Android : Way of Using setOnClickListener for an View

I'm going to use most common View Button for Setting onClick event :

Method One:- One Listener for One button:

    Button btn = (Button) findViewById(R.id.myButton); 
    btn. SetOnClickListener (new View.OnClickListener() { 
    Public void onClick(View v) the { 
      // Do Something 
     } 
    }); 

Method Two:- Share One Listener with Multiple buttons:

  Button btn = (Button)findViewById(R.id.mybutton); 
  Button btn2 = (Button)findViewById(R.id.mybutton2); 
  btn.setOnClickListener(handler); 
  btn2.setOnClickListener(handler); 
  View.OnClickListener handler = View.OnClickListener() { 
  Public void onClick(View v) the { 
  switch(v.getId()) { 
  case R.id.mybutton: 
  // Do Something 
  break; 
  case R.id.mybutton2: 
  // Do Something 
  break; 
    } 
  }
  

Method Three:- Clicklistener bundled with an XML the layout of the Views element, Listener methods defined in the program with a View type of parameters as:

Buttontst.Xml :



java code::

  Button btn = (Button) findViewById(R.id.mybutton);
  public void mybuttonlistener(View target){
   //do something
  }