Custom format edit text input android to accept credit card number

Question

how to make edit text accept input in format

4digitnumber-4dignumber-4dignumber-4dignumber   

The code

text.addTextChangedListener(new TextWatcher() {
    int len = 0;
    String string ;
    @Override

    public void afterTextChanged(Editable s) {

        text.setOnKeyListener(new OnKeyListener()
        {   public boolean onKey(View v, int keyCode, KeyEvent event)
            {              
                    if (keyCode == KeyEvent.KEYCODE_DEL)
                    {

                    }
                    else{

                        string = text.getText().toString();
                        len = string.length()+1;
                        if(len%5==0){text.append("-");}

             }

                return false;      }   });
    }
});

works fine upon adding, but deleting or editing causes problem.

Answer 1

Now this works fine for soft/hard keyboard for all delete/edit ops. tx 4 ur help..

package com.and;

import android.app.Activity;
import android.app.AlertDialog;
import android.inputmethodservice.KeyboardView;
import android.os.Bundle;
import android.telephony.PhoneNumberFormattingTextWatcher;
import android.text.Editable;
import android.text.Selection;
import android.text.Spannable;
import android.text.TextWatcher;
import android.text.format.Formatter;
import android.text.method.NumberKeyListener;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.EditText;
import android.widget.Toast;

public class ccformat extends Activity {

    String a;
    int keyDel;

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

        final EditText text = (EditText) findViewById(com.and.R.id.editText1);

        text.addTextChangedListener(new TextWatcher() {

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

                boolean flag = true;
                String eachBlock[] = text.getText().toString().split("-");
                for (int i = 0; i < eachBlock.length; i++) {
                    if (eachBlock[i].length() > 4) {
                        flag = false;
                    }
                }
                if (flag) {

                    text.setOnKeyListener(new OnKeyListener() {

                        @Override
                        public boolean onKey(View v, int keyCode, KeyEvent event) {

                            if (keyCode == KeyEvent.KEYCODE_DEL)
                                keyDel = 1;
                            return false;
                        }
                    });

                    if (keyDel == 0) {

                        if (((text.getText().length() + 1) % 5) == 0) {

                            if (text.getText().toString().split("-").length <= 3) {
                                text.setText(text.getText() + "-");
                                text.setSelection(text.getText().length());
                            }
                        }
                        a = text.getText().toString();
                    } else {
                        a = text.getText().toString();
                        keyDel = 0;
                    }

                } else {
                    text.setText(a);
                }

            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {
                // TODO Auto-generated method stub

            }

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