How Can I Use Custom Fonts in Android XML Layouts?

Custom Fonts and XML Layouts (Android)

In Android, using XML files to define GUI layouts allows for efficient and flexible development. However, one common challenge is the inability to specify custom fonts in these files, limiting widgets to the use of system-installed fonts.

To overcome this limitation, consider creating a custom TextView subclass called TextViewPlus. This subclass allows you to set custom fonts through a style attribute.

TextViewPlus.java:

public class TextViewPlus extends TextView {
    ...
    public boolean setCustomFont(Context ctx, String asset) {
        ...
        setTypeface(tf);  
        return true;
    }
    ...
}

attrs.xml:

<!-- Declares the custom style attribute and its format -->
<declare-styleable name="TextViewPlus">
    <attr name="customFont" format="string"/>
</declare-styleable>    

main.xml:

<!-- Example of using the TextViewPlus subclass with a custom font -->
<LinearLayout ...>
    <com.example.TextViewPlus
        android:id="@+id/textViewPlus1"
        ...
        foo:customFont="saxmono.ttf">
    </com.example.TextViewPlus>
</LinearLayout>

Ensure that the corresponding custom font file (e.g., "saxmono.ttf") is placed in the application's assets folder.

By defining custom fonts in XML layouts, you gain greater control over the appearance and branding of your widgets. This method allows you to specify a consistent look and feel for your application without manually changing the font of each widget in Java code.

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