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使用數據庫SQlite的測驗

[英]A quiz using DataBase SQlite

 原文  2014-04-05 09:58:41  1   2    java/ android/ database/ eclipse/ sqlite

問題描述

我正在嘗試制作一個包含至少100個問題的android問答游戲，我在網上找到了一個使用數據庫存儲問題和答案的教程，我下載了源代碼並將DBHelper.java文件復制到我的項目和所有東西中當我想添加一個新問題時，該問題運行良好，但是在向數據庫中添加任何內容時，我的應用程序會崩潰。 

package com.example.seenapp;

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("What is JP?","Jalur Pesawat", "Jack sParrow", "Jasa Programmer", "Jasa Programmer");
    this.addQuestion(q1);
    Question q2=new Question("where the JP place?", "Monas, Jakarta", "Gelondong, Bangun Tapan, bantul", "Gelondong, Bangun Tapan, bandul", "Gelondong, Bangun Tapan, bantul");
    this.addQuestion(q2);
    Question q3=new Question("who is CEO of the JP?","Usman and Jack", "Jack and Rully","Rully and Usman", "Rully and Usman" );
    this.addQuestion(q3);
    Question q4=new Question("what do you know about JP?", "JP is programmer home", "JP also realigy home", "all answer is true","all answer is true");
    this.addQuestion(q4);
    Question q5=new Question("what do you learn in JP?","Realigy","Programming","all answer is true","all answer is true");
    this.addQuestion(q5);
}
@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;
}
}

它試圖應對這段代碼 

Question q5=new Question("what do you learn in JP?","Realigy","Programming","all answer is true","all answer is true");
    this.addQuestion(q5);

並將數字更改為6，但它不起作用！ 謝謝

崩潰前的日志貓： 

04-05 06:15:24.311: E/SoundPool(378): error loading /system/media/audio/ui/Effect_Tick.ogg
04-05 06:15:24.321: W/AudioService(378): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
04-05 06:15:24.321: E/SoundPool(378): error loading /system/media/audio/ui/Effect_Tick.ogg
04-05 06:15:24.321: W/AudioService(378): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
04-05 06:15:24.331: E/SoundPool(378): error loading /system/media/audio/ui/Effect_Tick.ogg
04-05 06:15:24.331: W/AudioService(378): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
04-05 06:15:24.331: E/SoundPool(378): error loading /system/media/audio/ui/Effect_Tick.ogg
04-05 06:15:24.331: W/AudioService(378): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
04-05 06:15:24.341: E/SoundPool(378): error loading /system/media/audio/ui/Effect_Tick.ogg
04-05 06:15:24.341: W/AudioService(378): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg
04-05 06:15:24.341: E/SoundPool(378): error loading /system/media/audio/ui/KeypressStandard.ogg
04-05 06:15:24.351: W/AudioService(378): Soundpool could not load file: /system/media/audio/ui/KeypressStandard.ogg
04-05 06:15:24.351: E/SoundPool(378): error loading /system/media/audio/ui/KeypressSpacebar.ogg
04-05 06:15:24.351: W/AudioService(378): Soundpool could not load file: /system/media/audio/ui/KeypressSpacebar.ogg
04-05 06:15:24.351: E/SoundPool(378): error loading /system/media/audio/ui/KeypressDelete.ogg
04-05 06:15:24.351: W/AudioService(378): Soundpool could not load file: /system/media/audio/ui/KeypressDelete.ogg
04-05 06:15:24.361: E/SoundPool(378): error loading /system/media/audio/ui/KeypressReturn.ogg
04-05 06:15:24.361: W/AudioService(378): Soundpool could not load file: /system/media/audio/ui/KeypressReturn.ogg
04-05 06:15:24.361: E/SoundPool(378): error loading /system/media/audio/ui/KeypressInvalid.ogg
04-05 06:15:24.361: W/AudioService(378): Soundpool could not load file: /system/media/audio/ui/KeypressInvalid.ogg
04-05 06:15:24.361: W/AudioService(378): onLoadSoundEffects(), Error -1 while loading samples
04-05 06:15:24.411: D/AndroidRuntime(5083): Shutting down VM
04-05 06:15:24.411: W/dalvikvm(5083): threadid=1: thread exiting with uncaught exception (group=0xb1a43ba8)
04-05 06:15:24.431: E/AndroidRuntime(5083): FATAL EXCEPTION: main
04-05 06:15:24.431: E/AndroidRuntime(5083): Process: com.example.seenjeemapp, PID: 5083
04-05 06:15:24.431: E/AndroidRuntime(5083): java.lang.IllegalStateException: Could not execute method of the activity
04-05 06:15:24.431: E/AndroidRuntime(5083):     at android.view.View$1.onClick(View.java:3823)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at android.view.View.performClick(View.java:4438)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at android.view.View$PerformClick.run(View.java:18422)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at android.os.Handler.handleCallback(Handler.java:733)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at android.os.Handler.dispatchMessage(Handler.java:95)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at android.os.Looper.loop(Looper.java:136)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at android.app.ActivityThread.main(ActivityThread.java:5017)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at java.lang.reflect.Method.invokeNative(Native Method)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at java.lang.reflect.Method.invoke(Method.java:515)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at dalvik.system.NativeStart.main(Native Method)
04-05 06:15:24.431: E/AndroidRuntime(5083): Caused by: java.lang.reflect.InvocationTargetException
04-05 06:15:24.431: E/AndroidRuntime(5083):     at java.lang.reflect.Method.invokeNative(Native Method)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at java.lang.reflect.Method.invoke(Method.java:515)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at android.view.View$1.onClick(View.java:3818)
04-05 06:15:24.431: E/AndroidRuntime(5083):     ... 11 more
04-05 06:15:24.431: E/AndroidRuntime(5083): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 5, size is 5
04-05 06:15:24.431: E/AndroidRuntime(5083):     at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at java.util.ArrayList.get(ArrayList.java:308)
04-05 06:15:24.431: E/AndroidRuntime(5083):     at com.example.seenjeemapp.PlayActivity.AnswerCButton(PlayActivity.java:256)
04-05 06:15:24.431: E/AndroidRuntime(5083):     ... 14 more
04-05 06:15:24.471: W/ActivityManager(378):   Force finishing activity com.example.seenjeemapp/.PlayActivity
04-05 06:15:25.041: W/ActivityManager(378): Activity pause timeout for ActivityRecord{b22b2f78 u0 com.example.seenjeemapp/.PlayActivity t70 f}

2 個解決方案

解決方案1
 0  2014-04-05 11:42:09

Caused by: java.lang.IndexOutOfBoundsException: Invalid index 5, size is 5

那就出問題了。 

at java.util.ArrayList.get(ArrayList.java:308)
at com.example.seenjeemapp.PlayActivity.AnswerCButton(PlayActivity.java:256)

那邊

您的C按鈕（其事件處理程序）嘗試從5個元素的ArrayList中get(5) 。

ArrayList s（就像Java中所有已索引的集合一樣）從0開始索引，因此第五個元素（最后一個）在4之下（右）索引。 它是0、1、2、3、4。

這就是為什么您得到IndexOutOfBoundsException 。

導致該錯誤的代碼不在您發布的代碼范圍內，因此很難確定該錯誤，但是看起來負責處理C答案（或任何其他答案）的代碼對您添加了問題編號6的事實。您一定忽略了某些內容。

我強烈建議您學習使用Logcat，否則，一旦遇到嚴重錯誤，您將永遠處於黑暗中。

一些可能對您有用的鏈接：

解決方案2
 0  2014-04-05 11:52:46

根據您的logcat get方法，我們的arraylost越界越好。 如果數組包含n個項目，則get方法只能與n-1一起使用。

我看不到在哪里使用此get方法，因此您應該發布更多代碼。

你為什么要評論這行 

  SQLiteDatabase db = this.getWritableDatabase();

如何在不打開數據庫的情況下執行任何操作。

順便說一下，導致應用程序崩潰的錯誤不在此代碼中

一些其他提示可能不一定會導致崩潰，但是您應該練習在正確的時間和正確的范圍內關閉和打開數據庫和游標。

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