连接到Web API的Android版本

URL url = new URL("http://api.example.com/endpoint");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");

int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
    InputStream inputStream = connection.getInputStream();
    // 处理输入流数据
} else {
    // 处理请求失败的情况
}

connection.disconnect();

OkHttpClient client = new OkHttpClient();

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

Call call = client.newCall(request);
call.enqueue(new Callback() {
    @Override
    public void onResponse(Call call, Response response) throws IOException {
        if (response.isSuccessful()) {
            String responseData = response.body().string();
            // 处理响应数据
        } else {
            // 处理请求失败的情况
        }
    }

    @Override
    public void onFailure(Call call, IOException e) {
        // 处理请求失败的情况
    }
});

RequestQueue queue = Volley.newRequestQueue(context);
String url = "http://api.example.com/endpoint";

StringRequest request = new StringRequest(Request.Method.GET, url,
        new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                // 处理响应数据
            }
        },
        new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                // 处理请求失败的情况
            }
        });

queue.add(request);