使用微调器更改变量的值（Android Studio）

Question

I've been searching for awhile but I can't seem to find a solution to my problem. I'm still pretty new to programming. I'm trying to understand how to change the value of a single variable using a spinner. Ideally the user should select "Male" or "Female" from the spinner and receive different outputs based on their selection.

   //Two
   float Male=(float) (weight*1.9);
   float Female=(float) (weight*1.5)`

Answer 1

you will have to work with listeners

Here is the tutorial from java which will help you to understand them better https://docs.oracle.com/javase/tutorial/uiswing/events/intro.html

after that you can look into the documentation from android developers studio they also give good examples https://developer.android.com/guide/topics/ui/controls/spinner.html

Answer 2

You can bind your spinner with on selected listener.

spinnerObj.setOnItemSelectedListener(new OnItemSelectedListener() { 
@Override public void onItemSelected(AdapterView<?> adapter, View v,int position, long id) 
{ 
if(position == 0)
//Male 
else
//Female
}

 @Override public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub } }
);