My problem is java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0. I don't know to fix this error and i not found any problem on my array. I'm newbie in android. I hope you all understand. Maybe this is cause error on my error values.put(KEY_IMG, Utility.getBytes(quest.getBitmap()));. sorry my english.
UPDATE
database problem cause java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
MainActivity.java
package com.example.quizjavatest;
import java.util.ArrayList;
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<5){
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++ ;
}
}
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{
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," + 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_ID, quest.getID());
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>();
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;
}
}
Question.java
package com.example.quizjavatest;
import android.graphics.Bitmap;
public class Question {
private int ID;
private Bitmap bmp;
//byte[] _image;
private String QUESTION;
private String OPTA;
private String OPTB;
private String OPTC;
private String ANSWER;
public Question()
{
/*ID=0;
QUESTION="";
OPTA="";
OPTB="";
OPTC="";
ANSWER="";*/
}
public Question(Bitmap img, String qUESTION, String oPTA, String oPTB, String oPTC,
String aNSWER ) {
bmp = img;
QUESTION = qUESTION;
OPTA = oPTA;
OPTB = oPTB;
OPTC = oPTC;
ANSWER = aNSWER;
}
public int getID()
{
return ID;
}
public Bitmap getBitmap(){
return bmp;
}
public void setImage(Bitmap img){
bmp = img;
}
/*public byte[] getImage(){
return _image;
}*/
public String getQUESTION() {
return QUESTION;
}
public String getOPTA() {
return OPTA;
}
public String getOPTB() {
return OPTB;
}
public String getOPTC() {
return OPTC;
}
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 setANSWER(String aNSWER) {
ANSWER = aNSWER;
}
}
Utility.java
package com.example.quizjavatest;
import java.io.ByteArrayOutputStream;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
public class Utility {
// convert from bitmap to byte array
public static byte[] getBytes(Bitmap bitmap) {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(CompressFormat.PNG, 0, stream);
return stream.toByteArray();
}
// convert from byte array to bitmap
public static Bitmap getPhoto(byte[] image) {
return BitmapFactory.decodeByteArray(image, 0, image.length);
}
}
Logcat
05-03 10:46:26.520: W/dalvikvm(9053): threadid=1: thread exiting with uncaught exception (group=0x41cff700)
05-03 10:46:26.585: E/AndroidRuntime(9053): FATAL EXCEPTION: main
05-03 10:46:26.585: E/AndroidRuntime(9053): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.quizjavatest/com.example.quizjavatest.MainActivity}: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
05-03 10:46:26.585: E/AndroidRuntime(9053): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295)
05-03 10:46:26.585: E/AndroidRuntime(9053): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
05-03 10:46:26.585: E/AndroidRuntime(9053): at android.app.ActivityThread.access$700(ActivityThread.java:159)
05-03 10:46:26.585: E/AndroidRuntime(9053): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
05-03 10:46:26.585: E/AndroidRuntime(9053): at android.os.Handler.dispatchMessage(Handler.java:99)
05-03 10:46:26.585: E/AndroidRuntime(9053): at android.os.Looper.loop(Looper.java:176)
05-03 10:46:26.585: E/AndroidRuntime(9053): at android.app.ActivityThread.main(ActivityThread.java:5419)
05-03 10:46:26.585: E/AndroidRuntime(9053): at java.lang.reflect.Method.invokeNative(Native Method)
05-03 10:46:26.585: E/AndroidRuntime(9053): at java.lang.reflect.Method.invoke(Method.java:525)
05-03 10:46:26.585: E/AndroidRuntime(9053): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
05-03 10:46:26.585: E/AndroidRuntime(9053): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
05-03 10:46:26.585: E/AndroidRuntime(9053): at dalvik.system.NativeStart.main(Native Method)
05-03 10:46:26.585: E/AndroidRuntime(9053): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
05-03 10:46:26.585: E/AndroidRuntime(9053): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
05-03 10:46:26.585: E/AndroidRuntime(9053): at java.util.ArrayList.get(ArrayList.java:308)
05-03 10:46:26.585: E/AndroidRuntime(9053): at com.example.quizjavatest.MainActivity.onCreate(MainActivity.java:36)
05-03 10:46:26.585: E/AndroidRuntime(9053): at android.app.Activity.performCreate(Activity.java:5372)
05-03 10:46:26.585: E/AndroidRuntime(9053): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
05-03 10:46:26.585: E/AndroidRuntime(9053): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
05-03 10:46:26.585: E/AndroidRuntime(9053): ... 11 more
![Prime Path[POJ3126] [SPFA/BFS]](https://oscimg.oschina.net/oscnet/e1200f32e838bf1d387d671dc8e6894c37d.jpg "Prime Path[POJ3126] [SPFA/BFS]")
