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How to convert string "1/4" into double without causing NumberFormatException in Android Studio?

I’m taking an EditText input from user like "1/3","1/4" etc. This input must be converted to Double.

This is what I’m trying to do with the code:

double shareDouble= Double.parseDouble(etShare.getText().toString());

But this throws a NumberFormatException. What I’m doing wrong. Please help..

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2

Answers


  1. 0

    Split the string

    val s = "1/4"
val splitString = s.split("/")
val top = splitString[0].toDouble()
val bottom = splitString[1].toDouble()
    
val number = top / bottom
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  2. 0

    Check below function

        private double convertFractionToDouble(String fraction) throws Exception {
        String[] parts = fraction.split("/");
        if (parts.length != 2) {
            throw new Exception("Invalid fraction format");
        }
        int numerator = Integer.parseInt(parts[0]);
        int denominator = Integer.parseInt(parts[1]);
        return (double) numerator / denominator;
    }

    You have to split string to index 0 and index 1.

    And call it in your code like :

            EditText editTextFraction = findViewById(R.id.editTextFraction);
        Button buttonConvert = findViewById(R.id.buttonConvert);
        TextView textViewResult = findViewById(R.id.textViewResult);

        buttonConvert.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String fraction = editTextFraction.getText().toString().trim();

                if (fraction.isEmpty()) {
                    Toast.makeText(MainActivity.this, "Please enter a fraction", Toast.LENGTH_SHORT).show();
                    return;
                }

                try {
                    double result = convertFractionToDouble(fraction);
                    textViewResult.setText(String.valueOf(result));
                } catch (Exception e) {
                    Toast.makeText(MainActivity.this, "Invalid fraction format", Toast.LENGTH_SHORT).show();
                }
            }
        });
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