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To write an emoji in an XML layout file using an escaped unicode format, follow these steps:

1. Determine the unicode value of the emoji you want to use. You can find this value by searching for your desired emoji and finding its unicode value online, or by using the Unicode Character Table.

2. In your XML layout file, add a TextView or EditText element where you want to insert the emoji.

3. In the text attribute of the TextView or EditText element, insert the escaped unicode value of the emoji, using the "\u" prefix followed by the four-digit hexadecimal number representing the unicode value.

For example, to insert the heart emoji (❤️), the unicode value is U+2764, which is equivalent to the hexadecimal value 0x2764. To write this emoji in an XML layout file, you would use the following code:

<textview android:id="@+id/textview_heart_emoji" android:text="\u2764" ...=""/>

This will display the heart emoji in your app.