急求！！！！用Eclipse ADT 做android project，怎么在一个button上添加网站链接？

On your buttons, you should set OnClickListener, and to do some required actions you could see the example below:
设置OnClickListener监听事件：
    To Open a Map with Certain Location // 打开特定地点的地图，使用以下代码：

    mapButton.setOnClickListener(new OnClickListener(){
        @Override
        public void onClick(View v) {
            Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("geo:0,0?q=" + your-location-geo-address));
            startActivity(i);
        }
    });

    To call certain number // 呼叫某个号码：

    callButton.setOnClickListener(new OnClickListener(){
        @Override
        public void onClick(View v) {
            Intent i = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + telephone-number));
            startActivity(i);
        }
    });

    To open a website // 打开web站点：

    linkButton.setOnClickListener(new OnClickListener(){
        @Override
        public void onClick(View v) {
            Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(website-address));
            startActivity(i);
        }
    });

Change "location-address", "telephone-number", and "website-address" with your own String value. I hope this helps.   

 //使用你的字符串修改变量"location-address", "telephone-number", and "website-address"