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();}}
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怕仍是不能。于是他们比任何人都看的清楚，又比任何人都看的不确切。
