.)输入文件名，然后单击OK。新的字体资源XML将在编辑器中打开。|3889741|3.)在font标签元素中包含每个字体文件、样式和粗细属性。以下XML说明了如何在字体资源XML中添加与字体相关的属性：|3889742|<?xml+version="1.0"+encoding="utf-8"?>
<font-family+xmlns:android="http://schemas.android.com/apk/res/android">
++++
++++
</font-family>|code-block|syntax|javascript|3889743|向TextView添加字体：|3889744|+++<TextView
++++android:layout_width="wrap_content"
++++android:layout_height="wrap_content"
++++**android:fontFamily="@font/ba_ba"**/>|3889745|从文档中看|3889746|3889747|+Working+With+Fonts|blockquote|3889748|3889749|3889750|所有步骤都是正确的。|3889751|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/preview/features/working-with-fonts.html^0|0|7|6|G|F|0|0|H|2|0|3|23|0|0|Y|0|0|G|0|0|1I|0|0|Y|0|0|1O|0|0|0|E|0|0|0|5|0|0|1|I|1|I|0|0|0|0|0|A|0^^$0|@$1|2|3|4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1P|8|@$D|1Q|E|1R|F|G]|$D|1S|E|1T|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1U|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1V|8|@$D|1W|E|1X|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|1Y|8|@$D|1Z|E|20|F|G]]|9|@]|A|$]]|$1|N|3|O|5|6|7|21|8|@$D|22|E|23|F|G]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|24|8|@$D|25|E|26|F|G]]|9|@]|A|$]]|$1|R|3|S|5|6|7|27|8|@$D|28|E|29|F|G]]|9|@]|A|$]]|$1|T|3|U|5|6|7|2A|8|@$D|2B|E|2C|F|G]]|9|@]|A|$]]|$1|V|3|W|5|6|7|2D|8|@$D|2E|E|2F|F|G]]|9|@]|A|$]]|$1|X|3|Y|5|Z|7|2G|8|@]|9|@]|A|$10|11]]|$1|12|3|13|5|6|7|2H|8|@$D|2I|E|2J|F|G]]|9|@]|A|$]]|$1|14|3|15|5|Z|7|2K|8|@]|9|@]|A|$10|11]]|$1|16|3|17|5|6|7|2L|8|@$D|2M|E|2N|F|G]]|9|@]|A|$]]|$1|18|3|-4|5|6|7|2O|8|@]|9|@]|A|$]]|$1|19|3|1A|5|1B|7|2P|8|@$D|2Q|E|2R|F|G]]|9|@$D|2S|E|2T|1|2U]]|A|$]]|$1|1C|3|-4|5|6|7|2V|8|@]|9|@]|A|$]]|$1|1D|3|-4|5|6|7|2W|8|@]|9|@]|A|$]]|$1|1E|3|1F|5|6|7|2X|8|@$D|2Y|E|2Z|F|G]]|9|@]|A|$]]|$1|1G|3|-4|5|6|7|30|8|@]|9|@]|A|$]]]|1H|$1I|$5|1J|1K|1L|A|$1M|1N]]]]

The best way to do it From Android O preview release is this way 
1.)Right-click the res folder and go to New > Android resource directory. The New 
Resource Directory window appears. 
2.)In the Resource type list, select font, and then click OK. 
3.)Add your font files in the font folder.The folder structure below generates R.font.dancing_script, R.font.la_la, and R.font.ba_ba. 
4.)Double-click a font file to preview the file's fonts in the editor.

Next we must create a font family

1.)Right-click the font folder and go to New > Font resource file. The New Resource File window appears. 
2.)Enter the file name, and then click OK. The new font resource XML opens in the editor. 
3.)Enclose each font file, style, and weight attribute in the font tag element. The following XML illustrates adding font-related attributes in the font resource XML:

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;font-family xmlns:android="http://schemas.android.com/apk/res/android"&gt;
 &lt;font
 android:fontStyle="normal"
 android:fontWeight="400"
 android:font="@font/hey_regular" /&gt;
 &lt;font
 android:fontStyle="italic"
 android:fontWeight="400"
 android:font="@font/hey_bababa" /&gt;
&lt;/font-family&gt;
</code></pre>

Adding fonts to a TextView:

<pre><code> &lt;TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 **android:fontFamily="@font/ba_ba"**/&gt;
</code></pre>

As from the documentation 

<blockquote>
 <a href="https://developer.android.com/preview/features/working-with-fonts.html" rel="noreferrer">Working With Fonts</a>
</blockquote>

all the steps are correct.

blocks|key|5307317|text|自定义字体有两种方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5307318|!!！assets/fonts/iran_sans.ttf中的自定义字体|5307319|方式1+:+Refrection+Typeface.class+%7C最佳方式|offset|length|style|BOLD|5307320|在类扩展应用程序中调用FontsOverride.setDefaultFont()，此代码将导致所有软件字体更改，甚至Toast字体也会更改|5307321|AppController.java|5307322|public+class+AppController+extends+Application+{

++++@Override
++++public+void+onCreate()+{
++++++++super.onCreate();

++++++++//Initial+Font
++++++++FontsOverride.setDefaultFont(getApplicationContext(),+"MONOSPACE",+"fonts/iran_sans.ttf");

++++}
}|code-block|syntax|javascript|5307323|FontsOverride.java|5307324|public+class+FontsOverride+{

++++public+static+void+setDefaultFont(Context+context,+String+staticTypefaceFieldName,+String+fontAssetName)+{
++++++++final+Typeface+regular+=+Typeface.createFromAsset(context.getAssets(),+fontAssetName);
++++++++replaceFont(staticTypefaceFieldName,+regular);
++++}

++++private+static+void+replaceFont(String+staticTypefaceFieldName,+final+Typeface+newTypeface)+{
++++++++try+{
++++++++++++final+Field+staticField+=+Typeface.class.getDeclaredField(staticTypefaceFieldName);
++++++++++++staticField.setAccessible(true);
++++++++++++staticField.set(null,+newTypeface);
++++++++}+catch+(NoSuchFieldException+e)+{
++++++++++++e.printStackTrace();
++++++++}+catch+(IllegalAccessException+e)+{
++++++++++++e.printStackTrace();
++++++++}
++++}
}|5307325|5307326|方法2:使用setTypeface|5307327|对于特殊视图，只需调用setTypeface()来更改字体。|5307328|CTextView.java|5307329|public+class+CTextView+extends+TextView+{

++++public+CTextView(Context+context)+{
++++++++super(context);
++++++++init(context,null);
++++}

++++public+CTextView(Context+context,+@Nullable+AttributeSet+attrs)+{
++++++++super(context,+attrs);
++++++++init(context,attrs);
++++}

++++public+CTextView(Context+context,+@Nullable+AttributeSet+attrs,+int+defStyleAttr)+{
++++++++super(context,+attrs,+defStyleAttr);
++++++++init(context,attrs);
++++}

++++@RequiresApi(api+=+Build.VERSION_CODES.LOLLIPOP)
++++public+CTextView(Context+context,+@Nullable+AttributeSet+attrs,+int+defStyleAttr,+int+defStyleRes)+{
++++++++super(context,+attrs,+defStyleAttr,+defStyleRes);
++++++++init(context,attrs);
++++}

++++public+void+init(Context+context,+@Nullable+AttributeSet+attrs)+{

++++++++if+(isInEditMode())
++++++++++++return;

++++++++//+use+setTypeface+for+change+font+this+view
++++++++setTypeface(FontUtils.getTypeface("fonts/iran_sans.ttf"));

++++}
}|5307330|FontUtils.java|5307331|public+class+FontUtils+{

++++private+static+Hashtable<String,+Typeface>+fontCache+=+new+Hashtable<>();

++++public+static+Typeface+getTypeface(String+fontName)+{
++++++++Typeface+tf+=+fontCache.get(fontName);
++++++++if+(tf+==+null)+{
++++++++++++try+{
++++++++++++++++tf+=+Typeface.createFromAsset(AppController.getInstance().getApplicationContext().getAssets(),+fontName);
++++++++++++}+catch+(Exception+e)+{
++++++++++++++++e.printStackTrace();
++++++++++++++++return+null;
++++++++++++}
++++++++++++fontCache.put(fontName,+tf);
++++++++}
++++++++return+tf;
++++}

}|5307332|entityMap^0|0|0|0|5|0|0|0|I|0|0|0|I|0|0|0|0|4|0|0|0|E|0|0|0|E|0|0^^$0|@$1|2|3|4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1C|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1D|8|@$F|1E|G|1F|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|1G|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1H|8|@$F|1I|G|1J|H|I]]|9|@]|A|$]]|$1|N|3|O|5|P|7|1K|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|1L|8|@$F|1M|G|1N|H|I]]|9|@]|A|$]]|$1|U|3|V|5|P|7|1O|8|@]|9|@]|A|$Q|R]]|$1|W|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]|$1|X|3|Y|5|6|7|1Q|8|@$F|1R|G|1S|H|I]]|9|@]|A|$]]|$1|Z|3|10|5|6|7|1T|8|@]|9|@]|A|$]]|$1|11|3|12|5|6|7|1U|8|@$F|1V|G|1W|H|I]]|9|@]|A|$]]|$1|13|3|14|5|P|7|1X|8|@]|9|@]|A|$Q|R]]|$1|15|3|16|5|6|7|1Y|8|@$F|1Z|G|20|H|I]]|9|@]|A|$]]|$1|17|3|18|5|P|7|21|8|@]|9|@]|A|$Q|R]]|$1|19|3|-4|5|6|7|22|8|@]|9|@]|A|$]]]|1A|$]]

There are two ways to customize fonts :

!!! my custom font in assets/fonts/iran_sans.ttf

Way 1 :
Refrection Typeface.class ||| best way

call FontsOverride.setDefaultFont() in class extends Application, This code will cause all software fonts to be changed, even Toasts fonts 

AppController.java

<pre><code>public class AppController extends Application {

 @Override
 public void onCreate() {
 super.onCreate();

 //Initial Font
 FontsOverride.setDefaultFont(getApplicationContext(), "MONOSPACE", "fonts/iran_sans.ttf");

 }
}
</code></pre>

FontsOverride.java

<pre><code>public class FontsOverride {

 public static void setDefaultFont(Context context, String staticTypefaceFieldName, String fontAssetName) {
 final Typeface regular = Typeface.createFromAsset(context.getAssets(), fontAssetName);
 replaceFont(staticTypefaceFieldName, regular);
 }

 private static void replaceFont(String staticTypefaceFieldName, final Typeface newTypeface) {
 try {
 final Field staticField = Typeface.class.getDeclaredField(staticTypefaceFieldName);
 staticField.setAccessible(true);
 staticField.set(null, newTypeface);
 } catch (NoSuchFieldException e) {
 e.printStackTrace();
 } catch (IllegalAccessException e) {
 e.printStackTrace();
 }
 }
}
</code></pre>

<hr>

Way 2: use setTypeface

for special view just call setTypeface() to change font.

CTextView.java

<pre><code>public class CTextView extends TextView {

 public CTextView(Context context) {
 super(context);
 init(context,null);
 }

 public CTextView(Context context, @Nullable AttributeSet attrs) {
 super(context, attrs);
 init(context,attrs);
 }

 public CTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
 super(context, attrs, defStyleAttr);
 init(context,attrs);
 }

 @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
 public CTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
 super(context, attrs, defStyleAttr, defStyleRes);
 init(context,attrs);
 }

 public void init(Context context, @Nullable AttributeSet attrs) {

 if (isInEditMode())
 return;

 // use setTypeface for change font this view
 setTypeface(FontUtils.getTypeface("fonts/iran_sans.ttf"));

 }
}
</code></pre>

FontUtils.java

<pre><code>public class FontUtils {

 private static Hashtable&lt;String, Typeface&gt; fontCache = new Hashtable&lt;&gt;();

 public static Typeface getTypeface(String fontName) {
 Typeface tf = fontCache.get(fontName);
 if (tf == null) {
 try {
 tf = Typeface.createFromAsset(AppController.getInstance().getApplicationContext().getAssets(), fontName);
 } catch (Exception e) {
 e.printStackTrace();
 return null;
 }
 fontCache.put(fontName, tf);
 }
 return tf;
 }

}
</code></pre>

blocks|key|5307345|text|你可以很容易的定制textview类：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5307346|所以你需要做的第一件事，就是创建一个用AppCompatTextView扩展的Custom+textview类。|offset|length|style|CODE|5307347|public+class+CustomTextView+extends+AppCompatTextView+{
++++private+int+mFont+=+FontUtils.FONTS_NORMAL;
++++boolean+fontApplied;

++++public+CustomTextView(Context+context,+AttributeSet+attrs,+int+defStyle)+{
++++++++super(context,+attrs,+defStyle);
++++++++init(attrs,+context);
++++}

++++public+CustomTextView(Context+context,+AttributeSet+attrs)+{
++++++++super(context,+attrs);
++++++++init(attrs,+context);
++++}

++++public+CustomTextView(Context+context)+{
++++++++super(context);
++++++++init(null,+context);
++++}

++++protected+void+init(AttributeSet+attrs,+Context+cxt)+{
++++++++if+(!fontApplied)+{
++++++++++++if+(attrs+!=+null)+{
++++++++++++++++mFont+=+attrs.getAttributeIntValue(
++++++++++++++++++++++++"http://schemas.android.com/apk/res-auto",+"Lato-Regular.ttf",
++++++++++++++++++++++++-1);
++++++++++++}
++++++++++++Typeface+typeface+=+getTypeface();
++++++++++++int+typefaceStyle+=+Typeface.NORMAL;
++++++++++++if+(typeface+!=+null)+{
++++++++++++++++typefaceStyle+=+typeface.getStyle();
++++++++++++}
++++++++++++if+(mFont+>+FontUtils.FONTS)+{
++++++++++++++++typefaceStyle+=+mFont;
++++++++++++}
++++++++++++FontUtils.applyFont(this,+typefaceStyle);
++++++++++++fontApplied+=+true;
++++++++}
++++}
}|code-block|syntax|javascript|5307348|现在，每次自定义文本视图调用时，我们都会从属性int+fontValue+=+attrs.getAttributeIntValue("http://schemas.android.com/apk/res-auto","Lato-Regular.ttf",-1)中获取int值。|5307349|或|5307350|我们还可以从我们在xml+(android:textStyle="bold%7Cnormal%7Citalic")中设置的视图中获取getTypeface()。所以你想做什么就做什么吧。|5307351|现在，我们使用FontUtils来设置视图中的任何.ttf字体。|5307352|public+class+FontUtils+{

++++public+static+final+int+FONTS+=+1;
++++public+static+final+int+FONTS_NORMAL+=+2;
++++public+static+final+int+FONTS_BOLD+=+3;
++++public+static+final+int+FONTS_BOLD1+=+4;

++++private+static+Map<String,+Typeface>+TYPEFACE+=+new+HashMap<String,+Typeface>();

++++static+Typeface+getFonts(Context+context,+String+name)+{
++++++++Typeface+typeface+=+TYPEFACE.get(name);
++++++++if+(typeface+==+null)+{
++++++++++++typeface+=+Typeface.createFromAsset(context.getAssets(),+name);
++++++++++++TYPEFACE.put(name,+typeface);
++++++++}
++++++++return+typeface;
++++}

++++public+static+void+applyFont(TextView+tv,+int+typefaceStyle)+{

++++++++Context+cxt+=+tv.getContext();
++++++++Typeface+typeface;

++++++++if(typefaceStyle+==+Typeface.BOLD_ITALIC)+{
++++++++++++typeface+=+FontUtils.getFonts(cxt,+"FaktPro-Normal.ttf");
++++++++}else+if+(typefaceStyle+==+Typeface.BOLD+%7C%7C+typefaceStyle+==+SD_FONTS_BOLD%7C%7C+typefaceStyle+==+FONTS_BOLD1)+{
++++++++++++typeface+=+FontUtils.getFonts(cxt,+"FaktPro-SemiBold.ttf");
++++++++}+else+if+(typefaceStyle+==+Typeface.ITALIC)+{
++++++++++++typeface+=+FontUtils.getFonts(cxt,+"FaktPro-Thin.ttf");
++++++++}+else+{
++++++++++++typeface+=+FontUtils.getFonts(cxt,+"FaktPro-Normal.ttf");
++++++++}
++++++++if+(typeface+!=+null)+{
++++++++++++tv.setTypeface(typeface);
++++++++}
++++}
}|5307353|entityMap^0|0|J|H|13|F|0|0|N|2Z|0|0|E|12|0|7|9|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]|$D|12|E|13|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|14|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|15|8|@$D|16|E|17|F|G]]|9|@]|A|$]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|19|8|@$D|1A|E|1B|F|G]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1C|8|@$D|1D|E|1E|F|G]]|9|@]|A|$]]|$1|U|3|V|5|J|7|1F|8|@]|9|@]|A|$K|L]]|$1|W|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|X|$]]

You can make easily custom textview class :-

So what you need to do first, make <code>Custom textview</code> class which extended with <code>AppCompatTextView</code>.

<pre><code>public class CustomTextView extends AppCompatTextView {
 private int mFont = FontUtils.FONTS_NORMAL;
 boolean fontApplied;

 public CustomTextView(Context context, AttributeSet attrs, int defStyle) {
 super(context, attrs, defStyle);
 init(attrs, context);
 }

 public CustomTextView(Context context, AttributeSet attrs) {
 super(context, attrs);
 init(attrs, context);
 }

 public CustomTextView(Context context) {
 super(context);
 init(null, context);
 }

 protected void init(AttributeSet attrs, Context cxt) {
 if (!fontApplied) {
 if (attrs != null) {
 mFont = attrs.getAttributeIntValue(
 "http://schemas.android.com/apk/res-auto", "Lato-Regular.ttf",
 -1);
 }
 Typeface typeface = getTypeface();
 int typefaceStyle = Typeface.NORMAL;
 if (typeface != null) {
 typefaceStyle = typeface.getStyle();
 }
 if (mFont &gt; FontUtils.FONTS) {
 typefaceStyle = mFont;
 }
 FontUtils.applyFont(this, typefaceStyle);
 fontApplied = true;
 }
 }
}
</code></pre>

Now , every time Custom text view call and we will get int value from attribute <code>int fontValue = attrs.getAttributeIntValue("http://schemas.android.com/apk/res-auto","Lato-Regular.ttf",-1)</code>.

Or

We can also get getTypeface() from view which we set in our xml (<code>android:textStyle="bold|normal|italic"</code>). So do what ever you want to do.

Now, we make <code>FontUtils</code> for set any .ttf font into our view.

<pre><code>public class FontUtils {

 public static final int FONTS = 1;
 public static final int FONTS_NORMAL = 2;
 public static final int FONTS_BOLD = 3;
 public static final int FONTS_BOLD1 = 4;

 private static Map&lt;String, Typeface&gt; TYPEFACE = new HashMap&lt;String, Typeface&gt;();

 static Typeface getFonts(Context context, String name) {
 Typeface typeface = TYPEFACE.get(name);
 if (typeface == null) {
 typeface = Typeface.createFromAsset(context.getAssets(), name);
 TYPEFACE.put(name, typeface);
 }
 return typeface;
 }

 public static void applyFont(TextView tv, int typefaceStyle) {

 Context cxt = tv.getContext();
 Typeface typeface;

 if(typefaceStyle == Typeface.BOLD_ITALIC) {
 typeface = FontUtils.getFonts(cxt, "FaktPro-Normal.ttf");
 }else if (typefaceStyle == Typeface.BOLD || typefaceStyle == SD_FONTS_BOLD|| typefaceStyle == FONTS_BOLD1) {
 typeface = FontUtils.getFonts(cxt, "FaktPro-SemiBold.ttf");
 } else if (typefaceStyle == Typeface.ITALIC) {
 typeface = FontUtils.getFonts(cxt, "FaktPro-Thin.ttf");
 } else {
 typeface = FontUtils.getFonts(cxt, "FaktPro-Normal.ttf");
 }
 if (typeface != null) {
 tv.setTypeface(typeface);
 }
 }
}
</code></pre>

blocks|key|1512085|text|知道从Android8.0(API26级)开始你就可以use+a+custom+font+in+XML了，这可能很有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1512086|您可以通过以下方式将自定义字体应用于整个应用程序。|1512087|1512088|将字体放在文件夹res/font.|ordered-list-item|style|CODE|1512089|In中，并在应用程序主题中使用它。<style+name="AppTheme"+parent="{whatever+you+like}">+++++<item+name="android:fontFamily">@font/myfont</item>+</style>|1512090|1512091|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml^0|R|O|0|0|0|0|8|8|0|H|39|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|11|8|@]|9|@]|C|$]]|$1|G|3|H|5|I|7|12|8|@$A|13|B|14|J|K]]|9|@]|C|$]]|$1|L|3|M|5|I|7|15|8|@$A|16|B|17|J|K]]|9|@]|C|$]]|$1|N|3|-4|5|6|7|18|8|@]|9|@]|C|$]]|$1|O|3|-4|5|6|7|19|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

It may be useful to know that starting from Android 8.0 (API level 26) you can <a href="https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml" rel="nofollow noreferrer">use a custom font in XML</a>.

You can apply a custom font to the entire application in the following way.

<ol>
<li>Put the font in the folder <code>res/font</code>.</li>
<li>In <code>res/values/styles.xml</code> use it in the application theme.
<code>
&lt;style name="AppTheme" parent="{whatever you like}"&gt;
 &lt;item name="android:fontFamily"&gt;@font/myfont&lt;/item&gt;
&lt;/style&gt;
</code></li>
</ol>

I'm trying to define a GUI layout using XML files in Android. As far as I can find out, there is no way to specify that your widgets should use a custom font (e.g. one you've placed in assets/font/) in XML files and you can only use the system installed fonts.

I know that, in the Java code, I could change the font of each widget manually using unique IDs. Alternatively, I could iterate over all the widgets in Java to make this change, but this would probably be very slow.

What other options do I have? Is there any better ways to making widgets that have a custom look? I don't particularly want to have to manually change the font for every new widget I add.

Custom fonts and XML layouts (Android)

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试使用Android中的XML文件来定义GUI布局。据我所知，没有办法指定您的小部件应该在XML文件中使用自定义字体(例如，您放置在assets/ font /中的字体)，并且您只能使用系统安装的字体。我知道，在Java代码中，我可以使用惟一的ID手动更改每个小部件的字体。或者，我可以遍历Java中的所有小部件...

问自定义字体和XML布局(Android)
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