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>


     <dimen name="activity_horizontal_margin">14dpdimen>
     <dimen name="activity_vertical_margin">14dpdimen>

     <dimen name="action_bar_height">50dpdimen>
     <dimen name="tab_height">81dpdimen>
     <dimen name="content_margin">18dpdimen>
     <dimen name="list_title_height">63dpdimen>

     <dimen name="report_table_header_height">54dpdimen>
     <dimen name="report_category_height">54dpdimen>

     <dimen name="fab_size_normal">72dpdimen>
     <dimen name="fab_margin">14dpdimen>

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("")) {
                     //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("") - 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("");
             System.out.println(sw480);
             System.out.println("");
             System.out.println(sw600);

             System.out.println("");
             System.out.println(sw720);
             System.out.println("");
             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();
     }
 }