android基础6——设置圆角按钮

圆角的按钮实现扁平化的UI很有美感，但是实现起来也不算太难。

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

shape.xml

<?xml version="1.0" encoding="UTF-8"?> 
<shape 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shape="rectangle"> 
    <!-- 填充的颜色 --> 
    <solid android:color="#FFFFFF" /> 
    <!-- 设置按钮的四个角为弧形 --> 
    <!-- android:radius 弧形的半径 --> 
    <corners android:radius="5dip" /> 
      
<!-- padding：Button里面的文字与Button边界的间隔 --> 
<padding 
   android:left="10dp" 
   android:top="10dp" 
   android:right="10dp" 
   android:bottom="10dp" 
/> 
</shape> 

main.xml

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

<?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:layout_width="fill_parent"   
    android:layout_height="wrap_content"   
    android:text="@string/hello" 
    />   
<Button   
    android:id="@+id/roundButton" 
    android:text=" 圆角按钮 " 
    android:layout_width="wrap_content"   
    android:layout_height="wrap_content"   
    android:background="@drawable/shape" 
    /> 
</LinearLayout> 

strings.xml

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
    <string name="hello">Hello World, RoundButtonDemoActivity!</string> 
    <string name="app_name">RoundButtonDemo</string> 
</resources> 

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：