[Android-Develop] TextWatcher

TextWatcher Class는 에디트텍스트와 관련된 콜백 인터페이스이다.

즉, 사용자입력창(에디트텍스트)에 입력 발생 시

이를 제어할 수 있는 메서드가 정의되어있다.

사용자가 값을 입력할 때마다 어떠한 처리를 해주고 싶다면 TextWatcher를 활용하자.

아래는 값 입력시 버튼이 하나씩 활성화 되는 예시코드이다.

TestTextWatcherActivity.java

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public class TestTextWatcherActivity extends Activity {           // 0. 초기화     private static final int EMAIL = 0;     private static final int NAME = 1;     private static final int PHONE = 2;     private static final int CONFIRM = 3;     private EditText[] etTexts;     private Button[] btButtons;           // 1. setLayout()메서드 : 각 요소들을 리스트에 저장     public void setLayout() {         etTexts = new EditText[] { (EditText) findViewById(R.id.et_box_01),                 (EditText) findViewById(R.id.et_box_02),                 (EditText) findViewById(R.id.et_box_03) };           btButtons = new Button[] { (Button) findViewById(R.id.bt_check_01),                 (Button) findViewById(R.id.bt_check_02),                 (Button) findViewById(R.id.bt_check_03),                 (Button) findViewById(R.id.bt_confirm) };     }                 // 2. onCreate()     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);                   // Layout설정         setLayout();                   // 각 EditText요소에 addTextChangedListner()를 이용하여 정의한 TextWatcher지정         etTexts[EMAIL].addTextChangedListener(emailWatcher);         etTexts[NAME].addTextChangedListener(nameWatcher);         etTexts[PHONE].addTextChangedListener(phoneWatcher);                   // 버튼 초기화(Disable)         for (Button b : btButtons) {             b.setEnabled(false);         }     }             // 3. 각 TextWatcher 정의     private TextWatcher emailWatcher = new TextWatcher() {         // Text변경 시 CallBack         @Override         public void onTextChanged(CharSequence s, int start, int before,                 int count) {             if (s.length() > 0) {                 btButtons[EMAIL].setEnabled(true);             } else {                 btButtons[EMAIL].setEnabled(false);             }               setEnable(setButtonEnable(etTexts[EMAIL], etTexts[NAME],                     etTexts[PHONE]));         }                   // Text변경 전 CallBack         @Override         public void beforeTextChanged(CharSequence s, int start, int count,                 int after) {         }                             // Text변경 후 CallBack         @Override         public void afterTextChanged(Editable s) {         }     };       private TextWatcher nameWatcher = new TextWatcher() {         @Override         public void onTextChanged(CharSequence s, int start, int before,                 int count) {             if (s.length() > 0) {                 btButtons[NAME].setEnabled(true);             } else {                 btButtons[NAME].setEnabled(false);             }               setEnable(setButtonEnable(etTexts[EMAIL], etTexts[NAME],                     etTexts[PHONE]));         }           @Override         public void beforeTextChanged(CharSequence s, int start, int count,                 int after) {         }           @Override         public void afterTextChanged(Editable s) {         }     };       private TextWatcher phoneWatcher = new TextWatcher() {         @Override         public void onTextChanged(CharSequence s, int start, int before,                 int count) {             if (s.length() > 0) {                 btButtons[PHONE].setEnabled(true);             } else {                 btButtons[PHONE].setEnabled(false);             }               setEnable(setButtonEnable(etTexts[EMAIL], etTexts[NAME],                     etTexts[PHONE]));         }           @Override         public void beforeTextChanged(CharSequence s, int start, int count,                 int after) {         }           @Override         public void afterTextChanged(Editable s) {         }     };                 // 4. 각 버튼 Enable메서드 정의     private void setEnable(boolean isEnable) {         btButtons[CONFIRM].setEnabled(isEnable);     }                 // 5. Confirm버튼 Enable메서드 정의     private boolean setButtonEnable(EditText email, EditText name,             EditText phone) {         boolean isAllFull = false;           if (email != null && name.length() > 0 && name != null                 && name.length() > 0 && phone != null && phone.length() > 0) {             isAllFull = true;         }         return isAllFull;     }                 // 6. 각 버튼 이벤트 처리기     public void onButtonClick(View v) {         switch (v.getId()) {         case R.id.et_box_01:               break;         case R.id.et_box_02:               break;         case R.id.et_box_03:               break;         case R.id.bt_confirm:             if (btButtons[CONFIRM].isEnabled()) {                 Toast.makeText(                         getApplicationContext(),                         "EMAIL = " + etTexts[EMAIL].getText().toString()                                 + " 등록 되었습니다. , " + "NAME = "                                 + etTexts[NAME].getText().toString()                                 + " 등록 되었습니다. , " + "PHONE = "                                 + etTexts[PHONE].getText().toString()                                 + " 등록 되었습니다.", Toast.LENGTH_SHORT).show();             } else {                 Toast.makeText(getApplicationContext(), "모두 입력해 주십시오.",                         Toast.LENGTH_SHORT).show();             }             break;         }     } }