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@codinginflow
Created December 2, 2021 11:54
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Quiz App with SQLite Tutorial Part 5
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorBackground"
android:padding="16dp"
tools:context="com.codinginflow.myawesomequiz.QuizActivity">
<TextView
android:id="@+id/text_view_score"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Score: 0"
android:textColor="@android:color/black" />
<TextView
android:id="@+id/text_view_question_count"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/text_view_score"
android:text="Question: 1/x"
android:textColor="@android:color/black" />
<TextView
android:id="@+id/text_view_countdown"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:text="00:30"
android:textColor="@android:color/black"
android:textSize="40sp" />
<TextView
android:id="@+id/text_view_question"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@id/radio_group"
android:layout_marginBottom="16dp"
android:text="Here will be the question text\nHere will be the question text\nHere will be the question text"
android:textAlignment="center"
android:textColor="@android:color/black"
android:textSize="20sp" />
<RadioGroup
android:id="@+id/radio_group"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true">
<RadioButton
android:id="@+id/radio_button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Option 1" />
<RadioButton
android:id="@+id/radio_button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Option 2" />
<RadioButton
android:id="@+id/radio_button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Option 3" />
</RadioGroup>
<Button
android:id="@+id/button_confirm_next"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/radio_group"
android:layout_marginTop="16dp"
android:text="Confirm" />
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorBackground"
android:padding="16dp"
tools:context="com.codinginflow.myawesomequiz.StartingScreenActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:text="My Awesome Quiz"
android:textColor="@android:color/black"
android:textSize="35sp" />
<TextView
android:id="@+id/text_view_highscore"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@id/button_start_quiz"
android:layout_centerHorizontal="true"
android:layout_marginBottom="32dp"
android:text="Highscore: 0"
android:textSize="20sp" />
<Button
android:id="@+id/button_start_quiz"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Start Quiz" />
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="colorPrimary">#795548</color>
<color name="colorPrimaryDark">#5D4037</color>
<color name="colorAccent">#FFEB3B</color>
<color name="colorBackground">#BCAAA4</color>
</resources>
package com.codinginflow.myawesomequiz;
public class Question {
private String question;
private String option1;
private String option2;
private String option3;
private int answerNr;
public Question() {
}
public Question(String question, String option1, String option2, String option3, int answerNr) {
this.question = question;
this.option1 = option1;
this.option2 = option2;
this.option3 = option3;
this.answerNr = answerNr;
}
public String getQuestion() {
return question;
}
public void setQuestion(String question) {
this.question = question;
}
public String getOption1() {
return option1;
}
public void setOption1(String option1) {
this.option1 = option1;
}
public String getOption2() {
return option2;
}
public void setOption2(String option2) {
this.option2 = option2;
}
public String getOption3() {
return option3;
}
public void setOption3(String option3) {
this.option3 = option3;
}
public int getAnswerNr() {
return answerNr;
}
public void setAnswerNr(int answerNr) {
this.answerNr = answerNr;
}
}
package com.codinginflow.myawesomequiz;
import android.content.res.ColorStateList;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
import java.util.Collections;
import java.util.List;
public class QuizActivity extends AppCompatActivity {
private TextView textViewQuestion;
private TextView textViewScore;
private TextView textViewQuestionCount;
private TextView textViewCountDown;
private RadioGroup rbGroup;
private RadioButton rb1;
private RadioButton rb2;
private RadioButton rb3;
private Button buttonConfirmNext;
private ColorStateList textColorDefaultRb;
private List<Question> questionList;
private int questionCounter;
private int questionCountTotal;
private Question currentQuestion;
private int score;
private boolean answered;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quiz);
textViewQuestion = findViewById(R.id.text_view_question);
textViewScore = findViewById(R.id.text_view_score);
textViewQuestionCount = findViewById(R.id.text_view_question_count);
textViewCountDown = findViewById(R.id.text_view_countdown);
rbGroup = findViewById(R.id.radio_group);
rb1 = findViewById(R.id.radio_button1);
rb2 = findViewById(R.id.radio_button2);
rb3 = findViewById(R.id.radio_button3);
buttonConfirmNext = findViewById(R.id.button_confirm_next);
textColorDefaultRb = rb1.getTextColors();
QuizDbHelper dbHelper = new QuizDbHelper(this);
questionList = dbHelper.getAllQuestions();
questionCountTotal = questionList.size();
Collections.shuffle(questionList);
showNextQuestion();
buttonConfirmNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!answered) {
if (rb1.isChecked() || rb2.isChecked() || rb3.isChecked()) {
checkAnswer();
} else {
Toast.makeText(QuizActivity.this, "Please select an answer", Toast.LENGTH_SHORT).show();
}
} else {
showNextQuestion();
}
}
});
}
private void showNextQuestion() {
rb1.setTextColor(textColorDefaultRb);
rb2.setTextColor(textColorDefaultRb);
rb3.setTextColor(textColorDefaultRb);
rbGroup.clearCheck();
if (questionCounter < questionCountTotal) {
currentQuestion = questionList.get(questionCounter);
textViewQuestion.setText(currentQuestion.getQuestion());
rb1.setText(currentQuestion.getOption1());
rb2.setText(currentQuestion.getOption2());
rb3.setText(currentQuestion.getOption3());
questionCounter++;
textViewQuestionCount.setText("Question: " + questionCounter + "/" + questionCountTotal);
answered = false;
buttonConfirmNext.setText("Confirm");
} else {
finishQuiz();
}
}
private void checkAnswer() {
answered = true;
RadioButton rbSelected = findViewById(rbGroup.getCheckedRadioButtonId());
int answerNr = rbGroup.indexOfChild(rbSelected) + 1;
if (answerNr == currentQuestion.getAnswerNr()) {
score++;
textViewScore.setText("Score: " + score);
}
showSolution();
}
private void showSolution() {
rb1.setTextColor(Color.RED);
rb2.setTextColor(Color.RED);
rb3.setTextColor(Color.RED);
switch (currentQuestion.getAnswerNr()) {
case 1:
rb1.setTextColor(Color.GREEN);
textViewQuestion.setText("Answer 1 is correct");
break;
case 2:
rb2.setTextColor(Color.GREEN);
textViewQuestion.setText("Answer 2 is correct");
break;
case 3:
rb3.setTextColor(Color.GREEN);
textViewQuestion.setText("Answer 3 is correct");
break;
}
if (questionCounter < questionCountTotal) {
buttonConfirmNext.setText("Next");
} else {
buttonConfirmNext.setText("Finish");
}
}
private void finishQuiz() {
finish();
}
}
package com.codinginflow.myawesomequiz;
import android.provider.BaseColumns;
public final class QuizContract {
private QuizContract() {
}
public static class QuestionsTable implements BaseColumns {
public static final String TABLE_NAME = "quiz_questions";
public static final String COLUMN_QUESTION = "question";
public static final String COLUMN_OPTION1 = "option1";
public static final String COLUMN_OPTION2 = "option2";
public static final String COLUMN_OPTION3 = "option3";
public static final String COLUMN_ANSWER_NR = "answer_nr";
}
}
package com.codinginflow.myawesomequiz;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import com.codinginflow.myawesomequiz.QuizContract.*;
import java.util.ArrayList;
import java.util.List;
public class QuizDbHelper extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "MyAwesomeQuiz.db";
private static final int DATABASE_VERSION = 1;
private SQLiteDatabase db;
public QuizDbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
this.db = db;
final String SQL_CREATE_QUESTIONS_TABLE = "CREATE TABLE " +
QuestionsTable.TABLE_NAME + " ( " +
QuestionsTable._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
QuestionsTable.COLUMN_QUESTION + " TEXT, " +
QuestionsTable.COLUMN_OPTION1 + " TEXT, " +
QuestionsTable.COLUMN_OPTION2 + " TEXT, " +
QuestionsTable.COLUMN_OPTION3 + " TEXT, " +
QuestionsTable.COLUMN_ANSWER_NR + " INTEGER" +
")";
db.execSQL(SQL_CREATE_QUESTIONS_TABLE);
fillQuestionsTable();
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + QuestionsTable.TABLE_NAME);
onCreate(db);
}
private void fillQuestionsTable() {
Question q1 = new Question("A is correct", "A", "B", "C", 1);
addQuestion(q1);
Question q2 = new Question("B is correct", "A", "B", "C", 2);
addQuestion(q2);
Question q3 = new Question("C is correct", "A", "B", "C", 3);
addQuestion(q3);
Question q4 = new Question("A is correct again", "A", "B", "C", 1);
addQuestion(q4);
Question q5 = new Question("B is correct again", "A", "B", "C", 2);
addQuestion(q5);
}
private void addQuestion(Question question) {
ContentValues cv = new ContentValues();
cv.put(QuestionsTable.COLUMN_QUESTION, question.getQuestion());
cv.put(QuestionsTable.COLUMN_OPTION1, question.getOption1());
cv.put(QuestionsTable.COLUMN_OPTION2, question.getOption2());
cv.put(QuestionsTable.COLUMN_OPTION3, question.getOption3());
cv.put(QuestionsTable.COLUMN_ANSWER_NR, question.getAnswerNr());
db.insert(QuestionsTable.TABLE_NAME, null, cv);
}
public List<Question> getAllQuestions() {
List<Question> questionList = new ArrayList<>();
db = getReadableDatabase();
Cursor c = db.rawQuery("SELECT * FROM " + QuestionsTable.TABLE_NAME, null);
if (c.moveToFirst()) {
do {
Question question = new Question();
question.setQuestion(c.getString(c.getColumnIndex(QuestionsTable.COLUMN_QUESTION)));
question.setOption1(c.getString(c.getColumnIndex(QuestionsTable.COLUMN_OPTION1)));
question.setOption2(c.getString(c.getColumnIndex(QuestionsTable.COLUMN_OPTION2)));
question.setOption3(c.getString(c.getColumnIndex(QuestionsTable.COLUMN_OPTION3)));
question.setAnswerNr(c.getInt(c.getColumnIndex(QuestionsTable.COLUMN_ANSWER_NR)));
questionList.add(question);
} while (c.moveToNext());
}
c.close();
return questionList;
}
}
package com.codinginflow.myawesomequiz;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class StartingScreenActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_starting_screen);
Button buttonStartQuiz = findViewById(R.id.button_start_quiz);
buttonStartQuiz.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startQuiz();
}
});
}
private void startQuiz() {
Intent intent = new Intent(StartingScreenActivity.this, QuizActivity.class);
startActivity(intent);
}
}
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