[Android] EditText , 空字串判斷&OnTextChangeListener

OnChangeListener

myEditText.addTextChangedListener(new TextWatcher() {

    @Override

    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

 

    }

 

    @Override

    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

 

    }

 

    @Override

    public void afterTextChanged(Editable editable) {

        if (myEditText.getText().length() > 0){

            // Typing

        }

        else {

            // Not typing

        }

    }

});

空字串判斷

if("".equals(mEditText.getText().toString().trim())){
    //edittext輸入為空白或無輸入
}else{
    //edittext有輸入
}

取得FOCUS

requestFocus();