Android按钮单击事件的五种实现方式

1. 匿名内部类作为事件监听器

   public class mainactivity extends activity {
   
    private button button;
   
       @override
       protected void oncreate(bundle savedinstancestate) {
           super.oncreate(savedinstancestate);
           setcontentview(r.layout.activity_main);
           button = (button) findviewbyid(r.id.button1);
           button.setonclicklistener(new onclicklistener() {
            @override
            public void onclick(view v) {
                system.out.println("匿名内部类作为事件监听器");
            }
        });
   
       }
   
   }

2. 内部类作为事件监听器

   public class mainactivity extends activity {
   
    private button button;
   
       @override
       protected void oncreate(bundle savedinstancestate) {
           super.oncreate(savedinstancestate);
           setcontentview(r.layout.activity_main);
           button = (button) findviewbyid(r.id.button1);
           button.setonclicklistener(new buttononclicklistener());
       }
   
       class buttononclicklistener implements onclicklistener{
        @override
        public void onclick(view v) {
            system.out.println("内部类作为事件监听器");
        }
       }
   
   }

3. activity本身作为事件监听器

   public class mainactivity extends activity implements onclicklistener{
   
    private button button;
   
       @override
       protected void oncreate(bundle savedinstancestate) {
           super.oncreate(savedinstancestate);
           setcontentview(r.layout.activity_main);
           button = (button) findviewbyid(r.id.button1);
           button.setonclicklistener(this);
       }
   
       @override
       public void onclick(view v) {
        system.out.println("activity本身作为事件监听器");
       }
   
   }

4. 外部类作为事件监听器

   public class mainactivity extends activity {
   
    private button button;
   
       @override
       protected void oncreate(bundle savedinstancestate) {
           super.oncreate(savedinstancestate);
           setcontentview(r.layout.activity_main);
           button = (button) findviewbyid(r.id.button1);
           button.setonclicklistener(new buttononclicklistener());
       }
   
   }
   class buttononclicklistener implements onclicklistener {
   
    @override
    public void onclick(view v) {
        system.out.println("外部类作为事件监听器");
    }
   
   }

5. 将事件处理方法直接绑定到标签

   <button
               android:id="@+id/button1"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:text="点击事件"
               android:onclick="onclick" />

   public class mainactivity extends activity {
   
       @override
       protected void oncreate(bundle savedinstancestate) {
           super.oncreate(savedinstancestate);
           setcontentview(r.layout.activity_main);
       }
   
       public void onclick(view v){
        system.out.println("将事件处理方法直接绑定到标签");
       }
   
   }