利用ShapeDrawable自定义控件的shape

MainActivity如下:

package cn.testshape;
import android.os.Bundle;
import android.app.Activity;
/**
 * Demo描述:
 * 利用ShapeDrawable(xml形式)自定义控件的shape
 */
public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	}

}

main.xml如下:

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <Button
        android:layout_width="250dip"
        android:layout_height="50dip"
        android:text="测试自定义shape的使用"
        android:background="@drawable/background_selector"
        android:textColor="@drawable/textcolor_selector"
        android:layout_centerInParent="true"
        android:gravity="center"
      />

</RelativeLayout>

background_selector.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
     <item android:drawable="@drawable/pressed_shape" android:state_pressed="true"/>
     <item android:drawable="@drawable/default_shape"/>
</selector>

default_shape.xml如下:

<?xml version="1.0" encoding="utf-8"?>
    <!-- 定义矩形rectangle -->
<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle" >
    <!-- 定义边框颜色 -->
    <solid android:color="#d1d1d1" />
    <!-- 定义圆角弧度 -->
    <corners
        android:bottomLeftRadius="4dp"
        android:bottomRightRadius="4dp"
        android:topLeftRadius="4dp"
        android:topRightRadius="4dp"
    />

</shape>

pressed_shape.xml如下:

<?xml version="1.0" encoding="utf-8"?>
    <!-- 定义矩形rectangle -->
<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle" >
    <!-- 定义边框颜色 -->
    <solid android:color="#7bb3f8" />
    <!-- 定义圆角弧度 -->
    <corners
        android:bottomLeftRadius="4dp"
        android:bottomRightRadius="4dp"
        android:topLeftRadius="4dp"
        android:topRightRadius="4dp"
    />

</shape>

textcolor_selector.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
      <item android:color="#ffffff" android:state_pressed="true"/>
      <item android:color="#000000"/>
</selector>