Android App - 即時判斷 Edittext 的內容

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EditText textInput = (EditText) findViewById(R.id.editText4);
textInput .addTextChangedListener(new TextWatcher() {
    public void afterTextChanged(Editable s) {
        if(s.toString().equals("test")) {                   
        }
    }
    public void beforeTextChanged(CharSequence s, int start, int count, int after){
    }
    public void onTextChanged(CharSequence s, int start, int before, int count)  {
    }
});