我正在尝试使用php从我的域服务器到android应用程序从mysql获取数据

首先,您必须在清单文件中添加Internet权限

那么Java代码

public static JSONObject getJSONObjectFromURL(String urlString) throws IOException, JSONException {
    HttpURLConnection urlCOnnection= null;
    URL url = new URL(urlString);
    urlCOnnection= (HttpURLConnection) url.openConnection();
    urlConnection.setRequestMethod("GET");
    urlConnection.setReadTimeout(10000 /* milliseconds */ );
    urlConnection.setConnectTimeout(15000 /* milliseconds */ );
    urlConnection.setDoOutput(true);
    urlConnection.connect();

    BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()));
    StringBuilder sb = new StringBuilder();

    String line;
    while ((line = br.readLine()) != null) {
        sb.append(line + "\n");
    }
    br.close();

    String jsOnString= sb.toString();
    System.out.println("JSON: " + jsonString);

    return new JSONObject(jsonString);
}

并使用如下功能

try{
      JSONObject jsOnObject= getJSONObjectFromURL(urlString);
 // here you can use Jsonobject or Jsonarray as per your requirement.
        } catch (IOException e) {
              e.printStackTrace();
        } catch (JSONException e) {
              e.printStackTrace();
        }