Android handle onClick event ( two ways )

I recently have started to practice pure android apps , and now I am going to show how to register onclick events of controls in two ways. First way is our old java way , to associate separate onclick listener to each control like this :

  btn_1.setOnClickListener(new OnClickListener()
        {
            public void onClick(View v)
            {
            input_screen.append("0");
            }
        });

which is good but not best way.

Second way is to define your onClick method in the current context ( class ) and while handling the onClick events just give "this" ( context ) to the setOnClickListener method of controls and apply cases inside your onClick method, like given below :

btn_num_0.setOnClickListener(this);
btn_num_1.setOnClickListener(this);

public void onClick(View v) {
      // TODO Auto-generated method stub
      final int id = v.getId();
       switch (id) {
       case R.id.btn_num_0:
            // your logic here
           break;
       case R.id.btn_num_1:
           // your logic here
           break;
       // even more buttons here
       }
    }

So these are the two ways for registering events for controls.