notifyDataSetChanged();가 작동을 안합니다.

Question

리스트뷰 목록에서 지운후에 notifyDataSetChanged();를 사용해서 갱신을 하려고 하는데 화면에서 지워졌다가 뒤로가기 후에 다시 들어가면 다시 원래대로 돌아와버리는데 notifyDataSetChanged();가 작동을 안해서 그런것 같습니다ㅠ runOnUiThread? 같은거도 써봤는데 여전히 안돼요 ㅠ SQLite쓰고있습니다

?

DBHelper helper = new DBHelper(getApplicationContext(), "movie.db", null, 1);         SQLiteDatabase db = helper.getWritableDatabase();         helper.onCreate(db);               likelist = (ListView) findViewById(R.id.likeListView);             like = new ArrayList<>();         final TextView userName = (TextView) findViewById(R.id.userName);         arrAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_single_choice, like);         likelist.setAdapter(arrAdapter);   final Cursor c = db.query("like", null, null, null, null, null, null, null);         while(c.moveToNext()) {             arrAdapter.add(c.getString(c.getColumnIndex("title")));         }             likelist.setOnItemClickListener(new AdapterView.OnItemClickListener() {                                             @Override                                             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                                                 final int count;                                                 final int[] checked = new int[1];                                                 count = arrAdapter.getCount();                                                   new AlertDialog.Builder(ProfileActivity.this)                                                         .setTitle("취소").setMessage("삭제")                                                           .setPositiveButton("삭제", new DialogInterface.OnClickListener() {                                                             public void onClick(DialogInterface dialog, int whichButton) {                                                                 if (count > 0) {                                                                     // 현재 선택된 아이템의 position 획득.                                                                     checked[0] = likelist.getCheckedItemPosition();                                                                       if (checked[0] > -1 && checked[0] < count) {                                                                           new Thread(new Runnable() {                                                                             @Override                                                                             public void run() {                                                                                 runOnUiThread(new Runnable() {                                                                                     @Override                                                                                     public void run() {                                                                                         c.moveToPosition(checked[0]);                                                                                         // 아이템 삭제                                                                                         like.remove(c.getString(c.getColumnIndex("title")));                                                                                           // listview 선택 초기화.                                                                                         likelist.clearChoices();                                                                                           // listview 갱신.                                                                                         arrAdapter.notifyDataSetChanged();                                                                                     }                                                                                 });                                                                             }                                                                         }).start();                                                                     }                                                                 }                                                             }                                                         })                                                           .setNegativeButton("취소", new DialogInterface.OnClickListener() {                                                             public void onClick(DialogInterface dialog, int whichButton) {                                                               }                                                         })                                                         .show();                                               }                                         });

reference 문제라고 하던데 잘 모르겠습니다 ㅠ

Answer 1

activity에 재진입 할때마다 DB에서 다시 읽어들이는거 같은데,

뒤로 갔다가 다시 들어왔을때 변경사항이 유지되길 원하신다면,

item삭제시 DB도 업데이트 해야하지 않을까요?

Comments

arrAdapter대신 like를 써서
like.remove(c.getString(c.getColumnIndex("title")));를 해도 안돼서
like.notifyDataSetChanged(); 등등 해봤는데 마찬가지라 뭘 잘못한걸까요..