Kids Math app

package com.apdim3.learningforkidsunlimited;

import android.content.ClipData;
import android.content.ClipDescription;
import android.os.Bundle;
import android.util.Log;
import android.view.DragEvent;
import android.view.View;
import android.widget.GridLayout;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.util.Random;

public class CalculationActivity extends AppCompatActivity {

    private GridLayout gridLayout1, gridLayout2;
    private TextView question, answers;
    private int num1,num2;

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

        gridLayout1 = findViewById(R.id.gridLayout1);
        gridLayout2 = findViewById(R.id.gridLayout2);
        question = findViewById(R.id.question);
        answers = findViewById(R.id.answers);

        populateGridLayouts();

        // Generate the first question
        generateQuestion();

        
    }

    void generateQuestion() {
        num1 = (int) gridLayout1.getChildAt(new Random().nextInt(gridLayout1.getChildCount())).getTag();
        num2 = (int) gridLayout2.getChildAt(new Random().nextInt(gridLayout2.getChildCount())).getTag();

        question.setText(num1 + " + " + num2 + " = ");

        int correctAnswer = num1 + num2;
        setOptions(correctAnswer);

        // Debug: Log the correct answer
        Log.d("CalculationActivity", "Correct Answer: " + correctAnswer);
    }

    void setOptions(int correctAnswer) {
        Random random = new Random();
        int[] options = new int[4];
        int correctPosition = random.nextInt(4);

        for (int i = 0; i < 4; i++) {
            if (i == correctPosition) {
                options[i] = correctAnswer;
            } else {
                int wrongAnswer;
                do {
                    wrongAnswer = random.nextInt(20); // Adjust range as needed
                } while (wrongAnswer == correctAnswer);
                options[i] = wrongAnswer;
            }
        }

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

        option1.setText(String.valueOf(options[0]));
        option2.setText(String.valueOf(options[1]));
        option3.setText(String.valueOf(options[2]));
        option4.setText(String.valueOf(options[3]));

        setupDragAndDrop(option1, correctAnswer);
        setupDragAndDrop(option2, correctAnswer);
        setupDragAndDrop(option3, correctAnswer);
        setupDragAndDrop(option4, correctAnswer);
    }

    void setupDragAndDrop(TextView option, int correctAnswer) {
        option.setOnLongClickListener(view -> {
            ClipData.Item item = new ClipData.Item(option.getText());
            ClipData dragData = new ClipData(
                    option.getText(),
                    new String[]{ClipDescription.MIMETYPE_TEXT_PLAIN},
                    item
            );

            View.DragShadowBuilder myShadow = new View.DragShadowBuilder(option);
            view.startDragAndDrop(dragData, myShadow, null, 0);
            return true;
        });

        answers.setOnDragListener((view, dragEvent) -> {
            switch (dragEvent.getAction()) {
                case DragEvent.ACTION_DRAG_STARTED:
                    return dragEvent.getClipDescription().hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN);

                case DragEvent.ACTION_DRAG_ENTERED:
                    view.setBackgroundColor(0x30000000); // Optional: highlight when dragging over
                    return true;

                case DragEvent.ACTION_DRAG_EXITED:
                    view.setBackgroundColor(0x00000000); // Optional: remove highlight when exiting
                    return true;

                case DragEvent.ACTION_DROP:
                    ClipData.Item item = dragEvent.getClipData().getItemAt(0);
                    String dragData = item.getText().toString();

                    TextView answerTextView = (TextView) view;
                    answerTextView.setText(dragData);

                    int droppedAnswer = Integer.parseInt(dragData);
                    if (droppedAnswer == correctAnswer) {
                        generateQuestion(); // Generate next question if correct
                    }
                    return true;

                case DragEvent.ACTION_DRAG_ENDED:
                    view.setBackgroundColor(0x00000000); // Optional: remove highlight when drag ends
                    return true;

                default:
                    return false;
            }
        });
    }

    void populateGridLayouts() {
        for (int i = 0; i < num1; i++) {
            ImageView imageView = new ImageView(this);
            imageView.setImageResource(R.drawable.circle); // Replace with actual image resource
            imageView.setTag(i + 1); // Assign a value to each image

            GridLayout.LayoutParams layoutParams = new GridLayout.LayoutParams();
            layoutParams.width = 50; // width in pixels
            layoutParams.height = 50; // height in pixels
            layoutParams.setMargins(3, 3, 3, 3); // margins in pixels
            imageView.setLayoutParams(layoutParams);

            gridLayout1.addView(imageView);
        }

        for (int i = 0; i < num2; i++) {
            ImageView imageView = new ImageView(this);
            imageView.setImageResource(R.drawable.star); // Replace with actual image resource
            imageView.setTag(i + 1); // Assign a value to each image
            GridLayout.LayoutParams layoutParams = new GridLayout.LayoutParams();
            layoutParams.width = 50; // width in pixels
            layoutParams.height = 50; // height in pixels
            layoutParams.setMargins(3, 3, 3, 3); // margins in pixels
            imageView.setLayoutParams(layoutParams);
            gridLayout2.addView(imageView);
        }
    }

}