在Android应用程序冷启动时，在VPN启动之前阻止网络请求

public class NetworkInterceptor implements Interceptor {
    @Override
    public Response intercept(Chain chain) throws IOException {
        // 判断VPN是否已经启动
        if (!isVpnStarted()) {
            // VPN未启动，取消网络请求
            throw new IOException("VPN not started");
        }

        // VPN已启动，继续网络请求
        return chain.proceed(chain.request());
    }

    private boolean isVpnStarted() {
        // 判断VPN是否已经启动的逻辑
        // TODO: 实现判断VPN是否已经启动的逻辑
        return false;
    }
}

OkHttpClient client = new OkHttpClient.Builder()
        .addInterceptor(new NetworkInterceptor())
        .build();

Request request = new Request.Builder()
        .url("https://example.com/api")
        .build();

Response response = client.newCall(request).execute();