Create an app on android studio that allows an user to convert temperature, weight or length from US unit of measure to metric units:

1. A spinner control that allows the user to select what conversion they want to perform (Temperature F->C ; Weight: lb->Kg; Length: miles->km)

2. Allow user to enter the desired value in an EditText - only allow numeric data entry; set the hint text accordingly - for example, if Weight is selected, the hintext should be Enter the weight in pounds.

3. A button to perform the calculation

4. A textview to display the result.