Android OnClickListener复杂性

Question

I need to know, what is better in terms of complexity. Either to identity a separate onClick method from xml for each button like this:

android:onClick:"clickHandler"

and the java code:

public void clickHandler(View v){ 
         Button b = (Button) v;
         //do something for that button
      };

, or identify one method for all of the buttons, and separate them with if conditions.

Public void clickHandler(View v){
      Button b = (Button) v; 
      if(b.getText().equals("a")){
      }
         elseif(b.getText().equals("b")){
            }
       //And so on.
    }

I am not that good in calculating complexity and so on, but this question just irritates and I can't answer it. But what I understand, the first method increases the code lines a lot!

Answer 1

I would use a version of the second option. Create one handler, and then use a switch statement to determine which view received the event. It is code efficient and is not messy at all. Also, you don't need to list that attribute in xml... I personally think it is much easier to findViewById() in your activity and implement onClickListener. Then you can use each button's id in your switch statement.

Answer 2

I generally like the latter. Except I tend to do something that looks more like this:

public void onClick(View v){
   switch(v.getId()){
      case R.id.button_a:
        //do button a logic here
        break;
      case R.id.button_b:
        //do button b logic here
        break;
   }
}

Consider making your Activity implement View.OnClickListener than in your OnCreate() simple attach with findViewById(R.id.button_a).setOnClickListener(this);