How append to textview & remove last letter from textview?

Question

I want to add text in textview in android, but when the backspace is pressed the last character should be removed.

I am using softkeyboard.
I am creating textview dynamically.
and update textview when key of soft-keyboard is dispatched/pressed.

This is my code:

@Override
public boolean dispatchKeyEvent(KeyEvent KEvent){
     keyaction = KEvent.getAction();

    if(keyaction == KeyEvent.ACTION_DOWN){
         keycode = KEvent.getKeyCode();
         keyunicode = KEvent.getUnicodeChar(KEvent.getMetaState() );
         character = (char) keyunicode;
        textView.setText(""+character);
    }
    return super.dispatchKeyEvent(KEvent);
}

Every time I press a key, textview is set with a new character and previous one gets overridden. Also if backspace is pressed than last character appended get deleted

Is there any way to do this to textview?

thanks saeed . but If we press backspace then character that we append most recently does not deleted from textview. — saksham agarwal, Feb 24 '16 at 11:08
what is your actual problem ... ... not deleted last character when you back pressed .. you want also delete that.? — saeed, Feb 24 '16 at 11:40

score 7 · Accepted Answer · edited May 23 '17 at 12:33

7

You can use

textView.append("" + character);

Or

textView.setText(textView.getText().toString() + character);

This is the doc for TextView.append()

It seems it may cause an extra padding in your TextView() as described (and fixed) by this question.

You may want to check it also.

UPDATE

To detect backspace:

You may want to add some security checks (like string length and different null etc)

if(keyaction == KeyEvent.ACTION_DOWN){
    if(keycode == KeyEvent.KEYCODE_DEL){
        // Remove last char from string (like backspace would do)
        textView.setText(textView.getText().toString().substring(0, textView.getText().length() - 1));
    } else {
        textView.append("" + character);
    }
}

edited May 23 '17 at 12:33

Community

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answered Feb 24 '16 at 11:00

guipivoto

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thanks . but If we press backspace then character that we append most recently does not deleted from textview. – saksham agarwal Feb 24 '16 at 11:08
@sakshamagarwal I suggest you debug your app, but seems that you are trying to append the backspace character – guisantogui Feb 24 '16 at 11:12
@sakshamagarwal I upadted the answer... let me know if it works. – guipivoto Feb 24 '16 at 11:12
@sakshamagarwal I updated again. I tested and it works. KEYCODE_DEL =67. After input that event, string is deleted. – guipivoto Feb 24 '16 at 11:37
@sakshamagarwal Are you using a soft keyboard? Maybe, that's why is not working... check this question: http://stackoverflow.com/questions/4886858/android-edittext-deletebackspace-key-event – guipivoto Feb 24 '16 at 11:52
I am using soft keyboard but thanks it is working now...!! – saksham agarwal Feb 24 '16 at 11:54
Great... Good to hear – guipivoto Feb 24 '16 at 11:55

How append to textview & remove last letter from textview?

1 Answers1