Error
1 StackOverflow because of EditText's addTextChangedLister
1.1 Problem
We should be carefull when we use addTextChangedLister. Because if we don't add restrictions on text changging, we may have somes trouble that the method would be a endless loop.
afterTextChanged() –> setText() –> afterTextChanged() –> ….
css
1.2 Solution
Not change the EditText's content in addTextChangedLister().
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