2、自定义TextButton.java文件，继承Button控件
public class TextButton extends Button{
public TextButton(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.mybutton);
this.setTextSize(a.getDimension(R.styleable.mybutton_textSize,50));
this.setTextColor(a.getColor(R.styleable.mybutton_textColor,0x7f04008d));
a.recycle();
}
}
①TypedArray实例是个属性的容器，context.obtainStyledAttributes()方法返回得到。AttributeSet是节点的属性集合，在本例中是<com.example.test.TextButton节点中的属性集合。
②a.getDimension(R.styleable.mybutton_textSize,50)获取自定义的TextSize大小为50sp
a.getColor(R.styleable.mybutton_textColor,0x7f04008d)获取自定义的TextColor为蓝色，0x7f04008d是R文件里的int值
③a.recycle();必不可少，Give back a previously retrieved StyledAttributes, for later re-use.