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app/src/main/java/bomanthis/mathe/LevelFiveQuestion.java

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+//Creats a level 5 question. Trig
+
+/*public class LevelFiveQuestion extends Questions{
+	
+	private String[] x = new String[]{"0", (String)227};
+	private String[][] y;
+	private String answer;
+	private String question;
+	
+	//constructors
+	
+	public LevelFiveQuestion(){
+		
+	}
+	
+	//accessor methods
+	
+	public String getQuestion(){
+		return (question + ". Simplify.");
+	}
+	
+	public String getRightAnswer(){
+		return answer;
+	}
+	
+	public String getWrongAnswer(){
+		
+	}
+	
+}*/

app/src/main/java/bomanthis/mathe/LevelFourQuestion.java

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+//Creats a level 4 question Algebra 1
+
+public class LevelFourQuestion extends Questions{
+
+	private int x;
+	private int y;
+	private String answer;
+	private String question;
+
+	//constructors
+
+	public LevelFourQuestion(){
+		x = (int)(Math.random()*20);
+		y = (int)(Math.pow((double)(x / 2), 2.0));
+		question = ("x^2 + " + x + "x + " + y);
+		if(x % 2 == 0)
+			answer = ("(x + " + (x / 2) + ")^2");
+		else
+			answer = ("(x + " + (x / 2) + ")(x + " + (x / 2 + 1) + ")");
+	}
+
+	//accessor methods
+
+	public String getQuestion(){
+		return (question + ". Simplify.");
+	}
+
+	public String getRightAnswer(){
+		return answer;
+	}
+
+	public String getWrongAnswer(){
+		int a = (int)(Math.random()*15);
+		if(x % 2 == 0)
+			return ("(x + " + a + ")^2");
+		else
+			return ("(x + " + a + ")(x + " + (a + 1) + ")");
+	}
+
+}

app/src/main/java/bomanthis/mathe/LevelOneQuestion.java

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+//Creats a level 1 question Addition/Subtraction
+
+public class LevelOneQuestion extends Questions{
+
+	private int x;
+	private int y;
+	private int answer;
+	private String n;
+
+	//constructors
+
+	public LevelOneQuestion(){
+		x = (int)(Math.random()*100);
+		y = (int)(Math.random()*100);
+		if(y % 2 == 0){
+			n = " - ";
+			answer = x - y;
+		} else {
+			n = " + ";
+			answer = x + y;
+		}
+	}
+
+	//accessor methods
+
+	public String getQuestion(){
+		return (x + n + y + " = ");
+	}
+
+	public String getRightAnswer(){
+		return ("" + answer);
+	}
+
+	public String getWrongAnswer(){
+		return ("" + (int)(Math.random()*150));
+	}
+
+}

app/src/main/java/bomanthis/mathe/LevelThreeQuestion.java

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+//Creats a level 3 question Simple Algebra
+
+public class LevelThreeQuestion extends Questions{ 
+
+	private int x;
+	private int y;
+	private int answer;
+	private String question;
+
+	//constructors
+
+	public LevelThreeQuestion(){
+		x = (int)(Math.random()*20);
+		y = (int)(Math.random()*20);
+		if((y - x) % 2 == 0){
+			answer = (y - x)/2;
+			question = ("2x + " + x + " = " + y);
+		} else if(x % 2 == 0){
+			answer = (y - x);
+			question = ("x + " + x + " = " + y);
+		} else if(y % 2 == 0){
+			answer = (y - x);
+			question = (x + " + x = " + y);
+		} else {
+			answer = -1 * (y-x);
+			question = (x + " - x = " + y);
+		}
+	}
+
+	//accessor methods
+
+	public String getQuestion(){
+		return (question + ". Find x.");
+	}
+
+	public String getRightAnswer(){
+		return ("" + answer);
+	}
+
+	public String getWrongAnswer(){
+		return ("" + (int)(Math.random()*30));
+	}
+
+}

app/src/main/java/bomanthis/mathe/LevelTwoQuestion.java

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+//Creats a level 2 question Multiplication/Division
+
+public class LevelTwoQuestion extends Questions{ 
+
+	private int x;
+	private int y;
+	private String answer;
+	private String n;
+	private int rem;
+
+	//constructors
+
+	public LevelTwoQuestion(){
+		x = (int)(Math.random()*20);
+		y = (int)(Math.random()*20);
+		if(y % 2 == 0){
+			n = " * ";
+			answer = ("" + (x * y));
+		} else {
+			n = " / ";
+			rem = x % y;
+			answer = ("" + (x / y) + " R: " + rem);
+		}
+	}
+
+	//accessor methods
+
+	public String getQuestion(){
+		return (x + n + y + " = ");
+	}
+
+	public String getRightAnswer(){
+		return answer;
+	}
+
+	public String getWrongAnswer(){
+		if(y % 2 == 0){
+			return("" + (int)(Math.random()*20)*(int)(Math.random()*20));
+		} else {
+			return("" + (x / y) + " R: " + ((int)(Math.random()*y)));
+		}
+	}
+
+}

app/src/main/java/bomanthis/mathe/Problem.java

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+//Problem Class. A class with a question and an answer.
+
+public class Problem{
+
+	private String question;
+	private String[] answers;
+	private int level;
+	private int index = 0;
+
+	//Constructors
+
+	public Problem(){
+		question = "";
+		answers = new String[5];
+		level = 1;
+		createQuestion();
+	}
+
+	public Problem(int l){
+		question = "";
+		answers = new String[5];
+		level = l;
+		createQuestion();
+	}
+
+	public Problem(String q, String[] a, int l){
+		question = q;
+		answers = new String[5];
+		for(int i = 0; i < 5; i++){
+			answers[i] = a[i];
+		}
+		level = l;
+	}
+
+	//Methods
+
+	public void createQuestion(){
+		Questions q;
+		switch (level) {
+			case 2: q = new LevelTwoQuestion();
+				break;
+			case 3: q = new LevelThreeQuestion();
+				break;
+			case 4: q = new LevelFourQuestion();
+				break;
+			//case 5: q = new LevelFiveQuestion();
+				//break;
+			default: q = new LevelOneQuestion();
+				break;
+		}
+		question = q.getQuestion();
+		index = (int)(Math.random()*5);
+		for(int i = 0; i < 5; i++){
+			if(i == index)
+				answers[i] = q.getRightAnswer();
+			else
+				answers[i] = q.getWrongAnswer();
+		}
+	}
+
+	//Modifying Methods
+
+	public void setQuestion(String q){
+		question = q;
+	}
+
+	public void setAnswers(String[] a){
+		for(int i = 0; i < 5; i++){
+			answers[i] = a[i];
+		}
+	}
+
+	public void setLevel(int l){
+		level = l;
+		Questions q;
+		switch (level) {
+			case 2: q = new LevelTwoQuestion();
+				break;
+			case 3: q = new LevelThreeQuestion();
+				break;
+			case 4: q = new LevelFourQuestion();
+				break;
+			//case 5: q = new LevelFiveQuestion();
+				//break;
+			default: q = new LevelOneQuestion();
+				break;
+		}
+		question = q.getQuestion();
+		index = (int)(Math.random()*5);
+		for(int i = 0; i < 5; i++){
+			if(i == index)
+				answers[i] = q.getRightAnswer();
+			else
+				answers[i] = q.getWrongAnswer();
+		}
+	}
+
+	//Accessor Methods
+
+	public String getQuestion(){ return question; }
+
+	public String[] getAnswers(){ return answers; }
+
+	public int getLevel(){ return level; }
+
+	public int getRightAnswerIndex(){ return index; }
+
+}

app/src/main/java/bomanthis/mathe/Questions.java

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+//abstract class Questions
+
+public abstract class Questions{
+	public Questions(){}
+	public abstract String getQuestion();
+	public abstract String getRightAnswer();
+	public abstract String getWrongAnswer();
+}