Android studio button 按钮 四种绑定事件的方法

package com.geli_2.sujie.sujiegeili2testbutton;

import android.os.bundle;
import android.support.v7.app.appcompatactivity;
import android.view.view;
import android.widget.button;
import android.widget.toast;

public class mainactivity extends appcompatactivity implements view.onclicklistener
{

    private button mbtclick;
    private button mbtclick2;
    private button mbtclick3;
    private button mbtclick4;

    @override
    protected void oncreate(bundle savedinstancestate)
    {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_main);
        mbtclick = (button) findviewbyid(r.id.btntest1);            //1、fdv 找到button id
                                                                    // 2、 alt ctrl f 形成类全局field
        mbtclick.setonclicklistener(new view.onclicklistener()      //3、键入此行代码自动嵌入内部类方法
        {
            @override
            public void onclick(view v)
            {                                                       //4、 toast tab tab 调出toast 方法 以上为方法一
                toast.maketext(mainactivity.this, "hello world", toast.length_short).show();
            }
        });


        mbtclick2 = (button) findviewbyid(r.id.btnsample2);         //5、找出button 2 的 button id   fdv
        mbtclick2.setonclicklistener(new button_2_onclicklistener()); //9、实例化方法给button 绑定  以上是方法二
        mbtclick3 = (button) findviewbyid(r.id.btntry3);            //10、找出button 3 的 button id   fdv
        mbtclick3.setonclicklistener(this);                         //11、 this 表示 main acitivity
                                                                    //12 但是这里是方法参数是onclicklistener接口，此处 this alt enter 会在此方法上加上实现的接口
        mbtclick4 = (button) findviewbyid(r.id.btnexample4);        //5、找出button 4 的 button id   fdv


    }

    /**
     * called when a view has been clicked.
     *
     * @param v the view that was clicked.
     */
    @override
    public void onclick(view v)
    {
        //方法三
    }

    class button_2_onclicklistener implements view.onclicklistener  //6、设置一个 click 方法  命名后继承自 view
                                                                    // onclicklistener
                                                                    //7、 后在 继承 implements 上 alt + enter 来实现方法
    {

        /**
         * called when a view has been clicked.
         *
         * @param v the view that was clicked.
         */
        @override
        public void onclick(view v)
        {
            //方法二
        }
    }
    public void click(view view)
    {
        //方法四
    }

}