Android HTTP API调用

// GET请求示例
URL url = new URL("https://api.example.com/data");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Authorization", "Bearer token");

int responseCode = conn.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
    BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    String inputLine;
    StringBuilder response = new StringBuilder();
    while ((inputLine = in.readLine()) != null) {
        response.append(inputLine);
    }
    in.close();
    Log.d("API_RESPONSE", response.toString());
}
conn.disconnect();

// 1. 定义API接口
interface ApiService {
    @GET("data")
    suspend fun getData(@Header("Authorization") token: String): Response<DataModel>
}

// 2. 创建Retrofit实例
val retrofit = Retrofit.Builder()
    .baseUrl("https://api.example.com/")
    .addConverterFactory(GsonConverterFactory.create())
    .client(OkHttpClient.Builder().build())
    .build()

// 3. 发起请求（CoroutineScope中）
val api = retrofit.create(ApiService::class.java)
try {
    val response = api.getData("Bearer token")
    if (response.isSuccessful) {
        val data = response.body()
    }
} catch (e: Exception) {
    e.printStackTrace()
}