我是Retrofit 2.0的新手,过去几天一直试图解决这个问题,但没有任何进展。我有一个使用Retrofit 2.0的工作代码,以便通过使用PHP脚本从SQL DB获取JSON数据来填充Android活动的回收站视图。
已经看了许多不同的岗位和教程后,我已经修改了上述工作的代码,以使一个日期选择器的选择的日期通过改造的被发送到PHP的脚本GET @Query参数改造的界面中在PHP脚本中被$selected_date = $GET["date"];
拦截。
如果我在selected_date_lectures.php中设置了一个值,就像这样=>$selected_date = "2017-04-22";
根据datePicker的选择将数据成功提取回recyclerview。此外,DatePicker的日期也可以在选择时使用敬酒成功显示。
这使我相信我在做出改进Get @Query请求时或者尝试从PHP使用$GET["date"];
获取@query参数时必须做错事,尽管我没有发现任何在我的代码中可能出错的东西。
我跑出了想法来解决这个问题,并会非常感谢任何建议。
下面是DatePicker的onDataSet方法中的代码片段,它是在选择日期时触发HTTP请求的方法。
@Override
public void onDateSet(DatePickerDialog view, int Year, int Month, int Day) {
// For some reason selected month's output is previous month
Month +=1;
// Selected date is formated in the same manner as DB's date which will be compared to find a match.
String date = Year + "-" + String.format("%02d", Month) + "-" + String.format("%02d", Day);
swipeRefreshLayout.setRefreshing(true);
ApiInterface apiService =
ApiClient.getClient().create(ApiInterface.class);
// Selected date from date picker is added to apiService.getSelectedDateLectures(date);
Call<List<Message>> call = apiService.getSelectedDateLectures(date);
call.enqueue(new Callback<List<Message>>() {
@Override
public void onResponse(Call<List<Message>> call, Response<List<Message>> response) {
// clear the inbox
messages.clear();
swipeRefreshLayout.setRefreshing(false);
// add all the messages
// messages.addAll(response.body());
// TODO - avoid looping
// the loop was performed to add colors to each message
for (Message message : response.body()) {
// generate a random color
// message.setColor(getRandomMaterialColor("400"));
messages.add(message);
}
mAdapter.notifyDataSetChanged();
swipeRefreshLayout.setRefreshing(false);
}
@Override
public void onFailure(Call<List<Message>> call, Throwable t) {
Toast.makeText(getApplicationContext(), "Unable to fetch json: " + t.getMessage(), Toast.LENGTH_LONG).show();
swipeRefreshLayout.setRefreshing(false);
}
});
Toast.makeText(MainActivity.this, date, Toast.LENGTH_LONG).show();
}
ApiClient.java - 这是接口的HTTP请求被构建
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
public class ApiClient {
public static final String BASE_URL = "http://lankabentara.tech/FC6P01/android_sign_attendance/";
private static Retrofit retrofit = null;
public static Retrofit getClient() {
if (retrofit == null) {
retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofit;
}
}
ApiInterface.java - 这是在所有的网络请求被写入其中。
import info.codex.app.model.Message;
import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.Query;
public interface ApiInterface {
// HTTP OPERATION => Fetch today's lectures
@GET("today_lectures.php")
Call<List<Message>> getInbox();
// HTTP OPERATION => Fetch selected date's lectures
@GET("selected_date_lectures.php")
Call<List<Message>> getSelectedDateLectures(@Query("date") String date);
}
selected_date_lectures.php -Lastly,第三行是我在尝试使用$ GET来获得日期参数[ “日”];
<?php
ini_set('date.timezone', 'Europe/London');
$selected_date = $GET["date"];
$host="localhost"; //replace with database hostname
$username="user"; //replace with database username
$password="password"; //replace with database password
$db_name="db_name"; //replace with database name
$con=mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");
//include("user_control.php");
session_start();
$uid = $_SESSION['user'];
$sql = "select users.id,
degree.degree_id,
degree.degree_title,
modules.module_id,
modules.degree_id,
modules.title,
LectureRoom.code,
LectureRoom.date,
LectureRoom.time,
LectureRoom.end_time
from LectureRoom
JOIN modules ON modules.module_id = LectureRoom.module_id
JOIN degree ON degree.degree_id = modules.degree_id
JOIN users ON users.degree_id = degree.degree_id
WHERE users.id = '32' AND DATE(LectureRoom.date)= '$selected_date'; ";
$result = mysql_query($sql);
$json = array();
if(mysql_num_rows($result)){
while($row=mysql_fetch_assoc($result)){
$json[]=$row;
}
}
mysql_close($con);
echo json_encode($json);
?>
此时任何帮助,将不胜感激。先谢谢你。
它是'$ _GET',而不是'$ GET':http://php.net/manual/en/reserved.variables.get.php – adhirajsinghchauhan