1.在res/values文件夹里创建attr.xml文件

attr.xml

<?xml version="1.0" encoding="utf-8"?>
<resources><declare-styleable name="mybutton"><attr name="myText" format="string" /><attr name="myTextColor" format="color" /><attr name="myTextSize" format="dimension" /></declare-styleable></resources>

2.在style.xml里添加此项：

<style name="mystyle"><item name="com.example.main:myTextSize">6sp</item>
</style>

3.在使用自定义view的xml文件里添加此项：

xmlns:mybutton="http://schemas.android.com/apk/res-auto"<com.example.main.mybuttonstyle="@style/mystyle"mybutton:myText="adsf"mybutton:myTextColor="#FF0000"/>

4.修改控件的构造函数：

public MyButton(Context context, AttributeSet attrs) {super(context, attrs);TypedArray a = context.getTheme().obtainStyledAttributes(attrs,R.styleable.mybutton, 0, 0);String mText = a.getString(R.styleable.mybutton_myText);int mTextColor = a.getColor(R.styleable.mybutton_myTextColor, R.color.red);float mTextSize = a.getDimension(R.styleable.mybutton_myTextSize, 30f);txt.setText(mText);txt.setTextColor(mTextColor);txt.setTextSize(mTextSize);
}