要解决"Asynctask在getInputStream()上挂起"的问题，可以尝试以下解决方法：

1. 使用线程池替代Asynctask：

ExecutorService executor = Executors.newFixedThreadPool(1);
executor.execute(new Runnable() {
    @Override
    public void run() {
        try {
            URL url = new URL("your_url");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            InputStream inputStream = connection.getInputStream();
            // 处理输入流
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
});
executor.shutdown();

2. 在Asynctask的doInBackground()方法中使用HttpURLConnection：

protected String doInBackground(String... params) {
    String result = null;
    try {
        URL url = new URL("your_url");
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");
        connection.connect();

        int responseCode = connection.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            InputStream inputStream = connection.getInputStream();
            // 处理输入流
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return result;
}

3. 使用OkHttp库进行网络请求：

首先，将以下依赖项添加到build.gradle文件中：

implementation 'com.squareup.okhttp3:okhttp:4.9.1'

然后，使用以下代码进行网络请求：

OkHttpClient client = new OkHttpClient();

Request request = new Request.Builder()
        .url("your_url")
        .build();

client.newCall(request).enqueue(new Callback() {
    @Override
    public void onFailure(Call call, IOException e) {
        e.printStackTrace();
    }

    @Override
    public void onResponse(Call call, Response response) throws IOException {
        if (response.isSuccessful()) {
            InputStream inputStream = response.body().byteStream();
            // 处理输入流
        } else {
            throw new IOException("Unexpected response code: " + response.code());
        }
    }
});

这些解决方法可以避免在getInputStream()上挂起Asynctask，并允许在后台进行网络请求和处理输入流。