How Can I Use Custom Fonts in Android XML Layouts Efficiently?

Custom Fonts and XML Layouts in Android

In Android, XML layouts provide a convenient way to define a user interface. However, they do not offer the ability to specify custom fonts to be used within widgets. While Java code can be employed to set the font for individual widgets, this approach is cumbersome and time-consuming.

Custom Font via Extended TextView

To address this limitation, we can extend the TextView class like:

TextViewPlus.java

public class TextViewPlus extends TextView {

    // Set custom font using asset file
    public boolean setCustomFont(Context ctx, String asset) {
        Typeface tf = null;
        try {
            tf = Typeface.createFromAsset(ctx.getAssets(), asset);
        } catch (Exception e) {
            return false;
        }
        setTypeface(tf);
        return true;
    }

}

XML Attribute Declaration

Next, we declare the custom font attribute in the 'attrs.xml' file:

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

XML Layout Utilization

In the 'main.xml' layout, we can now use the custom font within a TextViewPlus widget:

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

Update: Memory Concerns

It's important to note that this method raises concerns about memory usage. Each time 'setCustomFont' is called, a new Typeface object is created, which can lead to performance issues. For performance-critical applications, consider alternative approaches or use this solution judiciously.

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