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();
    }
}