Error Array "java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0"

Question

1.00/5 (1 vote)

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What is "java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0"? i don't know how to fix it, :(

Logcat

05-02 14:28:47.405: D/AndroidRuntime(556): Shutting down VM
05-02 14:28:47.405: W/dalvikvm(556): threadid=1: thread exiting with uncaught exception (group=0x41ce5700)
05-02 14:28:47.420: E/AndroidRuntime(556): FATAL EXCEPTION: main
05-02 14:28:47.420: E/AndroidRuntime(556): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.quizjavatest/com.example.quizjavatest.MainActivity}: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
05-02 14:28:47.420: E/AndroidRuntime(556): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at android.app.ActivityThread.access$700(ActivityThread.java:159)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at android.os.Handler.dispatchMessage(Handler.java:99)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at android.os.Looper.loop(Looper.java:176)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at android.app.ActivityThread.main(ActivityThread.java:5419)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at java.lang.reflect.Method.invokeNative(Native Method)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at java.lang.reflect.Method.invoke(Method.java:525)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at dalvik.system.NativeStart.main(Native Method)
05-02 14:28:47.420: E/AndroidRuntime(556): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
05-02 14:28:47.420: E/AndroidRuntime(556): 	at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at java.util.ArrayList.get(ArrayList.java:308)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at com.example.quizjavatest.MainActivity.onCreate(MainActivity.java:36)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at android.app.Activity.performCreate(Activity.java:5372)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
05-02 14:28:47.420: E/AndroidRuntime(556): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
05-02 14:28:47.420: E/AndroidRuntime(556): 	... 11 more

DbHelper

Java

package com.example.quizjavatest;

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;
import android.graphics.BitmapFactory;

public class DbHelper extends SQLiteOpenHelper{
	int id = 0;
	private Context mContext;
	private static final int DATABASE_VERSION = 1;
	// Database Name
	private static final String DATABASE_NAME = "PediaKids";
	// tasks table name
	
	private static final String TABLE_QUEST = "planet";

	// tasks Table Columns names
	private static final String KEY_ID = "id";
	private static final String KEY_IMG = "img";
	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);
		mContext = context;
		
	}
		@Override
		public void onCreate(SQLiteDatabase db) {
			
			dbase=db;
			String Sql = "CREATE TABLE IF NOT EXISTS " + TABLE_QUEST + " ( "
					+ KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "+ KEY_IMG + "BLOB NOT NULL," + KEY_QUES
					+ " TEXT, "  + KEY_OPTA +" TEXT, " + KEY_OPTB +" TEXT, "+KEY_OPTC+" TEXT," + KEY_ANSWER + " TEXT)";
			
			
			
			db.execSQL(Sql);
			addQuestion();
		
			
			//db.close();
		}
		private void addQuestion()
		{
			Question q1=new Question(BitmapFactory.decodeResource(mContext.getResources(), R.drawable.ic_launcher),"an operating system?", "SuSe", "BIOS", "DOS", "BIOS");
			this.addQuestion(q1);
			Question q2=new Question(BitmapFactory.decodeResource(mContext.getResources(), R.drawable.ic_launcher),"Which of the following is NOT  "," SuSe", "BIOS", "DOS", "BIOS");
			this.addQuestion(q2);
			Question q3=new Question(BitmapFactory.decodeResource(mContext.getResources(), R.drawable.ic_launcher),"Which of the following is the fastest","RAM", "FLASH","Register","Register");
			this.addQuestion(q3);
			Question q4=new Question(BitmapFactory.decodeResource(mContext.getResources(), R.drawable.ic_launcher),"Which of the following device", "Router", "Bridge", "Hub","Router");
			this.addQuestion(q4);
			Question q5=new Question(BitmapFactory.decodeResource(mContext.getResources(), R.drawable.ic_launcher),"Which of the following is NOT an" ,"Ruby","Python","BASIC","BASIC");
			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_IMG, Utility.getBytes(quest.getBitmap()));
			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
			//if else here
			
			String selectQuery = "SELECT * FROM " + TABLE_QUEST + " ORDER BY RANDOM() LIMIT 5";
			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.setImage(Utility.getPhoto(cursor.getBlob(1)));
					quest.setQUESTION(cursor.getString(2));
					quest.setANSWER(cursor.getString(3));
					quest.setOPTA(cursor.getString(4));
					quest.setOPTB(cursor.getString(5));
					quest.setOPTC(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;
		}
		

		
	}

MainActivity.java

Java

package com.example.quizjavatest;


import android.os.Bundle;
import android.app.Activity;
import java.util.List;
import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class MainActivity extends Activity  {

	List<Question> quesList;
	int score=0;
	int qid=0;
	ImageView quizimg; 
	Question currentQ;
	TextView txtQuestion;
	RadioButton rda, rdb, rdc;
	Button butNext;
			
@Override
	    
protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
	        
	        
	        DbHelper db=new DbHelper(this);
			quesList=db.getAllQuestions();
			currentQ=quesList.get(qid);
			quizimg=(ImageView) findViewById(R.id.ImgQuiz); //img quiz
			txtQuestion=(TextView)findViewById(R.id.textView1); //question
			rda=(RadioButton)findViewById(R.id.radio0); //option A
			rdb=(RadioButton)findViewById(R.id.radio1); //option B
			rdc=(RadioButton)findViewById(R.id.radio2); //option C
			butNext=(Button)findViewById(R.id.button1); //button next
			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<10){					
						currentQ=quesList.get(qid);
						setQuestionView();
					}else{
						Intent intent = new Intent(MainActivity.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();
					}
				}
			});
		}
		
		private void setQuestionView()
		{
			quizimg.setImageBitmap(currentQ.getBitmap());
			txtQuestion.setText(currentQ.getQUESTION());
			rda.setText(currentQ.getOPTA());
			rdb.setText(currentQ.getOPTB());
			rdc.setText(currentQ.getOPTC());
			qid++  ;
		}
}

Posted 1-May-15 17:59pm

JaironLanda

Updated 1-May-15 23:48pm

v4

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Comments

Richard MacCutchan 2-May-15 5:15am

Where is your MainActivity?

JaironLanda 2-May-15 5:49am

Question updated :)

Richard MacCutchan 2-May-15 6:03am

There is nothing obvious that I can see. You will need to use your debugger to try and identify exactly why it is not able to start.

Adrito adi 31-May-21 6:39am

quesList=db.getAllQuestions();
if(quesList!= null && quesList.size() !=0) {
currentQ=quesList.get(qid);
}

Adrito adi 31-May-21 6:46am

1999-2021

2 solutions

Solution 2

Exception is very clear that you have tried to access some index which does not exist in the respective collection. I have look into the MainActivity.java, and I have found the following glitch. You have tried to access the list contents without verifying the list(whether null or empty)

Java

quesList=db.getAllQuestions();
currentQ=quesList.get(qid); //bug

It should be :

Java

quesList=db.getAllQuestions();
if(quesList != null && quesList.size() !=0){
  currentQ=quesList.get(qid); 
}

Posted 6-May-15 21:50pm

Shubhashish_Mandal

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Shubhashish_Mandal · Accepted Answer · 2015-05-06T21:45:00

Exception is very clear that you have tried to access some index which is not available in the list. I have look into the MainActivity.java I have found the following glitch. You are trying to fetch data from a list without verifying the list(whether null or empty )

Java

quesList=db.getAllQuestions();
currentQ=quesList.get(qid);// bug

It should be

Java

quesList=db.getAllQuestions();
if(quesList!= null && quesList.size() !=0) {
   currentQ=quesList.get(qid);
}

Error Array "java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0"

2 solutions

Solution 1

Solution 2

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