Android-Button按钮Demo

package com.lxt008;

import com.lxt008.R;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class Activity01 extends Activity
{
    //声明按钮
    Button m_Button1,m_Button2;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        //取得Button对象
        m_Button1=(Button)findViewById(R.id.Button1);
        m_Button2=(Button)findViewById(R.id.Button2);
        
        //设置按钮上显示的文字
        m_Button1.setText("开始");
        m_Button2.setText("退出");
        
        //设置按钮的宽度
        m_Button1.setWidth(150);
        m_Button2.setWidth(100);
        
        //设置文字的颜色
        m_Button1.setTextColor(Color.GREEN);
        m_Button2.setTextColor(Color.RED);
        
        //设置文字的大小尺寸
        m_Button1.setTextSize(30);
        m_Button2.setTextSize(20);
        
        //m_Button1.setBackgroundColor(Color.BLUE);
        
        //设置按钮的事件监听
        m_Button1.setOnClickListener(new Button.OnClickListener(){
            public void onClick(View v)
            {
                //处理按钮事件
                //产生一个Toast
                //m_Button1.getText()得到按钮显示的内容
                Toast toast = Toast.makeText(Activity01.this, "你点击了“"+m_Button1.getText()+"”按钮！", Toast.LENGTH_LONG);
                //设置toast显示的位置
                toast.setGravity(Gravity.TOP, 0, 150);
                //显示该Toast
                toast.show();
            }
        });
        
        m_Button2.setOnClickListener(new Button.OnClickListener(){
            public void onClick(View v)
            {
                //处理按钮事件
                Activity01.this.finish();
            }
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <TextView  
    android:id="@+id/TextView1"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
    <Button
      android:id="@+id/Button1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
    >
    </Button>
    <Button
      android:id="@+id/Button2"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
    >
    </Button>
</LinearLayout>