How exactly does the android:onClick XML attribute differ from setOnClickListener?

Question

From that I\'ve read you can assign a onClick handler to a button in two ways.

Using the android:onClick XML attribute where you just use t

Answer 1

   Add Button in xml and give onclick attribute name that is the name of Method.
   
   


    Button btnAdd = (Button) findViewById(R.id.mybutton); btnAdd.setOnClickListener(new View.OnClickListener() {
   @Override
    public void onClick(View v) {
      addNumber(v);
    }
    });

  Private void addNumber(View v){
  //Logic implement 
    switch (v.getId()) {
    case R.id.btnAdd :
        break;
     default:
        break;
    }}