我以前成功地使用过这个方法。我们的实现之间的唯一区别是，我没有在资产中使用子文件夹。但不确定这是否会改变什么。

Open your project and select Project on the top left app --> src --> main right click to main and create directory name it as assets right click to assest and create new directory name it fonts you need to find free fonts like free fonts give it to your Textview and call it in your Activity class copy your fonts inside the fonts folder TextView txt = (TextView) findViewById(R.id.txt_act_spalsh_welcome); Typeface font = Typeface.createFromAsset(getAssets(), "fonts/Aramis Italic.ttf"); txt.setTypeface(font);

字体名称必须正确，有乐趣

在API 26的官方文档中描述了这样做的正确方法:

https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml.html

这包括将ttf文件放在res/font文件夹中，并创建一个字体家族文件。

你可以在https://github.com/neopixl/PixlUI上使用PixlUI

导入他们的.jar并在XML中使用它

 <com.neopixl.pixlui.components.textview.TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/hello_world"
    pixlui:typeface="GearedSlab.ttf" />

确保在调用super和setContentView()之后将上述代码粘贴到onCreate()中。这个小细节让我挂念了一会儿。

我知道已经有了很好的答案，但这里有一个完全工作的实现。

这是自定义文本视图:

package com.mycompany.myapp.widget;

/**
 * Text view with a custom font.
 * <p/>
 * In the XML, use something like {@code customAttrs:customFont="roboto-thin"}. The list of fonts
 * that are currently supported are defined in the enum {@link CustomFont}. Remember to also add
 * {@code xmlns:customAttrs="http://schemas.android.com/apk/res-auto"} in the header.
 */
public class CustomFontTextView extends TextView {

    private static final String sScheme =
            "http://schemas.android.com/apk/res-auto";
    private static final String sAttribute = "customFont";

    static enum CustomFont {
        ROBOTO_THIN("fonts/Roboto-Thin.ttf"),
        ROBOTO_LIGHT("fonts/Roboto-Light.ttf");

        private final String fileName;

        CustomFont(String fileName) {
            this.fileName = fileName;
        }

        static CustomFont fromString(String fontName) {
            return CustomFont.valueOf(fontName.toUpperCase(Locale.US));
        }

        public Typeface asTypeface(Context context) {
            return Typeface.createFromAsset(context.getAssets(), fileName);
        }
    }

    public CustomFontTextView(Context context, AttributeSet attrs) {
        super(context, attrs);

        if (isInEditMode()) {
            return;
        } else {
            final String fontName = attrs.getAttributeValue(sScheme, sAttribute);

            if (fontName == null) {
                throw new IllegalArgumentException("You must provide \"" + sAttribute + "\" for your text view");
            } else {
                final Typeface customTypeface = CustomFont.fromString(fontName).asTypeface(context);
                setTypeface(customTypeface);
            }
        }
    }
}

这里是自定义属性。这应该进入你的res/attrs.xml文件:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="CustomFontTextView">
        <attr name="customFont" format="string"/>
    </declare-styleable>
</resources>

下面是你如何使用它。我将使用一个相对布局来包装它并显示customAttr声明，但它显然可以是您已经拥有的任何布局。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:customAttrs="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.mycompany.myapp.widget.CustomFontTextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="foobar"
         customAttrs:customFont="roboto_thin" />

</RelativeLayout>