问如何在android中使用反射创建回调？

EN

// that class you don't have access too. imagine that it is not here, it is just to show example signature of method we want to run.
interface Callback {
    void run();
}

public static void main(String[] args) throws Exception {
    Class<?> callbackClass = Class.forName("package.Callback");
    Callback callback = Proxy.newProxyInstance(Main.class.getClassLoader(), new Class[]{callbackClass}, new CallbackInvocationHandler(() -> {
        System.out.println("callback");
    }));
    callbackClass.getMethod("run").invoke(callback); // works!
}

static class CallbackInvocationHandler implements InvocationHandler {
    private final Runnable myCallback;

    CallbackInvocationHandler(Runnable myCallback) {
        this.myCallback = myCallback;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        if (method.getName().equals("toString") && (method.getParameterCount() == 0)) {
            // just random implementation
            return proxy.getClass() + "@" + Integer.toHexString(System.identityHashCode(proxy));
        }
        if (method.getName().equals("hashCode") && (method.getParameterCount() == 0)) {
            return System.identityHashCode(proxy);
        }
        if (method.getName().equals("equals") && (method.getParameterCount() == 1) && (method.getParameterTypes()[0] == Object.class)) {
            return proxy == args[0];
        }
        if (method.getName().equals("run") && (method.getParameterCount() == 0)) {
            // do what you want.
            myCallback.run();
            return null;
        }
        throw new IllegalStateException("Method not implemented: " + method);
    }
}