Android开发学习笔记：圆角的Button

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：