How to Prevent an Infinite Loop When Clearing EditText Fields in Android?

Android EditText: Listening for Text Changes and Emptying Other Field

To ensure that only one of two fields contains data, it becomes imperative to clear the other field if one is modified. This need arises in situations where field1 and field2, two EditText fields, should not both hold values simultaneously.

As presented in the question, attaching a TextWatcher to both field1 and field2 causes an infinite loop where the fields clear each other indefinitely.

Solution:

To resolve this issue, implement a check to only clear the opposing field when the current field contains text. This can be achieved by examining the length of the input string.

In the modified code below, an "if" statement checks whether the length of the input string (i.e., the text entered into the current field) is different than 0. If so, the opposing field is cleared:

field1.addTextChangedListener(new TextWatcher() {

    @Override
    public void afterTextChanged(Editable s) {}

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

    @Override
    public void onTextChanged(CharSequence s, int start,
        int before, int count) {
        if(s.length() != 0)
            field2.setText("");
    }
});

field2.addTextChangedListener(new TextWatcher() {

    @Override
    public void afterTextChanged(Editable s) {}

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

    @Override
    public void onTextChanged(CharSequence s, int start,
        int before, int count) {
        if(s.length() != 0)
            field1.setText("");
    }
});

By incorporating this check, the infinite loop is broken, and the desired functionality is achieved, ensuring that only one of the fields ever contains data at any given time.

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