How Can I Customize Fonts in Android XML Layouts?

Customizing Fonts in XML Layouts (Android)

As you have noticed, defining widget fonts in XML layouts is currently not supported in Android. Instead, fonts can only be specified using system-installed ones.

Alternative Solutions

To overcome this limitation, you have a few options:

• Manual Customization in Java Code: You can set the font of individual widgets manually using their unique IDs. While this method is accurate, it can become tedious and time-consuming when working with multiple widgets.
• Iterative Customization in Java Code: Instead of manually setting fonts, you can iterate through all widgets in Java and adjust their fonts accordingly. However, this approach can potentially impact performance, especially for complex layouts with numerous widgets.

Custom TextView Extension

To simplify the customization process, consider extending the TextView class as shown below:

TextViewPlus.java:

public class TextViewPlus extends TextView {
    ...

    private void setCustomFont(Context ctx, String asset) {
        Typeface tf = null;
        try {
            tf = Typeface.createFromAsset(ctx.getAssets(), asset);
        } catch (Exception e) {
            ...
        }
        setTypeface(tf);
    }
}

attrs.xml:

<declare-styleable name="TextViewPlus">
    <attr name="customFont" format="string"/>
</declare-styleable>

main.xml:

<LinearLayout ...>
    <com.example.TextViewPlus
        android:customFont="saxmono.ttf"
        ...
    />
</LinearLayout>

With this extension, you can specify custom fonts in XML layouts by setting the customFont attribute for each widget. The saxmono.ttf file should be placed in the assets folder.

Important Note

It's worth noting that using this method can lead to memory concerns. See chedabob's comment for more details.

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