Button创建及消息处理

package com.example.buttonapp;

import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;

public class MainActivity extends Activity {

OnClickListener listener1=null;
OnClickListener listener2=null;
Button button1;
Button button2;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
listener1=new OnClickListener(){
public void onClick(View v){
setTitle("Button1点击后不见了！");
button1.setVisibility(View.INVISIBLE);
button2.setVisibility(View.VISIBLE);
}
};

listener2=new OnClickListener(){
public void onClick(View v){
setTitle("button2点击后不见了！");
button1.setVisibility(View.VISIBLE);
button2.setVisibility(View.INVISIBLE);
}
};

setContentView(R.layout.activity_main);

button1=(Button)findViewById(R.id.button1);
button1.setOnClickListener(listener1);
button2=(Button)findViewById(R.id.button2);
button2.setOnClickListener(listener2);

}

}