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I am new in Android and I would like to create simple Math quiz. I have a one textview that I display random question with random operator as below code.I would like, user will input their answer to EditText and submit their answer with ImageButton that I called submit answer. My question is, I could not handle to check user answer on Edittext via different method.How can I check user answer that evaluate the answer after submitbutton ?

public class MainActivity extends AppCompatActivity

int number1, number2, result;
public EditText answer;
char operator;
ImageButton submitAnswer;
Random rand = new Random();


@Override
protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);


 Random rnd = new Random();
 number1 = rnd.nextInt(100) + 1;
 number2 = rnd.nextInt(100) + 1;
 generateOperator();
 TextView question = findViewById(R.id.questionText);
 question.setText(number1 + " " + operator + " " + number2 + " " + "=" + " " + "?");




public int generateOperator() 
 int op = rand.nextInt(3) + 1;
 if (op == 1) 
 operator = '+';
 result = number1+number2;
 else if (op == 2) 
 operator = '-';
 result= number1-number2;
 else if (op == 3) 
 operator = '*';
 result = number1+number2;
 
 return operator;



public void submitAnswer(View view) 

 submitAnswer = findViewById(R.id.submitButton);
 submitAnswer.setOnClickListener(new View.OnClickListener() 
 @Override
 public void onClick(View view) 
 if ( result == Integer.valueOf(answer.getText().toString()))

 Toast.makeText(view.getContext(), "Correct",
 Toast.LENGTH_SHORT).show();

 
 else
 
 Toast.makeText(view.getContext(), "Wrong",
 Toast.LENGTH_SHORT).show();

 

 
 );

First of all, edir your generateOperator() method to keep answer.

public int generateOperator() 
 int op = rand.nextInt(3) + 1;
 if (op == 1) 
 operator = '+';
 result = number1 + number2;
 else if (op == 2) 
 operator = '-';
 result = number1 - number2;
 else if (op == 3) 
 operator = '*';
 result = number1 * number2;
 
 return operator;

And then you can simply compare your result and the user's answer.

submitAnswer.setOnClickListener(new View.OnClickListener() 
 @Override
 public void onClick(View view) 
 if(result == Integer.valueOf(answer.getText().toString()))
 //Answer is ok.
 
 else 
 //Some code...
 
 
 );