Yes, you can call Java methods (non-native) from a class resolved using vm.resolveClass() in unidbg, as long as the method exists in the APK's DEX file and is not marked native.

Example:

DvmClassclazz = vm.resolveClass("Lcom/example/MyClass;"); DvmObject<?> result = clazz.callStaticJniMethodObject(emulator, "getValue()Ljava/lang/String;"); System.out.println("Result: " + result.getValue());

For instance methods:

DvmObject<?> instance = clazz.newObject(null); DvmObject<?> result = instance.callJniMethodObject(emulator, "sayHello()Ljava/lang/String;");

Important:

• The method must not be native

• It must exist in the APK's DEX file

• You need to use the correct JNI signature (e.g. ()Ljava/lang/String;)

If the method uses Android system APIs, you may need to override or mock behavior via the JNI interface.

Assumptions:

• You have an APK with a class: com.example.MyClass

• Inside that class, there’s a static method:
  Example Code

  import com.github.unidbg.AndroidEmulator;
  import com.github.unidbg.arm.backend.BackendFactory;
  import com.github.unidbg.linux.android.AndroidEmulatorBuilder;
  import com.github.unidbg.linux.android.dvm.*;
  
  import java.io.File;
  
  public class CallJavaMethod {
  
      public static void main(String[] args) {
          // Create emulator instance
          AndroidEmulator emulator = AndroidEmulatorBuilder.for32Bit()
                  .setProcessName("com.example")
                  .addBackendFactory(BackendFactory.create(false)) // disable Unicorn logging
                  .build();
  
          // Create Dalvik VM
          File apkFile = new File("path/to/your.apk"); // Replace with real APK path
          DalvikVM vm = emulator.createDalvikVM(apkFile);
  
          vm.setVerbose(true); // Optional: logs method calls
  
          // Load class from DEX
          DvmClass clazz = vm.resolveClass("Lcom/example/MyClass;");
  
          // Call static method: public static String getGreeting()
          DvmObject<?> result = clazz.callStaticJniMethodObject(emulator, "getGreeting()Ljava/lang/String;");
  
          // Print result
          System.out.println("Returned: " + result.getValue());
  
          emulator.close();
      }
  }