android基础笔记——用一个监听器，实现多个按钮的监听

Button button1 = (Button)findViewById(R.id.btn1);
Button button2 = (Button)findViewById(R.id.btn2);
Button button3 = (Button)findViewById(R.id.btn3);
button1.setOnClickListener(this);
button1.setTag(1);
button2.setOnClickListener(this);
button2.setTag(2);
button3.setOnClickListener(this);
button3.setTag(3);

public void onClick(View v){
int tag = (Integer) v.getTag();
switch(tag){
case 1:

break;
case 2:

break;
case 3:

break;
default :
break;
}

}