问题描述
我有一个android studio项目,文件gradle/wrapper/gradle-wrapper.properties配置如下.
I have an android studio project, with the file gradle/wrapper/gradle-wrapper.properties configured as following.
#Wed Apr 10 15:27:10 PDT 2013 distributionBase=GRADLE_USER_HOME distributionPath=wrapper/dists zipStoreBase=GRADLE_USER_HOME zipStorePath=wrapper/dists distributionUrl=http://www.51sjk.com/Upload/Articles/1/0/336/336990_20221116144926880.zip
我的主目录中安装了 2.2.1-all 版本.
And I have the 2.2.1-all version installed in my home directory.
.gradle/wrapper/dists/gradle-2.2.1-all/c64ydeuardnfqctvr1gm30w53/gradle-2.2.1-all.zip
当我调用 ./gradlew 命令来构建项目时.我应该使用 gradle-2.2.1-all.zip 来构建.
When I invoke ./gradlew command to build the project. I should use the gradle-2.2.1-all.zip to build.
但它不会,即使是相同版本,它也会下载另一个 gradle.因此,版本 2.2.1-all 有两个 gradle.因为我的网络连接很慢,所以需要很长时间.
But it doesn't, it will download another gradle even for the same version instead. So, there are two gradles for the version 2.2.1-all. Because my internet connection is very slow, it takes too long.
.gradle/wrapper/dists/gradle-2.2.1-all/c64ydeuardnfqctvr1gm30w53/gradle-2.2.1-all.zip .gradle/wrapper/dists/gradle-2.2.1-all/6dibv5rcnnqlfbq9klf8imrndn/gradle-2.2.1-all.zip
这很烦人,因为每次我调用命令来构建我的项目时,它都必须为同一版本下载一个新版本.
It's very annoying since it has to download a new one for the same version very time I invoke the command to build my project.
为什么 gradle 构建系统无法选择已安装的系统?
Why the gradle build system couldn't pick the installed one?
推荐答案
出现问题是因为s??tudio的gradle-wrapper.jar和最新的下载url的hash策略不同gradle-wrapper.jar.
The problem occurred is because the hash policy for the download url is different between studio's gradle-wrapper.jar and latest gradle-wrapper.jar.
我的 Android 应用目录下的 gradle-wrapper.jar(我猜它是从 android-sdk-macosx/tools/templates/gradle/wrapper/gradle/wrapper/gradle-wrapper.jar)使用下面的方法计算下载url的hash.
The gradle-wrapper.jar under my Android app directory (I guess it's copied from android-sdk-macosx/tools/templates/gradle/wrapper/gradle/wrapper/gradle-wrapper.jar) use the following method to calculate hash for the download url.
// PathAssembler.java private String getMd5Hash(String string) { try { MessageDigest e = MessageDigest.getInstance("MD5"); byte[] bytes = string.getBytes(); e.update(bytes); return (new BigInteger(1, e.digest())).toString(32); } catch (Exception var4) { throw new RuntimeException("Could not hash input string.", var4); } }
但是最新的gradle-wrapper.jar使用下面的方法来做.基数从 32 变为 36.
But the latest gradle-wrapper.jar use the following method to do. The radix change from 32 to 36.
private String getHash(String string) { try { MessageDigest messageDigest = MessageDigest.getInstance("MD5"); byte[] bytes = string.getBytes(); messageDigest.update(bytes); return new BigInteger(1, messageDigest.digest()).toString(36); } catch (Exception e) { throw new RuntimeException("Could not hash input string.", e); } }
我在目录名中找到的魔法字符串是下载url的md5哈希字符串.
The magic string I found in the directory name is the md5 hash string of the download url.
对于2.10版本,有目录名
For version 2.10, there is a directory name
.gradle/wrapper/dists/gradle-2.10-all/a4w5fzrkeut1ox71xslb49gst
并且 a4w5fzrkeut1ox71xslb49gst 是从下载 url 散列的.
And the a4w5fzrkeut1ox71xslb49gst is hashed from the download url.
try { MessageDigest messageDigest = MessageDigest.getInstance("MD5"); messageDigest.update("http://www.51sjk.com/Upload/Articles/1/0/336/336990_20221116144932958.zip".getBytes()); System.out.println(new BigInteger(1, messageDigest.digest()).toString(36)); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); }
通过对来自 gradle/wrapper/gradle-wrapper.properties 的相同下载 url 使用相同的哈希方法(使用相同的 gradle-wrapper.jar),有同一版本的 gradle 不会被多次下载.
By using the same hash method (use the same gradle-wrapper.jar) for the same download url from gradle/wrapper/gradle-wrapper.properties, there won't be multiple downloads for the same version of gradle.
这个问题只存在于android studio项目和其他gradle项目之间.
This issue only exist between android studio project and other gradle project.