How do I instantiate a class in android which is also an activity?

Question

In android, how can I create a constructor for a class which is also an Activity?

My problem is,

I want to have two activity cl

Answer 1

Activities can't have user defined constructors, only the default one; they can be instantiated only indirectly via intent creation. If you need to pass data between activities, do it by putting extras to bundles, for example:

bundle.putInt("dist",dist);

then you can extract the data from bundle by

int dist = bundle.getInt("dist");

Put extras before starting the activity:

Intent i = new Intent(this, CalculateFare.class);
Bundle b = new Bundle();

b.putInt("dist",dist);
i.putExtras(b);
startActivity(i);

and then read the extras in the onCreate method:

public void onCreate(Bundle savedInstanceState)
{
   super.onCreate(savedInstanceState);

   Bundle b = getIntent().getExtras();
   int dist;

   if (b != null)
   {
      dist = b.getInt("dist");
   }
}