如何以编程方式读取我的 Android apk 构建日期? [英] How to programmatically read the date when my Android apk was built?

问题描述

是否可以以编程方式读取我的 Android apk 构建日期?我在 PackageInfo 类中找不到任何内容.

Is it possible to programmatially read the date when my Android apk was built? I could not find anything in the PackageInfo class.

我想让我的应用程序的 beta 版本过期，最简单的方法是读出这样的日期并在修复前几天后过期，所以我不必每次构建时都更新代码并部署测试版.

I want to expire beta versions of my app and the easiest way would be to read out such a date and expire it after a fix preiode of days, so I don't have to update the code for that eavery time I build and deploy a beta version.

推荐答案

注意 6/1/2020:Android Studio 4.1 Canary 10 w/Gradle >= 6.5 已更新说明.如果您看到Unsupported BuildConfig type : java.util.Date 错误，请向下滚动以进行修复.

Note 6/1/2020: Android Studio 4.1 Canary 10 w/Gradle >= 6.5 has updated instructions. If you are seeing an "Unsupported BuildConfig type : java.util.Date error, scroll down for the fix.

[旧说明]

在 build.gradle 中，您的每个 构建类型 应该有一个 buildConfigField.(这是配置的简化版本 - 您可能会在此处添加其他内容，但我想展示您将其放置的位置):

In build.gradle, each of your build types should have a buildConfigField. (This is a simplified version of the configuration- you're likely to have other stuff in here, but I wanted to show where you put it):

android {
    signingConfigs {
        buildTypes {
            debug {
                buildConfigField "java.util.Date", "BUILD_TIME", "new java.util.Date(" + System.currentTimeMillis() + "L)"
            }
            release { 
                buildConfigField "java.util.Date", "BUILD_TIME", "new java.util.Date(" + System.currentTimeMillis() + "L)"
            }
        }
    }
}    

(请注意，BuildConfigField"是BuildConfigLine"的>较新版本，从 0.8.0 构建系统开始.)

(Note that "BuildConfigField" is the newer version of "BuildConfigLine" as of the 0.8.0 build system.)

下次 gradle 执行 assembleRelease 或 assembleDebug 时，它应该生成:

The next time gradle does assembleRelease or assembleDebug, it should generate:

./build/source/buildConfig/releaseORdebug/com/your/project/BuildConfig.java

接下来，在 BuildConfig 文件中，您应该会看到一些已自动生成的内容，例如:

Next, inside that BuildConfig file, you should see something has been auto-generated like:

public final class BuildConfig {
    public static final java.util.Date BUILD_TIME = new java.util.Date(1395794838381L);
}

因此，要在您的应用中访问构建日期....

So, to access the build date within your app....

Date buildDate = BuildConfig.BUILD_TIME;
Log.i("MyProgram", "This .apk was built on " + buildDate.toString());

(您可以使用 SimpleDateFormat 随意格式化日期.)

(You can format the date however you like using a SimpleDateFormat.)

更新 6/1/2020 -- 在 Android Studio 4.1 Canary 10 w/Gradle 6.5 中，上述解决方案导致不支持的 BuildConfig 类型:java.util.Date"错误.应使用与上述略有不同的代替:

Update 6/1/2020 -- In Android Studio 4.1 Canary 10 w/Gradle 6.5, the above solution results in an "Unsupported BuildConfig type : java.util.Date" error. A slight variation to the above should be used instead:

android {
    signingConfigs {
        buildTypes {
            debug {
                buildConfigField("String", "BUILD_TIME", System.currentTimeMillis().toString())
            }
            release { 
                buildConfigField("String", "BUILD_TIME", System.currentTimeMillis().toString())
            }
        }
    }
} 

更新 7/30/2020 在 gradle 6.6-rc4 之后，您需要通过更改为这一行来包含时间的封闭引号:

Update 7/30/2020 After gradle 6.6-rc4, you need to include the enclosing quotes for the time by changing to this line:

        buildConfigField("String", "BUILD_TIME", "\"" + System.currentTimeMillis().toString() + "\"")

在 BuildConfig 文件中，您应该会看到一些已经自动生成的内容，例如:

Inside the BuildConfig file, you should see something has now been auto-generated like:

public final class BuildConfig {
      public static final String BUILD_TIME = "1590735284503";
}

现在，要在您的应用中访问构建日期....

So now, to access the build date within your app....

private Date buildDate = new Date(Long.parseLong(BuildConfig.BUILD_TIME));
Log.i("MyProgram", "This .apk was built on " + buildDate.toString());

和以前一样，您可以使用 SimpleDateFormat.

As before, you can format the date however you like using a SimpleDateFormat.

希望对您有所帮助.

这篇关于如何以编程方式读取我的 Android apk 构建日期?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！