how to get which character is get deleted on backspace in android

Question

I am working with android 2.2.

How to know which character is get deleted on backspace when editing text in custom auto complete in android.

public boolean onKeyUp(int keyCode,KeyEvent msg){  
     if(keyCode == KeyEvent.KEYCODE_DEL)
     {
        // how to find here which character is get deleted
     }
     return false;
}

Bobs · Accepted Answer · 2013-01-05T07:51:13.723

2

String prevText = "";
public boolean onKeyUp(int keyCode,KeyEvent msg){  

     if(keyCode == KeyEvent.KEYCODE_DEL)
     {
        int pos = myEditText.getSelectionStart();
        char c = prevText.charAt(pos);
        // c is deleted
     }
     prevText = myEditText.getText.toString();
     return false;
}

edited Jan 05 '13 at 07:51

answered Jan 05 '13 at 07:45

Bobs

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one more query for this ques. How to find color code of character which is get deleted on backspace. – Smily Jan 07 '13 at 10:56

score 1 · Answer 2 · answered Jan 05 '13 at 07:35

1

You can use add a TextWatcher to AutoCompleteTextView with addTextChangeListener(TextWatcher).

You don't need to listen to onKeyUp() the various TextWatcher methods inform you if the user is adding or removing text.

answered Jan 05 '13 at 07:35

Sam

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score 1 · Answer 3 · answered Jan 05 '13 at 07:36

The easiest way is just keep last character that you type

int lastKeyCode;
public boolean onKeyUp(int keyCode,KeyEvent msg){  
     if(keyCode == KeyEvent.KEYCODE_DEL)
     {
        // print lastKeyCode here
        // how to find here which character is get deleted
     }
     lastKeyCode = keyCode;
     return false;
}

score 1 · Answer 4 · answered Mar 14 '18 at 10:19

Try this, working for me

editText.addTextChangedListener(new TextWatcher() {
        String initialChar = null;
        int initCursorPosition = 0;

        @Override
        public void onTextChanged(CharSequence charSequence, int start, int before, int after) {
                char addedChar = 0;

                int finalCursorPosition = editText.getSelectionStart();
                if (finalCursorPosition - initCursorPosition > 0) {
                    addedChar = charSequence.charAt(finalCursorPosition - 1);
                    Log.d(TAG, "onTextChanged added: " + addedChar);
                   //added char

                } else {
                    char delChar = initialChar.charAt(initCursorPosition - 1);
                   Log.d(TAG, "onTextChanged deletedChar: " + delChar);
                   //deleted char
                }

        }

        @Override
        public void beforeTextChanged(CharSequence charSequence, int start, int before, int after) {
            Log.d(TAG, "textChange beforeTextChanged: " + charSequence);
            Log.d(TAG, "textChange cursorPosition: " + editText.getSelectionStart());
            initialChar = String.valueOf(charSequence);
            initCursorPosition = editText.getSelectionStart();
        }

        @Override
        public void afterTextChanged(Editable arg0) {
        }
    });

score 0 · Answer 5 · edited Jan 07 '13 at 11:39

(Edittext).setOnKeyListener(new OnKeyListener()
{
    public boolean onKey(View v, int keyCode, KeyEvent event)
        {
            if(event.getKeyCode()==67)
            {
                if((EditText).getText().toString().length()>0)
                {
                               int pos = (Edittext).getSelectionStart();
                               Char c = (EditText).getText().toString.charAt(pos);
       Toast.makeText(getApplicationontext(),String.valueOf(c),Toast.LENGTH_SHORT).show();
                }
        }   
            return false;
        }
    });

I think it helps you

score -2 · Answer 6 · edited Jan 05 '13 at 08:01

-2

Try this

edittext.addTextChangeListener(new TextWatcher{
@override
  public void afterTextChanged(Editable s){
     String changedtext = s.toString();
}

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

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

edited Jan 05 '13 at 08:01

Ronak Mehta

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answered Jan 05 '13 at 07:51

techieWings

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The reason of down vote is you have added correct listeners but not completely answered the question e.g where ru u doing deletion or checking deletion . – Naveed Aug 03 '13 at 02:57
Answer is just to let person know that, he can use this to achieve his requirements. – techieWings Aug 23 '13 at 13:07

how to get which character is get deleted on backspace in android

6 Answers6