android - Format Currency Input editText

Android - Format Currency Input editText

To format currency input in an EditText in Android, you can use a TextWatcher to automatically format the text as the user types. Here's how to implement this:

Step 1: Create Your Layout

Create an XML layout file (e.g., activity_main.xml) that includes an EditText for currency input:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="16dp"> <EditText android:id="@+id/editTextCurrency" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="Enter amount" android:inputType="numberDecimal" /> </LinearLayout>

Step 2: Implement Currency Formatting in Your Activity

In your Activity (e.g., MainActivity.java), set up a TextWatcher to format the currency:

import android.os.Bundle; import android.text.Editable; import android.text.TextWatcher; import android.widget.EditText; import androidx.appcompat.app.AppCompatActivity; import java.text.NumberFormat; import java.text.ParseException; import java.util.Locale; public class MainActivity extends AppCompatActivity { private EditText editTextCurrency; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); editTextCurrency = findViewById(R.id.editTextCurrency); editTextCurrency.addTextChangedListener(new TextWatcher() { private String current = ""; @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { // No action needed } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { if (!s.toString().equals(current)) { String cleanString = s.toString().replaceAll("[^\\d]", ""); if (!cleanString.isEmpty()) { double parsed = Double.parseDouble(cleanString); String formatted = NumberFormat.getCurrencyInstance(Locale.getDefault()).format(parsed / 100); current = formatted; editTextCurrency.setText(formatted); editTextCurrency.setSelection(formatted.length()); } else { current = ""; editTextCurrency.setText(""); } } } @Override public void afterTextChanged(Editable s) { // No action needed } }); } }

Explanation

  1. TextWatcher: We implement TextWatcher to listen for text changes in the EditText.
  2. Input Handling: We clean the input to remove non-numeric characters and format it as currency.
  3. Currency Formatting: We use NumberFormat.getCurrencyInstance() to format the number as currency and update the EditText.
  4. Maintaining Cursor Position: We set the cursor position to the end of the formatted string after updating the text.

Summary

  • Use TextWatcher to listen for changes in the EditText.
  • Format the input as currency while ensuring only numeric input is processed.
  • Update the EditText with the formatted string, maintaining the cursor position.

This will help you create a user-friendly currency input field in your Android app.

Examples

  1. How to format currency input in an EditText field in Android?

    • Description: Implement a text watcher to format currency input as the user types.
    • Code:
      editText.addTextChangedListener(new TextWatcher() { DecimalFormat df = new DecimalFormat("#,###.##"); private String current = ""; @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {} @Override public void onTextChanged(CharSequence s, int start, int before, int count) {} @Override public void afterTextChanged(Editable s) { if (!s.toString().equals(current)) { editText.removeTextChangedListener(this); String cleanString = s.toString().replaceAll("[$,.]", ""); double parsed; try { parsed = Double.parseDouble(cleanString); } catch (NumberFormatException e) { parsed = 0.00; } String formatted = df.format(parsed); current = formatted; editText.setText(formatted); editText.setSelection(formatted.length()); editText.addTextChangedListener(this); } } });

  2. How to restrict input to numeric and decimal values in an EditText for currency input?

    • Description: Allow only numeric and decimal values in the EditText to ensure valid currency input.
    • Code:
      editText.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL); // Optionally, limit the number of decimal places editText.setFilters(new InputFilter[] { new InputFilter.LengthFilter(MAX_LENGTH), new InputFilter() { @Override public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) { if (source.toString().matches("[0-9]{1,}+((\\.[0-9]{0," + DECIMAL_PLACES + "})?)")) { return null; } return ""; } } });

  3. How to handle currency formatting based on locale settings in Android EditText?

    • Description: Format currency input according to the user's locale preferences, such as using commas and period for thousands and decimals.
    • Code:
      DecimalFormatSymbols symbols = DecimalFormatSymbols.getInstance(Locale.getDefault()); final String currencySymbol = symbols.getCurrencySymbol(); final String groupSeparator = String.valueOf(symbols.getGroupingSeparator()); final String decimalSeparator = String.valueOf(symbols.getDecimalSeparator()); editText.addTextChangedListener(new TextWatcher() { private DecimalFormat df = new DecimalFormat("#,###.##", symbols); private String current = ""; @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {} @Override public void onTextChanged(CharSequence s, int start, int before, int count) {} @Override public void afterTextChanged(Editable s) { if (!s.toString().equals(current)) { editText.removeTextChangedListener(this); String cleanString = s.toString() .replaceAll("[" + currencySymbol + groupSeparator + "]", "") .replaceAll("\\" + decimalSeparator, "."); double parsed; try { parsed = Double.parseDouble(cleanString); } catch (NumberFormatException e) { parsed = 0.00; } String formatted = currencySymbol + df.format(parsed); current = formatted; editText.setText(formatted); editText.setSelection(formatted.length()); editText.addTextChangedListener(this); } } });

  4. How to automatically format currency input with commas in EditText in Android?

    • Description: Automatically add commas for thousands separator as the user types currency values.
    • Code:
      editText.addTextChangedListener(new TextWatcher() { DecimalFormat df = new DecimalFormat("#,###.##"); private String current = ""; @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {} @Override public void onTextChanged(CharSequence s, int start, int before, int count) {} @Override public void afterTextChanged(Editable s) { if (!s.toString().equals(current)) { editText.removeTextChangedListener(this); String cleanString = s.toString().replaceAll("[$,.]", ""); double parsed; try { parsed = Double.parseDouble(cleanString); } catch (NumberFormatException e) { parsed = 0.00; } String formatted = df.format(parsed); current = formatted; editText.setText(formatted); editText.setSelection(formatted.length()); editText.addTextChangedListener(this); } } });

  5. How to set a default currency format (e.g., $) in an EditText for Android?

    • Description: Prepend a currency symbol to the EditText and allow numeric input after it.
    • Code:
      editText.setText("$ "); editText.setSelection(editText.getText().length()); editText.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL); editText.setOnFocusChangeListener(new View.OnFocusChangeListener() { @Override public void onFocusChange(View v, boolean hasFocus) { if (hasFocus && editText.getText().toString().trim().equals("$")) { editText.setText("$ "); editText.setSelection(editText.getText().length()); } } });

  6. How to handle currency formatting while maintaining decimal precision in Android EditText?

    • Description: Format currency input with specified decimal places and handle user input accordingly.
    • Code:
      editText.addTextChangedListener(new TextWatcher() { DecimalFormat df = new DecimalFormat("#,###.##"); private String current = ""; @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {} @Override public void onTextChanged(CharSequence s, int start, int before, int count) {} @Override public void afterTextChanged(Editable s) { if (!s.toString().equals(current)) { editText.removeTextChangedListener(this); String cleanString = s.toString().replaceAll("[$,.]", ""); double parsed; try { parsed = Double.parseDouble(cleanString); } catch (NumberFormatException e) { parsed = 0.00; } String formatted = df.format(parsed); current = formatted; editText.setText(formatted); editText.setSelection(formatted.length()); editText.addTextChangedListener(this); } } });

  7. How to handle formatting for international currencies in EditText on Android?

    • Description: Support different international currencies with appropriate formatting and symbols.
    • Code:
      // Use appropriate DecimalFormatSymbols and adjust format according to locale DecimalFormatSymbols symbols = new DecimalFormatSymbols(Locale.getDefault()); final String currencySymbol = symbols.getCurrencySymbol(); editText.addTextChangedListener(new TextWatcher() { private DecimalFormat df = new DecimalFormat("#,###.##", symbols); private String current = ""; @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {} @Override public void onTextChanged(CharSequence s, int start, int before, int count) {} @Override public void afterTextChanged(Editable s) { if (!s.toString().equals(current)) { editText.removeTextChangedListener(this); String cleanString = s.toString().replaceAll("[" + currencySymbol + ",]", ""); double parsed; try { parsed = Double.parseDouble(cleanString); } catch (NumberFormatException e) { parsed = 0.00; } String formatted = currencySymbol + df.format(parsed); current = formatted; editText.setText(formatted); editText.setSelection(formatted.length()); editText.addTextChangedListener(this); } } });

  8. How to handle currency input with a fixed number of decimal places in EditText?

    • Description: Ensure currency input always respects a fixed number of decimal places for accuracy.
    • Code:
      editText.addTextChangedListener(new TextWatcher() { DecimalFormat df = new DecimalFormat("#,###.00"); private String current = ""; @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {} @Override public void onTextChanged(CharSequence s, int start, int before, int count) {} @Override public void afterTextChanged(Editable s) { if (!s.toString().equals(current)) { editText.removeTextChangedListener(this); String cleanString = s.toString().replaceAll("[$,.]", ""); double parsed; try { parsed = Double.parseDouble(cleanString); } catch (NumberFormatException e) { parsed = 0.00; } String formatted = df.format(parsed); current = formatted; editText.setText(formatted); editText.setSelection(formatted.length()); editText.addTextChangedListener(this); } } });

  9. How to handle currency formatting with locale-specific symbols in EditText on Android?

    • Description: Format currency input according to the device's locale, including symbols for grouping and decimal points.
    • Code:
      DecimalFormatSymbols symbols = new DecimalFormatSymbols(Locale.getDefault()); final String currencySymbol = symbols.getCurrencySymbol(); final String groupSeparator = String.valueOf(symbols.getGroupingSeparator()); final String decimalSeparator = String.valueOf(symbols.getDecimalSeparator()); editText.addTextChangedListener(new TextWatcher() { private DecimalFormat df = new DecimalFormat("#,###.##", symbols); private String current = ""; @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {} @Override public void onTextChanged(CharSequence s, int start, int before, int count) {} @Override public void afterTextChanged(Editable s) { if (!s.toString().equals(current)) { editText.removeTextChangedListener(this); String cleanString = s.toString() .replaceAll("[" + currencySymbol + groupSeparator + "]", "") .replaceAll("\\" + decimalSeparator, "."); double parsed; try { parsed = Double.parseDouble(cleanString); } catch (NumberFormatException e) { parsed = 0.00; } String formatted = currencySymbol + df.format(parsed); current = formatted; editText.setText(formatted); editText.setSelection(formatted.length()); editText.addTextChangedListener(this); } } });

  10. How to handle currency input with live formatting updates in EditText on Android?

    • Description: Format currency input dynamically as the user types, updating the EditText with correct formatting.
    • Code:
      editText.addTextChangedListener(new TextWatcher() { private DecimalFormat df = new DecimalFormat("#,###.##"); private String current = ""; @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {} @Override public void onTextChanged(CharSequence s, int start, int before, int count) {} @Override public void afterTextChanged(Editable s) { if (!s.toString().equals(current)) { editText.removeTextChangedListener(this); String cleanString = s.toString().replaceAll("[$,.]", ""); double parsed; try { parsed = Double.parseDouble(cleanString); } catch (NumberFormatException e) { parsed = 0.00; } String formatted = df.format(parsed); current = formatted; editText.setText(formatted); editText.setSelection(formatted.length()); editText.addTextChangedListener(this); } } });

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