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) {             }         });     } }