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我是Android Studio和Java的初學者，我幾乎完成了我的第一個Android應用程序，但是，我試圖添加5個以上的問題，但是當我添加問題6它沒有出現。下面是從我DbHelper.java類的代碼：在Android遊戲中添加一個問題
package com.example.triviality;
import java.util.ArrayList;
import java.util.List;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DbHelper extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "triviaQuiz";
// tasks table name
private static final String TABLE_QUEST = "quest";
// tasks Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_QUES = "question";
private static final String KEY_ANSWER = "answer"; //correct option
private static final String KEY_OPTA= "opta"; //option a
private static final String KEY_OPTB= "optb"; //option b
private static final String KEY_OPTC= "optc"; //option c
private SQLiteDatabase dbase;
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
dbase=db;
String sql = "CREATE TABLE IF NOT EXISTS " + TABLE_QUEST + " ("
+ KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_QUES
+ " TEXT, " + KEY_ANSWER+ " TEXT, "+KEY_OPTA +" TEXT, "
+KEY_OPTB +" TEXT, "+KEY_OPTC+" TEXT)";
db.execSQL(sql);
addQuestions();
db.close();
}
private void addQuestions()
{
Question q1=new Question("Which company is the largest manufacturer" +
" of network equipment?","HP", "IBM", "CISCO", "CISCO");
this.addQuestion(q1);
Question q2=new Question("Which of the following is NOT " +
"an operating system?", "SuSe", "BIOS", "DOS", "BIOS");
this.addQuestion(q2);
Question q3=new Question("Which of the following is the fastest" +
" writable memory?","RAM", "FLASH","Register","Register");
this.addQuestion(q3);
Question q4=new Question("Which of the following device" +
" regulates internet traffic?", "Router", "Bridge", "Hub","Router");
this.addQuestion(q4);
Question q5=new Question("Which of the following is NOT an" +
" interpreted language?","Ruby","Python","BASIC","BASIC");
this.addQuestion(q5);
Question q6 = new Question("2+2 is equal to" +
" which of the following?","0","22","4","4");
this.addQuestion(q6);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldV, int newV) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_QUEST);
// Create tables again
onCreate(db);
}
// Adding new question
public void addQuestion(Question quest) {
//SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_QUES, quest.getQUESTION());
values.put(KEY_ANSWER, quest.getANSWER());
values.put(KEY_OPTA, quest.getOPTA());
values.put(KEY_OPTB, quest.getOPTB());
values.put(KEY_OPTC, quest.getOPTC());
// Inserting Row
dbase.insert(TABLE_QUEST, null, values);
}
public List<Question> getAllQuestions() {
List<Question> quesList = new ArrayList<Question>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_QUEST;
dbase=this.getReadableDatabase();
Cursor cursor = dbase.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Question quest = new Question();
quest.setID(cursor.getInt(0));
quest.setQUESTION(cursor.getString(1));
quest.setANSWER(cursor.getString(2));
quest.setOPTA(cursor.getString(3));
quest.setOPTB(cursor.getString(4));
quest.setOPTC(cursor.getString(5));
quesList.add(quest);
} while (cursor.moveToNext());
}
// return quest list
return quesList;
}
public int rowcount()
{
int row=0;
String selectQuery = "SELECT * FROM " + TABLE_QUEST;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
row=cursor.getCount();
return row;
}
}
我更改代碼從這個：
private void addQuestions()
{
Question q1=new Question("Which company is the largest manufacturer" +
" of network equipment?","HP", "IBM", "CISCO", "CISCO");
this.addQuestion(q1);
Question q2=new Question("Which of the following is NOT " +
"an operating system?", "SuSe", "BIOS", "DOS", "BIOS");
this.addQuestion(q2);
Question q3=new Question("Which of the following is the fastest" +
" writable memory?","RAM", "FLASH","Register","Register");
this.addQuestion(q3);
Question q4=new Question("Which of the following device" +
" regulates internet traffic?", "Router", "Bridge", "Hub","Router");
this.addQuestion(q4);
Question q5=new Question("Which of the following is NOT an" +
" interpreted language?","Ruby","Python","BASIC","BASIC");
this.addQuestion(q5);
}
這一個，我嘗試添加問題6，但它並沒有顯示出來：
private void addQuestions()
{
Question q1=new Question("Which company is the largest manufacturer" +
" of network equipment?","HP", "IBM", "CISCO", "CISCO");
this.addQuestion(q1);
Question q2=new Question("Which of the following is NOT " +
"an operating system?", "SuSe", "BIOS", "DOS", "BIOS");
this.addQuestion(q2);
Question q3=new Question("Which of the following is the fastest" +
" writable memory?","RAM", "FLASH","Register","Register");
this.addQuestion(q3);
Question q4=new Question("Which of the following device" +
" regulates internet traffic?", "Router", "Bridge", "Hub","Router");
this.addQuestion(q4);
Question q5=new Question("Which of the following is NOT an" +
" interpreted language?","Ruby","Python","BASIC","BASIC");
this.addQuestion(q5);
Question q6 = new Question("2+2 is equal to" +
" which of the following?","0","22","4","4");
this.addQuestion(q6);
}
有人能幫我嗎？我正在使用的教程是從這個website，我正在使用的代碼可以從這個link。
按'不顯示'你的意思是你沒有看到數據庫中的問題？ – zgc7009
你需要發佈更多的代碼並更好地解釋。比如'addQuestion（）'實際上做了什麼以及你想如何顯示這些。 – codeMagic
codeMagic不，我的意思是它沒有出現，當我運行應用程序，我發佈了更多的代碼 –