自动生成Android屏幕适配的dimens.xml

最近团队再做Android App的屏幕适配，按照官方的办法是layout文件引用dimen变量，  变量放在多个不同分辨率下的dimens.xml文件中，分别放在不同的目录下，

    ./app/src/main/res/values-sw480dp-land/dimens.xml        ./app/src/main/res/values-sw600dp-land/dimens.xml        ./app/src/main/res/values-sw720dp-land/dimens.xml        ./app/src/main/res/values-sw800dp-land/dimens.xml        ./app/src/main/res/values-w820dp/dimens.xml  

人工处理这些dimens.xml，感觉比较麻烦，就是个体力活，于是做了个工具类按比例自动化生成dimens.xml文件，效率瞬间提高了很多倍，如果需要特殊定义尺寸，放到另一个xml文件里面就行了。

values/dimens.xml 文件示例

    <resources>                    <!-- Default screen margins, per the Android Design guidelines. -->            <dimen name="activity_horizontal_margin">14dp</dimen>            <dimen name="activity_vertical_margin">14dp</dimen>                    <dimen name="action_bar_height">50dp</dimen>            <dimen name="tab_height">81dp</dimen>            <dimen name="content_margin">18dp</dimen>            <dimen name="list_title_height">63dp</dimen>                    <dimen name="report_table_header_height">54dp</dimen>            <dimen name="report_category_height">54dp</dimen>                    <dimen name="fab_size_normal">72dp</dimen>            <dimen name="fab_margin">14dp</dimen>  

工具类代码，直接运行即可

    import java.io.BufferedReader;        import java.io.BufferedWriter;        import java.io.File;        import java.io.FileReader;        import java.io.FileWriter;        import java.io.IOException;        import java.io.PrintWriter;                /**        * 根据values/dimens.xml, 自动计算比例并生成不同分辨率的dimens.xml        * 注意用dp和sp，不要用dip，否则生成可能会出错；xml值不要有空格        * Created by zhangxitao on 15/9/22.        */        public class DimenTool {                    public static void gen() {                        File file = new File("./app/src/main/res/values/dimens.xml");                BufferedReader reader = null;                StringBuilder sw480 = new StringBuilder();                StringBuilder sw600 = new StringBuilder();                StringBuilder sw720 = new StringBuilder();                StringBuilder sw800 = new StringBuilder();                StringBuilder w820 = new StringBuilder();                                try {                    System.out.println("生成不同分辨率：");                    reader = new BufferedReader(new FileReader(file));                    String tempString;                    int line = 1;                    // 一次读入一行，直到读入null为文件结束                            while ((tempString = reader.readLine()) != null) {                                if (tempString.contains("</dimen>")) {                            //tempString = tempString.replaceAll(" ", "");                            String start = tempString.substring(0, tempString.indexOf(">") + 1);                            String end = tempString.substring(tempString.lastIndexOf("<") - 2);                            int num = Integer.valueOf(tempString.substring(tempString.indexOf(">") + 1, tempString.indexOf("</dimen>") - 2));                                    sw480.append(start).append((int) Math.round(num * 0.6)).append(end).append("\n");                            sw600.append(start).append((int) Math.round(num * 0.75)).append(end).append("\n");                            sw720.append(start).append((int) Math.round(num * 0.9)).append(end).append("\n");                            sw800.append(tempString).append("\n");                            w820.append(tempString).append("\n");                                } else {                            sw480.append(tempString).append("\n");                            sw600.append(tempString).append("\n");                            sw720.append(tempString).append("\n");                            sw800.append(tempString).append("\n");                            w820.append(tempString).append("\n");                        }                        line++;                    }                    reader.close();                    System.out.println("<!--  sw480 -->");                    System.out.println(sw480);                    System.out.println("<!--  sw600 -->");                    System.out.println(sw600);                            System.out.println("<!--  sw720 -->");                    System.out.println(sw720);                    System.out.println("<!--  sw800 -->");                    System.out.println(sw800);                            String sw480file = "./app/src/main/res/values-sw480dp-land/dimens.xml";                    String sw600file = "./app/src/main/res/values-sw600dp-land/dimens.xml";                    String sw720file = "./app/src/main/res/values-sw720dp-land/dimens.xml";                    String sw800file = "./app/src/main/res/values-sw800dp-land/dimens.xml";                    String w820file = "./app/src/main/res/values-w820dp/dimens.xml";                    writeFile(sw480file, sw480.toString());                    writeFile(sw600file, sw600.toString());                    writeFile(sw720file, sw720.toString());                    writeFile(sw800file, sw800.toString());                    writeFile(w820file, w820.toString());                } catch (IOException e) {                    e.printStackTrace();                } finally {                    if (reader != null) {                        try {                            reader.close();                        } catch (IOException e1) {                            e1.printStackTrace();                        }                    }                }            }                    public static void writeFile(String file, String text) {                PrintWriter out = null;                try {                    out = new PrintWriter(new BufferedWriter(new FileWriter(file)));                    out.println(text);                } catch (IOException e) {                    e.printStackTrace();                }                        out.close();            }                    public static void main(String[] args) {                gen();            }        }