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One way to incorporate a formatter for displaying numbers with one decimal place in an Android application is by using the DecimalFormat class.

Here is an example code snippet for formatting a number to one decimal place:

double myNumber = 15.6789;
DecimalFormat decimalFormat = new DecimalFormat("#.#");
String formattedNumber = decimalFormat.format(myNumber);

In this example, the DecimalFormat object is created using the pattern "#.#", which specifies that the number should be formatted with one decimal place. The format() method is then called on the DecimalFormat object to apply the formatting to the input number. The resulting formatted number is stored as a string in the formattedNumber variable.

Once you have the formatted number as a string, you can display it in your Android application as needed, such as by setting it as the text of a TextView widget.