如何在android中使用单选按钮进行数学运算

// MainActivity.java

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private RadioGroup radioGroup;
    private EditText operand1EditText;
    private EditText operand2EditText;
    private Button calculateButton;

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

        radioGroup = findViewById(R.id.radioGroup);
        operand1EditText = findViewById(R.id.operand1EditText);
        operand2EditText = findViewById(R.id.operand2EditText);
        calculateButton = findViewById(R.id.calculateButton);

        calculateButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int selectedId = radioGroup.getCheckedRadioButtonId();
                double operand1 = Double.parseDouble(operand1EditText.getText().toString());
                double operand2 = Double.parseDouble(operand2EditText.getText().toString());

                double result = 0;

                switch (selectedId) {
                    case R.id.addRadioButton:
                        result = operand1 + operand2;
                        break;
                    case R.id.subtractRadioButton:
                        result = operand1 - operand2;
                        break;
                    case R.id.multiplyRadioButton:
                        result = operand1 * operand2;
                        break;
                    case R.id.divideRadioButton:
                        if (operand2 != 0) {
                            result = operand1 / operand2;
                        } else {
                            Toast.makeText(MainActivity.this, "Cannot divide by zero", Toast.LENGTH_SHORT).show();
                            return;
                        }
                        break;
                }

                Toast.makeText(MainActivity.this, "Result: " + result, Toast.LENGTH_SHORT).show();
            }
        });
    }
}