For My Java Quiz App

Shark App Java

package android.example.sharkquiz;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private int score = 0;
    private RadioGroup questionOneTf;
    private CheckBox checkBox1;
    private CheckBox checkBox2;
    private CheckBox checkBox3;
    private RadioGroup questionThreeTf;
    private EditText sharkAnswer;

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


        //When True or False is Selected for question 1
        questionOneTf = (RadioGroup) findViewById(R.id.question_one_true_false_radio_group);
        questionOneTf.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                if(checkedId== R.id.question_one_true)
                    score++;
                else
                    score--;
            }
        });
          boolean questionOneTrue = ((RadioButton) findViewById(R.id.question_one_true)).isChecked();


        //When Answers are checked for question 2
        checkBox1 = (CheckBox) findViewById(R.id.question_two_box_1);
        checkBox1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked)
                    score++;
                else
                    score--;
            }
        });
         // boolean sharksHearing = checkBox1.isChecked();

        checkBox2 = (CheckBox) findViewById(R.id.question_two_box_2);
        checkBox2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked)
                    score++;
                else
                    score--;
            }
        });

        checkBox3 = (CheckBox) findViewById(R.id.question_two_box_3);
        checkBox3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked)
                    score++;
                else
                    score--;
            }
        });

        //When true or false is selected for Question 3
        questionThreeTf = (RadioGroup) findViewById(R.id.question_three_true_false_radio_group);
        questionThreeTf.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                if(checkedId== R.id.question_three_true)
                    score++;
                else
                    score--;
            }
        });

        sharkAnswer = (EditText) findViewById(R.id.largest_shark);
    }

    //This method is called when the Submit Quiz button is selected

    public void submitQuiz(View view) {
        if(sharkAnswer.getText().toString().equals("Whale Shark"))
            score++;

        Toast.makeText(this, "SCORE "+score, Toast.LENGTH_LONG).show();

        clear();

    }

    private void clear(){
        checkBox1.setChecked(false);
        checkBox2.setChecked(false);
        checkBox3.setChecked(false);
        questionOneTf.clearCheck();
        questionThreeTf.clearCheck();
        sharkAnswer.setText(null);
        score=0;
    }

}