子模块调用依赖接口静态方法触发java.lang.NoSuchMethodError求临时方案

我按以下步骤操作后，Android应用启动直接崩溃：

1. 编写一个Java Library，定义包含静态方法的接口并打包成Jar：

public interface InterfaceTest {
    static int test() {
        return 0x16;
    }
}

2. 创建名为sdk的Android Library模块，通过api files('libs/lib.jar')引入上述Jar包，编写调用代码：

public class Main {
    public static int create() {
        return InterfaceTest.test();
    }
}

3. 创建Android应用模块，通过implementation project(':sdk')引入sdk模块，在Activity中调用sdk的方法：

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        Toast.makeText(this, Main.create().toString(), Toast.LENGTH_SHORT).show()
    }
}

4. 执行assembleDebug打包安装后，应用启动触发崩溃，错误日志如下：

FATAL EXCEPTION: main
    Process: io.github.sgpublic.jartest, PID: 18931
    java.lang.NoSuchMethodError: No static method test()I in class Lio/github/sgpublic/lib/InterfaceTest; or its super classes (declaration of 'io.github.sgpublic.lib.InterfaceTest' appears in /data/app/~~YvfX66D6YZcRxdFMHi5zSg==/io.github.sgpublic.jartest-FIbOhcbOzGnvL9VwL_K9UA==/base.apk)
    at io.github.sgpublic.sdk.Main.create(Main.java:12)
    at io.github.sgpublic.jartest.MainActivity.onCreate(MainActivity.kt:12)
    at android.app.Activity.performCreate(Activity.java:8143)
    at android.app.Activity.performCreate(Activity.java:8114)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1310)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3513)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3700)
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2136)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:236)
    at android.app.ActivityThread.main(ActivityThread.java:8060)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:656)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:967)

方案1：调整依赖配置 #

将sdk模块中对Jar包的依赖从api改为implementation，同时在应用模块中添加对该Jar包的compileOnly依赖：

• 修改sdk模块的build.gradle：

implementation files('libs/lib.jar')

• 在应用模块的build.gradle中添加（需将Jar包拷贝到应用模块的libs目录，或使用正确的路径引用）：

compileOnly files('libs/lib.jar')

方案2：转换Java Library为Android Library #

把原本的Java Library改成Android Library模块，让sdk模块通过api project(':your-java-lib-module')引入，这样依赖传递会正确处理接口中的静态方法。

方案3：反射调用静态方法 #

在sdk模块的Main.create()方法中，通过反射获取并调用目标静态方法，绕过依赖传递的问题：

public class Main {
    public static int create() {
        try {
            Class<?> clazz = Class.forName("io.github.sgpublic.lib.InterfaceTest");
            Method method = clazz.getMethod("test");
            return (int) method.invoke(null);
        } catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
            e.printStackTrace();
            return -1;
        }
    }
}

内容的提问来源于stack exchange，提问作者Madray Haven