samedi 27 février 2016

Android SQLite error: Couldn't read row 0, col 6 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it

I'm trying to make a quiz application where it get's data (questions) from a SQLite database. I'm running into this error.

This is the logcat.

02-27 21:24:49.124 3133-3133/com.turnerfentondeca.decaturnerfenton E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                 Process: com.turnerfentondeca.decaturnerfenton, PID: 3133
                                                                                 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.turnerfentondeca.decaturnerfenton/com.turnerfentondeca.decaturnerfenton.QuizActivity}: java.lang.IllegalStateException: Couldn't read row 0, col 6 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.
                                                                                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
                                                                                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                                     at android.app.ActivityThread.-wrap11(ActivityThread.java)
                                                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                                     at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                     at android.os.Looper.loop(Looper.java:148)
                                                                                     at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                                                  Caused by: java.lang.IllegalStateException: Couldn't read row 0, col 6 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.
                                                                                     at android.database.CursorWindow.nativeGetString(Native Method)
                                                                                     at android.database.CursorWindow.getString(CursorWindow.java:438)
                                                                                     at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
                                                                                     at com.turnerfentondeca.decaturnerfenton.DbHelper.getAllQuestions(DbHelper.java:96)
                                                                                     at com.turnerfentondeca.decaturnerfenton.QuizActivity.onCreate(QuizActivity.java:30)
                                                                                     at android.app.Activity.performCreate(Activity.java:6237)
                                                                                     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
                                                                                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
                                                                                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                                                                                     at android.app.ActivityThread.-wrap11(ActivityThread.java) 
                                                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                                                                                     at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                                     at android.os.Looper.loop(Looper.java:148) 
                                                                                     at android.app.ActivityThread.main(ActivityThread.java:5417) 
                                                                                     at java.lang.reflect.Method.invoke(Native Method) 
                                                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                                                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 

Here is my DbHelper.java class

package com.turnerfentondeca.decaturnerfenton;
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 static final String KEY_OPTD= "optd"; //option d
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, "+KEY_OPTD +" 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", "DECA", "C");
    this.addQuestion(q1);
    Question q2=new Question("Which of the following is NOT " +
            "an operating system?", "SuSe", "BIOS", "DOS", "DECA", "B");
    this.addQuestion(q2);
    Question q3=new Question("Which of the following is the fastest" +
            " writable memory?","RAM", "FLASH","Register", "DECA", "C");
    this.addQuestion(q3);
    Question q4=new Question("Which of the following device" +
            " regulates internet traffic?","Router", "Bridge", "Hub", "DECA", "A");
    this.addQuestion(q4);
    Question q5=new Question("Which of the following is NOT an" +
            " interpreted language?","Ruby","Python","BASIC","DECA", "C");
    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());
    values.put(KEY_OPTD, quest.getOPTD());
    // 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));
            quest.setOPTD(cursor.getString(6));
            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;
}
}

This is my questions.java class

package com.turnerfentondeca.decaturnerfenton;

public class Question {
private int ID;
private String QUESTION;
private String OPTA;
private String OPTB;
private String OPTC;
private String OPTD;
private String ANSWER;

public Question () {
    ID = 0;
    QUESTION="";
    OPTA="";
    OPTB="";
    OPTC="";
    OPTD="";
    ANSWER="";
}

public Question (String qUESTION, String oPTA,String oPTB,String oPTC,String oPTD, String aNSWER) {
    QUESTION=qUESTION;
    OPTA=oPTA;
    OPTB=oPTB;
    OPTC=oPTC;
    OPTD=oPTD;
    ANSWER=aNSWER;
}

public int getID() {
    return ID;
}
public String getQUESTION() {
    return QUESTION;
}
public String getOPTA() {
    return OPTA;
}
public String getOPTB() {
    return OPTB;
}
public String getOPTC() {
    return OPTC;
}
public String getOPTD() {
    return OPTD;
}
public String getANSWER() {
    return ANSWER;
}

public void setID(int id) {
    ID = id;
}
public void setQUESTION(String qUESTION) {
    QUESTION = qUESTION;
}
public void setOPTA(String oPTA) {
    OPTA = oPTA;
}
public void setOPTB(String oPTB) {
    OPTB = oPTB;
}
public void setOPTC(String oPTC) {
    OPTC = oPTC;
}
public void setOPTD(String oPTD) {
    OPTD = oPTD;
}
public void setANSWER(String aNSWER) {
    ANSWER = aNSWER;
}
}

And lastly, here is the QuizActivity.java class

package com.turnerfentondeca.decaturnerfenton;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class QuizActivity extends Activity {
List<Question> quesList;
int score=0;
int qid=0;
Question currentQ;
TextView txtQuestion;
RadioButton rda, rdb, rdc, rdd;
Button butNext;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_quiz);
    DbHelper db=new DbHelper(this);
    quesList=db.getAllQuestions();
    currentQ=quesList.get(qid);
    txtQuestion=(TextView)findViewById(R.id.textView1);
    rda=(RadioButton)findViewById(R.id.radio0);
    rdb=(RadioButton)findViewById(R.id.radio1);
    rdc=(RadioButton)findViewById(R.id.radio2);
    rdd=(RadioButton)findViewById(R.id.radio3);
    butNext=(Button)findViewById(R.id.button1);
    setQuestionView();
    butNext.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            RadioGroup grp=(RadioGroup)findViewById(R.id.radioGroup1);
            RadioButton answer=(RadioButton)findViewById(grp.getCheckedRadioButtonId());
            Log.d("yourans", currentQ.getANSWER()+" "+answer.getText());
            if(currentQ.getANSWER().equals(answer.getText()))
            {
                score++;
                Log.d("score", "Your score"+score);
            }
            if(qid<5){
                currentQ=quesList.get(qid);
                setQuestionView();
            }else{
                Intent intent = new Intent(QuizActivity.this, ResultActivity.class);
                Bundle b = new Bundle();
                b.putInt("score", score); //Your score
                intent.putExtras(b); //Put your score to your next Intent
                startActivity(intent);
                finish();
            }
        }
    });
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main_screen, menu);
    return true;
}
private void setQuestionView()
{
    txtQuestion.setText(currentQ.getQUESTION());
    rda.setText(currentQ.getOPTA());
    rdb.setText(currentQ.getOPTB());
    rdc.setText(currentQ.getOPTC());
    rdd.setText(currentQ.getOPTD());
    qid++;
}
}

I have been able to figure out that the mistake in the code is the DbHelper.java class in this line

quest.setOPTD(cursor.getString(6));

I don't know how to solve this. Can someone please help. Thanks in advance

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