1public class MyJni extends AbstractJni {
2    // override methods as needed
3}
4
5VM vm = emulator.createDalvikVM();
6vm.setJni(new MyJni());
7vm.setVerbose(true);  // logs unhandled JNI calls — useful for discovery

1@Override
2public long callStaticLongMethod(BaseVM vm, DvmClass dvmClass, String signature, VarArg varArg) {
3    if ("com/example/MyClass->myMethod(I)J".equals(signature)) {
4        int arg = varArg.getIntArg(0);
5        return arg * 2L;
6    }
7    return super.callStaticLongMethod(vm, dvmClass, signature, varArg);
8}

1@Override
2public DvmObject<?> callStaticObjectMethod(BaseVM vm, DvmClass dvmClass, String signature, VarArg varArg) {
3    if ("com/example/MyClass->getKey()Ljava/lang/String;".equals(signature)) {
4        return new StringObject(vm, "secret-key");
5    }
6    return super.callStaticObjectMethod(vm, dvmClass, signature, varArg);
7}

1@Override
2public int callIntMethod(BaseVM vm, DvmObject<?> dvmObject, String signature, VarArg varArg) {
3    if ("com/example/MyClass->getValue()I".equals(signature)) {
4        return 42;
5    }
6    return super.callIntMethod(vm, dvmObject, signature, varArg);
7}

 1@Override
 2public int getIntField(BaseVM vm, DvmObject<?> dvmObject, String signature) {
 3    if ("com/example/MyClass->count:I".equals(signature)) {
 4        return 100;
 5    }
 6    return super.getIntField(vm, dvmObject, signature);
 7}
 8
 9@Override
10public void setIntField(BaseVM vm, DvmObject<?> dvmObject, String signature, int value) {
11    if ("com/example/MyClass->count:I".equals(signature)) {
12        // capture or ignore
13        return;
14    }
15    super.setIntField(vm, dvmObject, signature, value);
16}

1@Override
2public DvmObject<?> newObject(BaseVM vm, DvmClass dvmClass, String signature, VarArg varArg) {
3    if ("com/example/MyClass-><init>()V".equals(signature)) {
4        return dvmClass.newObject(null);
5    }
6    return super.newObject(vm, dvmClass, signature, varArg);
7}

1int i = varArg.getIntArg(0);
2long l = varArg.getLongArg(0);
3DvmObject<?> obj = varArg.getObjectArg(0);