首頁(yè) 猿問(wèn) Android /...

Android / MySQL：Spinner不填充MySQL中的數(shù)據(jù)

PHP

ibeautiful 2022-08-05 15:36:25

我的代碼有問(wèn)題。我已經(jīng)創(chuàng)建了一個(gè)從MySQL數(shù)據(jù)庫(kù)填充的微調(diào)器。PHP代碼似乎根本沒(méi)有問(wèn)題，因?yàn)槲疫\(yùn)行鏈接“l(fā)ocalhost/latihan1/menu/php”，json字符串將顯示。json 顯示如下：{“result”：[{“username”：“haha”，“name”：“Bus Bisnis”，“course”：“math”，“session”：“20119”}，{“username”：“hihi”，“name”：“Bus Ace”，“course”：“fizik”，“session”：“12817”}，{“username”：“m_ridwan”，“name”：“Ridwan”，“course”：“Komputer”，“session”：“1920”}，{“username”：“m_iqbal”，“name”：“Iqbal”，“course”：“Sains”，“session”：“2021”}]}但是當(dāng)我打開(kāi)應(yīng)用程序時(shí)，微調(diào)器不會(huì)顯示數(shù)據(jù)。我不知道為什么。以下是我的代碼爪哇島公共類(lèi) MainActivity 擴(kuò)展 AppCompatActivity 實(shí)現(xiàn) Spinner.OnItemSelectedListener{ private Spinner spinner; private ArrayList<String> students; //JSON Array private JSONArray result; private TextView textViewName; private TextView textViewCourse; private TextView textViewSession; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //Initializing the ArrayList students = new ArrayList<String>(); spinner = findViewById(R.id.spinner); spinner.setOnItemSelectedListener(this); textViewName = findViewById(R.id.textViewName); textViewCourse = findViewById(R.id.textViewCourse); textViewSession = findViewById(R.id.textViewSession); getData(); } private void getData(){ StringRequest stringRequest = new StringRequest(Config.DATA_URL, new Response.Listener<String>() { @Override public void onResponse(String response) { JSONObject j = null; try { j = new JSONObject(response); result = j.getJSONArray(Config.JSON_ARRAY); getStudents(result); } catch (JSONException e) { e.printStackTrace(); } }

查看完整描述

1 回答

慕姐8265434

TA貢獻(xiàn)1813條經(jīng)驗(yàn) 獲得超2個(gè)贊

我在我的安卓工作室里執(zhí)行了你的代碼。我看起來(lái)您的網(wǎng)絡(luò)調(diào)用無(wú)法獲取數(shù)據(jù)（結(jié)果保持為空）。檢查我的代碼以供參考。我用靜態(tài)數(shù)據(jù)替換了您的網(wǎng)絡(luò)呼叫。

package com.attiq.testapp;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.Spinner;

import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import com.google.gson.Gson;

import com.google.gson.JsonArray;

import com.google.gson.JsonObject;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import java.util.ArrayList;

public class Main5Activity extends AppCompatActivity implements Spinner.OnItemSelectedListener {

private Spinner spinner;

private ArrayList<String> students;

//JSON Array

private JSONArray result;

private TextView textViewName;

private TextView textViewCourse;

private TextView textViewSession;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main5);

//Initializing the ArrayList

students = new ArrayList<String>();

spinner = findViewById(R.id.spinner);

spinner.setOnItemSelectedListener(this);

textViewName = findViewById(R.id.textViewName);

textViewCourse = findViewById(R.id.textViewCourse);

textViewSession = findViewById(R.id.textViewSession);

getData();

}

private void getData(){

String json= "{\"result\":[{\"username\":\"haha\",\"name\":\"Bus Bisnis\",\"course\":\"math\",\"session\":\"20119\"},{\"username\":\"hihi\",\"name\":\"Bus Ace\",\"course\":\"fizik\",\"session\":\"12817\"},{\"username\":\"m_ridwan\",\"name\":\"Ridwan\",\"course\":\"Komputer\",\"session\":\"1920\"},{\"username\":\"m_iqbal\",\"name\":\"Iqbal\",\"course\":\"Sains\",\"session\":\"2021\"}]}";

try {

JSONObject jsonObject = new JSONObject(json);

result= jsonObject.getJSONArray("result");

getStudents(result);

} catch (Exception e){

e.printStackTrace();

}

private void getStudents(JSONArray j) {

for (int i = 0; i < j.length(); i++) {

try {

JSONObject json = j.getJSONObject(i);

students.add(json.getString(Config.TAG_USERNAME));

} catch (JSONException e) {

e.printStackTrace();

}

spinner.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, students));

}

private String getName(int position) {

String name = "";

try {

JSONObject json = result.getJSONObject(position);

name = json.getString(Config.TAG_NAME);

} catch (JSONException e) {

e.printStackTrace();

}

return name;

}

private String getCourse(int position) {

String course = "";

try {

JSONObject json = result.getJSONObject(position);

course = json.getString(Config.TAG_COURSE);

} catch (JSONException e) {

e.printStackTrace();

}

return course;

}

private String getSession(int position) {

String session = "";

try {

JSONObject json = result.getJSONObject(position);

session = json.getString(Config.TAG_SESSION);

} catch (JSONException e) {

e.printStackTrace();

}

return session;

}

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

//Setting the values to textviews for a selected item

textViewName.setText(getName(position));

textViewCourse.setText(getCourse(position));

textViewSession.setText(getSession(position));

}

@Override

public void onNothingSelected(AdapterView<?> parent) {

textViewName.setText("");

textViewCourse.setText("");

textViewSession.setText("");

}

反對(duì) 回復(fù) 2022-08-05

1 回答
0 關(guān)注
88 瀏覽

關(guān)注

添加回答

舉報(bào)

0/150

提交

取消

使用 Ctrl+D 可將網(wǎng)站添加到書(shū)簽

微信客服

購(gòu)課補(bǔ)貼
聯(lián)系客服咨詢(xún)優(yōu)惠詳情

幫助反饋 APP下載

慕課網(wǎng)APP
您的移動(dòng)學(xué)習(xí)伙伴

公眾號(hào)

掃描二維碼
關(guān)注慕課網(wǎng)微信公眾號(hào)

第七色在线视频,2021少妇久久久久久久久久,亚洲欧洲精品成人久久av18,亚洲国产精品特色大片观看完整版,孙宇晨将参加特朗普的晚宴

熱搜

最近搜索清空

Android / MySQL：Spinner不填充MySQL中的數(shù)據(jù)

Android / MySQL：Spinner不填充MySQL中的數(shù)據(jù)

1 回答

添加回答