Passing a double value through to a different class in Android Java

You're not actually placing your doubles into your Intent

Intent yourInent = new Intent(thisActivity.this, nextActivity.class);
Bundle b = new Bundle();
b.putDouble("key", doubleVal);
yourIntent.putExtras(b);
startActivity(yourIntent);

Then, get it in your next Activity:

Bundle b = getIntent().getExtras();
double result = b.getDouble("key");

You can try by this way

double a, b;
Intent i = new Intent(classA.this, classB.class);

Bundle params = new Bundle();
params.putDouble("doubleA", a);
params.putDouble("doubleB", b);
i.putExtras(params);
startActivity(i);

At other side you need something like this

double a, b;
// Get Params from intent
Intent it = getIntent();        
if (it != null)
{
    Bundle params = it.getExtras();
    if  (params != null)
    {
         a = params.getDouble("doubleA");
         b = params.getDouble("doubleB");               
     }
}