package com.example.vmpdump.firstapp;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

     Button bt1=null;

     Button bt2=null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

         bt1=findViewById(R.id.bt1);

         bt2=findViewById(R.id.bt2);

        bt1.setOnClickListener(listener);

        bt2.setOnClickListener(listener);

    }

private View.OnClickListener listener = new View.OnClickListener() {

    @Override

    public void onClick(View view) {

Button bt=(Button)view;

      switch (bt.getId())

      {

          case R.id.bt1 :

              Toast.makeText(MainActivity.this,"11",Toast.LENGTH_SHORT).show();break;

          case R.id.bt2 :

              Toast.makeText(MainActivity.this,"22",Toast.LENGTH_SHORT).show();break;

      }

    }

};//这里一定要有分号...这里使new 了一个类虽然里面有很多参数...但是后面是要加分号的 这个编译器不提示...骚

}