自定义 View

   public class CustomTextView extends TextView {

        private static final String TAG = CustomTextView.class.getSimpleName();

        public CustomTextView(Context context) {
            super(context);
        }

        public CustomTextView(Context context, AttributeSet attrs) {
            this(context, attrs, R.attr.CustomizeStyle);
        }

        public CustomTextView(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);

            /**
             * AttributeSet set ：XML 中定义的属性值，可能为 null；
             *
             * int[] attrs ：目标属性值；
             *
             * dint defStyleAttr ：在当前主题中有一个引用指向样式文件，这个样式文件将 TypedArray
             * 设置默认值。如果此参数为 0 则表示不进行默认值设置。
             *
             * int defStyleRes ：默认的样式资源文件，只有当 defStyleAttr 为 0 或者无法在对应的主题下找到资源文件时才起作用。
             * 如果此参数为 0 则表示不进行默认设置。
             */
            TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CustomTextView , defStyle, R.style.DefaultCustomizeStyle);
    //        TypedArray a = mContext.getTheme().obtainStyledAttributes(attrs,  R.styleable.CustomTextView , R.attr.CustomizeStyle, R.style.DefaultCustomizeStyle);
            String one = a.getString(R.styleable.Customize_attr_one);
            String two = a.getString(R.styleable.Customize_attr_two);
            String three = a.getString(R.styleable.Customize_attr_three);
            String four = a.getString(R.styleable.Customize_attr_four);
            Log.i(TAG, "one:" + one);
            Log.i(TAG, "two:" + two);
            Log.i(TAG, "three:" + three);
            Log.i(TAG, "four:" + four);
            a.recycle();
        }
    }

attrs.xml文件

    <?xml version="1.0" encoding="utf-8"?>
    <resources>

        <declare-styleable name="CustomTextView">
            <attr name="attr_one" format="string" />
            <attr name="attr_two" format="string" />
            <attr name="attr_three" format="string" />
            <attr name="attr_four" format="string" />
        </declare-styleable>

        <attr name="CustomizeStyle" format="reference" />

    </resources>

styles.xml文件

    <resources>

        <style name="AppBaseTheme" parent="android:Theme.Light">
        </style>

        <!-- Application theme. -->
        <style name="AppTheme" parent="AppBaseTheme">

            <!-- All customizations that are NOT specific to a particular API-level can go here. -->
            <item name="attr_one">attr one from theme</item>
            <item name="attr_two">attr two from theme</item>
            <item name="attr_three">attr three from theme</item>
            <item name="CustomizeStyle">@style/CustomizeStyleInTheme</item>
        </style>

        <style name="CustomizeStyleInTheme">
            <item name="attr_one">attr one from theme reference</item>
            <item name="attr_two">attr two from theme reference</item>
            <item name="attr_three">attr three from theme reference</item>
        </style>

        <style name="ThroughStyle">
            <item name="attr_one">attr one from style</item>
            <item name="attr_two">attr two from style</item>
        </style>
    
        <style name="DefaultCustomizeStyle">
            <item name="attr_one">attr one from defalut style res</item>
            <item name="attr_two">attr two from defalut style res</item>
            <item name="attr_three">attr three from defalut style res</item>
        </style>

    </resources>

在activity_main.xml中添加该试图

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:ad="http://schemas.android.com/apk/res-auto" <!--自定义类型-->
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity" >

        <com.example.myapplication.CustomTextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            ad:attr_one="attr one in xml"
            style="@style/ThroughStyle"
            android:text="@string/hello_world" />

    </RelativeLayout>