How to get the View in TextWatcher method context?

Question

I have a handler that is a TextWatcher and i dont know how to get the View that has changed text.

Here is my handler:

TextWatcher handler = new TextWatcher() {

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

    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        oldText = s.toString();
    }

    @Override
    public void afterTextChanged(Editable s) {
        //v.setText("afterTextChanged");
    }
};

Note the commented part, that is what i want, to get the View from the EditText that has triggered the event, to change the text after the text was changed.

How i can reach this .setText() method inside the afterTextChanged event? (Like onClick event that view is v)

I can not really understand that. But i got the "idea", can you post a answer containing a example class that i can implement containing this `View v`? — Paulo Roberto Rosa, Apr 04 '14 at 15:00

Ion Aalbers · Accepted Answer · 2014-04-06T13:50:48.017

28

public static class MyTextWatcher implements TextWatcher {

    private EditText mEditText;

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

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        oldText = mEditText.toString();
    }
    ....
}

Add it with:

    mFirstEditText.addTextChangedListener(new MyTextWatcher(mFirstEditText));

edited Apr 06 '14 at 13:50

answered Apr 04 '14 at 15:02

Ion Aalbers

7,830
3
37
50

2

`TextFormatter` should'nt be `MyTextWatcher`? – Paulo Roberto Rosa Apr 04 '14 at 16:47
It worked! But i needed to change `TextFormatter` to `MyTextWatcher` to compile it. – Paulo Roberto Rosa Apr 04 '14 at 18:46
Is this considered "leak"? There's some recommendation about not passing `Context` around, and I think passing `EditText`,... is indirectly passing `Context`, since we can call `getContext()` easily. – Minh Nghĩa Jun 17 '20 at 04:54
@MinhNghĩa TextWatcher belongs to the UI, so passing context to it is not a leak. – Waldmann Mar 24 '23 at 06:36

score 1 · Answer 2 · answered May 28 '21 at 12:59

1

a kotlin version of @Ion Aalbers answer

abstract class TextWatcherWithView(val view: TextInputEditText) : TextWatcher

answered May 28 '21 at 12:59

Anis

73
8

How to get the View in TextWatcher method context?

2 Answers2

Linked