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：

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