Android中button实现onclicklistener事件的两种方式

package com.demos;
import android.app.activity;
import android.os.bundle;
import android.view.view;
import android.view.view.onclicklistener;
import android.widget.button;
public class getscreenactivity extends activity {
private button firstbtn = null;
private button secbtn = null;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.main);
firstbtn = (button) findviewbyid(r.id.firstbtn);
secbtn = (button) findviewbyid(r.id.secbtn);
firstbtn.setonclicklistener(listener);
secbtn.setonclicklistener(new onclicklistener() {
@override
public void onclick(view v) {
// todo auto-generated method stub
}
});
}
private onclicklistener listener = new onclicklistener(){
@override
public void onclick(view view) {
}
};
}