Android 获取运行时依赖项列表

最近我在做一些关于Android依赖项的研究工作，有一个问题一直萦绕在我的脑海中。问题是我们可以通过使用java代码获得依赖项列表吗

例如，我的build.gradle文件中的依赖项

dependencies {
   compile 'com.google.android.gms:play-services:+'
   compile 'com.facebook.android:facebook-android-sdk:4.1.0'
}

---

现在，如果我想知道应用程序运行时这些依赖项的名称，我们可以得到它吗？

不太可能。它们是编译时依赖项。在编译的APK中，以下各项之间没有显著差异：

• 编译'com.facebook.android:facebook android sdk:4.1.0'

• 编译项目（“：facebook”）

  ，在这里，您克隆了一个GitHub repo或其他东西，以提供一个本地库项目，而不是从存储库中引用工件

• 在你编写的应用程序中有一堆带有Facebook名称和软件包的类（与一堆参考资料相同）

如果您正在编写应用程序，并且使用不同的构建类型和/或产品风格，并且每个版本都有不同的依赖项，则可以使用

BuildConfig

来检测正在运行的构建变体

---

如果您正在编写一个库，并且希望在运行时确定开发人员是否添加了某个依赖项，那么您所能做的最好的事情就是四处嗅探，看看该依赖项是否存在某些内容，以及它们是否符合您的期望。这方面的详细信息因依赖关系而异（例如，查看Play服务是否存在将有一组硬编码检查；查看Facebook SDK是否存在将有一组单独的硬编码检查）。这不会区分我上面的三个项目，但这是您能够做的最好的事情。

在@commonware关于在运行时查找jar依赖项的注释中添加一些代码

import org.kohsuke.args4j.CmdLineParser;

import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;

public class RuntimeDependenciesExample {

    public static void main(String[] args) {
        // just to add some dependency for our list
        CmdLineParser parser = null;
        RuntimeDependenciesExample main = new RuntimeDependenciesExample();
        main.findRuntimeDependencies();
        main.checkSystemClassPath();
    }

    private void checkSystemClassPath() {
        System.out.println("System classpath:\n" + System.getProperty("java.class.path").replace(':', '\n'));
    }

    private void findRuntimeDependencies() {
        ClassLoader classloader = Thread.currentThread().getContextClassLoader();
        do {
            System.out.println("Using classloader: " + classloader.toString());
            URL[] urls = ((URLClassLoader) classloader).getURLs();
            List<String> jars = new ArrayList<>();
            for (URL url : urls) {
                jars.add(url.getFile());
            }

            printFiltered(jars);
            classloader = classloader.getParent();
        } while (classloader != null);
    }

    private void printFiltered(List<String> jars) {
        System.out.println("\nFiltered jar list:");
        for (String jarPath : jars) {
            if (!jarPath.contains("jre") && !jarPath.contains("jdk")) {
                System.out.println(jarPath);
            }
        }
        System.out.println('\n');
    }
}

---

是的，这就是我试图做的，写一个库，想知道其他dependecy开发者添加了什么。否。构建完成后，从依赖项中得到的只有类。

main

？这将适用于java应用程序，而不是android应用程序。是的，但同样的概念也适用。获取

ClassLoader

并查看它包含的路径。然后检查父类加载程序的路径。代码没有java应用程序或android特定的内容。（除了main方法）不太可能，因为所有依赖项都打包在同一个dex文件中。您只能得到系统类路径，它不能回答OP的问题。

Using classloader: sun.misc.Launcher$AppClassLoader@29453f44

Filtered jar list:
/Users/someUser/dev/test-code/build/classes/main/
/Users/someUser/dev/test-code/build/resources/main/
/Users/someUser/.gradle/caches/modules-2/files-2.1/org.codehaus.groovy/groovy-all/2.3.11/f6b34997d04c1538ce451d3955298f46fdb4dbd4/groovy-all-2.3.11.jar
/Users/someUser/.gradle/caches/modules-2/files-2.1/args4j/args4j/2.32/1ccacebdf8f2db750eb09a402969050f27695fb7/args4j-2.32.jar
/Applications/IntelliJ%20IDEA%2016%20EAP.app/Contents/lib/idea_rt.jar


Using classloader: sun.misc.Launcher$ExtClassLoader@266474c2

Filtered jar list:
/usr/local/Cellar/subversion/1.8.10_2/lib/libsvnjavahl-1.0.dylib
/System/Library/Java/Extensions/MRJToolkit.jar


System classpath:
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/charsets.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/deploy.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/ext/cldrdata.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/ext/dnsns.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/ext/jaccess.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/ext/jfxrt.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/ext/localedata.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/ext/nashorn.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/ext/sunec.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/ext/zipfs.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/javaws.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/jce.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/jfr.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/jfxswt.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/jsse.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/management-agent.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/plugin.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/resources.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/rt.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/lib/ant-javafx.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/lib/dt.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/lib/javafx-mx.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/lib/jconsole.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/lib/packager.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/lib/sa-jdi.jar
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/lib/tools.jar
/Users/someUser/dev/test-code/build/classes/main
/Users/someUser/dev/test-code/build/resources/main
/Users/someUser/.gradle/caches/modules-2/files-2.1/org.codehaus.groovy/groovy-all/2.3.11/f6b34997d04c1538ce451d3955298f46fdb4dbd4/groovy-all-2.3.11.jar
/Users/someUser/.gradle/caches/modules-2/files-2.1/args4j/args4j/2.32/1ccacebdf8f2db750eb09a402969050f27695fb7/args4j-2.32.jar
/Applications/IntelliJ IDEA 16 EAP.app/Contents/lib/idea_rt.jar