Android之怎样设置文本改变监听

文本改变监听：

username为EditText的一个对象

username.addTextChangedListener(new TextWatcher() {

@Override

public void onTextChanged(CharSequence s, int start, int before, int count) {

//參数依次代表的意思：s文本内容，start从第几个字符開始改变，before(自己能够測试一下。我没測试)，count改变的字符个数

// TODO Auto-generated method stub

Log.i("editText", s.toString());

}

@Override

public void beforeTextChanged(CharSequence s, int start, int count,

int after) {

// TODO Auto-generated method stub

Log.i("editText beforeTextChanged", s.toString());

}

@Override

public void afterTextChanged(Editable s) {

Log.i("editText  afterTextChanged", s.toString());

// TODO Auto-generated method stub

}

});