package com.android.study;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

    /** Called when the activity is first created. */

    private Button btn1;

    private Button btn2;

    private Button btn3;

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        btn1=(Button)findViewById(R.id.btn1);

        btn1.setOnClickListener(new ButtonClick()); //给Button注册一个事件

   //第二种方式

        btn2=(Button)findViewById(R.id.btn2);

        btn2.setOnClickListener(new OnClickListener()

        {

        public void onClick(View v)

        {

        Toast.makeText(MainActivity.this, "第二种触发按钮Button方式",Toast.LENGTH_LONG).show();

        System.out.println("第二种触发按钮Button方式");

        }

        });//内部匿名类,实现了接口的对象

        btn3=(Button)findViewById(R.id.btn3);

        btn3.setOnClickListener(listener);

    }

  //第三种方式

    private OnClickListener listener=new OnClickListener()

    {

    public void onClick(View v){

    switch(v.getId())

    {

    case R.id.btn1:

    break;

    case R.id.btn2:

    break;

    case R.id.btn3:

    Toast.makeText(MainActivity.this, "第三种触发按钮Button方式",Toast.LENGTH_LONG).show();

    System.out.println("第三种触发按钮Button方式");

    break;

    }

    }

    };

}