【Android新手笔记六】从服务器获取列表

来源：互联网发布：淘宝网加绒运动服装编辑：程序博客网时间：2024/05/22 01:30

项目需要从服务器获取某个用户的就诊信息列表。

先定义一个字符串数组用于存放服务器端获得的列表，同时定义一个int数组存放每一项对应的数据表中的主键（编号），方便之后获得该项的具体信息

private String[] strings;private int[] number;

进行与服务器的交互

          final MediaType JSON                        = MediaType.parse("application/json; charset=utf-8");                JSONObject jsonObject = new JSONObject();                try {                    jsonObject.put("tag", "clinic_reception_list");                    jsonObject.put("name", stringname);                    jsonObject.put("userID", stringID);            //数据上传到服务器                } catch (JSONException e) {                    e.printStackTrace();                }                OkHttpClient client = new OkHttpClient();                RequestBody body = FormBody.create(JSON, jsonObject.toString());                Request request = new Request.Builder().url(URL).post(body).build();                Call call=client.newCall(request);                call.enqueue(new Callback() {                    @Override                    public void onFailure(Call call, IOException e) {                        Log.e(TAG,"error:",e);                    }                    @Override                    public void onResponse(Call call, Response response) throws IOException {    //返回的json数据包括jsonarray，详见下文服务端代码                        try {                            JSONObject object = new JSONObject(response.body().string());                            times=object.getInt("times");                //列表项的个数                            error=object.getBoolean("error");                            if (!error) {                                JSONArray jsonArray = object.getJSONArray("str"); //str对应的value是一个json数组，数组中每个包括列表项和number两个键值对                                                                strings=new String[times];          //声明数组长度                                number=new int[times];                                for (int i = 0; i < times; i++) {                                    JSONObject jsonObject1 = jsonArray.getJSONObject(i);                                                                       strings[i]=jsonObject1.getString("name");                                    number[i] = jsonObject1.getInt("number");     //列表项和对应number分别填入数组中                                }                                ListView lv = (ListView) findViewById(R.id.listView);                                lv.setAdapter(new ArrayAdapter<String>(clinic_reception_list.this, android.R                                        .layout.simple_list_item_1, strings));   //strings数组显示在listview上                                 lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {                                    @Override                                    public void onItemClick(AdapterView<?> parent, View view, int position,                                                            long id) {                                        Intent intent = new Intent(clinic_reception_list.this, clinic_reception_look1.class);                                        Bundle bundle = new Bundle();                                                                           bundle.putInt("number", number[position]);   //点击了列表中某一项后，将该项对应的number传递给下一个activity并跳转                                        intent.putExtras(bundle);                                                                           startActivity(intent);                                    }                                });                            }                            else {                                String errorMsg = object.getString("error_msg");                                Looper.prepare();                                Toast toast = Toast.makeText(getApplicationContext(), errorMsg,                                        Toast.LENGTH_LONG);                                toast.show();                                Looper.loop();                            }                        } catch (JSONException e) {                            e.printStackTrace();                        }                    }                });            }

服务器端对应php代码：

else if($tag=='clinic_reception_list'){$name = $data->name;    //data是接收Android发送的json数据$userID = $data->userID;$str=array();$dbname = "test";          // 数据库名                $select = mysqli_select_db($conn, $dbname);   // 选择数据库$charset= mysqli_set_charset($conn,"utf-8");   //编码格式$result = mysqli_query($conn,"SELECT * FROM clinic_reception WHERE userID = $userID");                                   //查找接诊表格中该用户就诊信息if(!$result){$response["error"]=true;$response["error_msg"] ="还没有就诊信息";$response =json_encode($response);                echo $response;}else{$response["error"]=false;$response["times"]=mysqli_num_rows($result);$i=0;while($row = mysqli_fetch_array($result)){    $str[$i]["name"]="接诊记录表".$row["reception_date"];                        //该用户的所有接诊记录表记录以接诊记录表+日期的形式返回    $str[$i]["number"]=$row["Number"];             //接诊记录表的主键也response，用于根据主键获取详细的接诊记录表内容$i++;    }$response["str"]=($str);$response =json_encode($response);                echo $response;}}

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