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changing font style in android: a comprehensive guide

this tutorial will guide you through the various methods of changing the font style in your android application using code. we'll cover different approaches, from simple text styling to more complex custom font implementations, including:

1. *using built-in text styles:* applying basic bold, italic, and monospace styles programmatically.
2. *using `typeface`:* loading and applying custom fonts from your `assets` folder.
3. *using `textappearance`:* defining font styles in xml and applying them to views.
4. *using `spannable`:* applying font styles to specific parts of a `textview`.
5. *using data binding (with `bindingadapter`):* a more modern and cleaner approach using data binding to handle font changes.
6. *leveraging `materialtextview`:* using material components for android to access pre-defined text appearances and theming options.

let's dive in!

*1. using built-in text styles*

android provides basic text styles through the `textview`'s `settypeface()` method. you can combine styles to achieve different effects (e.g., bold and italic).



*activity_main.xml (example):*



*explanation:*

`textview.settypeface(null, typeface.bold)`: sets the typeface to bold. the first argument `null` uses the default typeface.
`typeface.italic`: sets the typeface to italic.
`typeface.bold | typeface.italic`: combines both bold and italic styles using the bitwise or operator.
`typeface.monospace`: uses the system's monospace font.

*2. using `typeface` with custom fonts (from assets)*

this is the most common method for using custom fonts in your android app. you need to place your font files (e.g., `.ttf` or `.otf`) in the `assets` directory.

*steps:*

1. *create the `assets` directory:* if it doesn't already exist, create a folder named `assets` directly under your `app/src/main/` directory. (not under `res`!)
2. *copy your font file(s):* copy your `.ttf` o ...

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