Prompt Title: Google Assistant: Create Formulas.

Yes, I can help you develop an Android app that calculates the money spent on a journey based on fuel consumption, fuel price, and distance travelled. Here's a basic outline of the app's functionality:

1. Create a user interface with input fields for the fuel consumption, fuel price, and distance travelled.
2. Add a button to calculate the cost of the journey.
3. When the user clicks the button, the app should convert the fuel consumption from miles per gallon to liters per mile, calculate the total fuel consumption in liters, and calculate the total cost of the journey based on the fuel consumption and fuel price.
4. The app should display the result in pounds.

To create the app, we'll need to use a programming language such as Java or Kotlin, and a development environment such as Android Studio. Here's some sample code that you can use to get started:

1. Create a new Android project in Android Studio.
2. In the layout XML file for your main activity, add three EditText views to capture the fuel consumption, fuel price, and distance travelled. Also, add a Button view to trigger the calculation. Your layout should look something like this:

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<LinearLayout
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <EditText
        android:id="@+id/fuel_consumption_edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Fuel consumption (mpg UK)"/>

    <EditText
        android:id="@+id/fuel_price_edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Fuel price (£/liter)"/>

    <EditText
        android:id="@+id/distance_edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Distance travelled (miles)"/>

    <Button
        android:id="@+id/calculate_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Calculate"/>
        
</LinearLayout>

3. In the MainActivity class, add a click listener to the Calculate button. In the listener, get the values from the EditText views, convert the fuel consumption from miles per gallon to liters per mile, calculate the total fuel consumption in liters, and calculate the total cost of the journey based on the fuel consumption and fuel price. Finally, display the result in a TextView view. Your code should look something like this:

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public class MainActivity extends AppCompatActivity {

    private EditText fuelConsumptionEditText;
    private EditText fuelPriceEditText;
    private EditText distanceEditText;
    private TextView resultTextView;
    private Button calculateButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        fuelConsumptionEditText = findViewById(R.id.fuel_consumption_edit_text);
        fuelPriceEditText = findViewById(R.id.fuel_price_edit_text);
        distanceEditText = findViewById(R.id.distance_edit_text);
        resultTextView = findViewById(R.id.result_text_view);
        calculateButton = findViewById(R.id.calculate_button);

        calculateButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Get values from EditText views
                double fuelConsumption = Double.parseDouble(fuelConsumptionEditText.getText().toString());
                double fuelPrice = Double.parseDouble(fuelPriceEditText.getText().toString());
                double distance = Double.parseDouble(distanceEditText.getText().toString());

                // Convert fuel consumption from miles per gallon to liters per mile
                double litersPerMile = 4.54609 / fuelConsumption;

                // Calculate