Null 포인트가 뜨는 이유가 뭔지 모르겠네요...

Question

log 입니다.
11-06 11:02:28.460: E/AndroidRuntime(13747): FATAL EXCEPTION: main
11-06 11:02:28.460: E/AndroidRuntime(13747): java.lang.NullPointerException
11-06 11:02:28.460: E/AndroidRuntime(13747):  at com.example.excelex.MainActivity.getData(MainActivity.java:293)
11-06 11:02:28.460: E/AndroidRuntime(13747):  at com.example.excelex.MainActivity$2.onClick(MainActivity.java:80)
11-06 11:02:28.460: E/AndroidRuntime(13747):  at android.view.View.performClick(View.java:4223)
11-06 11:02:28.460: E/AndroidRuntime(13747):  at android.view.View$PerformClick.run(View.java:17275)
11-06 11:02:28.460: E/AndroidRuntime(13747):  at android.os.Handler.handleCallback(Handler.java:615)
11-06 11:02:28.460: E/AndroidRuntime(13747):  at android.os.Handler.dispatchMessage(Handler.java:92)
11-06 11:02:28.460: E/AndroidRuntime(13747):  at android.os.Looper.loop(Looper.java:137)
11-06 11:02:28.460: E/AndroidRuntime(13747):  at android.app.ActivityThread.main(ActivityThread.java:4946)
11-06 11:02:28.460: E/AndroidRuntime(13747):  at java.lang.reflect.Method.invokeNative(Native Method)
11-06 11:02:28.460: E/AndroidRuntime(13747):  at java.lang.reflect.Method.invoke(Method.java:511)
11-06 11:02:28.460: E/AndroidRuntime(13747):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1036)
11-06 11:02:28.460: E/AndroidRuntime(13747):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:803)
11-06 11:02:28.460: E/AndroidRuntime(13747):  at dalvik.system.NativeStart.main(Native Method)


///////////////////////////////////////////////////////////////////////////

 
onCreate 메소드
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  view = (LinearLayout) inflater.inflate(R.layout.activity_main, null);

  editdate = (EditText) view.findViewById(R.id.date);
 
excelbtn = (Button) findViewById(R.id.excelbtn);
  excelbtn.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    MainActivity main = new MainActivity();
    try {
     excelWrite(MainActivity.this, "ExcelEx.xls", main.getData());
    } catch (WriteException e) {
     e.printStackTrace();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
  });
getData() 메소드
public List<Map<String, Object>> getData() {
  List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();
  Map<String, Object> map = new HashMap<String, Object>();
 
  a = editdate.getText().toString();
  Log.d("", "a : " + a);
  map.put("editdate", a);

 

Answer 1

main.getData() 호출 하셨는데 해당 main 변수는 현재 엑티비티를 new로 만드신거네요.

그러면 해당 main 변수에 있는 액티비티 클래스의 editdate 변수가 과연 초기화 되었을까요?

editdate가 null 입니다.

Comments

아...감사합니다. 거기까지 생각을 못했썻네요...