在res目录下的drawable-mdpi建立xml文件shape.xml,如下图所示：

shape.xml

  
     
     
     
     
     
        

 

main.xml

在android:background="@drawable/shape"就使用了shape.xml资源

      

strings.xml

  
    Hello World, RoundButtonDemoActivity! 
    RoundButtonDemo 

RoundButtonDemoActivity.java

package com.android.RoundButtonDemo.activity;  
 
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 RoundButtonDemoActivity extends Activity {  
    Button roundButton;  
    @Override 
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
          
        roundButton=(Button)findViewById(R.id.roundButton);  
      //使用匿名类注册Button事件  
        roundButton.setOnClickListener(new OnClickListener()  
      {       
            public void onClick(View v)  
            {  
                Toast.makeText(RoundButtonDemoActivity.this, "你点击了圆角按钮",Toast.LENGTH_LONG).show();  
            }  
        });  
    }  
}

效果图：