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Я создаю андроид проект, приложение викториныДубликат случайного числа Android
и когда я пытаюсь случайным образом идентификатора дублируется я не знаю, как это исправить мне нужна программа для генерации случайного номер без дублирования
Hers мой код активность
package com.example.testing;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Random;
import java.util.Timer;
import java.util.concurrent.TimeUnit;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Typeface;
import android.media.MediaPlayer;
import android.os.Build;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class QuestionActivity extends Activity{
ArrayList<Question> quesList;
int score = 0;
int qid = 0;
int lives = 5;
Question currentQ;
TextView txtQuestion, times, scored, livess;
Button button1, button2, button3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
QuizHelper db = new QuizHelper(this); // my question bank class
quesList = db.getAllQuestions();
Random random = new Random();// this will fetch all quetonall questions
currentQ = quesList.get(random.nextInt(quesList.size())); // the current question
txtQuestion = (TextView) findViewById(R.id.txtQuestion);
// the textview in which the question will be displayed
// the three buttons,
// the idea is to set the text of three buttons with the options from question bank
button1 = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button2);
button3 = (Button) findViewById(R.id.button3);
livess = (TextView) findViewById(R.id.livess);
// the textview in which will be displayed
scored = (TextView) findViewById(R.id.score);
// the timer
times = (TextView) findViewById(R.id.timers);
// method which will set the things up for our game
setQuestionView();
times.setText("00:02:00");
// A timer of 60 seconds to play for, with an interval of 1 second (1000 milliseconds)
CounterClass timer = new CounterClass(60000, 1000);
timer.start();
// button click listeners
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// passing the button text to other method
// to check whether the anser is correct or not
// same for all three buttons
getAnswer(button1.getText().toString());
}
});
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getAnswer(button2.getText().toString());
}
});
button3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getAnswer(button3.getText().toString());
}
});
}
public void getAnswer(String AnswerString) {
if (currentQ.getANSWER().equals(AnswerString)) {
// if conditions matches increase the int (score) by 1
// and set the text of the score view
score++;
scored.setText("Score : " + score);
} else if(lives > 1){
lives--;
livess.setText("Lives: " + lives);
}
else {
Intent intent = new Intent(QuestionActivity.this,
ResultActivity.class);
Bundle b = new Bundle();
b.putInt("score", score); // Your score
intent.putExtras(b); // Put your score to your next
startActivity(intent);
finish();
}
{
}
if (qid < 20) {
// if questions are not over then do this
Random random = new Random();
currentQ = quesList.get(random.nextInt(quesList.size()));
setQuestionView();
} else {
// if over do this
Intent intent = new Intent(QuestionActivity.this,
ResultActivity.class);
Bundle b = new Bundle();
b.putInt("score", score); // Your score
intent.putExtras(b); // Put your score to your next
startActivity(intent);
finish();
}
}
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
@SuppressLint("NewApi")
public class CounterClass extends CountDownTimer {
public CounterClass(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
// TODO Auto-generated constructor stub
}
@Override
public void onFinish() {
times.setText("Time is up");
Intent intent = new Intent(QuestionActivity.this,
Result_Activity_TimesUp.class);
Bundle b = new Bundle();
b.putInt("score", score); // Your score
intent.putExtras(b); // Put your score to your next
startActivity(intent);
finish();
}
@Override
public void onTick(long millisUntilFinished) {
// TODO Auto-generated method stub
long millis = millisUntilFinished;
String hms = String.format(
"%02d:%02d:%02d",
TimeUnit.MILLISECONDS.toHours(millis),
TimeUnit.MILLISECONDS.toMinutes(millis)
- TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS
.toHours(millis)),
TimeUnit.MILLISECONDS.toSeconds(millis)
- TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS
.toMinutes(millis)));
System.out.println(hms);
times.setText(hms);
}
}
private void setQuestionView() {
// the method which will put all things together
txtQuestion.setText(currentQ.getQUESTION());
button1.setText(currentQ.getOPTA());
button2.setText(currentQ.getOPTB());
button3.setText(currentQ.getOPTC());
qid++;
}
}
Heres мой базы данных
package com.example.testing;
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 QuizHelper extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 3;
// Database Name
private static final String DATABASE_NAME = "mathsone";
// tasks table name
private static final String TABLE_QUEST = "quest";
// tasks Table Columns names
private static final String KEY_ID = "qid";
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 QuizHelper(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);
addQuestion();
// db.close();
}
private void addQuestion() {
Question q1 = new Question("1. 5+2 = ?", "7", "8", "6", "7");
this.addQuestion(q1);
Question q2 = new Question("2. 2+18 = ?", "18", "19", "20", "20");
this.addQuestion(q2);
Question q3 = new Question("3. 10-3 = ?", "6", "7", "8", "7");
this.addQuestion(q3);
Question q4 = new Question("4. 5+7 = ?", "12", "13", "14", "12");
this.addQuestion(q4);
Question q5 = new Question("5. 3-1 = ?", "1", "3", "2", "2");
this.addQuestion(q5);
Question q6 = new Question("6. 0+1 = ?", "1", "0", "10", "1");
this.addQuestion(q6);
Question q7 = new Question("7. 9-9 = ?", "0", "9", "1", "0");
this.addQuestion(q7);
Question q8 = new Question("8. 3+6 = ?", "8", "7", "9", "9");
this.addQuestion(q8);
Question q9 = new Question("9. 1+5 = ?", "6", "7", "5", "6");
this.addQuestion(q9);
Question q10 = new Question("10. 7-5 = ?", "3", "2", "6", "2");
this.addQuestion(q10);
Question q11 = new Question("11. 7-2 = ?", "7", "6", "5", "5");
this.addQuestion(q11);
Question q12 = new Question("12. 3+5 = ?", "8", "7", "5", "8");
this.addQuestion(q12);
Question q13 = new Question("13. 0+6 = ?", "7", "6", "5", "6");
this.addQuestion(q13);
Question q14 = new Question("14. 12-10 = ?", "1", "2", "3", "2");
this.addQuestion(q14);
Question q15 = new Question("15. 12+2 = ?", "14", "15", "16", "14");
this.addQuestion(q15);
Question q16 = new Question("16. 2-1 = ?", "2", "1", "0", "1");
this.addQuestion(q16);
Question q17 = new Question("17. 6-6 = ?", "6", "12", "0", "0");
this.addQuestion(q17);
Question q18 = new Question("18. 5-1 = q?", "4", "3", "2", "4");
this.addQuestion(q18);
Question q19 = new Question("19. 4+2 = 19?", "6", "7", "5", "6");
this.addQuestion(q19);
Question q20 = new Question("20. 5+1 = ?", "6", "7", "5", "6");
this.addQuestion(q20);
Question q21 = new Question("5-4 = ?", "5", "4", "1", "1");
this.addQuestion(q21);
// END
}
@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 ArrayList<Question> getAllQuestions() {
ArrayList<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;
}
}
«Мне нужна моя программа, чтобы сгенерировать случайное число без какой-либо дублирование "- если вы помещаете это ограничение на это, тогда это не случайно. Вы должны уточнить свое требование более точно. –
Сделайте одну вещь, создайте карту hasmap Вопроса и логическую, и если этот вопрос представлен, положите значение как true else false. Теперь, когда вы вызываете метод random(), проверьте, установлено ли значение boolean равным true или false, если false показывает, что пользователь снова вызывает случайный случай. – dex
http://stackoverflow.com/questions/1519736/random-shuffling-of-an-array – CommonsWare