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老司机带你重构Android的v4包的部分源码

2018-02-22 800

版权声明：本文为博主原创文章，未经博主允许不得转载。https://www.jianshu.com/p/a08d754944c4

转载请标明出处：
https://www.jianshu.com/p/a08d754944c4
本文出自 AWeiLoveAndroid的博客

【前言】过年回家忙着干活，忙着给亲戚的孩子发红包，好累，忙里偷闲打开studio看了一下v4包，之前看过几个类，这次是每个类都看了一下，原来Android的v4包的源码也有一些是写的不是那么友好的，还有很多改善空间。

下面就拿其中的android.support.v4.text这个包里面的 TextUtilsCompat 和 TextUtilsCompatJellybeanMr1 这两个类来做一个具体讲解。

本文源码同步发布在github，详情请点击 https://github.com/AweiLoveAndroid/refactor-android-support-v4

一、首先看一下Androidv4包下面的 TextUtilsCompat 和 TextUtilsCompatJellybeanMr1 源码：

（一）TextUtilsCompat 源码：
public final class TextUtilsCompat {
    private static class TextUtilsCompatImpl {
        TextUtilsCompatImpl() {
        }

        @NonNull
        public String htmlEncode(@NonNull String s) {
            StringBuilder sb = new StringBuilder();
            char c;
            for (int i = 0; i < s.length(); i++) {
                c = s.charAt(i);
                switch (c) {
                    case '<':
                        sb.append("&lt;"); //$NON-NLS-1$
                        break;
                    case '>':
                        sb.append("&gt;"); //$NON-NLS-1$
                        break;
                    case '&':
                        sb.append("&amp;"); //$NON-NLS-1$
                        break;
                    case '\'':
                        //http://www.w3.org/TR/xhtml1
                        // The named character reference &apos; (the apostrophe, U+0027) was
                        // introduced in XML 1.0 but does not appear in HTML. Authors should
                        // therefore use &#39; instead of &apos; to work as expected in HTML 4
                        // user agents.
                        sb.append("&#39;"); //$NON-NLS-1$
                        break;
                    case '"':
                        sb.append("&quot;"); //$NON-NLS-1$
                        break;
                    default:
                        sb.append(c);
                }
            }
            return sb.toString();
        }

        public int getLayoutDirectionFromLocale(@Nullable Locale locale) {
            if (locale != null && !locale.equals(ROOT)) {
                final String scriptSubtag = ICUCompat.maximizeAndGetScript(locale);
                if (scriptSubtag == null) return getLayoutDirectionFromFirstChar(locale);

                // This is intentionally limited to Arabic and Hebrew scripts, since older
                // versions of Android platform only considered those scripts to be right-to-left.
                if (scriptSubtag.equalsIgnoreCase(ARAB_SCRIPT_SUBTAG) ||
                        scriptSubtag.equalsIgnoreCase(HEBR_SCRIPT_SUBTAG)) {
                    return ViewCompat.LAYOUT_DIRECTION_RTL;
                }
            }
            return ViewCompat.LAYOUT_DIRECTION_LTR;
        }

        /**
         * Fallback algorithm to detect the locale direction. Rely on the first char of the
         * localized locale name. This will not work if the localized locale name is in English
         * (this is the case for ICU 4.4 and "Urdu" script)
         *
         * @param locale
         * @return the layout direction. This may be one of:
         * {@link ViewCompat#LAYOUT_DIRECTION_LTR} or
         * {@link ViewCompat#LAYOUT_DIRECTION_RTL}.
         *
         * Be careful: this code will need to be updated when vertical scripts will be supported
         */
        private static int getLayoutDirectionFromFirstChar(@NonNull Locale locale) {
            switch(Character.getDirectionality(locale.getDisplayName(locale).charAt(0))) {
                case Character.DIRECTIONALITY_RIGHT_TO_LEFT:
                case Character.DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC:
                    return ViewCompat.LAYOUT_DIRECTION_RTL;

                case Character.DIRECTIONALITY_LEFT_TO_RIGHT:
                default:
                    return ViewCompat.LAYOUT_DIRECTION_LTR;
            }
        }
    }

    private static class TextUtilsCompatJellybeanMr1Impl extends TextUtilsCompatImpl {
        TextUtilsCompatJellybeanMr1Impl() {
        }

        @Override
        @NonNull
        public String htmlEncode(@NonNull String s) {
            return TextUtilsCompatJellybeanMr1.htmlEncode(s);
        }

        @Override
        public int getLayoutDirectionFromLocale(@Nullable Locale locale) {
            return TextUtilsCompatJellybeanMr1.getLayoutDirectionFromLocale(locale);
        }
    }

    private static final TextUtilsCompatImpl IMPL;
    static {
        final int version = Build.VERSION.SDK_INT;
        if (version >= 17) { // JellyBean MR1
            IMPL = new TextUtilsCompatJellybeanMr1Impl();
        } else {
            IMPL = new TextUtilsCompatImpl();
        }
    }

    /**
     * Html-encode the string.
     * @param s the string to be encoded
     * @return the encoded string
     */
    @NonNull
    public static String htmlEncode(@NonNull String s) {
        return IMPL.htmlEncode(s);
    }

    /**
     * Return the layout direction for a given Locale
     *
     * @param locale the Locale for which we want the layout direction. Can be null.
     * @return the layout direction. This may be one of:
     * {@link ViewCompat#LAYOUT_DIRECTION_LTR} or
     * {@link ViewCompat#LAYOUT_DIRECTION_RTL}.
     *
     * Be careful: this code will need to be updated when vertical scripts will be supported
     */
    public static int getLayoutDirectionFromLocale(@Nullable Locale locale) {
        return IMPL.getLayoutDirectionFromLocale(locale);
    }

    public static final Locale ROOT = new Locale("", "");

    static String ARAB_SCRIPT_SUBTAG = "Arab";
    static String HEBR_SCRIPT_SUBTAG = "Hebr";

    private TextUtilsCompat() {}
}
（二）TextUtilsCompatJellybeanMr1 源码：
/**
 * Jellybean MR1 - specific TextUtils API access.
 */
@RequiresApi(17)
@TargetApi(17)
class TextUtilsCompatJellybeanMr1 {
    @NonNull
    public static String htmlEncode(@NonNull String s) {
        return TextUtils.htmlEncode(s);
    }

    public static int getLayoutDirectionFromLocale(@Nullable Locale locale) {
        return TextUtils.getLayoutDirectionFromLocale(locale);
    }
}

二、分析一下以上源码的一些需要改进的问题（仅个人理解，如有不同意见，欢迎提出）：

通过以上源码来看，看起来确实有点不是很舒服。

（一）排列顺序有点乱，我格式化了一下，如下，看的稍微清楚了一些：
/**
 * 格式化之后的TextUtilsCompat类
 */
public class TextUtilsCompat {

    private static final TextUtilsCompatImpl IMPL;

    public static final Locale ROOT = new Locale("", "");

    static String ARAB_SCRIPT_SUBTAG = "Arab";
    static String HEBR_SCRIPT_SUBTAG = "Hebr";

    private TextUtilsCompat() {}

    static {
        final int version = Build.VERSION.SDK_INT;
        if (version >= 17) { // JellyBean MR1
            IMPL = new TextUtilsCompatJellybeanMr1Impl();
        } else {
            IMPL = new TextUtilsCompatImpl();
        }
    }

    /**
     * Html-encode the string.
     * @param s the string to be encoded
     * @return the encoded string
     */
    @NonNull
    public static String htmlEncode(@NonNull String s) {
        return IMPL.htmlEncode(s);
    }

    /**
     * Return the layout direction for a given Locale
     *
     * @param locale the Locale for which we want the layout direction. Can be null.
     * @return the layout direction. This may be one of:
     * {@link ViewCompat#LAYOUT_DIRECTION_LTR} or
     * {@link ViewCompat#LAYOUT_DIRECTION_RTL}.
     *
     * Be careful: this code will need to be updated when vertical scripts will be supported
     */
    public static int getLayoutDirectionFromLocale(@Nullable Locale locale) {
        return IMPL.getLayoutDirectionFromLocale(locale);
    }


    private static class TextUtilsCompatImpl {

        TextUtilsCompatImpl() {}

        @NonNull
        public String htmlEncode(@NonNull String s) {
            StringBuilder sb = new StringBuilder();
            char c;
            for (int i = 0; i < s.length(); i++) {
                c = s.charAt(i);
                switch (c) {
                    case '<':
                        sb.append("&lt;"); //$NON-NLS-1$
                        break;
                    case '>':
                        sb.append("&gt;"); //$NON-NLS-1$
                        break;
                    case '&':
                        sb.append("&amp;"); //$NON-NLS-1$
                        break;
                    case '\'':
                        //http://www.w3.org/TR/xhtml1
                        // The named character reference &apos; (the apostrophe, U+0027) was
                        // introduced in XML 1.0 but does not appear in HTML. Authors should
                        // therefore use &#39; instead of &apos; to work as expected in HTML 4
                        // user agents.
                        sb.append("&#39;"); //$NON-NLS-1$
                        break;
                    case '"':
                        sb.append("&quot;"); //$NON-NLS-1$
                        break;
                    default:
                        sb.append(c);
                }
            }
            return sb.toString();
        }

        public int getLayoutDirectionFromLocale(@Nullable Locale locale) {
            if (locale != null && !locale.equals(ROOT)) {
                final String scriptSubtag = ICUCompat.maximizeAndGetScript(locale);
                if (scriptSubtag == null) {
                    return getLayoutDirectionFromFirstChar(locale);
                }

                // This is intentionally limited to Arabic and Hebrew scripts, since older
                // versions of Android platform only considered those scripts to be right-to-left.
                if (scriptSubtag.equalsIgnoreCase(ARAB_SCRIPT_SUBTAG) ||
                        scriptSubtag.equalsIgnoreCase(HEBR_SCRIPT_SUBTAG)) {
                    return ViewCompat.LAYOUT_DIRECTION_RTL;
                }
            }
            return ViewCompat.LAYOUT_DIRECTION_LTR;
        }

        /**
         * Fallback algorithm to detect the locale direction. Rely on the first char of the
         * localized locale name. This will not work if the localized locale name is in English
         * (this is the case for ICU 4.4 and "Urdu" script)
         *
         * @param locale
         * @return the layout direction. This may be one of:
         * {@link ViewCompat#LAYOUT_DIRECTION_LTR} or
         * {@link ViewCompat#LAYOUT_DIRECTION_RTL}.
         *
         * Be careful: this code will need to be updated when vertical scripts will be supported
         */
        private static int getLayoutDirectionFromFirstChar(@NonNull Locale locale) {
            switch(Character.getDirectionality(locale.getDisplayName(locale).charAt(0))) {
                case Character.DIRECTIONALITY_RIGHT_TO_LEFT:
                case Character.DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC:
                    return ViewCompat.LAYOUT_DIRECTION_RTL;

                case Character.DIRECTIONALITY_LEFT_TO_RIGHT:
                default:
                    return ViewCompat.LAYOUT_DIRECTION_LTR;
            }
        }
    }

    private static class TextUtilsCompatJellybeanMr1Impl extends TextUtilsCompatImpl {
        TextUtilsCompatJellybeanMr1Impl() {
        }

        @Override
        @NonNull
        public String htmlEncode(@NonNull String s) {
            return TextUtilsCompatJellybeanMr1.htmlEncode(s);
        }

        @Override
        public int getLayoutDirectionFromLocale(@Nullable Locale locale) {
            return TextUtilsCompatJellybeanMr1.getLayoutDirectionFromLocale(locale);
        }
    }

}
（二）TextUtilsCompat 这个类里面有两个内部类，一个是TextUtilsCompatImpl，一个是TextUtilsCompatJellybeanMr1Impl,TextUtilsCompatJellybeanMr1Impl是继承自TextUtilsCompatImpl的。
（三）从静态代码块看出，api 大于17 使用 new TextUtilsCompatJellybeanMr1Impl(); api小于17 使用TextUtilsCompatImpl。TextUtilsCompat，TextUtilsCompatImpl和TextUtilsCompatJellybeanMr1Impl里面都有 htmlEncode 方法和 getLayoutDirectionFromLocale 方法。

静态代码块里面通过TextUtilsCompatImpl IMPL这个常量来判断，当api大于17用TextUtilsCompatJellybeanMr1Impl，否则用TextUtilsCompatImpl，然后htmlEncode方法调用了对应内部类里面的htmlEncode方法，getLayoutDirectionFromLocale调用了对应内部类里面的getLayoutDirectionFromLocale方法。

（四）TextUtilsCompatImpl和TextUtilsCompatJellybeanMr1Impl里面都有 htmlEncode 方法和 getLayoutDirectionFromLocale 方法，看看它们的区别。

（1）TextUtilsCompatJellybeanMr1Impl这个内部类的方法解析：

  • htmlEncode(@NonNull String s) 方法 返回的是：
TextUtilsCompatJellybeanMr1.htmlEncode(s); ==> 调用了TextUtils.htmlEncode(s);
  • getLayoutDirectionFromLocale(@Nullable Locale locale) 方法返回的是：
TextUtilsCompatJellybeanMr1.getLayoutDirectionFromLocale(locale); ==> 调用了TextUtils.getLayoutDirectionFromLocale(locale);

（2）TextUtilsCompatImpl这个内部类的方法解析：

  • htmlEncode(@NonNull String s) 方法 返回的是：
在这个方法内部写了一遍，跟TextUtils.htmlEncode(s);方法里面的一模一样。
  • getLayoutDirectionFromLocale(@Nullable Locale locale) 方法返回的是：
重新写了一遍，这个方法是真正有所区别的地方。

三、根据我做过项目用到的MVP的开发模式，我把共同的htmlEncode方法和getLayoutDirectionFromLocale方法抽取出一个接口，然后分别用两个实现类去实现接口，然后用TextUtilsCompat这个类去判断调用哪个实现类的方法，这样看起来更直观一些。具体步骤如下：

（一）抽取公共接口ITextUtilsCompat
/**
 * 抽取公用的接口
 */
public interface ITextUtilsCompat {

    /**
     * Html-encode the string.
     * @param s the string to be encoded
     * @return the encoded string
     */
    public String htmlEncode(@NonNull String s);

    /**
     * Return the layout direction for a given Locale
     *
     * @param locale the Locale for which we want the layout direction. Can be null.
     * @return the layout direction. This may be one of:
     * {@link android.support.v4.view.ViewCompat#LAYOUT_DIRECTION_LTR} or
     * {@link android.support.v4.view.ViewCompat#LAYOUT_DIRECTION_RTL}.
     *
     * Be careful: this code will need to be updated when vertical scripts will be supported
     */
    public int getLayoutDirectionFromLocale(@Nullable Locale locale);
}
（二）写一个TextUtilsCompatJellybeanMr1实现ITextUtilsCompat 接口，然后把之前TextUtilsCompatJellybeanMr1类里面的复制过来，具体如下：
/**
 * 兼容Android 17+ 版本
 * Jellybean MR1 - specific TextUtils API access.
 */
@RequiresApi(17)
@TargetApi(17)
class TextUtilsCompatJellybeanMr1 implements ITextUtilsCompat{

    @Override
    @NonNull
    public String htmlEncode(@NonNull String s) {
        return TextUtils.htmlEncode(s);
    }

    @Override
    public int getLayoutDirectionFromLocale(@Nullable Locale locale) {
        return TextUtils.getLayoutDirectionFromLocale(locale);
    }
}
（三）写一个类TextUtilsCompatImpl实现ITextUtilsCompat 接口，然后把之前TextUtilsCompat类里面的有关代码复制过来，具体如下：
/**
 * Android 17以下版本使用这个类
 */
class TextUtilsCompatImpl implements ITextUtilsCompat{

    public static final Locale ROOT = new Locale("", "");

    static String ARAB_SCRIPT_SUBTAG = "Arab";
    static String HEBR_SCRIPT_SUBTAG = "Hebr";


    @Override
    @NonNull
    public String htmlEncode(@NonNull String s) {
        StringBuilder sb = new StringBuilder();
        char c;
        for (int i = 0; i < s.length(); i++) {
            c = s.charAt(i);
            switch (c) {
                case '<':
                    sb.append("&lt;"); //$NON-NLS-1$
                    break;
                case '>':
                    sb.append("&gt;"); //$NON-NLS-1$
                    break;
                case '&':
                    sb.append("&amp;"); //$NON-NLS-1$
                    break;
                case '\'':
                    //http://www.w3.org/TR/xhtml1
                    // The named character reference &apos; (the apostrophe, U+0027) was
                    // introduced in XML 1.0 but does not appear in HTML. Authors should
                    // therefore use &#39; instead of &apos; to work as expected in HTML 4
                    // user agents.
                    sb.append("&#39;"); //$NON-NLS-1$
                    break;
                case '"':
                    sb.append("&quot;"); //$NON-NLS-1$
                    break;
                default:
                    sb.append(c);
            }
        }
        return sb.toString();
    }


    @Override
    public int getLayoutDirectionFromLocale(@Nullable Locale locale) {
        if (locale != null && !locale.equals(ROOT)) {
            final String scriptSubtag = ICUCompat.maximizeAndGetScript(locale);
            if (scriptSubtag == null) {
                return getLayoutDirectionFromFirstChar(locale);
            }

            // This is intentionally limited to Arabic and Hebrew scripts, since older
            // versions of Android platform only considered those scripts to be right-to-left.
            if (scriptSubtag.equalsIgnoreCase(ARAB_SCRIPT_SUBTAG) ||
                    scriptSubtag.equalsIgnoreCase(HEBR_SCRIPT_SUBTAG)) {
                return ViewCompat.LAYOUT_DIRECTION_RTL;
            }
        }
        return ViewCompat.LAYOUT_DIRECTION_LTR;
    }

    /**
     * Fallback algorithm to detect the locale direction. Rely on the first char of the
     * localized locale name. This will not work if the localized locale name is in English
     * (this is the case for ICU 4.4 and "Urdu" script)
     *
     * @param locale
     * @return the layout direction. This may be one of:
     * {@link android.support.v4.view.ViewCompat#LAYOUT_DIRECTION_LTR} or
     * {@link android.support.v4.view.ViewCompat#LAYOUT_DIRECTION_RTL}.
     *
     * Be careful: this code will need to be updated when vertical scripts will be supported
     */
    private static int getLayoutDirectionFromFirstChar(@NonNull Locale locale) {
        switch(Character.getDirectionality(locale.getDisplayName(locale).charAt(0))) {
            case Character.DIRECTIONALITY_RIGHT_TO_LEFT:
            case Character.DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC:
                return ViewCompat.LAYOUT_DIRECTION_RTL;

            case Character.DIRECTIONALITY_LEFT_TO_RIGHT:
            default:
                return ViewCompat.LAYOUT_DIRECTION_LTR;
        }
    }
}
（四）封装TextUtilsCompat给调用者使用，具体如下：
/**
 * v4包下面的TextUtilsCompat的简单优化
 * 这里使用的是策略模式，根据不同api版本调用不同的接口实现类
 * 这样写更好维护。
 */
public final class TextUtilsCompat {

    private static final ITextUtilsCompat IMPL;

    private TextUtilsCompat() {}

    static {
        final int version = Build.VERSION.SDK_INT;
        // JellyBean MR1 大于等于17
        if (version >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            IMPL = new TextUtilsCompatJellybeanMr1();
        } else {
            IMPL = new TextUtilsCompatImpl();
        }
    }

    /**
     * Html-encode the string.
     * @param s the string to be encoded
     * @return the encoded string
     */
    @NonNull
    public static String htmlEncode(@NonNull String s) {
        return IMPL.htmlEncode(s);
    }

    /**
     * Return the layout direction for a given Locale
     *
     * @param locale the Locale for which we want the layout direction. Can be null.
     * @return the layout direction. This may be one of:
     * {@link android.support.v4.view.ViewCompat#LAYOUT_DIRECTION_LTR} or
     * {@link android.support.v4.view.ViewCompat#LAYOUT_DIRECTION_RTL}.
     *
     * Be careful: this code will need to be updated when vertical scripts will be supported
     */
    public static int getLayoutDirectionFromLocale(@Nullable Locale locale) {
        return IMPL.getLayoutDirectionFromLocale(locale);
    }
    
}
到此，TextUtilsCompat 这个类就封装完了。看完之后是不是很清爽？其实还有很多类似的类都可以根据类似的方式做一下改进的。源码不是完美的，只要掌握以上示例代码的思想还是很容易的让代码更好理解，更简洁清晰的。
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Spring框架（Spring Framework）是由Rod Johnson于2002年提出的开源Java企业级应用框架，旨在通过使用JavaBean替代传统EJB实现方式降低企业级编程开发的复杂性。该框架基于简单性、可测试性和松耦合性设计理念，提供核心容器、应用上下文、数据访问集成等模块，支持整合Hibernate、Struts等第三方框架，其适用范围不仅限于服务器端开发，绝大多数Java应用均可从中受益。

时间: 2025-12-17 大小: 5MB 下载: 1次
Sublime Text

Sublime Text

Sublime Text具有漂亮的用户界面和强大的功能，例如代码缩略图，Python的插件，代码段等。还可自定义键绑定，菜单和工具栏。Sublime Text 的主要功能包括：拼写检查，书签，完整的 Python API ， Goto 功能，即时项目切换，多选择，多窗口等等。Sublime Text 是一个跨平台的编辑器，同时支持Windows、Linux、Mac OS X等操作系统。

时间: 2025-12-03 大小: 9.84MB 下载: 39次
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