QuestionActivity.java

package com.example.quizapp;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.collection.ArrayMap;
import android.animation.Animator;
import android.app.Dialog;
import android.content.Intent;


import android.content.res.ColorStateList;
import android.graphics.Color;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.DecelerateInterpolator;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.QueryDocumentSnapshot;
import com.google.firebase.firestore.QuerySnapshot;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import static com.example.quizapp.SetActivity.CAT_ID;
import static com.example.quizapp.SetActivity.setsIDs;
import static com.example.quizapp.SplashActivity.catList;
import static com.example.quizapp.SplashActivity.selected_cat_index;


public class QuestionActivity extends AppCompatActivity implements View.OnClickListener{
    private TextView question, qCount, timer;
    private Button option1, option2, option3, option4;
    private List<Question> questionList;
    private int quesNum;
    private CountDownTimer countDown;
    private int score;
    private FirebaseFirestore firestore;
    private int setNo;
    private Dialog loadingDialog;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_question);

        question = findViewById(R.id.question);
        qCount = findViewById(R.id.quest_num);
        timer = findViewById(R.id.countdown);

        option1 = findViewById(R.id.option1);
        option2 = findViewById(R.id.option2);
        option3 = findViewById(R.id.option3);
        option4 = findViewById(R.id.option4);

        option1.setOnClickListener(this);
        option2.setOnClickListener(this);
        option3.setOnClickListener(this);
        option4.setOnClickListener(this);

        loadingDialog = new Dialog(QuestionActivity.this);
        loadingDialog.setContentView(R.layout.loading_progressbar);
        loadingDialog.setCancelable(false);
        loadingDialog.getWindow().setBackgroundDrawableResource(R.drawable.progress_background);
        loadingDialog.getWindow().setLayout(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);
        loadingDialog.show();



        setNo = getIntent().getIntExtra("SETNO",1);
       firestore = FirebaseFirestore.getInstance();

        getQuestionsList();

        score = 0;



    }

    private void getQuestionsList()
    {
        questionList=new ArrayList<>();

        firestore.collection("Quiz").document("CAT"+String.valueOf(CAT_ID))
                .collection("SET"+String.valueOf(setNo)).get()
                .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {

                    public void onComplete(@NonNull Task<QuerySnapshot> task) {


                        if (task.isSuccessful()) {
                            QuerySnapshot questions=task.getResult();
                            Log.d("Loding",String.valueOf(questions.size()));
                            for (QueryDocumentSnapshot doc : questions) {


                                questionList.add(new Question(
                                        doc.getString("QUESTION"),
                                       doc.getString("A"),
                                        doc.getString("B"),
                                        doc.getString("C"),
                                        doc.getString("D"),
                                        Integer.valueOf(doc.getString("ANSWER"))
                                ));

                            }

                            setQuestion();



                        }

                        else{
                            Toast.makeText(QuestionActivity.this,task.getException().getMessage(),Toast.LENGTH_SHORT).show();
                        }
                        loadingDialog.cancel();
                    }
                });

    }

    private void setQuestion()
    {
        timer.setText(String.valueOf(10));


        for(int i=0; i <questionList.size(); i++) {

            question.setText(questionList.get(i).getQuestion());
            option1.setText(questionList.get(i).getOptionA());
            option2.setText(questionList.get(i).getOptionB());
            option3.setText(questionList.get(i).getOptionC());
            option4.setText(questionList.get(i).getOptionD());
        }


        qCount.setText(String.valueOf(1) + "/" + String.valueOf(questionList.size()));

        startTimer();

        quesNum = 0;

    }

    private void startTimer()
    {
        countDown = new CountDownTimer(12000, 1000) {
            @Override
            public void onTick(long millisUntilFinished) {
                if(millisUntilFinished < 10000)
                    timer.setText(String.valueOf(millisUntilFinished / 1000));
            }

            @Override
            public void onFinish()
            {
                changeQuestion();
            }
        };

        countDown.start();

    }






    @Override
    public void onClick(View v) {

        int selectedOption = 0;

        switch (v.getId())
        {
            case R.id.option1 :
                selectedOption = 1;
                break;

            case R.id.option2:
                selectedOption = 2;
                break;

            case R.id.option3:
                selectedOption = 3;
                break;

            case R.id.option4:
                selectedOption = 4;
                break;

            default:
        }

        countDown.cancel();
        checkAnswer(selectedOption, v);

    }

    private void checkAnswer(int selectedOption, View view)
    {

        if(selectedOption == questionList.get(quesNum).getCorrectAns())
        {
            //Right Answer
            ((Button)view).setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));

            score++;

        }
        else
        {
            //Wrong Answer
            ((Button)view).setBackgroundTintList(ColorStateList.valueOf(Color.RED));

            switch (questionList.get(quesNum).getCorrectAns())
            {
                case 1:
                    option1.setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
                    break;
                case 2:
                    option2.setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
                    break;
                case 3:
                    option3.setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
                    break;
                case 4:
                    option4.setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
                    break;

            }

        }


        Handler handler = new Handler();
        handler.postDelayed(new Runnable() {

            public void run() {
                changeQuestion();
            }
        }, 2000);



    }


    private void changeQuestion()
    {
        if( quesNum < questionList.size() - 1)
        {
            quesNum++;

            playAnim(question,0,0);
            playAnim(option1,0,1);
            playAnim(option2,0,2);
            playAnim(option3,0,3);
            playAnim(option4,0,4);

            qCount.setText(String.valueOf(quesNum+1) + "/" + String.valueOf(questionList.size()));

            timer.setText(String.valueOf(10));
            startTimer();

        }
        else
        {
            // Go to Score Activity
            Intent intent = new Intent(QuestionActivity.this,ScoreActivity.class);
            intent.putExtra("SCORE", String.valueOf(score) + "/" + String.valueOf(questionList.size()));
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
            startActivity(intent);
            QuestionActivity.this.finish();
        }


    }


    private void playAnim(final View view, final int value, final int viewNum)
    {

        view.animate().alpha(value).scaleX(value).scaleY(value).setDuration(500)
                .setStartDelay(100).setInterpolator(new DecelerateInterpolator())
                .setListener(new Animator.AnimatorListener() {
                    @Override
                    public void onAnimationStart(Animator animation) {

                    }

                    @Override
                    public void onAnimationEnd(Animator animation) {
                        if(value == 0)
                        {
                            switch (viewNum)
                            {
                                case 0:
                                    ((TextView)view).setText(questionList.get(quesNum).getQuestion());
                                    break;
                                case 1:
                                    ((Button)view).setText(questionList.get(quesNum).getOptionA());
                                    break;
                                case 2:
                                    ((Button)view).setText(questionList.get(quesNum).getOptionB());
                                    break;
                                case 3:
                                    ((Button)view).setText(questionList.get(quesNum).getOptionC());
                                    break;
                                case 4:
                                    ((Button)view).setText(questionList.get(quesNum).getOptionD());
                                    break;

                            }


                            if(viewNum != 0)
                                ((Button)view).setBackgroundTintList(ColorStateList.valueOf(Color.parseColor("#FFFFFF")));


                            playAnim(view,1,viewNum);

                        }

                    }

                    @Override
                    public void onAnimationCancel(Animator animation) {

                    }

                    @Override
                    public void onAnimationRepeat(Animator animation) {

                    }
                });

    }

    @Override
    public void onBackPressed() {
        super.onBackPressed();

        countDown.cancel();
    }


}