我正在使用改型2,并试图从我用Python创建的Web服务请求一些数据。在
实际上它会抛出一个“java.lang.IllegalStateException“但是当我调用GET方法时,API返回代码200,而且我还可以看到一个用于调试响应JSON的打印版本。问题是Call方法,因为它总是在失败时执行。在
求求你,救命!在
这是我的(简单的)Python Web服务,api prueba:
from flask import Flask, jsonify import json import mysql.connector import collections app = Flask(__name__) cnx = mysql.connector.connect(user="root", password="", host="localhost", database="gym") @app.route('/gym/api/v1.0/clases', methods=['GET']) def getClases(): sql = "SELECT id, nombre, descripcion FROM clases" cursor = cnx.cursor() cursor.execute(sql) entradas = cursor.fetchall() # Convertir la query en un array de entradas objects_list = [] for row in entradas: objects_list.append(row) j = json.dumps(objects_list) return j @app.route('/') def index(): return 'Hello, World!' if __name__ == '__main__': app.run(debug=True)
这是我的客户:
^{pr2}$我的API Interce,API服务:
public interface ApiService { @GET("clases") Call> getClases(); }
这是查询API并获取数据的片段ClaseFragment:
public class ClaseFragment extends Fragment implements View.OnClickListener { private List clases; private ListView listView; private Button btnRefresh; public ClaseFragment() { // Required empty public constructor } public static ClaseFragment newInstance() { ClaseFragment fragment = new ClaseFragment(); Bundle args = new Bundle(); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments() != null) { } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View root = inflater.inflate(R.layout.fragment_clase, container, false); listView = (ListView) root.findViewById(R.id.claseList); btnRefresh = (Button) root.findViewById(R.id.btnRefresh); btnRefresh.setOnClickListener(this); getListaClases(); return root; } @Override public void onClick(View v) { //do what you want to do when button is clicked switch (v.getId()) { case R.id.btnRefresh: Log.d(getTag(), "hello"); getListaClases(); break; default: break; } } private void getListaClases() { final ProgressDialog loading = ProgressDialog.show(getActivity(), getContext().getString(R.string.loading_title), getContext().getString(R.string.loading_please_wait), false, false); Call> call = ApiClient.get().getClases(); call.enqueue(new Callback>() { @Override public void onFailure(Call> call, Throwable t) { Log.d("ApiService", "Error Occured: " + t.getMessage()); loading.dismiss(); } @Override public void onResponse(Call> call, Response> response) { Log.d("ApiService", "Successfully response fetched"); loading.dismiss(); if (response.code() == 200 && response.isSuccessful()) { clases = response.body(); showList(); } else { Log.d("APIPlug", "No item found"); } } }); } //Our method to show list private void showList() { Log.d("ApiService", "Show List"); ClaseAdapter adapter = new ClaseAdapter(getActivity(), clases); listView.setAdapter(adapter); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView parent, View view, int position, long id) { Clase clickedObj = (Clase) parent.getItemAtPosition(position); //If you have detail activity about your object define in here /* Intent detail = new Intent(getContext(), ActorDetail.class); detail.putExtra("actorObject", clickedObj); startActivity(detail); */ } }); } }
这是我的web服务的实际响应,我想将其显示在ListView中:
[
[1, "halterofilia", "Profesor: XXXX YYYY. Clase de Halterofilia."],
[2, "crossfit", "Profesor:ZZZZ TTTT. Clase de CrossFit"],
[3, "halterofilia", "Profesor:XXXX YYYY. Clase de halterofilia"]
]
编辑:
从Android Studio进行回溯:
D/OkHttp: --> GET http://10.0.2.2:5000/gym/api/v1.0/clases http/1.1
D/OkHttp: --> END GET
D/OkHttp: <-- 200 OK http://10.0.2.2:5000/gym/api/v1.0/clases (8ms)
D/OkHttp: Content-Type: text/html; charset=utf-8
D/OkHttp: Content-Length: 192
D/OkHttp: Server: Werkzeug/0.11.11 Python/2.7.12
D/OkHttp: Date: Sat, 08 Oct 2016 23:19:00 GMT
D/OkHttp: OkHttp-Sent-Millis: 1475968739892
D/OkHttp: OkHttp-Received-Millis: 1475968739897
D/OkHttp: [[1, "halterofilia", "Profesor: XXXX YYYY. Clase de Halterofilia."], [2, "crossfit", "Profesor:ZZZZ TTTT. Clase de CrossFit"], [3, "halterofilia", "Profesor:XXXX YYYY. Clase de halterofilia"]]
D/OkHttp: <-- END HTTP (192-byte body)
D/ApiService: Error Occured: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 3 path $[0]
这是我运行Web服务的PyCharm:
* Detected change in 'D:\\Proyectos\\PyCharm\\api-prueba\\api-prueba.py', reloading
* Restarting with stat
* Debugger is active!
* Debugger pin code: 195-275-846
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [09/Oct/2016 00:21:38] "GET /gym/api/v1.0/clases HTTP/1.1" 200 -
从这个错误中,您可以说它与预期的改造和API提供的不匹配。更具体地说,似乎改造需要一个对象,但API返回一个数组。 我猜你正在尝试获取Clases对象的列表,而你的API发送了一个数组。。。数组。在
为了实现这一点,我将尝试获得如下API响应:
(id、name和title将替换为db字段的实际名称)
下面是一个链接,可以指导您如何实现对python代码的更改: Python converting mysql query result to json
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