Format personnalisé modifier la saisie de texte android pour accepter le numéro de carte de crédit

ça marche:

public class EditTextSample extends Activity {
    // This regexp has to be improved, it does not detect case where you have
    // more than 4 digits in a middle group like: 1234-12345-123
    static final Pattern CODE_PATTERN = Pattern.compile("([0-9]{0,4})|([0-9]{4}-)+|([0-9]{4}-[0-9]{0,4})+");

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.edit_text_sample);

        final EditText editText = (EditText) findViewById(R.id.input);
        editText.addTextChangedListener(new TextWatcher() {

            @Override
            public void afterTextChanged(Editable s) {
                Log.w("", "input" + s.toString());

                if (s.length() > 0 && !CODE_PATTERN.matcher(s).matches()) {
                    String input = s.toString();
                    String numbersOnly = keepNumbersOnly(input);
                    String code = formatNumbersAsCode(numbersOnly);

                    Log.w("", "numbersOnly" + numbersOnly);
                    Log.w("", "code" + code);

                    editText.removeTextChangedListener(this);
                    editText.setText(code);
                    // You could also remember the previous position of the cursor
                    editText.setSelection(code.length());
                    editText.addTextChangedListener(this);
                }
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
            }

            private String keepNumbersOnly(CharSequence s) {
                return s.toString().replaceAll("[^0-9]", ""); // Should of course be more robust
            }

            private String formatNumbersAsCode(CharSequence s) {
                int groupDigits = 0;
                String tmp = "";
                for (int i = 0; i < s.length(); ++i) {
                    tmp += s.charAt(i);
                    ++groupDigits;
                    if (groupDigits == 4) {
                        tmp += "-";
                        groupDigits = 0;
                    }
                }
                return tmp;
            }
        });
    }
}

dans mon cas, le code ci-dessous fonctionne très bien.

editTextCreditCard.addTextChangedListener(new FourDigitCardFormatWatcher());

ajouter la classe personnalisée pour TextWatcher .

public class FourDigitCardFormatWatcher implements TextWatcher {

        private static final char space = ' ';

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void afterTextChanged(Editable s) {
            if (s.length() > 0 && (s.length() % 5) == 0) {
                final char c = s.charAt(s.length() - 1);
                if (space == c) {
                    s.delete(s.length() - 1, s.length());
                }
            }
            if (s.length() > 0 && (s.length() % 5) == 0) {
                char c = s.charAt(s.length() - 1);
                if (Character.isDigit(c) && TextUtils.split(s.toString(), String.valueOf(space)).length <= 3) {
                    s.insert(s.length() - 1, String.valueOf(space));
                }
            }
        }
    }

J'espère que cela vous aidera.

Il me semble que les réponses présentées ici ne fonctionne pas correctement avec les supprimer, supprimer à partir du milieu des opérations, etc. Voici mon code. Il ne restreint pas la longueur de l'entrée, mais semble être ok avec diverses insertions et suppressions:

import android.text.Editable;
import android.text.TextWatcher;
import android.view.KeyEvent;
import android.view.View;
import android.widget.EditText;

public class HyphenDelimitTextWatcher implements TextWatcher {
    EditText mEditText;
    boolean mInside = false;
    boolean mWannaDeleteHyphen = false;
    boolean mKeyListenerSet = false;
    final static String MARKER = "|"; // filtered in layout not to be in the string

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        if(!mKeyListenerSet) {
            mEditText.setOnKeyListener(new View.OnKeyListener() {
                @Override
                public boolean onKey(View v, int keyCode, KeyEvent event) {
                    try {
                        mWannaDeleteHyphen = (keyCode == KeyEvent.KEYCODE_DEL
                                && mEditText.getSelectionEnd() - mEditText.getSelectionStart() <= 1
                                && mEditText.getSelectionStart() > 0
                                && mEditText.getText().toString().charAt(mEditText.getSelectionEnd() - 1) == '-');
                    } catch (IndexOutOfBoundsException e) {
                        // never to happen because of checks
                    }
                    return false;
                }
            });
            mKeyListenerSet = true;
        }
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        if (mInside) // to avoid recursive calls
            return;
        mInside = true;

        int currentPos = mEditText.getSelectionStart();
        String string = mEditText.getText().toString().toUpperCase();
        String newString = makePrettyString(string);

        mEditText.setText(newString);
        try {
            mEditText.setSelection(getCursorPos(string, newString, currentPos, mWannaDeleteHyphen));
        } catch (IndexOutOfBoundsException e) {
            mEditText.setSelection(mEditText.length()); // last resort never to happen
        }

        mWannaDeleteHyphen = false;
        mInside = false;
    }

    @Override
    public void afterTextChanged(Editable s) {
    }

    private String makePrettyString(String string) {
        String number = string.replaceAll("-", "");
        boolean isEndHyphen = string.endsWith("-") && (number.length()%4 == 0);
        return number.replaceAll("(.{4}(?!$))", "-") + (isEndHyphen ?"-":"");
    }

    private int getCursorPos(String oldString, String newString, int oldPos, boolean isDeleteHyphen) {
        int cursorPos = newString.length();
        if(oldPos != oldString.length()) {
            String stringWithMarker = oldString.substring(0, oldPos) + MARKER + oldString.substring(oldPos);

            cursorPos = (makePrettyString(stringWithMarker)).indexOf(MARKER);
            if(isDeleteHyphen)
                cursorPos -= 1;
        }
        return cursorPos;
    }

    public HyphenDelimitTextWatcher(EditText editText) {
        mEditText = editText;
    }
}

Utilisation:

    mSomeEditText.addTextChangedListener(new HyphenDelimitTextWatcher(mSomeEditText));

si vous avez eu besoin de cet efect, vous pouvez utiliser ce code en texte électronique

cela fonctionne dans tous les cas, lorsque vous insérez ou supprimez un caractère, le format sera toujours correct. Assurez-vous de mettre

android:inputType="number"

/

myEditText.addTextChangedListener(new TextWatcher() {
        private final String space = "-"; // you can change this to whatever you want
        private final Pattern pattern = Pattern.compile("^(\d{4}"+space+"{1}){0,3}\d{1,4}$"); // check whether we need to modify or not
        @Override
        public void onTextChanged(CharSequence s, int st, int be, int count) {
            String currentText = myEditText.getText().toString();
            if (currentText.isEmpty() || pattern.matcher(currentText).matches())
                return; // no need to modify
            String numbersOnly = currentText.trim().replaceAll("[^\d.]", "");; // remove everything but numbers
            String formatted = "";
            for(int i = 0; i < numbersOnly.length(); i += 4)
                if (i + 4 < numbersOnly.length())
                    formatted += numbersOnly.substring(i,i+4)+space;
                else
                    formatted += numbersOnly.substring(i);
            myEditText.setText(formatted);
            myEditText.setSelection(myEditText.getText().toString().length());
        }
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

        @Override
        public void afterTextChanged(Editable e) {}
});

si vous voulez regrouper visuellement les nombres, mais vous ne voulez pas modifier la valeur de la EditText ajouter des tirets, vous pouvez utiliser cette Span approche:

EditText editText = findViewById(R.id.editText);
editText.addTextChangedListener(new TextWatcher() {
    @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 editable) {
        Object[] paddingSpans = editable.getSpans(0, editable.length(), DashSpan.class);
        for (Object span : paddingSpans) {
            editable.removeSpan(span);
        }

        addSpans(editable);
    }

    private static final int GROUP_SIZE = 4;

    private void addSpans(Editable editable) {

        final int length = editable.length();
        for (int i = 1; i * (GROUP_SIZE) < length; i++) {
            int index = i * GROUP_SIZE;
            editable.setSpan(new DashSpan(), index - 1, index,
                    Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
    }
});

où la classe DashSpan ressemble à ceci:

/**
 * A {@link ReplacementSpan} used for spacing in {@link android.widget.EditText}
 * to space things out. Adds '-'s
 */
public class DashSpan extends ReplacementSpan {

    @Override
    public int getSize(@NonNull Paint paint, CharSequence text, int start, int end, FontMetricsInt fm) {
        float padding = paint.measureText("-", 0, 1);
        float textSize = paint.measureText(text, start, end);
        return (int) (padding + textSize);
    }

    @Override
    public void draw(@NonNull Canvas canvas, CharSequence text, int start, int end, float x, int top, int y,
                     int bottom, @NonNull Paint paint) {
        canvas.drawText(text.subSequence(start, end) + "-", x, y, paint);
    }
}

de cette façon, vous aurez visuellement le groupement en utilisant les tirets, mais le getText() retournera le texte sans aucun groupement.

à vous pouvez ajouter les attributs android:digits="0123456789" et android:inputType="number" au EditText .

cette solution est basée sur le code de cette" bibliothèque 1519210920".