尝试从 SQLite DB 设置 checkedtextview 时出错

Question

I'm trying to get my checkedTextView state from my SQLite database but it is crashing the app.

Here is the code implemented:

 Cursor c = db.rawQuery("SELECT * FROM list", null);
 int foundIndex = c.getColumnIndex("found");
 while (c != null) {
      c.getString(foundIndex);
      c.moveToNext();
 }
 String[] foundList = new String[foundIndex];
 arrayAdapter.notifyDataSetChanged();

 for (String found : levelOneListList){
      if (levelOneListList == foundList){
          levelOneListView.setItemChecked(found.indexOf(foundIndex), true);
      }
 }
}

And it is giving this error:

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.woodlandwanderer/com.example.woodlandwanderer.levelOneActivity}: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 0

Answer 1

As the error suggests, your cursor size is 0 and you are trying to access first.

add the following check before your loop.

if (c.moveToNext() && c.getCount()>0) {

Answer 2

Read your cursor data like this. Looks like your cursor size is 0.

    if (c != null && c.moveToFirst()){
        do {

           int foundIndex = c.getColumnIndex("found");
           c.getString(foundIndex);

        } while (c.moveToNext());

      c.close(); // close your db cursor
    }

// list update and set checkbox value here